COVER INFORMATION Station: YEBES40M (Code Ys ) Experiment: Verify Gaia Astrometric Results using Radio Stars Exp. Code: EZ029B Schedule Version: 2.00 Processed by SCHED version: 11.50 Development version 11.5. Started Apr. 2 PI: Bo Zhang Address: Shanghai Astronomical Observatory 80 Nandan Road 200030 Shanghai P. R. China Phone: +86 3477 5508 EMAIL: zb@shao.ac.cn Fax: +86 3477 5508 Phone during observation: +86 3477 5508 Observing mode: Phase-referencing at 3.6 cm (1024 Mb/s) Notes: Schedule for YEBES40M (Code Ys ) Page 2 Verify Gaia Astrometric Results using Radio Stars 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 ---------------------------------------------------------------------------------------- --- Thu 13 Jun 2019 Day 164 --- Next scan frequencies: 8367.49 8367.49 8367.49 8367.49 8399.49 8399.49 8399.49 8399.49 8431.49 8431.49 8431.49 8431.49 8463.49 8463.49 8463.49 8463.49 Next BBC frequencies: 717.49 717.49 717.49 717.49 749.49 749.49 749.49 749.49 781.49 781.49 781.49 781.49 813.49 813.49 813.49 813.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 02 30 00 J0217+7349 19 42 09 36.2 19.8 -6.6 -68.3 0 0 02 30 00 02 33 20 =0212+735 19 45 29 36.4 19.9 -6.6 -69.1 200 26 02 30 01 02 42 02 J0110+0714 19 54 13 12.9 91.3 -5.3 -50.0 437 26 02 42 02 02 43 02 --- 19 55 13 13.1 91.5 -5.3 -50.0 60 33 02 42 03 02 43 02 UV_PSC 19 55 13 11.6 90.8 -5.4 -50.0 -16 33 No stop 02 45 02 --- 19 57 13 11.9 91.1 -5.3 -50.0 104 49 02 43 03 02 45 02 J0110+0714 19 57 13 13.4 91.8 -5.2 -50.0 -16 49 No stop 02 46 32 --- 19 58 43 13.7 92.0 -5.2 -50.0 74 61 02 45 03 02 46 32 UV_PSC 19 58 43 12.2 91.3 -5.3 -49.9 -16 61 No stop 02 48 32 --- 20 00 44 12.6 91.7 -5.3 -49.9 104 76 02 46 33 02 49 02 J0110+0714 20 01 14 14.2 92.5 -5.2 -50.0 14 76 02 49 02 02 50 32 --- 20 02 44 14.5 92.7 -5.1 -50.0 90 88 02 49 03 02 50 32 UV_PSC 20 02 44 13.0 92.0 -5.3 -49.9 -16 88 No stop 02 52 32 --- 20 04 44 13.4 92.3 -5.2 -49.9 104 103 02 50 33 02 52 32 J0110+0714 20 04 44 14.9 93.0 -5.1 -49.9 -16 103 No stop 02 54 02 --- 20 06 15 15.1 93.3 -5.1 -49.9 74 115 02 52 33 02 54 02 UV_PSC 20 06 15 13.7 92.6 -5.2 -49.9 -16 115 No stop 02 56 02 --- 20 08 15 14.0 92.9 -5.2 -49.9 104 130 02 54 03 02 56 32 J0110+0714 20 08 45 15.6 93.7 -5.0 -49.9 14 130 02 56 32 02 58 02 --- 20 10 15 15.9 93.9 -5.0 -49.9 90 142 02 56 33 02 58 02 UV_PSC 20 10 15 14.4 93.2 -5.1 -49.9 -16 142 No stop 03 00 02 --- 20 12 16 14.8 93.6 -5.1 -49.8 104 157 02 58 03 03 00 02 J0110+0714 20 12 16 16.3 94.3 -5.0 -49.8 -16 157 No stop 03 01 32 --- 20 13 46 16.6 94.5 -5.0 -49.8 74 169 03 00 03 03 05 18 J0243+7120 20 17 33 35.9 23.0 -6.5 -68.7 140 169 03 05 18 03 06 18 =0238+711 20 18 33 36.0 23.0 -6.4 -68.9 60 176 03 05 19 Schedule for YEBES40M (Code Ys ) Page 3 Verify Gaia Astrometric Results using Radio Stars 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 ---------------------------------------------------------------------------------------- --- Thu 13 Jun 2019 Day 164 --- 03 06 18 RZ_CAS 20 18 33 34.9 24.8 -6.5 -66.7 -17 176 No stop 03 08 18 --- 20 20 34 35.1 24.8 -6.5 -67.1 103 192 03 06 19 03 08 18 J0243+7120 20 20 34 36.1 23.1 -6.4 -69.4 -17 192 No stop 03 09 48 =0238+711 20 22 04 36.3 