COVER INFORMATION Station: CAMBG32M (Code Cm ) Experiment: Snapshot Ionospheric Testing Observations Exp. Code: N05L2 Schedule Version: 1.20 Processed by SCHED version: 6.01 Release: Late March 2005 PI: James M Anderson Address: Joint Institute for VLBI in Europe Oude Hoogeveensedijk 4 7991 PD Dwingeloo The Netherlands Phone: +31 (0)521 596 542 EMAIL: anderson@jive.nl Fax: +31 (0)521 596 539 Phone during observation: +31 (0)521 596 500 Observing mode: Snapshot observations of sources at 18cm (256 Mb/s) Notes: ALBUS Ionospheric modeling test observations Fringe Finder is 3C273B, which is very strong Phase referencing is too fast for JODRELL1 All targets are strong Schedule for CAMBG32M (Code Cm ) Page 2 Snapshot Ionospheric Testing Observations 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 2 Jun 2005 Day 153 --- Next scan frequencies: 1637.99 1637.99 1645.99 1645.99 1653.99 1653.99 1661.99 1661.99 Next BBC frequencies: 527.99 527.99 535.99 535.99 543.99 543.99 551.99 551.99 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 16 00 00 3C273B 08 45 02 21.7 476.8 -3.7 -33.2 0 1 1 0 16 00 00 16 05 20 --- 08 50 23 22.4 478.0 -3.7 -32.8 320 F 1 0 16 08 20 J1215-1731 08 53 23 7.6 491.9 -3.4 -28.6 111 1 1 0 16 08 20 16 09 20 =1213-172 08 54 23 7.7 492.1 -3.4 -28.5 60 F 1 0 16 09 20 J1212-2221 08 54 23 3.9 495.2 -3.3 -27.9 -36 1 1 0 16 09 20 16 11 00 =1209-220 08 56 04 4.0 495.6 -3.3 -27.7 64 F 1 0 16 11 00 J1215-1731 08 56 04 7.9 492.5 -3.3 -28.3 -36 1 1 0 16 11 00 16 12 40 =1213-172 08 57 44 8.1 492.8 -3.3 -28.1 64 F 1 0 16 12 40 J1212-2221 08 57 44 4.2 495.9 -3.2 -27.5 -36 1 1 0 16 12 40 16 14 20 =1209-220 08 59 24 4.4 496.2 -3.2 -27.3 64 F 1 0 16 14 20 J1215-1731 08 59 24 8.3 493.2 -3.3 -28.0 -36 1 1 0 16 14 20 16 16 00 =1213-172 09 01 05 8.5 493.6 -3.2 -27.8 64 F 1 0 16 16 00 J1159-2148 09 01 05 6.3 498.9 -3.0 -25.8 -39 1 1 0 16 16 00 16 18 00 =1157-215 09 03 05 6.5 499.3 -3.0 -25.5 81 F 1 0 16 18 00 J1215-1731 09 03 05 8.7 494.0 -3.2 -27.6 -39 1 1 0 16 18 00 16 20 00 =1213-172 09 05 05 8.9 494.4 -3.2 -27.4 81 F 1 0 16 20 00 J1159-2148 09 05 05 6.7 499.7 -2.9 -25.3 -39 1 1 0 16 20 00 16 22 00 =1157-215 09 07 06 6.9 500.1 -2.9 -25.1 81 F 1 0 16 22 00 J1215-1731 09 07 06 9.1 494.8 -3.1 -27.1 -39 1 1 0 16 22 00 16 24 00 =1213-172 09 09 06 9.3 495.3 -3.1 -26.9 81 F 1 0 16 25 00 J1159-2148 09 10 06 7.2 500.8 -2.8 -24.7 21 1 1 0 16 25 00 16 26 00 =1157-215 09 11 06 7.3 501.0 -2.8 -24.6 60 F 1 0 16 26 00 J1212-2221 09 11 06 5.6 498.7 -3.0 -26.0 -29 1 1 0 16 26 00 16 27 40 =1209-220 09 12 47 5.8 499.0 -3.0 -25.8 71 F 1 0 Schedule for CAMBG32M (Code Cm ) Page 3 Snapshot Ionospheric Testing Observations 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 