COVER INFORMATION Station: VLBA_BR (Code Br ) Experiment: VLBA Monitoring Exp. Code: TR017K Schedule Version: 2.10 Processed by SCHED version: Release of 02 July 2002 PI: Lorant Sjouwerman Address: NRAO-AOC P.O.Box O Socorro NM 87801, U.S.A. Phone: +1-505-838-4507 (home) EMAIL: lsjouwerman@aoc.nrao.edu Fax: Phone during observation: +1-505-835-7332 (work) Observing mode: VLBA 128MHz 8bbc 1bit R+L Notes: VLBA Monitoring test in dynamic scheduling Note: MAKE SURE ONE SOURCE IS SELECTED COVER LETTER: Please schedule ONE source depending on between approximately -3h to +3h of LST in Pie Town; a source can be selected by deleting the -one and only- ONE explanation mark in front of it. Schedule for VLBA_BR (Code Br ) Page 2 VLBA Monitoring 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) ---------------------------------------------------------------------------------------- --- Thu 10 Apr 2003 Day 100 --- Next scan frequencies: 314.49 314.49 322.49 322.49 330.49 330.49 338.49 338.49 Next BBC frequencies: 814.49 814.49 822.49 822.49 830.49 830.49 838.49 838.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 13 58 55 2145+067 19 13 45 37.4 128.7 -2.6 -31.6 0 1 1 0 13 58 55 14 07 53 --- 19 22 45 38.6 131.1 -2.4 -30.4 539 F 1 3590 Next scan frequencies: 594.98 594.98 602.98 602.98 610.98 610.98 618.98 618.98 Next BBC frequencies: 594.98 594.98 602.98 602.98 610.98 610.98 618.98 618.98 14 09 53 2145+067 19 24 45 38.8 131.7 -2.4 -30.1 113 1 1 3590 14 09 53 14 14 52 --- 19 29 45 39.5 133.1 -2.3 -29.4 299 F 1 5585 Next scan frequencies: 1400.49 1400.49 1408.49 1408.49 1416.49 1416.49 1424.49 1424.49 Next BBC frequencies: 999.51 999.51 991.51 991.51 983.51 983.51 975.51 975.51 14 14 52 2145+067 19 29 45 39.5 133.1 -2.3 -29.4 -6 1 1 5585 14 14 52 14 19 51 --- 19 34 45 40.1 134.5 -2.2 -28.7 293 F 1 7579 Next scan frequencies: 1642.49 1642.49 1650.49 1650.49 1658.49 1658.49 1666.49 1666.49 Next BBC frequencies: 757.51 757.51 749.51 749.51 741.51 741.51 733.51 733.51 14 19 51 2145+067 19 34 45 40.1 134.5 -2.2 -28.7 -6 1 1 7579 14 19 51 14 24 51 --- 19 39 45 40.7 135.9 -2.1 -27.9 293 F 1 9574 Next scan frequencies: 2279.49 2279.49 2287.49 2287.49 2295.49 2295.49 2303.49 2303.49 Next BBC frequencies: 820.51 820.51 812.51 812.51 804.51 804.51 796.51 796.51 14 24 51 2145+067 19 39 45 40.7 135.9 -2.1 -27.9 -6 1 1 9574 14 24 51 14 29 50 --- 19 44 45 41.2 137.4 -2.1 -27.1 293 F 1 11568 Schedule for VLBA_BR (Code Br ) Page 3 VLBA Monitoring 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) ---------------------------------------------------------------------------------------- --- Thu 10 Apr 2003 Day 100 --- Next scan frequencies: 4974.49 4974.49 4982.49 4982.49 4990.49 4990.49 4998.49 4998.49 Next BBC frequencies: 874.49 874.49 882.49 882.49 890.49 890.49 898.49 898.49 14 31 49 2145+067 19 46 45 41.4 138.0 -2.0 -26.8 113 1 1 11568 14 31 49 14 36 49 --- 19 51 45 42.0 139.5 -1.9 -25.9 299 F 1 13563 Next scan frequencies: 8399.49 8399.49 8407.49 8407.49 8415.49 8415.49 8423.49 8423.49 Next BBC frequencies: 799.49 799.49 807.49 807.49 815.49 815.49 823.49 823.49 14 36 49 2145+067 19 51 45 42.0 139.5 -1.9 -25.9 -6 1 1 13563 14 36 49 14 41 48 --- 19 56 45 42.5 141.0 -1.9 -25.1 293 F 1 15557 Next scan frequencies: 15269.49 15269.49 15277.49 15277.49 15285.49 15285.49 15293.49 15293.49 Next BBC frequencies: 669.49 669.49 677.49 677.49 685.49 685.49 693.49 693.49 14 41 48 2145+067 19 56 45 42.5 141.0 -1.9 -25.1 -6 1 1 15557 14 41 48 14 46 47 --- 20 01 45 43.1 142.5 -1.8 -24.2 293 F 1 17552 Next scan frequencies: 22219.49 22219.49 