COVER INFORMATION Station: VLBA_OV (Code Ov ) Experiment: Global 7mm VLBI observations of Cygnus A Exp. Code: gb075b Schedule Version: 1.00 Processed by SCHED version: 11.30 Version 11.3 update 1. April 14, 2014 PI: Biagina Boccardi Address: Max Planck Institute for Radioastronomy Auf dem Huegel 69 Bonn, 53121 Germany Phone: +49 (0)228 525 366 EMAIL: bboccardi@mpifr-bonn.mpg.de Fax: +49-2257-301-106 Phone during observation: +49-2257-301-155 Observing mode: 1024-32-2 Notes: COVER LETTER: Schedule for VLBA_OV (Code Ov ) Page 2 Global 7mm VLBI observations of Cygnus A UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sun 19 Oct 2014 Day 292 --- Next scan frequencies: 43114.25 43114.25 43146.25 43146.25 43178.25 43178.25 43210.25 43210.25 Next BBC frequencies: 714.25 714.25 746.25 746.25 778.25 778.25 810.25 810.25 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 19 22 00 CYG-A 13 21 38 17.1 51.4 -6.6 -55.2 0 0 19 22 00 19 28 00 --- 13 27 39 18.1 52.1 -6.5 -56.0 360 46 19 22 01 19 30 00 CYG-A 13 29 40 18.4 52.3 -6.5 -56.3 114 46 19 30 00 19 35 00 --- 13 34 41 19.2 52.8 -6.4 -56.9 300 85 19 30 01 19 42 00 CYG-A 13 41 42 20.3 53.6 -6.3 -57.8 414 85 19 42 00 19 57 00 --- 13 56 44 22.7 55.2 -6.1 -59.7 900 201 19 42 01 19 59 00 2013+370 13 58 45 18.6 56.9 -6.3 -56.9 103 201 19 59 00 20 02 00 --- 14 01 45 19.1 57.2 -6.2 -57.2 180 224 19 59 01 20 23 00 2013+370 14 22 48 22.6 59.6 -5.9 -59.6 1253 224 20 23 00 20 26 00 --- 14 25 49 23.2 59.9 -5.8 -59.9 180 247 20 23 01 20 27 00 CYG-A 14 26 49 27.7 58.2 -5.6 -63.3 43 247 20 27 00 20 42 00 --- 14 41 52 30.3 59.6 -5.3 -65.1 900 363 20 27 01 20 43 00 CYG-A 14 42 52 30.5 59.7 -5.3 -65.2 54 363 20 43 00 20 46 00 --- 14 45 52 31.0 60.0 -5.2 -65.6 180 386 20 43 01 20 47 00 2013+370 14 46 52 26.8 62.1 -5.5 -62.1 43 386 20 47 00 20 50 00 --- 14 49 53 27.3 62.4 -5.4 -62.5 180 410 20 47 01 20 51 00 CYG-A 14 50 53 31.9 60.4 -5.2 -66.1 43 410 20 51 00 21 06 00 --- 15 05 56 34.5 61.8 -4.9 -67.9 900 526 20 51 01 21 08 00 CYG-A 15 07 56 34.8 61.9 -4.9 -68.1 114 526 21 08 00 21 13 00 --- 15 12 57 35.7 62.4 -4.8 -68.7 300 564 21 08 01 21 15 00 2013+370 15 14 57 31.8 65.0 -5.0 -65.0 103 564 21 15 00 21 18 00 --- 15 17 57 32.4 65.3 -5.0 -65.3 180 587 21 15 01 21 19 00 CYG-A 15 18 58 36.8 62.9 -4.7 -69.3 43 587 21 19 00 21 34 00 --- 15 34 00 39.5 64.1 -4.4 -71.0 900 703 21 19 01 21 35 00 CYG-A 15 35 00 39.6 64.2 -4.4 -71.2 54 703 21 35 00 21 39 00 --- 15 39 01 40.4 64.5 -4.3 -71.6 240 734 21 35 01 21 40 00 CYG-A 15 40 01 40.5 64.6 -4.3 -71.7 54 734 21 40 00 21 46 00 --- 15 46 02 41.6 65.0 -4.2 -72.4 360 781 21 40 01 Schedule for VLBA_OV (Code Ov ) Page 3 Global 7mm VLBI observations