COVER INFORMATION Station: VLBA_HN (Code Hn ) Experiment: 3mm observations of 3C274 Exp. Code: br074b Schedule Version: 1.00 Processed by SCHED version: Release of 02 July 2002 PI: Craig Walker Address: National Radio Astronomy Observatory P. O. Box O Socorro, New Mexico, 87801 U.S.A. Phone: 505 835 7247 EMAIL: cwalker@nrao.edu Fax: 505 835 7027 Phone during observation: 505 835 7247 Observing mode: 3mm 512 Mbps Notes: Will use reference pointing. Schedule for VLBA_HN (Code Hn ) Page 2 3mm observations of 3C274 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). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Thu 19 Dec 2002 Day 353 --- Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 09 21 15 NRAO150 10 24 32 28.6 314.5 6.4 56.0 0 1 1 0 09 21 15 09 28 14 --- 10 31 32 27.7 315.2 6.5 55.0 419 F 1 5585 Next scan frequencies: 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 Next BBC frequencies: 743.71 743.71 743.71 743.71 743.71 743.71 743.71 743.71 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 09 36 12 P-RLEO 10 39 32 56.5 203.5 0.9 17.3 398 1 1 5585 09 36 12 09 39 12 --- 10 42 32 56.3 204.7 0.9 18.2 180 F 1 7978 Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 09 44 11 3C274 10 47 32 52.1 136.0 -1.7 -31.3 247 1 1 7978 09 44 11 09 56 09 --- 10 59 32 53.6 140.3 -1.5 -28.6 718 F 1 17552 10 09 07 3C279 11 12 32 35.9 147.5 -1.7 -23.3 736 1 2 17552 10 09 07 10 12 06 --- 11 15 32 36.2 148.4 -1.7 -22.7 180 R 1 15158 10 13 06 3C274 11 16 32 55.5 146.7 -1.2 -24.3 15 1 2 15158 10 13 06 10 32 03 --- 11 35 32 57.2 154.4 -0.9 -18.9 1137 R 1 0 Schedule for VLBA_HN (Code Hn ) Page 3 3mm observations of 3C274 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). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Thu 19 Dec 2002 Day 353 --- Next scan frequencies: 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 Next BBC frequencies: 743.71 743.71 743.71 743.71 743.71 743.71 743.71 743.71 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 10 45 01 P-RLEO 11 48 32 49.0 228.8 2.0 34.2 722 1 3 0 10 45 01 10 48 00 --- 11 51 32 48.6 229.7 2.1 34.7 180 F 1 2393 Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 10 53 00 3C274 11 56 32 58.5 163.7 -0.6 -12.1 249 1 3 2393 10 53 00 11 11 56 --- 12 15 32 59.3 172.6 -0.3 -5.5 1137 F 1 17552 11 24 54 3C279 12 28 32 40.9 170.8 -0.5 -6.7 735 1 4 17552 11 24 54 11 27 54 --- 12 31 32 40.9 171.8 -0.4 -6.0 180 R 1 15158 11 28 54 3C274 12 32 32 59.4 180.8 0.0 0.6 17 1 4 15158 11 28 54 11 47 51 --- 12 51 32 59.1 189.8 0.3 7.3 1137 R 1 0 Next scan frequencies: 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 Next BBC frequencies: 743.71 743.71 743.71 743.71 743.71 743.71 743.71 743.71 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 12 00 48 P-RLEO 13 04 32 37.1 248.6 3.3 44.0 728 1 5 0 12 00 48 12 03 48 --- 13 07 32 36.6 249.2 3.3 44.3 180 F 1 2393 Schedule for VLBA_HN (Code Hn ) Page 4 3mm observations of 3C274 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). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Thu 19 Dec 2002 Day 353 --- Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 12 08 47 3C274 13 12 32 58.1 199.5 0.7 14.5 250 1 5 2393 12 08 47 12 27 44 --- 13 31 32 56.7 207.7 1.0 20.4 1137 F 1 17552 Next scan frequencies: 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 Next BBC frequencies: 734.93 734.93 734.93 734.93 734.93 734.93 734.93 734.93 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 12 35 43 SIO-WHYA 13 39 32 18.7 177.8 -0.2 -1.9 396 1 6 17552 12 35 43 12 38 42 --- 13 42 32 18.7 178.5 -0.1 -1.3 180 R 1 15158 Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 12 43 41 3C274 13 47 32 55.2 214.2 1.3 24.9 220 1 6 15158 12 43 41 13 02 38 --- 14 06 32 53.1 221.2 1.6 29.6 1137 R 1 0 13 10 37 3C279 14 14 32 38.1 205.0 1.3 18.2 443 1 7 0 13 10 37 13 13 37 --- 14 17 32 37.9 205.9 1.4 18.8 180 F 1 2393 13 18 36 CEN-A 14 22 32 3.1 190.4 0.9 H 10.4 224 1 7 2393 13 18 36 13 27 34 --- 14 31 32 2.8 192.0 1.1 H 12.0 0 F 1 9574 13 32 33 3C274 14 36 32 49.1 231.1 2.1 35.7 200 1 7 9574 13 32 33 13 42 32 --- 14 46 32 47.7 234.0 2.3 37.3 598 F 1 17552 Schedule for VLBA_HN (Code Hn ) Page 5 3mm observations of 3C274 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). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Thu 19 Dec 2002 Day 353 --- Next scan frequencies: 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 Next BBC frequencies: 734.93 734.93 734.93 734.93 734.93 734.93 734.93 734.93 13 55 30 SIO-WHYA 14 59 32 16.9 196.1 1.2 13.4 710 1 8 17552 13 55 30 13 58 29 --- 15 02 32 16.7 196.8 1.2 13.9 180 R 1 15158 Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 13 59 29 CEN-A 15 03 32 1.3 197.6 1.6 D 17.7 25 1 8 15158 13 59 29 14 18 26 --- 15 22 32 0.1 200.9 1.9 D 20.9 0 R 1 0 14 26 25 3C279 15 30 32 30.0 225.8 2.6 31.8 417 1 9 0 14 26 25 14 29 24 --- 15 33 32 29.7 226.5 2.6 32.3 180 F 1 2393 14 30 24 3C274 15 34 32 40.1 246.4 3.1 43.4 33 1 9 2393 14 30 24 14 40 22 --- 15 44 32 38.4 248.7 3.2 44.3 598 F 1 10372 Next scan frequencies: 43103.49 43103.49 43119.49 43119.49 43135.49 43135.49 43151.49 43151.49 Next BBC frequencies: 703.49 703.49 719.49 719.49 735.49 735.49 751.49 751.49 14 45 21 CEN-A 15 49 32 -1.8 205.4 2.4 D 25.5 221 1 9 10372 14 45 21 14 54 20 --- 15 58 32 -2.5 206.9 2.5 D 27.0 0 F 1 17552 Next scan frequencies: 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 Next BBC frequencies: 743.71 743.71 743.71 743.71 743.71 743.71 743.71 743.71 15 07 18 P-RLEO 16 11 32 3.5 282.4 6.4 H 46.8 722 1 10 17552 15 07 18 15 10 17 --- 16 14 32 2.9 282.9 6.4 H 46.7 0 R 1 15158 Schedule for VLBA_HN (Code Hn ) Page 6 3mm observations of 3C274 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). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Thu 19 Dec 2002 Day 353 --- Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 15 15 17 3C274 16 19 32 32.3 256.0 3.8 46.7 234 1 10 15158 15 15 17 15 34 13 --- 16 38 32 28.9 259.7 4.1 47.5 1137 R 1 0 15 47 11 3C279 16 51 32 18.0 243.5 3.9 41.2 750 1 11 0 15 47 11 15 50 11 --- 16 54 32 17.5 244.0 4.0 41.4 180 F 1 2393 15 51 11 3C274 16 55 32 25.8 262.8 4.4 48.0 37 1 11 2393 15 51 11 16 10 08 --- 17 14 32 22.3 266.2 4.7 48.4 1137 F 1 17552 Next scan frequencies: 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 Next BBC frequencies: 743.71 743.71 743.71 743.71 743.71 743.71 743.71 743.71 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 16 23 05 P-RLEO 17 27 32 -9.7 295.6 7.7 D 42.3 732 1 12 17552 16 23 05 16 26 05 --- 17 30 32 -10.2 296.2 7.7 D 42.1 0 R 1 15158 Next scan frequencies: 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 Next BBC frequencies: 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16 31 04 3C274 17 35 32 18.5 269.9 5.1 48.6 261 1 12 15158 16 31 04 16 50 01 --- 17 54 32 15.0 273.1 5.4 48.5 1137 R 1 0 17 02 59 3C279 18 07 32 4.9 257.4 5.2 H 45.9 752 1 13 0 17 02 59 17 05 58 --- 18 10 32 4.3 257.9 5.2 H 46.0 0 F 1 2393 17 06 58 3C274 18 11 32 11.9 275.9 5.7 48.2 39 1 13 2393 17 06 58 17 25 55 --- 18 30 32 8.5 279.1 6.0 47.7 1137 F 1 17552 Schedule for VLBA_HN (Code Hn ) Page 7 3mm observations of 3C274 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). ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Thu 19 Dec 2002 Day 353 --- Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 17 43 52 1921-293 18 48 32 17.3 171.7 -0.6 -7.0 999 1 14 17552 17 43 52 18 05 49 --- 19 10 32 17.8 176.7 -0.2 -2.8 1316 R 1 0 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: br074b.set Matches group v3mm_a in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 1 Station: VLBA Total bit rate: 512 Format: VLBA1:4 Bits per sample: 2 Sample rate: 32.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 1.00 Tape speeds: Low density - 266.660 ips, High density - 160.00 ips Time per pass for 17600 ft, High density tapes is: 00:22:00 Two tape drives will be used. Required by this setup. 1st LO= 85500.00 85500.00 85500.00 85500.00 85500.00 85500.00 85500.00 85500.00 Net SB= U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U U U U U U U IF = B D B D B D B D VLBA FE= omit 3mm omit 3mm VLBA Synth= 14.1 15.4 11.9 The following frequency sets based on this setup were used. Frequency Set: 2 Setup file default. Used pcal sets: 2 LO sum= 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 BBC fr= 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Bandwd= 16.000 16.000 16.000 16.000 16.000 16.000 16.000 16.000 Frequency Set: 4 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 2 LO sum= 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 86243.71 BBC fr= 743.71 743.71 743.71 743.71 743.71 743.71 743.71 743.71 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 Frequency Set: 7 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 2 LO sum= 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 86234.93 BBC fr= 734.93 734.93 734.93 734.93 734.93 734.93 734.93 734.93 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 Frequency Set: 8 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 2 LO sum= 86217.49 86217.49 86233.49 86233.49 86249.49 86249.49 86265.49 86265.49 BBC fr= 717.49 717.49 733.49 733.49 749.49 749.49 765.49 765.49 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 2 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, 18, 3, 19, 66, 82, 67, 83 barrel=roll_auto Setup file: br074b7mm.set Matches group v7mm_c8 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 2 Station: VLBA Total bit rate: 512 Format: VLBA1:4 Bits per sample: 2 Sample rate: 32.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 1.00 Tape speeds: Low density - 266.660 ips, High density - 160.00 ips Time per pass for 17600 ft, High density tapes is: 00:22:00 Two tape drives will be used. Required by this setup. 