COVER INFORMATION Station: VLBA_FD (Code Fd ) Experiment: SNR/OH(1720 MHz) Masers Toward W44 Exp. Code: BH102H Schedule Version: 2.00 Processed by SCHED version: Release of 02 July 2002 PI: Ian Hoffman Address: National Radio Astronomy Observatory P. O. Box O Socorro, New Mexico, 87801 U.S.A. Phone: 505 835 7093 EMAIL: ihoffman@aoc.nrao.edu Fax: 505 835 7027 Phone during observation: 505 835 7093 Observing mode: 18 cm VLBA non-standard correlator setup Notes: Main science run toward W44 OH 1720 masers 4 baseband channels The fringe finder is 3C345=J1642+3948 High output data rate allowed by TAC Schedule for VLBA_FD (Code Fd ) Page 2 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- Next scan frequencies: 1720.24 1720.24 1720.17 1720.17 1719.17 1719.17 1718.17 1718.17 Next BBC frequencies: 679.76 679.76 679.83 679.83 680.83 680.83 681.83 681.83 Next scan bandwidths: 0.06 0.06 1.00 1.00 1.00 1.00 1.00 1.00 01 30 00 3C286 16 18 16 54.3 280.8 2.8 78.8 0 1 1 0 01 30 00 01 35 00 --- 16 23 17 53.2 281.1 2.9 78.5 300 F 1 1000 01 38 51 J1751+0939 16 27 08 61.2 132.4 -1.4 -40.2 125 1 1 1000 01 38 51 01 43 31 --- 16 31 49 62.0 134.2 -1.3 -38.7 280 F 1 1933 01 46 09 3C345 16 34 27 80.7 10.3 -0.1 -168.5 69 1 1 1933 01 46 09 01 51 09 --- 16 39 28 80.8 4.4 -0.1 -175.1 300 F 1 2933 01 51 09 W44DF 16 39 28 46.3 125.3 -2.3 -44.6 -87 1 1 2933 01 51 09 01 54 09 --- 16 42 29 46.8 126.1 -2.2 -44.1 93 F 1 3533 01 54 09 J1838+0404 16 42 29 51.8 128.3 -1.9 -42.6 -16 1 1 3533 01 54 09 01 56 09 =J1838+04 16 44 29 52.1 128.9 -1.9 -42.2 104 F 1 3933 01 56 09 W44BC 16 44 29 47.1 127.0 -2.2 -43.4 -16 1 1 3933 01 56 09 01 59 09 --- 16 47 30 47.6 127.8 -2.1 -42.8 164 F 1 4533 01 59 09 J1838+0404 16 47 30 52.6 129.8 -1.9 -41.5 -16 1 1 4533 01 59 09 02 01 09 =J1838+04 16 49 30 53.0 130.4 -1.8 -41.1 104 F 1 4933 02 01 09 W44DF 16 49 30 48.0 128.0 -2.1 -42.7 -16 1 1 4933 02 01 09 02 04 09 --- 16 52 30 48.5 128.8 -2.1 -42.1 164 F 1 5533 02 04 09 J1838+0404 16 52 30 53.5 131.3 -1.8 -40.4 -16 1 1 5533 02 04 09 02 06 09 =J1838+04 16 54 31 53.8 132.0 -1.7 -39.9 104 F 1 5933 02 06 09 W44BC 16 54 31 48.8 129.8 -2.0 -41.4 -16 1 1 5933 02 06 09 02 09 09 --- 16 57 31 49.3 130.6 -2.0 -40.8 164 F 1 6533 02 09 09 J1838+0404 16 57 31 54.3 133.0 -1.7 -39.1 -16 1 1 6533 02 09 09 02 11 09 =J1838+04 16 59 32 54.6 133.6 -1.7 -38.6 104 F 1 6933 02 11 09 W44DF 16 59 32 49.7 130.8 -2.0 -40.6 -16 1 1 6933 02 11 09 02 14 09 --- 17 02 32 50.2 131.7 -1.9 -40.0 164 F 1 7533 Schedule for VLBA_FD (Code Fd ) Page 3 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 02 14 09 J1838+0404 17 02 32 55.0 134.7 -1.6 -37.8 -16 1 1 7533 02 14 09 02 16 09 =J1838+04 17 04 32 55.3 135.4 -1.6 -37.3 104 F 1 7933 02 16 09 W44BC 17 04 32 50.4 132.7 -1.9 -39.2 -16 1 1 7933 02 16 09 02 19 09 --- 17 07 33 50.9 133.7 -1.8 -38.5 164 F 1 8533 02 19 09 J1838+0404 17 07 33 55.8 136.4 -1.5 -36.5 -16 1 1 8533 02 19 09 02 21 09 =J1838+04 17 09 33 56.1 137.1 -1.5 -35.9 104 F 1 8933 02 21 09 W44DF 17 09 33 51.3 133.9 -1.8 -38.3 -16 1 1 8933 02 21 09 02 24 09 --- 17 12 34 51.8 134.8 -1.7 -37.6 164 F 1 9533 02 24 09 J1838+0404 17 12 34 56.5 138.2 -1.4 -35.1 -16 1 1 9533 02 24 09 02 26 09 =J1838+04 17 14 34 56.8 139.0 -1.4 -34.5 104 F 1 9933 02 26 09 W44BC 17 14 34 52.0 135.9 -1.7 -36.8 -16 1 1 9933 02 26 09 02 29 09 --- 17 17 34 52.4 136.9 -1.6 -36.0 164 F 1 10533 02 29 09 J1838+0404 17 17 34 57.2 140.1 -1.4 -33.6 -16 1 1 10533 02 29 09 02 31 09 =J1838+04 17 19 35 57.5 140.9 -1.3 -33.0 104 F 1 10933 02 34 57 3C286 17 23 24 40.6 285.6 3.9 74.1 126 1 1 10933 02 34 57 02 39 57 --- 17 28 25 39.6 286.0 4.0 73.7 300 F 1 11933 02 42 06 3C345 17 30 34 76.7 316.7 0.8 129.8 48 1 1 11933 02 42 06 02 47 06 --- 17 35 35 75.9 314.2 0.9 126.6 300 F 1 12933 02 50 59 J1751+0939 17 39 29 68.8 171.6 -0.2 -7.3 132 1 1 12933 02 50 59 02 55 39 --- 17 44 10 68.9 174.8 -0.1 -4.5 280 F 1 13867 02 55 39 W44DF 17 44 10 56.1 146.1 -1.2 -28.7 -32 1 1 13867 02 55 39 02 58 39 --- 17 47 10 56.5 147.3 -1.2 -27.7 148 F 1 14467 02 58 39 J1838+0404 17 47 10 60.8 152.7 -0.9 -23.3 -15 1 1 14467 02 58 39 03 00 39 =J1838+04 17 49 11 61.0 153.7 -0.8 -22.5 105 F 1 14867 03 00 39 W44BC 17 49 11 56.5 148.5 -1.1 -26.7 -15 1 1 14867 03 00 39 03 03 39 --- 17 52 11 56.9 149.7 -1.1 -25.7 165 F 1 15467 03 03 39 J1838+0404 17 52 11 61.2 155.1 -0.8 -21.3 -15 1 1 15467 03 03 39 03 05 39 =J1838+04 17 54 11 61.4 156.1 -0.7 -20.4 105 F 1 15867 Schedule for VLBA_FD (Code Fd ) Page 4 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 03 05 39 W44DF 17 54 11 57.2 150.1 -1.0 -25.4 -14 1 1 15867 03 05 39 03 08 39 --- 17 57 12 57.6 151.4 -1.0 -24.3 166 F 1 16467 03 08 39 J1838+0404 17 57 12 61.7 157.6 -0.7 -19.2 -14 1 1 16467 03 08 39 03 10 39 =J1838+04 17 59 12 61.8 158.6 -0.7 -18.4 106 F 1 16867 03 10 39 W44BC 17 59 12 57.6 152.7 -1.0 -23.3 -14 1 1 16867 03 10 39 03 13 39 --- 18 02 13 57.9 154.0 -0.9 -22.2 166 F 1 17467 03 13 39 J1838+0404 18 02 13 62.1 160.1 -0.6 -17.1 -14 1 2 17467 03 13 39 03 15 39 =J1838+04 18 04 13 62.2 161.1 -0.6 -16.2 106 R 1 17067 03 15 39 W44DF 18 04 13 58.2 154.4 -0.9 -21.8 -14 1 2 17067 03 15 39 03 18 39 --- 18 07 14 58.5 155.8 -0.8 -20.7 166 R 1 16467 03 18 39 J1838+0404 18 07 14 62.4 162.7 -0.5 -14.9 -14 1 2 16467 03 18 39 03 20 39 =J1838+04 18 09 14 62.5 163.7 -0.5 -14.0 106 R 1 16067 03 20 39 W44BC 18 09 14 58.5 157.1 -0.8 -19.6 -14 1 2 16067 03 20 39 03 23 39 --- 18 12 14 58.8 158.4 -0.7 -18.4 166 R 1 15467 03 23 39 J1838+0404 18 12 14 62.7 165.3 -0.4 -12.6 -14 1 2 15467 03 23 39 03 25 39 =J1838+04 18 14 15 62.8 166.4 -0.4 -11.7 106 R 1 15067 03 25 39 W44DF 18 14 15 59.1 159.0 -0.7 -18.0 -13 1 2 15067 03 25 39 03 28 39 --- 18 17 15 59.3 160.4 -0.7 -16.8 167 R 1 14467 03 28 39 J1838+0404 18 17 15 63.0 168.0 -0.4 -10.3 -13 1 2 14467 03 28 39 03 30 39 =J1838+04 18 19 15 63.0 169.1 -0.3 -9.4 107 R 1 14067 03 30 39 W44BC 18 19 15 59.3 161.7 -0.6 -15.7 -14 1 2 14067 03 30 39 03 33 39 --- 18 22 16 59.5 163.1 -0.6 -14.5 166 R 1 13467 03 33 39 J1838+0404 18 22 16 63.2 170.7 -0.3 -8.0 -13 1 2 13467 03 33 39 03 35 39 =J1838+04 18 24 16 63.2 171.8 -0.2 -7.0 107 R 1 13067 03 35 39 W44DF 18 24 16 59.8 163.7 -0.5 -14.0 -13 1 2 13067 03 35 39 03 38 39 --- 18 27 17 60.0 165.2 -0.5 -12.7 167 R 1 12467 03 38 39 J1838+0404 18 27 17 63.3 173.5 -0.2 -5.6 -13 1 2 12467 03 38 39 03 40 39 =J1838+04 18 29 17 63.3 174.6 -0.2 -4.7 107 R 1 12067 Schedule for VLBA_FD (Code Fd ) Page 5 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 03 40 39 W44BC 18 29 17 59.9 166.5 -0.4 -11.6 -13 1 2 12067 03 40 39 03 43 39 --- 18 32 