COVER INFORMATION Station: VLBA_HN (Code Hn ) Experiment: BE042d; S/X observation of J0838+2453 Exp. Code: be042d Schedule Version: 1.00 Processed by SCHED version: 6.02 July 2005 PI: Philip Edwards Address: Institute of Space and Astronautical Science 3-1-1 Yoshinodai, Sagamihara Kanagawa 229-8510 Japan Phone: +81-42-759-8342 EMAIL: pge@vsop.isas.ac.jp Fax: +81-42-759-8485 Phone during observation: +81-42-759-8342 Observing mode: 128-4-2 Notes: Fringe finder: J0854+2006 (=OJ287) Ph. ref. cal.: J0837+2454 1 x 2.5 hrs dynamically scheduled centered at LST 8.5 Schedule for VLBA_HN (Code Hn ) Page 2 BE042d; S/X observation of J0838+2453 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). SYNC: Time correlator is expected to sync up. 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) SYNC ---------------------------------------------------------------------------------------- --- Sat 20 Aug 2005 Day 232 --- Next scan frequencies: 2262.49 2270.49 8412.49 8420.49 Next BBC frequencies: 837.51 829.51 812.49 820.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 16 31 03 J0854+2006 09 39 32 65.3 205.7 0.7 19.7 0 1 1 0 16 30 48 16 35 22 =0851+202 09 43 52 65.0 207.9 0.8 21.4 259 F 1 1829 16 31 01 16 37 32 J0837+2454 09 46 02 67.2 223.2 1.1 33.5 113 1 1 1829 16 37 17 16 38 21 =0834+250 09 46 52 67.1 223.6 1.1 33.8 50 F 1 2261 16 37 30 16 38 31 J0838+2453 09 47 02 67.1 223.4 1.1 33.7 5 1 1 2261 16 38 21 16 41 21 --- 09 49 52 66.8 224.8 1.2 34.6 170 F 1 3458 16 38 21 16 41 31 J0837+2454 09 50 02 66.7 225.1 1.2 34.9 5 1 1 3458 16 41 21 16 42 21 =0834+250 09 50 52 66.6 225.5 1.2 35.1 50 F 1 3857 16 41 21 16 42 31 J0838+2453 09 51 02 66.6 225.3 1.2 35.0 5 1 1 3857 16 42 21 16 45 20 --- 09 53 52 66.2 226.6 1.3 35.9 170 F 1 5053 16 42 21 16 45 30 J0837+2454 09 54 02 66.1 227.0 1.3 36.1 5 1 1 5053 16 45 20 16 46 20 =0834+250 09 54 52 66.0 227.3 1.3 36.4 50 F 1 5452 16 45 20 16 46 30 J0838+2453 09 55 02 66.1 227.2 1.3 36.3 5 1 1 5452 16 46 20 16 49 20 --- 09 57 52 65.7 228.4 1.3 37.1 170 F 1 6649 16 46 20 16 49 30 J0837+2454 09 58 02 65.6 228.7 1.3 37.3 5 1 1 6649 16 49 20 16 50 19 =0834+250 09 58 52 65.5 229.1 1.3 37.6 50 F 1 7048 16 49 20 16 50 29 J0838+2453 09 59 02 65.5 228.9 1.3 37.5 5 1 1 7048 16 50 19 16 53 19 --- 10 01 52 65.1 230.1 1.4 38.3 170 F 1 8245 16 50 19 16 53 29 J0837+2454 10 02 02 65.0 230.4 1.4 38.5 5 1 1 8245 16 53 19 16 54 19 =0834+250 10 02 52 64.9 230.8 1.4 38.7 50 F 1 8644 16 53 19 16 54 29 J0838+2453 10 03 02 65.0 230.6 1.4 38.6 5 1 1 8644 16 54 19 16 57 18 --- 10 05 52 64.6 231.8 1.5 39.4 170 F 1 9840 16 54 19 16 57 28 J0837+2454 10 06 02 64.5 232.1 1.5 39.6 5 1 1 9840 16 57 18 16 58 18 =0834+250 10 06 52 64.4 232.4 1.5 39.8 50 F 1 10239 16 57 18 16 58 28 J0838+2453 10 07 02 64.4 232.3 1.5 39.7 5 1 1 10239 16 58 18 17 01 18 --- 10 09 52 64.0 233.4 1.5 40.4 170 F 1 11436 16 58 18 Schedule for VLBA_HN (Code Hn ) Page 3 BE042d; S/X observation of J0838+2453 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). SYNC: Time correlator is expected to sync up. 