COVER INFORMATION Station: VLBA_NL (Code Nl ) Experiment: SNR/OH(1720 MHz) Masers Toward W28 Exp. Code: BH097J Schedule Version: 1.00 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 7391 EMAIL: ihoffman@aoc.nrao.edu Fax: 505 835 7027 Phone during observation: 505 835 7391 Observing mode: 18 cm VLBA non-standard correlator setup Notes: Main science run toward W28 OH 1720 masers 4 baseband channels The fringe finder is 3C345=J1642+3948 Phase referencing with in-beam maser Schedule for VLBA_NL (Code Nl ) Page 2 SNR/OH(1720 MHz) Masers Toward W28 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 24 Feb 2003 Day 55 --- Next scan frequencies: 1720.65 1720.65 1720.74 1720.74 Next BBC frequencies: 679.35 679.35 679.26 679.26 Next scan bandwidths: 0.06 0.06 0.06 0.06 12 30 00 3C286 16 39 36 50.9 268.9 3.1 59.9 0 1 1 0 Stopped 12 31 40 --- 16 41 17 50.6 269.2 3.2 59.9 100 S 1 0 12 31 55 3C286 16 41 32 50.5 269.2 3.2 59.9 9 1 1 0 12 31 55 12 36 55 --- 16 46 33 49.6 270.0 3.3 59.9 300 F 1 1000 12 40 53 J1751+0939 16 50 31 55.2 152.9 -1.0 -20.1 154 1 1 1000 12 40 53 12 45 33 --- 16 55 12 55.6 154.8 -0.9 -18.8 280 F 1 1933 12 47 30 3C345 16 57 09 86.7 234.7 0.2 52.4 48 1 1 1933 12 47 30 12 52 30 --- 17 02 10 85.9 242.9 0.3 59.8 300 F 1 2933 12 52 30 W28CF 17 02 10 23.4 165.0 -1.0 -12.1 -131 1 1 2933 12 52 30 12 55 38 --- 17 05 19 23.6 165.8 -0.9 -11.5 57 F 1 3560 12 55 38 W28AB 17 05 19 23.7 166.0 -0.9 -11.3 -6 1 1 3560 12 55 38 12 58 46 --- 17 08 27 23.8 166.8 -0.9 -10.7 182 F 1 4187 12 58 46 W28CF 17 08 27 23.7 166.6 -0.9 -10.9 -6 1 1 4187 12 58 46 13 01 54 --- 17 11 36 23.9 167.3 -0.8 -10.3 182 F 1 4813 13 01 54 W28AB 17 11 36 23.9 167.6 -0.8 -10.1 -6 1 1 4813 13 01 54 13 05 02 --- 17 14 44 24.1 168.3 -0.8 -9.5 182 F 1 5440 13 05 02 W28CF 17 14 44 24.0 168.1 -0.8 -9.6 -6 1 1 5440 13 05 02 13 08 10 --- 17 17 53 24.1 168.9 -0.7 -9.0 182 F 1 6067 13 08 10 W28AB 17 17 53 24.2 169.1 -0.7 -8.8 -6 1 1 6067 13 08 10 13 11 18 --- 17 21 01 24.3 169.9 -0.7 -8.2 182 F 1 6693 13 11 18 W28CF 17 21 01 24.2 169.7 -0.7 -8.4 -6 1 1 6693 13 11 18 13 14 26 --- 17 24 10 24.3 170.5 -0.6 -7.7 182 F 1 7320 13 14 26 W28AB 17 24 10 24.4 170.7 -0.6 -7.6 -6 1 1 7320 13 14 26 13 17 34 --- 17 27 18 24.5 171.5 -0.6 -6.9 182 F 1 7947 13 17 34 W28CF 17 27 18 24.4 171.2 -0.6 -7.1 -6 1 1 7947 13 17 34 13 20 42 --- 17 30 27 24.5 172.0 -0.5 -6.5 182 F 1 8573 Schedule for VLBA_NL (Code Nl ) Page 3 SNR/OH(1720 MHz) Masers Toward W28 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 24 Feb 2003 Day 55 --- 13 20 42 W28AB 17 30 27 24.6 172.3 -0.5 -6.3 -6 1 1 8573 13 20 42 13 23 50 --- 17 33 35 24.6 173.0 -0.5 -5.6 182 F 1 9200 13 23 50 W28CF 17 33 35 24.6 172.8 -0.5 -5.8 -6 1 1 9200 13 23 50 13 26 58 --- 17 36 44 24.6 173.6 -0.4 -5.2 182 F 1 9827 13 26 58 W28AB 17 36 44 24.7 173.8 -0.4 -5.0 -6 1 1 9827 13 26 58 13 30 06 --- 17 39 52 24.8 174.6 -0.4 -4.4 182 F 1 10453 13 33 22 3C286 17 43 09 39.1 278.7 4.2 58.8 121 1 1 10453 13 33 22 13 38 22 --- 17 48 10 38.1 279.4 4.3 58.6 300 F 1 11453 13 41 57 J1751+0939 17 51 45 57.9 180.0 0.0 0.0 143 1 1 11453 13 41 57 13 46 37 --- 17 56 26 57.9 182.2 0.1 1.7 280 F 1 12387 13 46 37 W28CF 17 56 26 24.9 178.6 -0.1 -1.2 -72 1 1 12387 13 46 37 13 49 45 --- 17 59 35 24.9 179.4 0.0 -0.5 116 F 1 13013 13 49 45 W28AB 17 59 35 24.9 179.6 0.0 -0.3 -6 1 1 13013 13 49 45 13 52 53 --- 18 02 43 24.9 180.4 0.0 0.3 182 F 1 13640 13 52 53 W28CF 18 02 43 24.9 180.2 0.0 0.1 -6 1 1 13640 13 52 53 13 56 01 --- 18 05 52 24.9 181.0 0.1 0.8 182 F 1 14267 13 56 01 W28AB 18 05 52 24.9 181.2 0.1 1.0 -6 1 1 14267 13 56 01 13 59 09 --- 18 09 00 24.9 182.0 0.1 1.6 182 F 1 14893 13 59 09 W28CF 18 09 00 24.9 181.8 0.1 1.4 -6 1 1 14893 13 59 09 14 02 17 --- 18 12 09 24.9 182.6 0.2 2.1 182 F 1 15520 14 02 17 W28AB 18 12 09 24.9 182.8 0.2 2.3 -6 1 1 15520 14 02 17 14 05 25 --- 18 15 17 24.9 183.6 0.2 2.9 182 F 1 16147 14 05 25 W28CF 18 15 17 24.8 183.4 0.2 2.7 -6 1 1 16147 14 05 25 14 08 33 --- 18 18 26 24.8 184.1 0.3 3.4 182 F 1 16773 14 08 33 W28AB 18 18 26 24.8 184.4 0.3 3.6 -6 1 1 16773 14 08 33 14 11 41 --- 18 21 34 24.8 185.2 0.3 4.2 182 F 1 17400 14 11 41 W28CF 18 21 34 24.7 184.9 0.3 4.0 -6 1 2 17400 14 11 41 14 14 49 --- 18 24 43 24.7 185.7 0.4 4.6 182 R 1 16773 Schedule for VLBA_NL (Code Nl ) Page 4 SNR/OH(1720 MHz) Masers Toward W28 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 24 Feb 2003 Day 55 --- 14 14 49 W28AB 18 24 43 24.7 186.0 0.4 4.8 -6 1 2 16773 14 14 49 14 17 57 --- 18 27 51 24.6 186.8 0.4 5.5 182 R 1 16147 14 17 57 W28CF 18 27 51 24.6 186.5 0.4 5.3 -6 1 2 16147 14 17 57 14 21 05 --- 18 31 00 24.6 187.3 0.5 5.9 182 R 1 15520 14 21 05 W28AB 18 31 00 24.6 187.5 0.5 6.1 -6 1 2 15520 14 21 05 14 24 13 --- 18 34 08 24.5 188.3 0.6 6.8 182 R 1 14893 14 24 13 W28CF 18 34 08 24.5 188.1 0.5 6.6 -6 1 2 14893 14 24 13 14 27 21 --- 18 37 17 24.4 188.9 0.6 7.2 182 R 1 14267 14 27 21 W28AB 18 37 17 24.4 189.1 0.6 7.4 -6 1 2 14267 14 27 21 14 30 29 --- 18 40 25 24.3 189.9 0.7 8.0 182 R 1 13640 14 33 31 3C286 18 43 27 28.1 287.1 5.2 55.8 111 1 2 13640 14 33 31 14 38 31 --- 18 48 28 27.2 287.8 5.3 55.5 300 R 1 12640 14 41 27 J1751+0939 18 51 25 55.3 206.5 1.0 19.7 114 1 2 12640 14 41 27 14 46 07 --- 18 56 05 54.9 208.4 1.1 21.1 280 R 1 11707 14 49 17 3C345 18 59 16 64.3 277.1 2.3 74.4 138 1 2 11707 14 49 17 14 54 17 --- 19 04 17 63.4 277.7 2.4 74.2 300 R 1 10707 14 54 17 W28CF 