18 60.0 168.0 -0.4 -10.3 167 R 1 11467 03 43 39 J1838+0404 18 32 18 63.4 176.3 -0.1 -3.2 -13 1 2 11467 03 43 39 03 45 39 =J1838+04 18 34 18 63.4 177.4 -0.1 -2.3 107 R 1 11067 03 45 39 W44DF 18 34 18 60.3 168.6 -0.4 -9.8 -12 1 2 11067 03 45 39 03 48 39 --- 18 37 18 60.4 170.1 -0.3 -8.5 168 R 1 10467 03 48 39 J1838+0404 18 37 18 63.4 179.1 0.0 -0.8 -12 1 2 10467 03 48 39 03 50 39 =J1838+04 18 39 19 63.4 180.2 0.0 0.2 108 R 1 10067 03 50 39 W44BC 18 39 19 60.3 171.5 -0.3 -7.3 -12 1 2 10067 03 50 39 03 53 39 --- 18 42 19 60.4 173.0 -0.2 -6.1 168 R 1 9467 03 53 39 J1838+0404 18 42 19 63.4 181.9 0.1 1.6 -12 1 2 9467 03 53 39 03 55 39 =J1838+04 18 44 20 63.4 183.0 0.1 2.6 108 R 1 9067 03 56 35 J1751+0939 18 45 15 65.6 213.5 0.9 28.8 29 1 2 9067 03 55 39 04 01 15 --- 18 49 56 65.0 215.9 1.0 30.8 280 R 1 7949 04 01 15 W44DF 18 49 56 60.7 176.5 -0.1 -3.0 -32 1 2 7949 04 01 15 04 04 16 --- 18 52 57 60.8 178.1 -0.1 -1.7 149 R 1 7345 04 04 16 J1838+0404 18 52 57 63.2 187.8 0.2 6.7 -12 1 2 7345 04 04 16 04 06 16 =J1838+04 18 54 58 63.2 188.9 0.3 7.6 108 R 1 6945 04 06 16 W44BC 18 54 58 60.5 179.4 0.0 -0.5 -12 1 2 6945 04 06 16 04 09 17 --- 18 57 59 60.5 180.9 0.0 0.8 169 R 1 6342 04 09 17 J1838+0404 18 57 59 63.1 190.5 0.3 9.0 -12 1 2 6342 04 09 17 04 11 17 =J1838+04 19 00 00 63.0 191.6 0.3 10.0 108 R 1 5942 04 11 17 W44DF 19 00 00 60.8 181.7 0.1 1.4 -13 1 2 5942 04 11 17 04 14 18 --- 19 03 01 60.7 183.2 0.1 2.8 168 R 1 5339 04 14 18 J1838+0404 19 03 01 62.8 193.2 0.4 11.4 -13 1 2 5339 04 14 18 04 16 18 =J1838+04 19 05 01 62.7 194.3 0.4 12.3 107 R 1 4939 04 16 18 W44BC 19 05 01 60.5 184.5 0.1 3.8 -13 1 2 4939 04 16 18 04 19 19 --- 19 08 03 60.4 186.0 0.2 5.2 168 R 1 4335 Schedule for VLBA_FD (Code Fd ) Page 6 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 04 19 19 J1838+0404 19 08 03 62.6 195.9 0.5 13.7 -13 1 2 4335 04 19 19 04 21 19 =J1838+04 19 10 03 62.5 196.9 0.5 14.6 107 R 1 3935 04 21 19 W44DF 19 10 03 60.6 186.8 0.2 5.9 -13 1 2 3935 04 21 19 04 24 20 --- 19 13 05 60.5 188.3 0.3 7.2 168 R 1 3332 04 24 20 J1838+0404 19 13 05 62.3 198.5 0.6 15.9 -13 1 2 3332 04 24 20 04 26 20 =J1838+04 19 15 05 62.1 199.5 0.6 16.8 107 R 1 2932 04 26 20 W44BC 19 15 05 60.2 189.5 0.3 8.2 -13 1 2 2932 04 26 20 04 29 21 --- 19 18 07 60.1 191.0 0.4 9.5 168 R 1 2329 04 29 21 J1838+0404 19 18 07 61.9 201.1 0.7 18.1 -13 1 2 2329 04 29 21 04 31 21 =J1838+04 19 20 07 61.7 202.1 0.7 18.9 107 R 1 1929 04 31 21 W44DF 19 20 07 60.3 191.8 0.4 10.2 -13 1 2 1929 04 31 21 04 34 22 --- 19 23 08 60.1 193.3 0.4 11.5 168 R 1 1325 04 34 22 J1838+0404 19 23 08 61.5 203.6 0.7 20.2 -13 1 2 1325 04 34 22 04 36 22 =J1838+04 19 25 09 61.3 204.5 0.8 21.0 107 R 1 925 04 36 22 W44BC 19 25 09 59.8 194.5 0.5 12.4 -13 1 2 925 04 36 22 04 39 23 --- 19 28 10 59.6 195.9 0.5 13.7 168 R 1 322 04 39 23 J1838+0404 19 28 10 61.0 206.0 0.8 22.2 -13 1 1 322 04 39 23 04 41 23 =J1838+04 19 30 11 60.8 206.9 0.9 23.0 107 F 2 722 04 41 23 W44DF 19 30 11 59.7 196.8 0.6 14.4 -13 1 1 722 04 41 23 04 44 24 --- 19 33 12 59.5 198.2 0.6 15.6 168 F 2 1325 04 44 24 J1838+0404 19 33 12 60.5 208.4 0.9 24.2 -13 1 1 1325 04 44 24 04 46 24 =J1838+04 19 35 12 60.3 209.3 0.9 25.0 107 F 2 1725 04 46 24 W44BC 19 35 12 59.1 199.3 0.6 16.5 -13 1 1 1725 04 46 24 04 49 25 --- 19 38 14 