22227.49 22227.49 22235.49 22235.49 22243.49 22243.49 Next BBC frequencies: 719.49 719.49 727.49 727.49 735.49 735.49 743.49 743.49 14 46 47 2145+067 20 01 45 43.1 142.5 -1.8 -24.2 -6 1 2 17552 14 46 47 14 51 46 --- 20 06 45 43.5 144.1 -1.7 -23.2 293 R 1 15557 Next scan frequencies: 43119.49 43119.49 43127.49 43127.49 43135.49 43135.49 43143.49 43143.49 Next BBC frequencies: 719.49 719.49 727.49 727.49 735.49 735.49 743.49 743.49 14 53 46 2145+067 20 08 45 43.7 144.7 -1.7 -22.9 113 1 2 15557 14 53 46 14 58 45 --- 20 13 45 44.2 146.3 -1.6 -21.9 299 R 1 13563 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: band.90cm Matches group v5090n in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 1 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= -500.00 -500.00 -500.00 -500.00 -500.00 -500.00 -500.00 -500.00 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 90cm omit 90cm VLBA Synth= 15.4 15.4 15.4 The following frequency sets based on this setup were used. Frequency Set: 1 Setup file default. Used pcal sets: 1 LO sum= 314.49 314.49 322.49 322.49 330.49 330.49 338.49 338.49 BBC fr= 814.49 814.49 822.49 822.49 830.49 830.49 838.49 838.49 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_auto Setup file: band.50cm Matches group v5090w in /home/filehost/cwalker/sched/catalogs/freq.dat Wide 50 cm filter. Beware RFI. Some stations will saturate. Setup group: 2 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 90cm omit 90cm VLBA Synth= 15.4 15.4 15.4 The following frequency sets based on this setup were used. Frequency Set: 2 Setup file default. Used pcal sets: 2 LO sum= 594.98 594.98 602.98 602.98 610.98 610.98 618.98 618.98 BBC fr= 594.98 594.98 602.98 602.98 610.98 610.98 618.98 618.98 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 = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 20 20 20 20 6020 6020 6020 6020 PCALFR2= 20 20 20 20 6020 6020 6020 6020 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_16 Setup file: band.21cm Matches group v20cm_2 in /home/filehost/cwalker/sched/catalogs/freq.dat FD filtered above 1760. SC filtered above 1740. Setup group: 3 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 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= L L L L L L L L 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: 3 Setup file default. Used pcal sets: 1 LO sum= 1400.49 1400.49 1408.49 1408.49 1416.49 1416.49 1424.49 1424.49 BBC fr= 999.51 999.51 991.51 991.51 983.51 983.51 975.51 975.51 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_8 Setup file: band.18cm Matches group v20cm_2 in /home/filehost/cwalker/sched/catalogs/freq.dat FD filtered above 1760. SC filtered above 1740. Setup group: 4 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 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= L L L L L L L L 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: 4 Setup file default. Used pcal sets: 1 LO sum= 1642.49 1642.49 1650.49 1650.49 1658.49 1658.49 1666.49 1666.49 BBC fr= 757.51 757.51 749.51 749.51 741.51 741.51 733.51 733.51 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_off Setup file: band.13cm Matches group v13cm_2 in /home/filehost/cwalker/sched/catalogs/freq.dat LA,NL only 2200-2400 Setup group: 5 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 3100.00 3100.00 3100.00 3100.00 3100.00 3100.00 3100.00 3100.00 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= L L L L L L L L IF = A C A C A C A C VLBA FE= 13cm omit 13cm omit VLBA Synth= 15.4 3.