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) SYNC ---------------------------------------------------------------------------------------- --- Sat 20 Aug 2005 Day 232 --- 17 01 28 J0837+2454 10 10 02 63.9 233.7 1.5 40.6 5 1 1 11436 17 01 18 17 02 17 =0834+250 10 10 52 63.8 234.0 1.5 40.8 50 F 1 11835 17 01 18 17 02 27 J0838+2453 10 11 02 63.8 233.9 1.5 40.7 5 1 1 11835 17 02 17 17 05 17 --- 10 13 52 63.4 235.0 1.6 41.4 170 F 1 13032 17 02 17 17 05 27 J0837+2454 10 14 02 63.3 235.2 1.6 41.5 5 1 1 13032 17 05 17 17 06 17 =0834+250 10 14 52 63.2 235.5 1.6 41.7 50 F 1 13430 17 05 17 17 06 27 J0838+2453 10 15 02 63.2 235.4 1.6 41.6 5 1 1 13430 17 06 17 17 09 16 --- 10 17 52 62.8 236.5 1.7 42.3 170 F 1 14627 17 06 17 17 09 26 J0837+2454 10 18 02 62.7 236.7 1.7 42.4 5 1 1 14627 17 09 16 17 10 16 =0834+250 10 18 52 62.6 237.0 1.7 42.6 50 F 1 15026 17 09 16 17 10 26 J0838+2453 10 19 02 62.6 236.9 1.7 42.5 5 1 1 15026 17 10 16 17 13 16 --- 10 21 52 62.2 237.9 1.7 43.1 170 F 1 16223 17 10 16 17 13 26 J0837+2454 10 22 02 62.1 238.1 1.7 43.3 5 1 1 16223 17 13 16 17 14 15 =0834+250 10 22 52 61.9 238.4 1.7 43.5 50 F 1 16622 17 13 16 17 14 25 J0838+2453 10 23 02 62.0 238.3 1.7 43.4 5 1 2 16622 17 14 15 17 17 15 --- 10 25 52 61.5 239.3 1.8 43.9 170 R 1 17382 17 14 15 17 17 25 J0837+2454 10 26 02 61.4 239.5 1.8 44.1 5 1 2 17382 17 17 15 17 18 15 =0834+250 10 26 52 61.3 239.8 1.8 44.2 50 R 1 16983 17 17 15 17 18 25 J0838+2453 10 27 02 61.4 239.7 1.8 44.2 5 1 2 16983 17 18 15 17 21 14 --- 10 29 52 60.9 240.6 1.9 44.7 170 R 1 15786 17 18 15 17 21 24 J0837+2454 10 30 02 60.8 240.9 1.9 44.8 5 1 2 15786 17 21 14 17 22 14 =0834+250 10 30 52 60.7 241.2 1.9 45.0 50 R 1 15387 17 21 14 17 22 24 J0838+2453 10 31 02 60.7 241.0 1.9 44.9 5 1 2 15387 17 22 14 17 25 14 --- 10 33 52 60.3 241.9 1.9 45.4 170 R 1 14190 17 22 14 17 25 24 J0837+2454 10 34 02 60.2 242.2 1.9 45.5 5 1 2 14190 17 25 14 17 26 14 =0834+250 10 34 52 60.0 242.4 1.9 45.7 50 R 1 13791 17 25 14 17 26 23 J0838+2453 10 35 02 60.1 242.3 1.9 45.6 5 1 2 13791 17 26 14 17 29 13 --- 10 37 52 59.6 243.2 2.0 46.1 170 R 1 12595 17 26 14 Schedule for VLBA_HN (Code Hn ) Page 4 BE042d; S/X observation of J0838+2453 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). SYNC: Time correlator is expected to sync up. 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) SYNC ---------------------------------------------------------------------------------------- --- Sat 20 Aug 2005 Day 232 --- 17 29 23 J0837+2454 10 38 02 59.5 243.4 2.0 46.2 5 1 2 12595 17 29 13 17 30 13 =0834+250 10 38 52 59.4 243.7 2.0 46.3 50 R 1 12196 17 29 13 17 30 23 J0838+2453 10 39 02 59.4 243.6 2.0 46.3 5 1 2 12196 17 30 13 17 33 12 --- 10 41 52 59.0 244.4 2.1 46.7 170 R 1 10999 17 30 13 17 33 22 J0837+2454 10 42 02 58.9 244.7 2.1 46.8 5 1 2 10999 17 33 12 17 34 12 =0834+250 10 42 52 58.7 