58.9 200.7 0.7 17.7 168 F 2 2329 04 49 25 J1838+0404 19 38 14 60.0 210.7 1.0 26.1 -13 1 1 2329 04 49 25 04 51 25 =J1838+04 19 40 14 59.8 211.5 1.0 26.8 107 F 2 2729 04 51 25 W44DF 19 40 14 59.0 201.5 0.7 18.4 -13 1 1 2729 04 51 25 04 54 26 --- 19 43 16 58.8 202.9 0.8 19.6 168 F 2 3332 Schedule for VLBA_FD (Code Fd ) Page 7 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 04 54 26 J1838+0404 19 43 16 59.4 212.9 1.1 27.9 -13 1 1 3332 04 54 26 04 56 26 =J1838+04 19 45 16 59.2 213.7 1.1 28.6 107 F 2 3732 04 56 26 W44BC 19 45 16 58.3 203.9 0.8 20.4 -13 1 1 3732 04 56 26 04 59 27 --- 19 48 17 58.1 205.2 0.9 21.5 168 F 2 4335 04 59 27 J1838+0404 19 48 17 58.8 215.0 1.2 29.7 -13 1 1 4335 04 59 27 05 01 27 =J1838+04 19 50 18 58.6 215.8 1.2 30.3 107 F 2 4735 05 01 27 W44DF 19 50 18 58.1 206.0 0.9 22.2 -13 1 1 4735 05 01 27 05 04 28 --- 19 53 19 57.9 207.3 0.9 23.3 168 F 2 5339 05 04 28 J1838+0404 19 53 19 58.2 217.1 1.2 31.3 -12 1 1 5339 05 04 28 05 06 28 =J1838+04 19 55 20 57.9 217.9 1.3 32.0 108 F 2 5739 05 06 28 W44BC 19 55 20 57.4 208.2 1.0 24.0 -12 1 1 5739 05 06 28 05 09 29 --- 19 58 21 57.1 209.5 1.0 25.1 169 F 2 6342 05 09 29 J1838+0404 19 58 21 57.5 219.1 1.3 32.9 -12 1 1 6342 05 09 29 05 11 29 =J1838+04 20 00 21 57.2 219.8 1.4 33.6 108 F 2 6742 05 13 47 3C345 20 02 39 48.8 296.9 3.3 86.8 80 1 1 6742 05 13 47 05 18 47 --- 20 07 40 47.8 297.0 3.4 86.1 300 F 2 7742 05 20 26 J1751+0939 20 09 20 51.7 244.1 2.3 51.7 59 1 1 7742 05 20 26 05 25 06 --- 20 14 01 50.8 245.3 2.4 52.4 280 F 2 8675 05 25 06 W44DF 20 14 01 55.5 215.8 1.3 30.2 -26 1 1 8675 05 25 06 05 28 07 --- 20 17 03 55.1 216.9 1.3 31.1 155 F 2 9279 05 28 07 J1838+0404 20 17 03 54.8 225.9 1.6 38.3 -12 1 1 9279 05 28 07 05 30 07 =J1838+04 20 19 03 54.5 226.6 1.7 38.8 108 F 2 9679 05 30 07 W44BC 20 19 03 54.6 217.6 1.4 31.7 -12 1 1 9679 05 30 07 05 33 08 --- 20 22 05 54.2 218.7 1.4 32.6 169 F 2 10282 05 33 08 J1838+0404 20 22 05 54.0 227.6 1.7 39.5 -12 1 1 10282 05 33 08 05 35 08 =J1838+04 20 24 05 53.7 228.2 1.8 40.0 108 F 2 10682 05 35 08 W44DF 20 24 05 54.2 219.5 1.5 33.2 -12 1 1 10682 05 35 08 05 38 09 --- 20 27 06 53.8 220.5 1.5 34.0 169 F 2 11285 Schedule for VLBA_FD (Code Fd ) Page 8 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 05 38 09 J1838+0404 20 27 06 53.2 229.2 1.8 40.7 -12 1 1 11285 05 38 09 05 40 09 =J1838+04 20 29 07 52.9 229.8 1.8 41.2 108 F 2 11685 05 40 09 W44BC 20 29 07 53.2 221.2 1.5 34.5 -12 1 1 11685 05 40 09 05 43 10 --- 20 32 08 52.8 222.2 1.6 35.3 169 F 2 12289 05 43 10 J1838+0404 20 32 08 52.4 230.7 1.9 41.9 -12 1 1 12289 05 43 10 05 45 10 =J1838+04 20 34 09 52.0 231.3 1.9 42.3 108 F 2 12689 05 45 10 W44DF 20 34 09 52.8 223.0 1.6 35.9 -12 1 1 12689 05 45 10 05 48 11 --- 20 37 10 52.3 224.0 1.7 36.7 169 F 2 13292 05 48 11 J1838+0404 20 37 10 51.5 232.2 2.0 43.0 -12 1 1 13292 05 48 11 05 50 11 =J1838+04 20 39 10 51.2 232.8 2.0 43.4 108 F 2 13692 05 50 11 W44BC 20 39 10 51.8 224.5 1.7 37.1 -12 1 1 13692 05 50 11 05 53 12 --- 20 42 12 51.3 225.5 1.8 37.9 169 F 2 14295 05 53 12 J1838+0404 20 42 12 50.7 233.7 2.1 44.0 -11 1 1 14295 05 53 12 05 55 12 =J1838+04 20 44 12 50.3 234.2 2.1 44.4 109 F 2 14695 05 55 12 W44DF 20 44 12 51.3 226.2 1.8 38.4 -11 1 1 14695 05 55 12 05 58 13 --- 20 47 14 50.8 227.2 1.8 39.1 