2 Jun 2005 Day 153 --- 16 27 40 J1159-2148 09 12 47 7.5 501.4 -2.8 -24.4 -29 1 1 0 16 27 40 16 29 20 =1157-215 09 14 27 7.6 501.7 -2.8 -24.2 71 F 1 0 16 29 20 J1212-2221 09 14 27 6.0 499.4 -3.0 -25.6 -29 1 1 0 16 29 20 16 31 00 =1209-220 09 16 07 6.1 499.7 -2.9 -25.4 71 F 1 0 16 31 00 J1159-2148 09 16 07 7.8 502.1 -2.7 -24.0 -29 1 1 0 16 31 00 16 32 40 =1157-215 09 17 47 8.0 502.4 -2.7 -23.8 71 F 1 0 16 32 40 J1212-2221 09 17 47 6.3 500.1 -2.9 -25.2 -29 1 1 0 16 32 40 16 34 20 =1209-220 09 19 28 6.4 500.4 -2.9 -25.0 71 F 1 0 16 34 20 J1159-2148 09 19 28 8.1 502.8 -2.7 -23.6 -29 1 1 0 16 34 20 16 36 00 =1157-215 09 21 08 8.3 503.1 -2.7 -23.3 71 F 1 0 16 36 00 J1159-2228 09 21 08 7.7 503.6 -2.6 -23.2 -20 1 1 0 16 36 00 16 37 40 =1156-221 09 22 48 7.9 503.9 -2.6 -23.0 80 F 1 0 16 37 40 J1159-2148 09 22 48 8.4 503.5 -2.6 -23.1 -20 1 1 0 16 37 40 16 39 20 =1157-215 09 24 28 8.6 503.9 -2.6 -22.9 80 F 1 0 16 39 20 J1159-2228 09 24 28 8.0 504.3 -2.6 -22.8 -20 1 1 0 16 39 20 16 41 00 =1156-221 09 26 09 8.2 504.6 -2.6 -22.6 80 F 1 0 16 41 00 J1159-2148 09 26 09 8.7 504.2 -2.6 -22.7 -20 1 1 0 16 41 00 16 42 40 =1157-215 09 27 49 8.9 504.6 -2.5 -22.5 80 F 1 0 16 42 40 J1159-2228 09 27 49 8.3 505.0 -2.5 -22.4 -20 1 1 0 16 42 40 16 44 20 =1156-221 09 29 29 8.5 505.4 -2.5 -22.2 80 F 1 0 16 44 20 J1159-2148 09 29 29 9.0 505.0 -2.5 -22.3 -20 1 1 0 16 44 20 16 46 00 =1157-215 09 31 10 9.2 505.3 -2.5 -22.1 80 F 1 0 16 47 40 3C273B 09 32 50 27.9 488.1 -2.9 -28.9 19 1 1 0 16 47 40 16 55 40 --- 09 40 51 28.8 490.1 -2.8 -28.0 480 F 1 0 16 58 40 J1224+0330 09 43 52 31.0 491.1 -2.7 -27.6 151 1 1 0 16 58 40 16 59 40 =1222+037 09 44 52 31.1 491.4 -2.7 -27.5 60 F 1 0 16 59 40 J1222+0413 09 44 52 32.0 491.6 -2.6 -27.4 -23 1 1 0 16 59 40 17 01 20 =1219+044 09 46 32 32.2 492.1 -2.6 -27.2 77 F 1 0 17 01 20 J1224+0330 09 46 32 31.3 491.8 -2.6 -27.3 -23 1 1 0 17 01 20 17 03 00 =1222+037 09 48 12 31.5 492.2 -2.6 -27.1 77 F 1 0 Schedule for CAMBG32M (Code Cm ) Page 4 Snapshot Ionospheric Testing Observations 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 2 Jun 2005 Day 153 --- 17 03 00 J1222+0413 09 48 12 32.4 492.5 -2.6 -27.0 -23 1 1 0 17 03 00 17 04 40 =1219+044 09 49 53 32.6 493.0 -2.5 -26.7 77 F 1 0 17 04 40 J1224+0330 09 49 53 31.7 492.7 -2.6 -26.9 -23 1 1 0 17 04 40 17 06 20 =1222+037 09 51 33 31.9 493.1 -2.6 -26.7 77 F 1 0 17 06 20 J1222+0413 09 51 33 32.8 493.4 -2.5 -26.5 -23 1 1 0 17 06 20 17 08 00 =1219+044 09 53 13 33.0 493.8 -2.5 -26.3 77 F 1 0 17 08 00 J1224+0330 09 53 13 32.0 493.6 -2.5 -26.4 -23 1 1 0 17 08 00 17 09 40 =1222+037 09 54 53 32.2 494.0 -2.5 -26.2 77 F 1 0 17 09 40 J1218-0119 09 54 53 28.5 498.0 -2.4 -24.2 -36 1 1 0 17 09 40 17 11 