1st LO= 42400.00 42400.00 42400.00 42400.00 42400.00 42400.00 42400.00 42400.00 Net SB= U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U U U U U U U IF = A C A C A C A C VLBA FE= 7mm omit 7mm omit VLBA Synth= 15.4 7.6 11.6 The following frequency sets based on this setup were used. Frequency Set: 10 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 2 LO sum= 43103.49 43103.49 43119.49 43119.49 43135.49 43135.49 43151.49 43151.49 BBC fr= 703.49 703.49 719.49 719.49 735.49 735.49 751.49 751.49 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 2 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, 18, 3, 19, 66, 82, 67, 83 barrel=roll_auto SOURCE LIST -- 3mm observations of 3C274 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) J0359+5057 03 55 45.261360 * 03 59 29.747261 03 59 43.484674 0355+508 50 49 20.28556 * 50 57 50.16151 50 58 27.01562 J0359+50 /home/filehost/cwalker/sched/catalogs/sources.vlba * NRAO150 ICRF - Ext.1 Source - 1998 IERS Annual Report J1229+0203 12 26 33.245833 * 12 29 06.699729 12 29 14.594138 1226+023 02 19 43.30569 * 02 03 08.59819 02 02 15.25074 * 3C273 /home/filehost/cwalker/sched/catalogs/sources.vlba 3C273B ICRF - Ext.1 Source - 1998 IERS Annual Report J1229+02 J1230+1223 12 28 17.569280 * 12 30 49.423382 12 30 57.248671 1228+126 12 40 01.74911 * 12 23 28.04393 12 22 31.05690 * 3C274 /home/filehost/cwalker/sched/catalogs/sources.vlba J1230+12 ICRF - Ext.1 Source - 1998 IERS Annual Report J1256-0547 12 53 35.831293 * 12 56 11.166560 12 56 18.977021 1253-055 -05 31 07.99572 *-05 47 21.52458 -05 48 11.29849 * 3C279 /home/filehost/cwalker/sched/catalogs/sources.vlba J1256-05 ICRF - Ext.1 Source - 1998 IERS Annual Report J1325-4301 13 22 31.606482 * 13 25 27.615166 13 25 36.024285 1322-427 -42 45 33.01728 *-43 01 08.80554 -43 01 45.97745 * CEN-A /home/filehost/cwalker/sched/catalogs/sources.vlba J1325-43 ICRF - Ext.1 Source - 1998 IERS Annual Report J1337-1257 13 34 59.803875 * 13 37 39.782780 13 37 47.573747 * 1334-127 -12 42 09.74296 *-12 57 24.69323 -12 58 09.65233 J1337-12 /home/filehost/cwalker/sched/catalogs/sources.vlba ICRF - Ext.1 Source - 1998 IERS Annual Report J1924-2914 19 21 42.234131 * 19 24 51.055958 19 24 59.618316 * 1921-293 -29 20 26.35405 *-29 14 30.12115 -29 14 17.34244 J1924-29 /home/filehost/cwalker/sched/catalogs/sources.vlba ICRF - Ext.1 Source - 1998 IERS Annual Report * P-TXCAM 04 56 41.340435 * 05 00 51.127000 05 01 06.726725 SIO-TXCAM 56 06 29.52902 * 56 10 53.98000 56 11 14.20360 TXCAM /home/filehost/cwalker/sched/catalogs/sources.pointing Baudry pos. * P-VYCMA 07 20 54.674751 * 07 22 58.270000 07 23 06.192995 SIO-VYCMA -25 40 12.69077 *-25 46 03.40000 -25 46 15.64630 VYCMASIO /home/filehost/cwalker/sched/catalogs/sources.pointing sest BW=4MHz * P-RLEO 09 44 52.219425 * 09 47 33.490000 09 47 42.771936 SIO-RLEO 11 39 40.09214 * 11 25 43.99000 11 24 57.93784 RLEO /home/filehost/cwalker/sched/catalogs/sources.pointing baudry pos, sest vel. * P-UHER 16 23 34.717051 * 16 25 47.520000 16 25 53.205241 SIO-UHER 19 00 17.57350 * 18 53 32.80000 18 53 06.88191 /home/filehost/cwalker/sched/catalogs/sources.pointing * P-VXSGR 18 05 02.981516 * 18 08 04.062000 18 08 12.155950 SIO-VXSGR -22 13 54.77916 *-22 13 26.10000 -22 13 27.32777 VXSGRSIO /home/filehost/cwalker/sched/catalogs/sources.pointing baudry pos, sest vel 2MHz BW * SIO-WHYA * 13 46 12.200000 13 49 02.211355 13 49 10.350983 WHYA *-28 07 07.00000 -28 22 00.78868 -28 22 40.33161 /home/filehost/cwalker/sched/catalogs/sources.pointing Not in P- list, but is used in startup pointing! 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) NRAO150 145.3 3C273 81.6 3C274 85.5 3C279 72.3 CEN-A 56.9 1334-127 60.1 1921-293 22.2 P-TXCAM 146.1 P-VYCMA 125.8 P-RLEO 122.2 P-UHER 46.9 P-VXSGR 4.6 SIO-WHYA 53.6 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