170 F 2 15299 05 58 13 J1838+0404 20 47 14 49.8 235.1 2.1 45.0 -11 1 1 15299 05 58 13 06 00 13 =J1838+04 20 49 14 49.4 235.6 2.2 45.4 109 F 2 15699 06 00 13 W44BC 20 49 14 50.2 227.7 1.9 39.5 -11 1 1 15699 06 00 13 06 03 14 --- 20 52 15 49.7 228.6 1.9 40.2 170 F 2 16302 06 03 14 J1838+0404 20 52 15 48.9 236.4 2.2 46.0 -11 1 1 16302 06 03 14 06 05 14 =J1838+04 20 54 16 48.5 237.0 2.3 46.3 109 F 2 16702 06 05 14 W44DF 20 54 16 49.7 229.3 2.0 40.7 -11 1 1 16702 06 05 14 06 08 15 --- 20 57 17 49.2 230.1 2.0 41.3 170 F 2 17305 06 08 15 J1838+0404 20 57 17 48.0 237.7 2.3 46.8 -11 1 2 17305 06 08 15 06 10 15 =J1838+04 20 59 18 47.6 238.2 2.3 47.2 109 R 2 16905 06 10 15 W44BC 20 59 18 48.6 230.6 2.1 41.7 -11 1 2 16905 06 10 15 06 13 16 --- 21 02 19 48.1 231.5 2.1 42.3 170 R 2 16302 Schedule for VLBA_FD (Code Fd ) Page 9 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 06 13 16 J1838+0404 21 02 19 47.1 239.0 2.4 47.7 -11 1 2 16302 06 13 16 06 15 16 =J1838+04 21 04 19 46.7 239.5 2.4 48.0 109 R 2 15902 06 15 16 W44DF 21 04 19 48.0 232.1 2.1 42.8 -11 1 2 15902 06 15 16 06 18 17 --- 21 07 21 47.5 232.9 2.2 43.4 170 R 2 15299 06 18 17 J1838+0404 21 07 21 46.1 240.2 2.5 48.5 -11 1 2 15299 06 18 17 06 20 17 =J1838+04 21 09 21 45.8 240.7 2.5 48.8 109 R 2 14899 06 20 17 W44BC 21 09 21 46.9 233.4 2.2 43.7 -11 1 2 14899 06 20 17 06 23 18 --- 21 12 23 46.3 234.2 2.3 44.2 170 R 2 14295 06 23 18 J1838+0404 21 12 23 45.2 241.4 2.6 49.2 -11 1 2 14295 06 23 18 06 25 18 =J1838+04 21 14 23 44.8 241.9 2.6 49.5 109 R 2 13895 06 25 18 W44DF 21 14 23 46.2 234.8 2.3 44.7 -11 1 2 13895 06 25 18 06 28 19 --- 21 17 25 45.7 235.5 2.3 45.2 170 R 2 13292 06 28 19 J1838+0404 21 17 25 44.2 242.5 2.6 49.9 -11 1 2 13292 06 28 19 06 30 19 =J1838+04 21 19 25 43.8 243.0 2.7 50.2 109 R 2 12892 06 30 19 W44BC 21 19 25 45.1 235.9 2.4 45.5 -11 1 2 12892 06 30 19 06 33 20 --- 21 22 26 44.5 236.7 2.4 46.0 170 R 2 12289 06 33 20 J1838+0404 21 22 26 43.3 243.6 2.7 50.6 -11 1 2 12289 06 33 20 06 35 20 =J1838+04 21 24 27 42.9 244.1 2.8 50.9 109 R 2 11889 06 35 59 J1751+0939 21 25 06 36.3 258.9 3.6 58.9 20 1 2 11889 06 35 20 06 40 39 --- 21 29 47 35.3 259.6 3.6 59.1 280 R 2 10826 06 40 39 W44DF 21 29 47 43.5 238.5 2.6 47.2 -22 1 2 10826 06 40 39 06 43 39 --- 21 32 47 42.9 239.2 2.6 47.7 158 R 2 10226 06 43 39 J1838+0404 21 32 47 41.2 245.8 2.9 51.9 -10 1 2 10226 06 43 39 06 45 39 =J1838+04 21 34 47 40.9 246.2 2.9 52.1 110 R 2 9826 06 45 39 W44BC 21 34 47 42.3 239.6 2.6 47.9 -10 1 2 9826 06 45 39 06 48 39 --- 21 37 48 41.7 240.3 2.7 48.4 170 R 2 9226 06 48 39 J1838+0404 21 37 48 40.3 246.8 3.0 52.5 -10 1 2 9226 06 48 39 06 50 39 =J1838+04 21 39 48 39.9 247.2 3.0 52.7 110 R 2 8826 Schedule for VLBA_FD (Code Fd ) Page 10 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 06 50 39 W44DF 21 39 48 41.6 240.8 2.7 48.7 -10 1 2 8826 06 50 39 06 53 39 --- 21 42 49 41.0 241.5 2.8 49.1 170 R 2 8226 06 53 39 J1838+0404 21 42 49 39.3 247.8 3.1 53.0 -10 1 2 8226 06 53 39 06 55 39 =J1838+04 21 44 49 38.9 248.2 3.1 53.2 110 R 2 7826 06 55 39 W44BC 21 44 49 40.4 241.8 2.8 49.3 -10 1 2 7826 06 55 39 06 58 39 --- 21 47 50 39.8 242.4 2.9 49.7 170 R 2 7226 06 58 39 J1838+0404 21 47 50 38.3 248.8 3.1 53.5 -10 1 2 7226 06 58 39 07 00 39 =J1838+04 21 49 50 37.9 249.2 