20 =1216-010 09 56 34 28.7 498.5 -2.4 -24.0 64 F 1 0 17 11 20 J1224+0330 09 56 34 32.4 494.4 -2.5 -26.0 -36 1 1 0 17 11 20 17 13 00 =1222+037 09 58 14 32.6 494.9 -2.4 -25.8 64 F 1 0 17 13 00 J1218-0119 09 58 14 28.9 498.9 -2.3 -23.8 -36 1 1 0 17 13 00 17 14 40 =1216-010 09 59 54 29.0 499.3 -2.3 -23.6 64 F 1 0 17 14 40 J1224+0330 09 59 54 32.8 495.3 -2.4 -25.6 -36 1 1 0 17 14 40 17 16 20 =1222+037 10 01 35 33.0 495.8 -2.4 -25.4 64 F 1 0 17 20 40 J1636+2112 10 05 55 12.0 430.8 -6.5 -38.4 127 1 1 0 17 20 40 17 21 40 =1634+213 10 06 55 12.2 431.0 -6.5 -38.5 60 F 1 0 17 21 40 J1644+1813 10 06 55 8.6 431.3 -6.6 -37.7 -35 1 1 0 17 21 40 17 23 20 =1642+183 10 08 36 8.9 431.7 -6.6 -37.8 65 F 1 0 17 23 20 J1636+2112 10 08 36 12.4 431.3 -6.5 -38.6 -35 1 1 0 17 23 20 17 25 00 =1634+213 10 10 16 12.7 431.6 -6.4 -38.6 65 F 1 0 17 25 00 J1644+1813 10 10 16 9.1 432.0 -6.6 -37.9 -35 1 1 0 17 25 00 17 26 40 =1642+183 10 11 56 9.4 432.3 -6.6 -38.0 65 F 1 0 17 26 40 J1636+2112 10 11 56 12.9 432.0 -6.4 -38.7 -35 1 1 0 17 26 40 17 28 20 =1634+213 10 13 36 13.2 432.3 -6.4 -38.8 65 F 1 0 17 28 20 J1644+1813 10 13 36 9.6 432.6 -6.5 -38.0 -35 1 1 0 17 28 20 17 30 00 =1642+183 10 15 17 9.9 432.9 -6.5 -38.1 65 F 1 0 17 30 00 J1636+2112 10 15 17 13.4 432.6 -6.4 -38.9 -35 1 1 0 17 30 00 17 31 40 =1634+213 10 16 57 13.6 432.9 -6.3 -39.0 65 F 1 0 Schedule for CAMBG32M (Code Cm ) Page 5 Snapshot Ionospheric Testing Observations 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 2 Jun 2005 Day 153 --- 17 31 40 J1641+2257 10 16 57 14.3 430.9 -6.4 -39.0 -28 1 1 0 17 31 40 17 33 20 =1639+230 10 18 37 14.5 431.2 -6.4 -39.1 72 F 1 0 17 33 20 J1636+2112 10 18 37 13.9 433.2 -6.3 -39.0 -28 1 1 0 17 33 20 17 35 00 =1634+213 10 20 18 14.1 433.5 -6.3 -39.1 72 F 1 0 17 35 00 J1641+2257 10 20 18 14.8 431.5 -6.4 -39.2 -28 1 1 0 17 35 00 17 36 40 =1639+230 10 21 58 15.0 431.8 -6.3 -39.3 72 F 1 0 17 36 40 J1636+2112 10 21 58 14.4 433.8 -6.2 -39.2 -28 1 1 0 17 36 40 17 38 20 =1634+213 10 23 38 14.6 434.1 -6.2 -39.3 72 F 1 0 17 38 20 J1641+2257 10 23 38 15.3 432.1 -6.3 -39.3 -28 1 1 0 17 38 20 17 40 00 =1639+230 10 25 18 15.5 432.4 -6.3 -39.4 72 F 1 0 17 41 00 J1636+2112 10 26 19 15.0 434.6 -6.2 -39.4 32 1 1 0 17 41 00 17 41 40 =1634+213 10 26 59 15.1 434.8 -6.2 -39.4 40 F 1 0 17 41 40 J1642+2523 10 26 59 17.5 430.9 -6.3 -39.9 -34 1 1 0 17 41 40 17 43 20 =1640+254 10 28 39 17.7 431.2 -6.2 -40.0 66 F 1 0 17 43 20 J1636+2112 10 28 39 15.4 435.1 -6.1 -39.5 -34 1 1 0 17 43 20 17 45 00 =1634+213 10 30 19 15.6 435.4 -6.1 -39.5 66 F 1 0 17 45 00 J1642+2523 10 30 19 17.9 431.5 -6.2 -40.1 -34 1 1 0 17 45 00 17 46 40 =1640+254 10 31 59 18.2 431.8 -6.2 -40.2 66 F 1 0 17 46 40 J1636+2112 10 31 59 15.9 