19 04 17 23.3 195.6 1.0 12.6 -86 1 2 10707 14 54 17 14 57 25 --- 19 07 26 23.2 196.3 1.1 13.2 102 R 1 10080 14 57 25 W28AB 19 07 26 23.2 196.6 1.1 13.4 -6 1 2 10080 14 57 25 15 00 33 --- 19 10 34 23.0 197.3 1.2 14.0 182 R 1 9453 15 00 33 W28CF 19 10 34 23.0 197.1 1.1 13.8 -6 1 2 9453 15 00 33 15 03 41 --- 19 13 43 22.8 197.8 1.2 14.4 182 R 1 8827 15 03 41 W28AB 19 13 43 22.8 198.1 1.2 14.6 -6 1 2 8827 15 03 41 15 06 49 --- 19 16 51 22.6 198.8 1.3 15.2 182 R 1 8200 15 06 49 W28CF 19 16 51 22.6 198.6 1.2 15.0 -6 1 2 8200 15 06 49 15 09 57 --- 19 20 00 22.4 199.4 1.3 15.6 182 R 1 7573 15 09 57 W28AB 19 20 00 22.4 199.6 1.3 15.8 -6 1 2 7573 15 09 57 15 13 05 --- 19 23 08 22.2 200.3 1.4 16.4 182 R 1 6947 Schedule for VLBA_NL (Code Nl ) Page 5 SNR/OH(1720 MHz) Masers Toward W28 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 24 Feb 2003 Day 55 --- 15 13 05 W28CF 19 23 08 22.3 200.1 1.4 16.2 -6 1 2 6947 15 13 05 15 16 13 --- 19 26 17 22.0 200.9 1.4 16.8 182 R 1 6320 15 16 13 W28AB 19 26 17 22.0 201.1 1.4 17.0 -6 1 2 6320 15 16 13 15 19 21 --- 19 29 25 21.8 201.8 1.5 17.6 182 R 1 5693 15 19 21 W28CF 19 29 25 21.8 201.6 1.5 17.4 -6 1 2 5693 15 19 21 15 22 29 --- 19 32 34 21.6 202.3 1.5 18.0 182 R 1 5067 15 22 29 W28AB 19 32 34 21.6 202.6 1.5 18.2 -6 1 2 5067 15 22 29 15 25 37 --- 19 35 42 21.4 203.3 1.6 18.7 182 R 1 4440 15 25 37 W28CF 19 35 42 21.4 203.1 1.6 18.6 -6 1 2 4440 15 25 37 15 28 45 --- 19 38 51 21.2 203.8 1.6 19.1 182 R 1 3813 15 28 45 W28AB 19 38 51 21.1 204.0 1.6 19.3 -6 1 2 3813 15 28 45 15 31 53 --- 19 41 59 20.9 204.8 1.7 19.9 182 R 1 3187 15 31 53 W28CF 19 41 59 20.9 204.5 1.7 19.7 -6 1 2 3187 15 31 53 15 35 01 --- 19 45 08 20.7 205.3 1.7 20.3 182 R 1 2560 15 35 01 W28AB 19 45 08 20.6 205.5 1.7 20.4 -6 1 2 2560 15 35 01 15 38 09 --- 19 48 16 20.4 206.2 1.8 21.0 182 R 1 1933 15 39 57 J1751+0939 19 50 04 48.7 227.5 2.0 33.9 45 1 2 1933 15 39 57 15 44 37 --- 19 54 45 48.0 228.9 2.1 34.8 280 R 1 1000 15 46 51 3C345 19 57 00 53.7 283.5 3.2 70.7 92 1 2 1000 15 46 51 15 51 51 --- 20 02 01 52.8 284.0 3.3 70.3 300 R 1 0 15 51 51 W28CF 20 02 01 19.2 209.1 2.0 23.3 -73 1 1 0 15 51 51 15 54 58 --- 20 05 08 18.9 209.8 2.1 23.8 114 F 2 623 15 54 58 W28AB 20 05 08 18.9 210.0 2.1 24.0 -6 1 1 623 15 54 58 15 58 05 --- 20 08 16 18.6 210.7 2.1 24.5 181 F 2 1247 15 58 05 W28CF 20 08 16 18.7 210.5 2.1 24.3 -6 1 1 1247 15 58 05 16 01 12 --- 20 11 23 18.4 211.2 2.2 24.9 181 F 2 1870 16 01 12 W28AB 20 11 23 18.3 211.4 2.2 25.0 -6 1 1 1870 16 01 12 16 04 19 --- 20 14 31 18.0 212.1 2.2 25.5 181 F 2 2493 Schedule for VLBA_NL (Code Nl ) Page 6 SNR/OH(1720 MHz) Masers Toward W28 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 24 Feb 