of Cygnus A UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sun 19 Oct 2014 Day 292 --- 21 47 00 2013+370 15 47 02 37.7 68.1 -4.5 -68.1 44 781 21 47 00 21 50 00 --- 15 50 03 38.2 68.4 -4.4 -68.4 180 804 21 47 01 21 51 00 CYG-A 15 51 03 42.5 65.4 -4.1 -73.0 43 804 21 51 00 22 06 00 --- 16 06 05 45.3 66.5 -3.9 -74.7 900 920 21 51 01 22 07 00 CYG-A 16 07 06 45.5 66.6 -3.9 -74.8 54 920 22 07 00 22 12 00 --- 16 12 06 46.4 66.9 -3.8 -75.3 300 958 22 07 01 22 14 00 CYG-A 16 14 07 46.7 67.1 -3.8 -75.6 114 958 22 14 00 22 18 00 --- 16 18 07 47.5 67.3 -3.7 -76.0 240 989 22 14 01 22 21 00 BLLAC 16 21 08 26.9 55.7 -5.7 -62.9 128 989 22 21 00 22 24 00 --- 16 24 08 27.4 56.0 -5.7 -63.3 180 1013 22 21 01 22 33 00 2013+370 16 33 10 46.3 72.3 -3.7 -72.3 496 1013 22 33 00 22 36 00 --- 16 36 10 46.9 72.5 -3.7 -72.5 180 1036 22 33 01 22 37 30 CYG-A 16 37 41 51.1 68.6 -3.4 -78.3 74 1036 22 37 30 22 52 30 --- 16 52 43 53.9 69.5 -3.1 -80.0 900 1152 22 37 31 22 54 00 CYG-A 16 54 13 54.2 69.6 -3.1 -80.2 84 1152 22 54 00 22 59 00 --- 16 59 14 55.1 69.8 -3.0 -80.8 300 1190 22 54 01 23 00 00 2013+370 17 00 14 51.5 74.6 -3.3 -74.6 44 1190 23 00 00 23 03 00 --- 17 03 15 52.1 74.8 -3.2 -74.9 180 1213 23 00 01 23 05 00 CYG-A 17 05 15 56.2 70.2 -2.9 -81.5 104 1213 23 05 00 23 20 00 --- 17 20 18 59.0 70.9 -2.7 -83.4 900 1329 23 05 01 23 21 00 CYG-A 17 21 18 59.2 70.9 -2.6 -83.5 54 1329 23 21 00 23 26 00 --- 17 26 19 60.2 71.1 -2.6 -84.2 300 1368 23 21 01 23 27 00 2013+370 17 27 19 56.7 76.9 -2.8 -76.9 44 1368 23 27 00 23 30 00 --- 17 30 19 57.3 77.1 -2.8 -77.1 180 1391 23 27 01 23 31 00 CYG-A 17 31 19 61.1 71.3 -2.5 -84.8 44 1391 23 31 00 23 46 00 --- 17 46 22 64.0 71.7 -2.2 -86.9 900 1507 23 31 01 23 47 00 CYG-A 17 47 22 64.1 71.8 -2.2 -87.0 54 1507 23 47 00 23 55 00 --- 17 55 23 65.7 71.9 -2.1 -88.2 480 1569 23 47 01 Schedule for VLBA_OV (Code Ov ) Page 4 Global 7mm VLBI observations of Cygnus A UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 20 Oct 2014 Day 293 --- 00 00 00 CYG-A 18 00 24 66.6 72.0 -2.0 -88.9 294 1569 00 00 00 00 04 00 --- 18 04 25 67.4 72.0 -1.9 -89.6 240 1600 00 00 01 00 07 00 BLLAC 18 07 25 45.3 64.2 -3.9 -76.0 125 1600 00 07 00 00 10 00 --- 18 10 26 45.8 64.4 -3.9 -76.3 180 1623 00 07 01 00 23 00 2013+370 18 23 28 67.7 81.4 -1.9 -81.4 731 1623 00 23 00 00 26 00 --- 18 26 28 68.3 81.6 -1.8 -81.6 180 1646 00 23 01 00 28 00 CYG-A 18 28 29 71.9 71.6 -1.5 -93.9 105 1646 00 28 00 00 43 00 --- 18 43 31 74.8 70.6 -1.3 -97.3 900 1762 00 28 01 00 44 00 CYG-A 18 44 31 74.9 70.5 -1.3 -97.5 54 1762 00 44 00 00 50 00 --- 18 50 32 76.1 69.9 -1.2 -99.1 360 1809 00 44 01 00 51 00 2013+370 18 51 32 73.2 83.5 -1.4 -83.6 42 1809 00 51 00 00 54 00 --- 18 54 33 73.8 83.8 -1.4 -83.8 180 1832 00 51 01 00 55 00 CYG-A 18 55 33 77.0 69.2 -1.1 -100.6 42 1832 00 55 00 01 10 00 --- 19 10 36 79.8 65.9 -0.8 -106.3 900 1948 00 55 01 01 11 00 CYG-A 19 11 36 80.0 65.6 -0.8 -106.8 54 1948 01 11 00 01 16 00 --- 19 16 37 80.9 63.8 -0.7 -109.4 300 1986 01 11 01 01 18 00 2013+370 19 18 37 78.6 85.6 -1.0 -85.7 97 1986 01 18 00 01 21 00 --- 19 21 37 79.2 85.8 -0.9 -85.9 180 2010 01 18 01 01 23 00 CYG-A 19 23 38 82.1 60.5 -0.6 -113.8 95 2010 01 23 00 01 38 00 --- 19 38 40 84.5 47.7 -0.4 -128.9 900 2126 01 23 01 01 39 00 CYG-A 19 39 40 84.7 46.5 -0.3 -130.3 53 2126 01 39 00 01 44 00 --- 19 44 41 85.4 38.8 -0.3 -138.8 300 2164 01 39 01 01 46 00 2013+370 19 46 42 84.2 87.7 -0.5 -87.8 77 2164 01 46 00 01 49 00 --- 19 49 42 84.8 88.0 -0.4 -88.1 180 2187 01 46 01 01 51 00 CYG-A 19 51 42 86.1 23.7 -0.1 -155.0 69 2187 01 51 00 02 06 00 --- 20 06 45 86.2 -19.8 0.1 159.2 900 2303 01 51 01 02 15 00 BLLAC 20 15 46 68.8 67.6 -1.8 -95.0 470 2303 02 15 00 02 18 00 --- 20 18 47 69.4 67.5 -1.7 -95.6 180 2326 02 15 01 02 27 00 2013+370 20 27 48 87.7 -89.0 0.2 89.2 421 2326 02 27 00 02 30 00 --- 20 30 49 87.1 -88.8 0.2 89.0 180 2350 02 27 01 Schedule for VLBA_OV (Code Ov ) Page 5 Global 7mm VLBI observations of Cygnus A UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 20 Oct 2014 Day 293 --- 02 31 00 CYG-A 20 31 49 82.9 -57.7 0.5 117.3 30 2350 02 31 00 02 46 00 --- 20 46 51 80.2 -65.1 0.8 107.5 900 2466 02 31 01 02 47 00 CYG-A 20 47 52 80.1 -65.4 0.8 107.1 54 2466 02 47 00 02 59 00 --- 20 59 54 77.9 -68.4 1.0 102.1 720 2558 02 47 01 03 07 00 2013+370 21 07 55 79.7 -86.0 0.9 86.1 459 2558 03 07 00 03 10 00 --- 21 10 55 79.1 -85.8 0.9 85.9 180 2582 03 07 01 03 11 00 CYG-A 21 11 55 75.6 -70.2 1.2 98.5 41 2582 03 11 00 03 26 00 --- 21 26 58 72.8 -71.4 1.4 94.8 900 2697 03 11 01 03 27 00 2013+370 21 27 58 75.7 -84.5 1.2 84.5 43 2697 03 27 00 03 30 00 --- 21 30 59 75.1 -84.3 1.2 84.3 180 2721 03 27 01 03 31 00 CYG-A 21 31 59 71.8 -71.6 1.5 93.8 43 2721 03 31 00 03 46 00 --- 21 47 01 69.0 -72.0 1.8 91.0 900 2837 03 31 01 03 47 00 CYG-A 21 48 01 68.8 -72.0 1.8 90.8 54 2837 03 47 00 03 52 00 --- 21 53 02 67.9 -72.0 1.9 90.0 300 2875 03 47 01 03 55 00 2013+370 21 56 03 70.2 -82.3 1.7 82.4 165 2875 03 55 00 03 58 00 --- 21 59 03 69.6 -82.1 1.7 82.1 180 2898 03 55 01 03 59 00 CYG-A 22 00 03 66.5 -72.0 2.0 88.9 45 2898 03 59 00 04 14 00 --- 22 15 06 63.7 -71.7 2.3 86.7 900 3014 03 59 01 04 15 00 CYG-A 22 16 06 63.5 -71.7 2.3 86.5 54 3014 04 15 00 04 23 00 --- 22 24 07 62.0 -71.4 2.4 85.4 480 3076 04 15 01 04 32 00 BLLAC 22 33 09 82.3 -45.8 0.5 129.4 487 3076 