3.2 53.7 110 R 2 6826 07 00 39 W44DF 21 49 50 39.7 243.0 2.9 50.1 -10 1 2 6826 07 00 39 07 03 39 --- 21 52 50 39.1 243.6 2.9 50.4 170 R 2 6226 07 03 39 J1838+0404 21 52 50 37.3 249.7 3.2 54.0 -10 1 2 6226 07 03 39 07 05 39 =J1838+04 21 54 51 36.9 250.1 3.3 54.2 110 R 2 5826 07 05 39 W44BC 21 54 51 38.5 243.9 3.0 50.6 -10 1 2 5826 07 05 39 07 08 39 --- 21 57 51 37.9 244.5 3.0 51.0 170 R 2 5226 07 08 39 J1838+0404 21 57 51 36.2 250.6 3.3 54.5 -10 1 2 5226 07 08 39 07 10 39 =J1838+04 21 59 51 35.8 251.0 3.3 54.6 110 R 2 4826 07 10 39 W44DF 21 59 51 37.8 245.0 3.1 51.3 -10 1 2 4826 07 10 39 07 13 39 --- 22 02 52 37.2 245.6 3.1 51.6 170 R 2 4226 07 13 39 J1838+0404 22 02 52 35.2 251.5 3.4 54.9 -10 1 2 4226 07 13 39 07 15 39 =J1838+04 22 04 52 34.8 251.9 3.4 55.1 110 R 2 3826 07 15 39 W44BC 22 04 52 36.5 245.9 3.1 51.8 -10 1 2 3826 07 15 39 07 18 39 --- 22 07 53 35.9 246.4 3.2 52.1 170 R 2 3226 07 18 39 J1838+0404 22 07 53 34.2 252.4 3.5 55.3 -10 1 2 3226 07 18 39 07 20 39 =J1838+04 22 09 53 33.8 252.7 3.5 55.5 110 R 2 2826 07 20 39 W44DF 22 09 53 35.8 246.9 3.2 52.4 -10 1 2 2826 07 20 39 07 23 39 --- 22 12 54 35.2 247.5 3.3 52.7 170 R 2 2226 07 23 39 J1838+0404 22 12 54 33.2 253.2 3.6 55.7 -10 1 2 2226 07 23 39 07 25 39 =J1838+04 22 14 54 32.8 253.6 3.6 55.8 110 R 2 1826 Schedule for VLBA_FD (Code Fd ) Page 11 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 07 25 39 W44BC 22 14 54 34.6 247.7 3.3 52.8 -10 1 2 1826 07 25 39 07 28 39 --- 22 17 54 34.0 248.3 3.4 53.1 170 R 2 1226 07 28 39 J1838+0404 22 17 54 32.1 254.1 3.6 56.0 -10 1 2 1226 07 28 39 07 30 39 =J1838+04 22 19 55 31.7 254.4 3.7 56.2 110 R 2 826 07 30 39 W44DF 22 19 55 33.8 248.8 3.4 53.4 -10 1 2 826 07 30 39 07 33 39 --- 22 22 55 33.2 249.3 3.4 53.6 170 R 2 226 07 33 39 J1838+0404 22 22 55 31.1 254.9 3.7 56.4 -10 1 3 226 07 33 39 07 35 39 =J1838+04 22 24 56 30.7 255.2 3.8 56.5 110 F 1 626 07 35 39 W44BC 22 24 56 32.5 249.5 3.5 53.7 -10 1 3 626 07 35 39 07 38 39 --- 22 27 56 31.9 250.1 3.5 54.0 170 F 1 1226 07 38 39 J1838+0404 22 27 56 30.0 255.7 3.8 56.7 -10 1 3 1226 07 38 39 07 40 39 =J1838+04 22 29 56 29.6 256.0 3.8 56.8 110 F 1 1626 07 40 39 W44DF 22 29 56 31.8 250.5 3.6 54.3 -10 1 3 1626 07 40 39 07 43 39 --- 22 32 57 31.2 251.1 3.6 54.5 170 F 1 2226 07 43 39 J1838+0404 22 32 57 29.0 256.5 3.9 57.0 -10 1 3 2226 07 43 39 07 45 39 =J1838+04 22 34 57 28.6 256.8 3.9 57.1 110 F 1 2626 07 45 39 W44BC 22 34 57 30.5 251.3 3.6 54.6 -10 1 3 2626 07 45 39 07 48 39 --- 22 37 58 29.9 251.8 3.7 54.8 170 F 1 3226 07 48 39 J1838+0404 22 37 58 28.0 257.3 4.0 57.3 -10 1 3 3226 07 48 39 07 50 39 =J1838+04 22 39 58 27.5 257.6 4.0 57.4 110 F 1 3626 07 51 14 J1751+0939 22 40 33 20.2 269.4 4.8 60.8 14 1 3 3626 07 50 39 07 55 54 --- 22 45 14 19.2 270.0 4.9 60.8 280 F 1 4674 07 55 54 W44DF 22 45 14 28.7 253.1 3.8 55.4 -25 1 3 4674 07 55 54 07 58 44 --- 22 48 04 28.1 253.6 3.9 55.6 145 F 1 5241 07 58 44 J1838+0404 22 48 04 25.8 258.8 4.2 57.8 -10 1 3 5241 07 58 44 08 00 44 =J1838+04 22 50 04 25.4 259.1 4.2 57.9 110 F 1 5641 08 00 44 W44BC 22 50 04 27.4 253.7 3.9 55.7 -10 1 3 5641 08 00 44 08 03 34 --- 22 52 55 26.8 254.2 3.9 55.9 160 F 1 6208 Schedule for VLBA_FD (Code Fd ) Page 12 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 08 03 34 J1838+0404 