2003 Day 55 --- 16 04 19 W28CF 20 14 31 18.1 211.8 2.2 25.4 -6 1 1 2493 16 04 19 16 07 26 --- 20 17 38 17.7 212.5 2.3 25.9 181 F 2 3117 16 07 26 W28AB 20 17 38 17.7 212.7 2.3 26.1 -6 1 1 3117 16 07 26 16 10 33 --- 20 20 46 17.4 213.4 2.3 26.6 181 F 2 3740 16 10 33 W28CF 20 20 46 17.4 213.2 2.3 26.4 -6 1 1 3740 16 10 33 16 13 40 --- 20 23 53 17.1 213.9 2.4 26.9 181 F 2 4363 16 13 40 W28AB 20 23 53 17.0 214.1 2.4 27.1 -6 1 1 4363 16 13 40 16 16 47 --- 20 27 01 16.7 214.8 2.4 27.6 181 F 2 4987 16 16 47 W28CF 20 27 01 16.8 214.5 2.4 27.4 -6 1 1 4987 16 16 47 16 19 54 --- 20 30 08 16.4 215.2 2.5 27.9 181 F 2 5610 16 19 54 W28AB 20 30 08 16.4 215.4 2.5 28.1 -6 1 1 5610 16 19 54 16 23 01 --- 20 33 16 16.0 216.1 2.5 28.6 181 F 2 6233 16 23 01 W28CF 20 33 16 16.1 215.9 2.5 28.4 -6 1 1 6233 16 23 01 16 26 08 --- 20 36 23 15.8 216.5 2.6 28.9 181 F 2 6857 16 26 08 W28AB 20 36 23 15.7 216.7 2.6 29.1 -6 1 1 6857 16 26 08 16 29 15 --- 20 39 31 15.3 217.4 2.6 29.5 181 F 2 7480 16 29 15 W28CF 20 39 31 15.4 217.2 2.6 29.4 -6 1 1 7480 16 29 15 16 32 22 --- 20 42 38 15.1 217.8 2.7 29.9 181 F 2 8103 16 32 22 W28AB 20 42 38 15.0 218.0 2.7 30.0 -6 1 1 8103 16 32 22 16 35 29 --- 20 45 46 14.6 218.7 2.7 30.5 181 F 2 8727 16 37 04 J1751+0939 20 47 21 39.9 243.0 2.9 42.4 39 1 1 8727 16 37 04 16 41 44 --- 20 52 02 39.1 244.1 3.0 42.9 280 F 2 9660 16 41 44 W28CF 20 52 02 14.0 219.7 2.8 31.3 -56 1 1 9660 16 41 44 16 44 51 --- 20 55 10 13.6 220.4 2.9 31.7 131 F 2 10283 16 44 51 W28AB 20 55 10 13.5 220.6 2.9 31.9 -6 1 1 10283 16 44 51 16 47 58 --- 20 58 17 13.1 221.2 3.0 32.3 181 F 2 10907 16 47 58 W28CF 20 58 17 13.2 221.0 2.9 32.2 -6 1 1 10907 16 47 58 16 51 05 --- 21 01 25 12.8 221.6 3.0 32.6 181 F 2 11530 Schedule for VLBA_NL (Code Nl ) Page 7 SNR/OH(1720 MHz) Masers Toward W28 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 24 Feb 2003 Day 55 --- 16 51 05 W28AB 21 01 25 12.7 221.8 3.0 32.8 -6 1 1 11530 16 51 05 16 54 12 --- 21 04 32 12.3 222.4 3.1 33.2 181 F 2 12153 16 54 12 W28CF 21 04 32 12.4 222.2 3.0 33.1 -6 1 1 12153 16 54 12 16 57 19 --- 21 07 40 12.0 222.8 3.1 33.5 181 F 2 12777 16 57 19 W28AB 21 07 40 11.9 223.0 3.1 33.7 -6 1 1 12777 16 57 19 17 00 26 --- 21 10 47 11.5 223.7 3.2 34.1 181 F 2 13400 17 00 26 W28CF 21 10 47 11.6 223.5 3.1 34.0 -6 1 1 13400 17 00 26 17 03 33 --- 21 13 55 11.2 224.1 3.2 34.4 181 F 2 14023 17 03 33 W28AB 21 13 55 11.1 224.3 3.2 34.5 -6 1 1 14023 17 03 33 17 06 40 --- 21 17 02 10.7 224.9 3.3 34.9 181 F 2 14647 17 06 40 W28CF 21 17 02 10.8 224.7 3.2 34.8 -6 1 1 14647 17 06 40 17 09 47 --- 21 20 10 10.4 225.3 3.3 35.2 181 F 2 15270 17 09 47 W28AB 21 20 10 10.3 225.5 3.3 35.4 -6 1 1 15270 17 09 47 17 12 54 --- 21 23 17 