435.7 -6.1 -39.6 -35 1 1 0 17 46 40 17 48 20 =1634+213 10 33 40 16.1 436.0 -6.1 -39.7 65 F 1 0 17 48 20 J1642+2523 10 33 40 18.4 432.1 -6.2 -40.2 -35 1 1 0 17 48 20 17 50 00 =1640+254 10 35 20 18.7 432.4 -6.1 -40.3 65 F 1 0 17 50 00 J1636+2112 10 35 20 16.4 436.3 -6.0 -39.7 -35 1 1 0 17 50 00 17 51 40 =1634+213 10 37 00 16.6 436.6 -6.0 -39.8 65 F 1 0 17 51 40 J1642+2523 10 37 00 18.9 432.7 -6.1 -40.4 -35 1 1 0 17 51 40 17 53 20 =1640+254 10 38 41 19.2 433.0 -6.1 -40.5 65 F 1 0 17 53 20 J1644+1813 10 38 41 13.3 437.4 -6.1 -39.1 -42 1 1 0 17 53 20 17 55 00 =1642+183 10 40 21 13.6 437.7 -6.1 -39.1 58 F 1 0 17 55 00 J1642+2523 10 40 21 19.4 433.3 -6.0 -40.6 -42 1 1 0 17 55 00 17 56 40 =1640+254 10 42 01 19.6 433.6 -6.0 -40.6 58 F 1 0 Schedule for CAMBG32M (Code Cm ) Page 6 Snapshot Ionospheric Testing Observations 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 2 Jun 2005 Day 153 --- 17 56 40 J1644+1813 10 42 01 13.8 438.0 -6.1 -39.2 -42 1 1 0 17 56 40 17 58 20 =1642+183 10 43 41 14.1 438.3 -6.0 -39.2 58 F 1 0 17 58 20 J1642+2523 10 43 41 19.9 433.9 -6.0 -40.7 -42 1 1 0 17 58 20 18 00 00 =1640+254 10 45 22 20.1 434.2 -6.0 -40.8 58 F 1 0 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: eo999.18cm Matches group cm18cm in /aps3/sched/catalogs/freq.dat Confirmed by Alastair Gunn 31 Jan 2005 Setup group: 10 Station: CAMBG32M Total bit rate: 256 Format: MKIV1:2 Bits per sample: 2 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 1.00 1st LO= 1110.00 1110.00 1110.00 1110.00 1110.00 1110.00 1110.00 1110.00 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 = C A C A C A C A The following frequency sets based on this setup were used. Frequency Set: 10 Setup file default. Used pcal sets: 1 LO sum= 1637.99 1637.99 1645.99 1645.99 1653.99 1653.99 1661.99 1661.99 BBC fr= 527.99 527.99 535.99 535.99 543.99 543.99 551.99 551.99 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= 10 10 10 10 6010 6010 6010 6010 PCALFR2= 10 10 10 10 6010 6010 6010 6010 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_off SOURCE LIST -- Snapshot Ionospheric Testing Observations 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) * J1159-2148 11 57 18.309811 * 11 59 51.906111 12 00 08.364401 0.27 1157-215 -21 32 11.49992 *-21 48 53.70757 -21 50 49.17241 0.78 J1159-21 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.250 scan hours, 8.429 baseline hours above horizon. * J1159-2228 11 56 37.757633 * 11 59 11.267254 11 59 27.707413 0.35 1156-221 -22 11 54.71372 *-22 28 36.90237 -22 30 32.54328 0.94 J1159-22 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.083 scan hours, 2.594 baseline hours above horizon. * J1212-2221 12 09 28.653794 * 12 12 