244.9 2.1 47.0 50 R 1 10600 17 33 12 17 34 22 J0838+2453 10 43 02 58.8 244.8 2.1 46.9 5 1 2 10600 17 34 12 17 37 12 --- 10 45 52 58.3 245.6 2.1 47.3 170 R 1 9403 17 34 12 17 37 22 J0837+2454 10 46 02 58.2 245.8 2.1 47.4 5 1 2 9403 17 37 12 17 38 12 =0834+250 10 46 52 58.1 246.1 2.1 47.5 50 R 1 9005 17 37 12 17 38 22 J0838+2453 10 47 02 58.1 246.0 2.1 47.5 5 1 2 9005 17 38 12 17 41 11 --- 10 49 52 57.6 246.8 2.2 47.9 170 R 1 7808 17 38 12 17 41 21 J0837+2454 10 50 02 57.5 247.0 2.2 48.0 5 1 2 7808 17 41 11 17 42 11 =0834+250 10 50 52 57.4 247.2 2.2 48.1 50 R 1 7409 17 41 11 17 42 21 J0838+2453 10 51 02 57.4 247.1 2.2 48.0 5 1 2 7409 17 42 11 17 45 10 --- 10 53 52 57.0 247.9 2.3 48.4 170 R 1 6212 17 42 11 17 45 20 J0837+2454 10 54 02 56.8 248.1 2.3 48.5 5 1 2 6212 17 45 10 17 46 10 =0834+250 10 54 52 56.7 248.3 2.3 48.6 50 R 1 5813 17 45 10 17 46 20 J0838+2453 10 55 02 56.8 248.2 2.3 48.5 5 1 2 5813 17 46 10 17 49 10 --- 10 57 52 56.3 249.0 2.3 48.9 170 R 1 4617 17 46 10 17 49 20 J0837+2454 10 58 02 56.2 249.2 2.3 49.0 5 1 2 4617 17 49 10 17 50 10 =0834+250 10 58 52 56.0 249.4 2.3 49.1 50 R 1 4218 17 49 10 17 50 20 J0838+2453 10 59 02 56.1 249.3 2.3 49.0 5 1 2 4218 17 50 10 17 53 09 --- 11 01 52 55.6 250.0 2.4 49.3 170 R 1 3021 17 50 10 17 53 19 J0837+2454 11 02 02 55.5 250.2 2.4 49.4 5 1 2 3021 17 53 09 17 54 09 =0834+250 11 02 52 55.3 250.5 2.4 49.5 50 R 1 2622 17 53 09 17 54 19 J0838+2453 11 03 02 55.4 250.3 2.4 49.5 5 1 2 2622 17 54 09 17 57 08 --- 11 05 52 54.9 251.1 2.5 49.8 170 R 1 1425 17 54 09 Schedule for VLBA_HN (Code Hn ) Page 5 BE042d; S/X observation of J0838+2453 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). SYNC: Time correlator is expected to sync up. 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) SYNC ---------------------------------------------------------------------------------------- --- Sat 20 Aug 2005 Day 232 --- 17 57 18 J0837+2454 11 06 02 54.8 251.3 2.5 49.8 5 1 2 1425 17 57 08 17 58 08 =0834+250 11 06 52 54.6 251.5 2.5 49.9 50 R 1 1026 17 57 08 17 58 18 J0838+2453 11 07 02 54.7 251.4 2.5 49.9 5 1 3 1026 17 58 08 18 01 08 --- 11 09 52 54.2 252.1 2.5 50.2 170 F 1 170 17 58 08 18 01 18 J0837+2454 11 10 02 54.1 252.3 2.5 50.2 5 1 3 170 18 01 08 18 02 08 =0834+250 11 10 52 53.9 252.5 2.5 50.3 50 F 1 569 18 01 08 18 02 18 J0838+2453 11 11 02 54.0 252.4 2.5 50.3 5 1 3 569 18 02 08 18 05 07 --- 11 13 52 53.5 253.1 2.6 50.5 170 F 1 1766 18 02 08 18 05 17 J0837+2454 11 14 02 53.4 253.2 2.6 50.6 5 1 3 1766 18 05 07 18 06 07 =0834+250 11 14 52 53.2 253.4 2.6 50.7 50 F 1 2165 18 05 07 18 06 17 J0838+2453 11 15 02 53.3 253.3 2.6 50.6 5 1 3 2165 18 06 07 18 09 06 --- 11 17 52 52.8 254.0 2.7 50.9 170 F 1 3362 18 06 07 18 09 16 J0837+2454 11 18 02 52.7 254.2 2.7 50.9 5 1 3 3362 18 09 06 18 10 06 =0834+250 11 18 52 52.5 254.4 2.7 51.0 50 F 1 3761 18 09 06 18 10 16 J0838+2453 11 19 02 52.6 254.3 2.7 51.0 5 1 3 3761 18 10 06 18 13 06 --- 11 21 52 52.1 255.0 