9.9 226.0 3.4 35.8 181 F 2 15893 17 12 54 W28CF 21 23 17 10.0 225.9 3.4 35.6 -6 1 1 15893 17 12 54 17 16 01 --- 21 26 25 9.6 226.4 3.4 36.1 181 F 2 16517 17 16 01 W28AB 21 26 25 9.5 226.6 3.4 36.2 -6 1 1 16517 17 16 01 17 19 08 --- 21 29 32 9.1 227.2 3.5 36.6 181 F 2 17140 17 19 08 W28CF 21 29 32 9.2 227.0 3.5 36.5 -6 1 2 17140 17 19 08 17 22 15 --- 21 32 40 8.7 227.6 3.5 36.9 181 R 2 17437 17 22 15 W28AB 21 32 40 8.6 227.8 3.5 37.0 -6 1 2 17437 17 22 15 17 25 22 --- 21 35 47 8.2 228.4 3.6 37.4 181 R 2 16813 17 26 47 J1751+0939 21 37 13 31.2 253.8 3.8 46.6 33 1 2 16813 17 26 47 17 31 27 --- 21 41 53 30.4 254.7 3.8 46.9 280 R 2 15880 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: 16 Format: VLBA1:1 Bits per sample: 2 Sample rate: 2.000 Number of channels: 4 Passes/head pos: 4 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 Net SB= U U L L Pol. = RCP LCP RCP LCP BBC = 1 2 3 4 BBC SB= L L U U IF = 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= 1720.65 1720.65 1720.74 1720.74 BBC fr= 679.35 679.35 679.26 679.26 Bandwd= 0.062 0.062 0.062 0.062 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = OFF PCALXB1= S1 S2 S3 S4 OFF OFF OFF OFF PCALXB2= M1 M2 M3 M4 OFF OFF OFF OFF 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 track2= 18, 22, 26, 30 track3= 3, 7, 11, 15 track4= 19, 23, 27, 31 barrel=roll_auto SOURCE LIST -- SNR/OH(1720 MHz) Masers Toward W28 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) * W28CF 17 58 50.110804 * 18 01 52.705600 18 02 02.511050 -23 19 26.19863 *-23 19 24.63900 -23 19 28.58069 From catalog imbedded in main SCHED input file. maser source, 70Jy F39 phase ref maser, posn from bf029 * W28AB * 17 57 55.000000 18 00 57.539349 18 01 07.346391 *-23 17 00.00000 -23 17 02.45920 -23 17 06.62998 From catalog imbedded in main SCHED input file. maser source, 2Jy * 3C345 16 41 17.606214 * 16 42 58.809951 16 43 04.451428 J1642+3948 39 54 10.81489 * 39 48 36.99395 39 47 55.98592 From catalog imbedded in main SCHED input file. fringe finder, ~60deg away to the North * J1751+0939 17 49 10.387930 * 17 51 32.818573 17 51 40.421629 J1331+305 09 39 42.82596 * 09 39 00.72851 09 38 43.99735 From catalog imbedded in main SCHED input file. D-term calibrator, ICRF source, 1.2JY at 2GHz J1331+3030 13 28 49.657691 * 13 31 08.287984 13 31 17.338577 1328+307 30 45 58.64021 * 30 30 32.95885 30 29 24.40431 * 3C286 /home/filehost/cwalker/sched/catalogs/sources.vlba J1331+30 VLBA Calib. Survey - ICRF Frame - reduced by GSFC group - Aug 2001 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) W28CF 65.1 W28AB 65.3 3C345 93.5 J1751+0939 71.7 3C286 132.8 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