04 32 00 04 35 00 --- 22 36 09 81.9 -48.3 0.5 126.4 180 3099 04 32 01 04 44 00 2013+370 22 45 11 60.5 -78.5 2.5 78.5 491 3099 04 44 00 04 47 00 --- 22 48 11 59.9 -78.2 2.5 78.2 180 3123 04 44 01 04 48 00 CYG-A 22 49 11 57.3 -70.4 2.8 82.2 47 3123 04 48 00 05 03 00 --- 23 04 14 54.4 -69.7 3.1 80.4 900 3239 04 48 01 05 04 00 2013+370 23 05 14 56.6 -76.8 2.8 76.8 47 3239 05 04 00 05 07 00 --- 23 08 15 56.0 -76.6 2.9 76.6 180 3262 05 04 01 05 08 00 CYG-A 23 09 15 53.5 -69.4 3.2 79.8 47 3262 05 08 00 05 23 00 --- 23 24 17 50.7 -68.5 3.4 78.0 900 3378 05 08 01 Schedule for VLBA_OV (Code Ov ) Page 6 Global 7mm VLBI observations of Cygnus A UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 20 Oct 2014 Day 293 --- 05 24 00 CYG-A 23 25 17 50.5 -68.4 3.4 77.9 54 3378 05 24 00 05 28 00 --- 23 29 18 49.8 -68.2 3.5 77.4 240 3409 05 24 01 05 29 00 CYG-A 23 30 18 49.6 -68.1 3.5 77.3 54 3409 05 29 00 05 35 00 --- 23 36 19 48.5 -67.7 3.6 76.6 360 3455 05 29 01 05 36 00 2013+370 23 37 19 50.4 -74.1 3.4 74.1 48 3455 05 36 00 05 39 00 --- 23 40 20 49.9 -73.9 3.4 73.9 180 3478 05 36 01 05 40 00 CYG-A 23 41 20 47.6 -67.4 3.7 76.1 48 3478 05 40 00 05 55 00 --- 23 56 22 44.8 -66.3 3.9 74.4 900 3594 05 40 01 05 56 00 CYG-A 23 57 23 44.6 -66.3 4.0 74.3 54 3594 05 56 00 06 00 00 --- 00 01 23 43.9 -66.0 4.0 73.8 240 3625 05 56 01 06 02 00 CYG-A 00 03 24 43.5 -65.8 4.1 73.6 114 3625 06 02 00 06 07 00 --- 00 08 24 42.6 -65.4 4.1 73.0 300 3664 06 02 01 06 09 00 BLLAC 00 10 25 65.2 -68.1 2.1 91.2 64 3664 06 09 00 06 12 00 --- 00 13 25 64.7 -68.1 2.2 90.7 180 3687 06 09 01 06 21 00 2013+370 00 22 27 41.9 -70.2 4.1 70.2 488 3687 06 21 00 06 24 00 --- 00 25 27 41.3 -69.9 4.2 69.9 180 3710 06 21 01 06 25 00 CYG-A 00 26 27 39.4 -64.0 4.4 71.0 48 3710 06 25 00 06 40 00 --- 00 41 30 36.7 -62.8 4.7 69.3 900 3826 06 25 01 06 41 00 2013+370 00 42 30 38.1 -68.3 4.4 68.3 48 3826 06 41 00 06 44 00 --- 00 45 30 37.6 -68.0 4.5 68.0 180 3849 06 41 01 06 45 00 CYG-A 00 46 31 35.8 -62.4 4.8 68.7 48 3849 06 45 00 07 00 00 --- 01 01 33 33.2 -61.1 5.0 67.0 900 3965 06 45 01 07 01 00 CYG-A 01 02 33 33.0 -61.0 5.0 66.9 54 3965 07 01 00 07 11 00 --- 01 12 35 31.3 -60.1 5.2 65.7 600 4042 07 01 01 07 12 00 2013+370 01 13 35 32.5 -65.3 5.0 65.3 48 4042 07 12 00 07 15 00 --- 01 16 36 31.9 -65.0 5.0 65.0 180 4066 07 12 01 07 16 00 CYG-A 01 17 36 30.4 -59.6 5.3 65.1 48 4066 07 16 00 07 31 00 --- 01 32 38 27.8 -58.2 5.5 63.4 900 4181 07 16 01 07 32 00 2013+370 01 33 38 28.9 -63.3 5.3 63.3 48 4181 07 32 00 07 35 00 --- 01 36 39 28.3 -63.0 5.3 63.0 180 4205 07 32 01 Schedule for VLBA_OV (Code Ov ) Page 7 Global 7mm VLBI observations of Cygnus A UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 20 Oct 2014 Day 293 --- 07 36 00 CYG-A 01 37 39 27.0 -57.8 5.6 62.8 48 4205 07 36 00 07 51 00 --- 01 52 41 24.5 -56.3 5.9 61.0 900 4321 07 36 01 07 52 00 2013+370 01 53 42 25.3 -61.2 5.6 61.2 49 4321 07 52 00 07 55 00 --- 01 56 42 24.8 -60.9 5.7 60.9 180 4344 07 52 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: /home/bboccardi/SCHED/setups/sess314QG.setini Matching groups in /home/bboccardi/SCHED/catalogs/freq_RDBE.dat: v7mm_c8 Setup group: 9 Station: VLBA_OV Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: RDBE_DDC Speedup factor: 1.00 Disk used to record data. 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 IF 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= 15.1 7.6 11.6 The following frequency sets based on these setups were used. See the crd files for VLBA legacy system setups and pcal detection details. Frequency Set: 9 Setup file default. Used with PCAL = 1MHz LO sum= 43114.25 43114.25 43146.25 43146.25 43178.25 43178.25 43210.25 43210.25 BBC fr= 714.25 714.25 746.25 746.25 778.25 778.25 810.25 810.25 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 VLBA legacy crd files using 4 channels based on RDBE channels: 3 4 5 6 CRD fr= 754.25 754.25 786.25 786.25 CRD bw= 16.00 16.00 16.00 16.00 Matching frequency sets: 9 10 11 12 13 14 15 16 17 19 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) J1959+4044 19 57 44.453094 * 19 59 28.368821 19 59 59.565661 167.68 * CYG-A 40 35 46.31273 * 40 44 02.04732 40 46 56.28727 120.15 CYGNUS-A /home/bboccardi/SCHED/catalogs/sources.vlba J1959+40 rfc_2012b Petrov, 2012, unpublished 3 observations 1957+405 1957+404 J2015+3710 20 13 37.014489 * 20 15 28.729775 20 16 02.361112 0.16 * 2013+370 37 01 44.45943 * 37 10 59.51531 37 14 10.46269 0.16 /home/bboccardi/SCHED/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 282 observations J2202+4216 22 00 39.362504 * 22 02 43.291371 22 03 21.587829 0.14 * BLLAC 42 02 08.59073 * 42 16 39.97987 42 21 20.82381 0.10 2200+420 /home/bboccardi/SCHED/catalogs/sources.vlba J2202+42 rfc_2012b Petrov, 2012, unpublished 59418 observations VR422201 SOURCE SCAN SUMMARY FOR SOURCES LISTED ABOVE Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Setup file Frequency sets Observing hours (duplicates not shown) Scan Baseline CYG-A tups/sess314QG.setini 1 2 3 4 5 6 9 18 14.458 883.767 2013+370 tups/sess314QG.setini 1 2 3 4 5 6 9 18 2.300 140.650 BLLAC tups/sess314QG.setini 1 2 3 4 5 6 9 18 0.500 32.550 EFFECT OF SOLAR CORONA 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) CYG-A 100.7 2013+370 103.6 BLLAC 123.4 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