2.7 51.2 170 F 1 4957 18 10 06 18 13 16 J0837+2454 11 22 02 52.0 255.1 2.7 51.3 5 1 3 4957 18 13 06 18 14 06 =0834+250 11 22 52 51.8 255.3 2.7 51.3 50 F 1 5356 18 13 06 18 14 16 J0838+2453 11 23 02 51.9 255.2 2.7 51.3 5 1 3 5356 18 14 06 18 17 05 --- 11 25 52 51.4 255.9 2.8 51.5 170 F 1 6553 18 14 06 18 17 15 J0837+2454 11 26 02 51.3 256.0 2.8 51.6 5 1 3 6553 18 17 05 18 18 05 =0834+250 11 26 52 51.1 256.2 2.8 51.6 50 F 1 6952 18 17 05 18 18 15 J0838+2453 11 27 02 51.2 256.1 2.8 51.6 5 1 3 6952 18 18 05 18 21 05 --- 11 29 52 50.7 256.8 2.9 51.8 170 F 1 8149 18 18 05 18 21 14 J0837+2454 11 30 02 50.6 256.9 2.9 51.8 5 1 3 8149 18 21 05 18 22 04 =0834+250 11 30 52 50.4 257.1 2.9 51.9 50 F 1 8547 18 21 05 18 22 14 J0838+2453 11 31 02 50.5 257.0 2.9 51.9 5 1 3 8547 18 22 04 18 25 04 --- 11 33 52 50.0 257.6 2.9 52.0 170 F 1 9744 18 22 04 Schedule for VLBA_HN (Code Hn ) Page 6 BE042d; S/X observation of J0838+2453 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). SYNC: Time correlator is expected to sync up. 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) SYNC ---------------------------------------------------------------------------------------- --- Sat 20 Aug 2005 Day 232 --- 18 25 14 J0837+2454 11 34 02 49.8 257.8 2.9 52.1 5 1 3 9744 18 25 04 18 26 04 =0834+250 11 34 52 49.7 258.0 2.9 52.1 50 F 1 10143 18 25 04 18 26 14 J0838+2453 11 35 02 49.8 257.9 2.9 52.1 5 1 3 10143 18 26 04 18 29 03 --- 11 37 52 49.2 258.5 3.0 52.3 170 F 1 11340 18 26 04 18 29 13 J0837+2454 11 38 02 49.1 258.7 3.0 52.3 5 1 3 11340 18 29 03 18 30 03 =0834+250 11 38 52 49.0 258.8 3.0 52.4 50 F 1 11739 18 29 03 18 30 13 J0838+2453 11 39 02 49.0 258.7 3.0 52.3 5 1 3 11739 18 30 03 18 33 03 --- 11 41 52 48.5 259.3 3.1 52.5 170 F 1 12935 18 30 03 18 33 13 J0837+2454 11 42 02 48.4 259.5 3.1 52.5 5 1 3 12935 18 33 03 18 34 02 =0834+250 11 42 52 48.3 259.7 3.1 52.6 50 F 1 13334 18 33 03 18 34 12 J0838+2453 11 43 02 48.3 259.6 3.1 52.5 5 1 3 13334 18 34 02 18 37 02 --- 11 45 52 47.8 260.2 3.1 52.7 170 F 1 14531 18 34 02 18 37 12 J0837+2454 11 46 02 47.7 260.3 3.1 52.7 5 1 3 14531 18 37 02 18 38 02 =0834+250 11 46 52 47.5 260.5 3.1 52.8 50 F 1 14930 18 37 02 18 38 12 J0838+2453 11 47 02 47.6 260.4 3.1 52.7 5 1 3 14930 18 38 02 18 41 01 --- 11 49 52 47.1 261.0 3.2 52.9 170 F 1 16127 18 38 02 18 41 11 J0837+2454 11 50 02 47.0 261.1 3.2 52.9 5 1 3 16127 18 41 01 18 42 01 =0834+250 11 50 52 46.8 261.3 3.2 52.9 50 F 1 16526 18 41 01 18 42 11 J0838+2453 11 51 02 46.9 261.2 3.2 52.9 5 1 4 16526 18 42 01 18 45 01 --- 11 53 52 46.4 261.8 3.3 53.0 170 R 1 17478 18 42 01 18 45 11 J0837+2454 11 54 02 46.2 261.9 3.3 53.0 5 1 4 17478 18 45 01 18 46 00 =0834+250 11 54 52 46.1 262.1 3.3 53.1 50 R 1 17079 18 45 01 18 46 10 J0838+2453 11 55 02 46.1 262.0 3.3 53.1 5 1 4 17079 18 46 00 18 49 00 --- 11 57 52 45.6 262.6 3.3 53.2 170 R 1 15882 18 46 00 18 49 10 J0837+2454 11 58 02 45.5 262.7 3.3 53.2 5 1 4 15882 18 49 00 18 50 00 =0834+250 11 58 52 45.4 262.9 3.3 53.2 50 R 1 15483 18 49 00 18 50 10 J0838+2453 11 59 02 45.4 262.8 3.3 53.2 5 1 4 15483 18 50 00 18 52 59 --- 12 01 52 44.9 263.3 3.4 53.3 170 R 1 14286 18 50 00 Schedule for VLBA_HN (Code Hn ) Page 7 BE042d; S/X observation of J0838+2453 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). SYNC: Time correlator is expected to sync up. 