22 52 55 24.8 259.5 4.2 58.0 -10 1 3 6208 08 03 34 08 05 34 =J1838+04 22 54 55 24.4 259.8 4.3 58.1 110 F 1 6608 08 05 34 W44DF 22 54 55 26.7 254.6 4.0 56.1 -11 1 3 6608 08 05 34 08 08 24 --- 22 57 46 26.1 255.1 4.0 56.3 159 F 1 7174 08 08 24 J1838+0404 22 57 46 23.8 260.2 4.3 58.2 -11 1 3 7174 08 08 24 08 10 24 =J1838+04 22 59 46 23.3 260.5 4.3 58.3 109 F 1 7574 08 10 24 W44BC 22 59 46 25.4 255.2 4.1 56.3 -10 1 3 7574 08 10 24 08 13 14 --- 23 02 36 24.8 255.7 4.1 56.5 160 F 1 8141 08 13 14 J1838+0404 23 02 36 22.7 260.9 4.4 58.4 -10 1 3 8141 08 13 14 08 15 14 =J1838+04 23 04 37 22.3 261.2 4.4 58.5 110 F 1 8541 08 15 14 W44DF 23 04 37 24.6 256.1 4.1 56.7 -11 1 3 8541 08 15 14 08 18 04 --- 23 07 27 24.0 256.5 4.2 56.8 159 F 1 9108 08 18 04 J1838+0404 23 07 27 21.7 261.6 4.5 58.6 -11 1 3 9108 08 18 04 08 20 04 =J1838+04 23 09 28 21.3 261.8 4.5 58.6 109 F 1 9508 08 20 04 W44BC 23 09 28 23.4 256.7 4.2 56.9 -10 1 3 9508 08 20 04 08 22 54 --- 23 12 18 22.8 257.1 4.3 57.0 160 F 1 10074 08 22 54 J1838+0404 23 12 18 20.7 262.2 4.6 58.7 -10 1 3 10074 08 22 54 08 24 54 =J1838+04 23 14 18 20.3 262.5 4.6 58.8 110 F 1 10474 08 24 54 W44DF 23 14 18 22.6 257.6 4.3 57.2 -11 1 3 10474 08 24 54 08 27 44 --- 23 17 09 22.0 258.0 4.3 57.3 159 F 1 11041 08 27 44 J1838+0404 23 17 09 19.6 262.9 4.6 58.9 -11 1 3 11041 08 27 44 08 29 44 =J1838+04 23 19 09 19.2 263.2 4.7 58.9 109 F 1 11441 08 29 44 W44BC 23 19 09 21.3 258.1 4.4 57.4 -10 1 3 11441 08 29 44 08 32 34 --- 23 22 00 20.8 258.5 4.4 57.5 160 F 1 12008 08 32 34 J1838+0404 23 22 00 18.6 263.6 4.7 59.0 -10 1 3 12008 08 32 34 08 34 34 =J1838+04 23 24 00 18.2 263.8 4.8 59.0 110 F 1 12408 08 34 34 W44DF 23 24 00 20.6 259.0 4.5 57.6 -11 1 3 12408 08 34 34 08 37 24 --- 23 26 50 20.0 259.4 4.5 57.8 159 F 1 12974 Schedule for VLBA_FD (Code Fd ) Page 13 SNR/OH(1720 MHz) Masers Toward W44 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Mon 18 Aug 2003 Day 230 --- 08 37 24 J1838+0404 23 26 50 17.6 264.2 4.8 59.1 -11 1 3 12974 08 37 24 08 39 24 =J1838+04 23 28 51 17.1 264.5 4.8 59.2 109 F 1 13374 08 39 24 W44BC 23 28 51 19.3 259.5 4.5 57.8 -10 1 3 13374 08 39 24 08 42 14 --- 23 31 41 18.7 259.9 4.6 57.9 160 F 1 13941 08 42 14 J1838+0404 23 31 41 16.5 264.9 4.9 59.2 -10 1 3 13941 08 42 14 08 44 14 =J1838+04 23 33 41 16.1 265.1 4.9 59.3 110 F 1 14341 08 44 14 W44DF 23 33 41 18.5 260.3 4.6 58.0 -11 1 3 14341 08 44 14 08 47 04 --- 23 36 32 17.9 260.7 4.7 58.2 159 F 1 14908 08 47 04 J1838+0404 23 36 32 15.5 265.5 5.0 59.3 -11 1 3 14908 08 47 04 08 49 04 =J1838+04 23 38 32 15.1 265.8 5.0 59.3 109 F 1 15308 08 49 04 W44BC 23 38 32 17.2 260.9 4.7 58.2 -10 1 3 15308 08 49 04 08 51 54 --- 23 41 23 16.6 261.3 4.8 58.3 160 F 1 15874 08 51 54 J1838+0404 23 41 23 14.5 266.1 5.0 59.4 -10 1 3 15874 08 51 54 08 53 54 =J1838+04 23 43 23 14.0 266.4 5.1 59.4 110 F 1 16274 08 54 29 J1751+0939 23 43 59 6.6 277.4 5.9 60.0 14 1 3 16274 08 53 54 08 59 09 --- 23 48 39 5.6 277.9 5.9 59.8 280 F 1 17326 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: v18cm-ian.set Matches group v20cm_2 in /home/filehost/cwalker/sched/catalogs/freq.dat FD filtered above 1760. SC filtered above 1740. Setup group: 1 Station: VLBA Total bit rate: 32 Format: VLBA1:1 Bits per sample: 2 Sample rate: 2.000 Number of