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 5 Setup file default. Used pcal sets: 1 LO sum= 2279.49 2279.49 2287.49 2287.49 2295.49 2295.49 2303.49 2303.49 BBC fr= 820.51 820.51 812.51 812.51 804.51 804.51 796.51 796.51 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_8 Setup file: band.6cm Matches group v6cm_2 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 6 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 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= 6cm omit 6cm omit VLBA Synth= 15.4 4.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 6 Setup file default. Used pcal sets: 1 LO sum= 4974.49 4974.49 4982.49 4982.49 4990.49 4990.49 4998.49 4998.49 BBC fr= 874.49 874.49 882.49 882.49 890.49 890.49 898.49 898.49 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_16 Setup file: band.4cm Matches group v4cm_3 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 7 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 7600.00 7600.00 7600.00 7600.00 7600.00 7600.00 7600.00 7600.00 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 4cm omit 4cm VLBA Synth= 7.6 15.4 15.4 The following frequency sets based on this setup were used. Frequency Set: 7 Setup file default. Used pcal sets: 1 LO sum= 8399.49 8399.49 8407.49 8407.49 8415.49 8415.49 8423.49 8423.49 BBC fr= 799.49 799.49 807.49 807.49 815.49 815.49 823.49 823.49 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_off Setup file: band.2cm Matches group v2cm_d3 in /home/filehost/cwalker/sched/catalogs/freq.dat Fourth 2cm filter Setup group: 8 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 14600.00 14600.00 14600.00 14600.00 14600.00 14600.00 14600.00 14600.00 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 2cm omit 2cm VLBA Synth= 14.6 10.9 10.9 The following frequency sets based on this setup were used. Frequency Set: 8 Setup file default. Used pcal sets: 1 LO sum= 15269.49 15269.49 15277.49 15277.49 15285.49 15285.49 15293.49 15293.49 BBC fr= 669.49 669.49 677.49 677.49 685.49 685.49 693.49 693.49 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_auto Setup file: band.1cm Matches group v1cm_b3 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 9 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 21500.00 21500.00 21500.00 21500.00 21500.00 21500.00 21500.00 21500.00 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 1cm omit 1cm VLBA Synth= 9.1 15.4 12.4 The following frequency sets based on this setup were used. Frequency Set: 9 Setup file default. Used pcal sets: 1 LO sum= 22219.49 22219.49 22227.49 22227.49 22235.49 22235.49 22243.49 22243.49 BBC fr= 719.49 719.49 727.49 727.49 735.49 735.49 743.49 743.49 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_16 Setup file: band.7mm Matches group v7mm_c8 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 10 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 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 Setup file default. Used pcal sets: 1 LO sum= 43119.49 43119.49 43127.49 43127.49 43135.49 43135.49 43143.49 43143.49 BBC fr= 719.49 719.49 727.49 727.49 735.49 735.49 743.49 743.49 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: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_8 SOURCE LIST -- VLBA Monitoring 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) J2148+0657 21 45 36.078481 * 21 48 05.458679 21 48 13.520482 * 2145+067 06 43 40.90462 * 06 57 38.60422 06 58 16.36342 J2148+06 /home/filehost/cwalker/sched/catalogs/sources.vlba ICRF - Ext.1 Source - 1998 IERS Annual Report 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) 2145+067 51.2 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