03.697609 12 12 20.379490 0.31 1209-220 -22 05 10.38854 *-22 21 51.51342 -22 23 47.29736 0.86 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.139 scan hours, 3.385 baseline hours above horizon. * J1215-1731 12 13 11.668001 * 12 15 46.751756 12 16 03.492656 0.21 1213-172 -17 15 05.20060 *-17 31 45.40297 -17 33 39.75883 0.31 J1215-17 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.139 scan hours, 5.260 baseline hours above horizon. * J1218-0119 12 16 01.062434 * 12 18 34.929793 12 18 51.681004 0.28 1216-010 -01 03 15.08668 *-01 19 54.34138 -01 21 43.60871 0.52 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.056 scan hours, 1.312 baseline hours above horizon. * J1222+0413 12 19 49.255029 * 12 22 22.549619 12 22 39.310892 0.30 1219+044 04 29 53.60837 * 04 13 15.77616 04 11 28.33343 0.20 J1222+04 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.083 scan hours, 3.206 baseline hours above horizon. * J1224+0330 12 22 19.097168 * 12 24 52.421934 12 25 09.193350 0.31 1222+037 03 47 27.06610 * 03 30 50.29295 03 29 02.64562 0.24 J1224+03 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.156 scan hours, 6.701 baseline hours above horizon. J1229+0203 12 26 33.245835 * 12 29 06.699731 12 29 23.494262 0.30 1226+023 02 19 43.30564 * 02 03 08.59814 02 01 20.55370 0.20 3C273 /aps3/sched/catalogs/sources.vlba * 3C273B VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro J1229+02 0.222 scan hours, 12.119 baseline hours above horizon. * J1636+2112 16 34 28.653965 * 16 36 38.183456 16 36 53.384673 0.32 1634+213 21 18 56.44171 * 21 12 55.59502 21 12 08.41352 0.49 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.250 scan hours, 9.638 baseline hours above horizon. * J1641+2257 16 39 18.102927 * 16 41 25.227565 16 41 40.195915 0.24 1639+230 23 02 45.20241 * 22 57 04.03274 22 56 18.77175 0.43 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.083 scan hours, 2.867 baseline hours above horizon. * J1642+2523 16 40 36.555202 * 16 42 40.411845 16 42 55.070604 0.32 1640+254 25 28 43.57693 * 25 23 07.68189 25 22 22.98514 0.55 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.167 scan hours, 5.537 baseline hours above horizon. * J1644+1813 16 42 39.489851 * 16 44 52.432452 16 45 07.953357 0.84 1642+183 18 18 44.38577 * 18 13 17.23767 18 12 33.20535 1.82 /aps3/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.139 scan hours, 3.457 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) J1159-2148 115.1 J1159-2228 115.1 J1212-2221 118.0 J1215-1731 117.5 J1218-0119 112.6 J1222+0413 111.1 J1224+0330 112.0 3C273B 113.6 J1636+2112 136.5 J1641+2257 134.8 J1642+2523 132.4 J1644+1813 139.5 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