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) SYNC ---------------------------------------------------------------------------------------- --- Sat 20 Aug 2005 Day 232 --- 18 53 09 J0837+2454 12 02 02 44.8 263.5 3.4 53.3 5 1 4 14286 18 52 59 18 53 59 =0834+250 12 02 52 44.6 263.6 3.4 53.3 50 R 1 13888 18 52 59 18 56 09 J0854+2006 12 05 02 44.3 255.4 3.2 49.0 118 1 4 13888 18 55 54 19 00 28 =0851+202 12 09 22 43.6 256.3 3.2 49.2 259 R 1 12059 18 56 07 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: /home/filehost/cwalker/sched/setups/vsx-128-4-2-R.set Matches group vsx_22 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 2 Station: VLBA_HN Total bit rate: 128 Format: VLBA1:4 Bits per sample: 2 Sample rate: 16.000 Number of channels: 4 Passes/head pos: 1 Speedup factor: 2.00 Tape used at high density at 80.000 ips. Time per pass is 44.00 minutes. 1st LO= 3100.00 3100.00 7600.00 7600.00 Net SB= U U U U Pol. = RCP RCP RCP RCP BBC = 1 2 3 4 BBC SB= L L U U IF = A A B B VLBA FE= 13cm 4cm 13cm 4cm VLBA Synth= 7.6 3.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 2 Setup file default. Used pcal sets: 1 LO sum= 2262.49 2270.49 8412.49 8420.49 BBC fr= 837.51 829.51 812.49 820.49 Bandwd= 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S1 S3 S1 S2 S3 S4 PCALXB2= S2 S4 S2 S4 M1 M2 M3 M4 PCALFR1= 510 510 6510 6510 0 0 0 0 PCALFR2= 510 510 6510 6510 0 0 0 0 Track assignments are: track1= 2, 18, 3, 19 barrel=roll_auto SOURCE LIST -- BE042d; S/X observation of J0838+2453 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). Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * J0838+2453 08 35 13.074679 * 08 38 10.950000 08 38 29.568600 0.00 25 04 15.80443 * 24 53 42.86000 24 52 42.70410 0.00 From catalog imbedded in main SCHED input file. 1.601 scan hours, 72.053 baseline hours above horizon. * J0837+2454 08 34 42.314443 * 08 37 40.245685 08 37 58.870939 0.23 0834+250 25 04 54.32847 * 24 54 23.12160 24 53 23.15207 0.41 J0837+24 /home/filehost/cwalker/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.485 scan hours, 21.815 baseline hours above horizon. * J0854+2006 08 51 57.250617 * 08 54 48.874929 08 55 06.795238 0.21 0851+202 20 17 58.41740 * 20 06 30.64085 20 05 25.09792 0.40 J0854+20 /home/filehost/cwalker/sched/catalogs/sources.vlba OJ287 VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.144 scan hours, 6.482 baseline hours above horizon. 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) J0838+2453 23.0 J0837+2454 23.1 J0854+2006 17.4 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