channels: 8 Passes/head pos: 2 Speedup factor: 4.00 Tape speeds: Low density - 66.665 ips, High density - 40.00 ips Time per pass for 17600 ft, High density tapes is: 01:28:00 1st LO= 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 Net SB= U U L L L L L L Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= L L U U U U U U IF = A C A C A C A C VLBA FE= 20cm omit 20cm omit VLBA Synth= 15.4 2.4 15.4 The following frequency sets based on this setup were used. Frequency Set: 1 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 1 LO sum= 1720.24 1720.24 1720.17 1720.17 1719.17 1719.17 1718.17 1718.17 BBC fr= 679.76 679.76 679.83 679.83 680.83 680.83 681.83 681.83 Bandwd= 0.062 0.062 1.000 1.000 1.000 1.000 1.000 1.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = OFF PCALXB1= S1 S2 S3 S4 S5 S6 S7 S8 PCALXB2= M1 M2 M3 M4 M5 M6 M7 M8 PCALFR1= 0 0 0 0 0 0 0 0 PCALFR2= 0 0 0 0 0 0 0 0 Track assignments are: track1= 2, 6, 10, 14, 18, 22, 26, 30 track2= 3, 7, 11, 15, 19, 23, 27, 31 barrel=roll_auto SOURCE LIST -- SNR/OH(1720 MHz) Masers Toward W44 Catalog positions marked with *. Precession of date coordinates is based on stop time of first scan. Names used in schedule marked with *. Short names used in VLA and SNAP files marked with +. Observation date used in B1950/J2000 coordinate conversion (PRECDATE): 1979.900 No adjustments are made for rates (DRA, DDEC). Source Source position (RA/Dec) (B1950) (J2000) (Date) * W44DF * 18 54 00.000000 18 56 32.221496 18 56 43.464766 * 01 21 00.00000 01 24 59.36144 01 25 17.39798 From catalog imbedded in main SCHED input file. * W44BC * 18 53 29.000000 18 56 01.490177 18 56 12.750063 * 01 06 45.00000 01 10 42.17661 01 11 00.01523 From catalog imbedded in main SCHED input file. * 3C345 16 41 17.606214 * 16 42 58.809951 16 43 06.235716 J1642+3948 39 54 10.81489 * 39 48 36.99395 39 48 26.23193 From catalog imbedded in main SCHED input file. fringe finder J1838+04 18 36 19.708768 * 18 38 48.829033 18 38 59.799337 * J1838+0404 04 01 41.08993 * 04 04 24.66927 04 04 38.12745 From catalog imbedded in main SCHED input file. phase ref source, 250mJy, 5 degrees away * 3C286 13 28 49.657692 * 13 31 08.287984 13 31 17.077484 J1331+305 30 45 58.64021 * 30 30 32.95885 30 29 42.64242 From catalog imbedded in main SCHED input file. linear polarization calibrator, sets early * J1751+0939 17 49 10.387930 * 17 51 32.818573 17 51 43.156177 09 39 42.82596 * 09 39 00.72851 09 39 01.85600 From catalog imbedded in main SCHED input file. D-term cal, ICRF, 1.1 Jy point source in bh097 The solar corona can cause unstable phases for sources too close to the Sun. SCHED provides warnings at individual scans for distances less than 10 degrees. The distance from the Sun to each source in this schedule is: Source Sun distance (deg) W44DF 134.9 W44BC 134.9 3C345 91.7 J1838+0404 129.8 3C286 53.9 J1751+0939 116.9 Barry Clark estimates from predictions by Ketan Desai of IPM scattering sizes that the Sun will cause amplitude reductions on the longest VLBA baselines at a solar distance of 60deg F^(-0.6) where F is in GHz. For common VLBI bands, this is: 327 MHz 117. deg 610 MHz 81. deg 1.6 GHz 45. deg 2.3 GHz 36. deg 5.0 GHz 23. deg 8.4 GHz 17. deg 15.0 GHz 12. deg 22.0 GHz 9. deg 43.0 GHz 6. deg