23.2 -6.4 -69.7 73 204 03 08 19 03 09 48 RZ_CAS 20 22 04 35.2 24.9 -6.5 -67.4 -17 204 No stop 03 11 48 --- 20 24 04 35.4 25.0 -6.4 -67.8 103 219 03 09 49 03 12 18 J0243+7120 20 24 34 36.4 23.2 -6.3 -70.2 13 219 03 12 18 03 13 48 =0238+711 20 26 04 36.6 23.3 -6.3 -70.6 90 231 03 12 19 03 13 48 RZ_CAS 20 26 04 35.5 25.1 -6.4 -68.2 -17 231 No stop 03 15 48 --- 20 28 05 35.7 25.1 -6.4 -68.7 103 246 03 13 49 03 15 48 J0243+7120 20 28 05 36.7 23.4 -6.3 -71.0 -17 246 No stop 03 17 18 =0238+711 20 29 35 36.8 23.4 -6.3 -71.3 73 258 03 15 49 03 17 18 RZ_CAS 20 29 35 35.8 25.2 -6.4 -69.0 -17 258 No stop 03 19 18 --- 20 31 35 36.0 25.3 -6.3 -69.4 103 273 03 17 19 03 19 48 J0243+7120 20 32 05 37.0 23.5 -6.2 -71.9 13 273 03 19 48 03 21 18 =0238+711 20 33 36 37.1 23.5 -6.2 -72.2 90 285 03 19 49 03 21 18 RZ_CAS 20 33 36 36.1 25.4 -6.3 -69.8 -17 285 No stop 03 23 18 --- 20 35 36 36.3 25.4 -6.3 -70.3 103 300 03 21 19 03 23 18 J0243+7120 20 35 36 37.3 23.6 -6.2 -72.6 -17 300 No stop 03 24 48 =0238+711 20 37 06 37.4 23.6 -6.1 -73.0 73 312 03 23 19 03 27 39 J0626+8202 20 39 57 33.7 5.1 -9.8 -29.4 137 312 03 27 39 03 28 39 --- 20 40 57 33.7 5.2 -9.8 -29.6 60 319 03 27 40 03 28 39 SV_CAM 20 40 57 33.6 4.5-10.1 -26.2 -16 319 No stop 03 30 39 --- 20 42 58 33.7 4.6-10.0 -26.7 104 335 03 28 40 03 30 39 J0626+8202 20 42 58 33.7 5.2 -9.8 -30.1 -16 335 No stop 03 32 09 --- 20 44 28 33.8 5.3 -9.8 -30.4 74 347 03 30 40 03 32 09 SV_CAM 20 44 28 33.7 4.6-10.0 -27.0 -16 347 No stop 03 34 09 --- 20 46 28 33.7 4.7-10.0 -27.5 104 362 03 32 10 03 34 39 J0626+8202 20 46 58 33.8 5.4 -9.7 -31.0 14 362 03 34 39 03 36 09 --- 20 48 29 33.8 5.4 -9.7 -31.3 90 374 03 34 40 Schedule for YEBES40M (Code Ys ) Page 4 Verify Gaia Astrometric Results using Radio Stars 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 ---------------------------------------------------------------------------------------- --- Thu 13 Jun 2019 Day 164 --- 03 36 09 SV_CAM 20 48 29 33.8 4.8 -9.9 -27.9 -16 374 No stop 03 38 09 --- 20 50 29 33.8 4.8 -9.9 -28.4 104 389 03 36 10 03 38 09 J0626+8202 20 50 29 33.9 5.5 -9.7 -31.8 -16 389 No stop 03 39 39 --- 20 51 59 33.9 5.6 -9.6 -32.1 74 401 03 38 10 03 39 39 SV_CAM 20 51 59 33.8 4.9 -9.9 -28.7 -16 401 No stop 03 41 39 --- 20 54 00 33.9 5.0 -9.9 -29.2 104 416 03 39 40 03 42 09 J0626+8202 20 54 30 33.9 5.7 -9.6 -32.7 14 416 03 42 09 03 43 39 --- 20 56 00 34.0 5.7 -9.6 -33.1 90 428 03 42 10 03 43 39 SV_CAM 20 56 00 33.9 5.0 -9.8 -29.6 -16 428 No stop 03 45 39 --- 20 58 00 33.9 5.1 -9.8 -30.1 104 443 03 43 40 03 45 39 J0626+8202 20 58 00 34.0 5.8 -9.5 -33.5 -16 443 No stop 03 47 09 --- 20 59 31 34.0 5.8 -9.5 -33.9 74 455 03 45 40 03 49 21 J0811+5714 21 01 43 8.3 6.7-11.2 -9.4 91 455 03 49 21 03 50 21 --- 21 02 43 8.3 6.8-11.2 -9.6 60 462 03 49 22 03 50 21 54_CAM 21 02 43 8.5 8.0-11.0 -11.2 -16 462 No stop 03 52 21 --- 21 04 43 8.6 8.2-11.0 -11.6 104 478 03 50 22 03 52 21 J0811+5714 21 04 43 8.3 7.1-11.1 -10.0 -16 478 No stop 03 53 51 --- 21 06 14 8.4 7.3-11.1 -10.3 74 490 03 52 22 03 53 51 54_CAM 21 06 14 8.6 8.4-11.0 -11.9 -16 490 No stop 03 55 51 --- 21 08 14 8.7 8.7-10.9 -12.3 104 505 03 53 52 03 56 21 J0811+5714 21 08 44 8.4 7.6-11.1 -10.8 14 505 03 56 21 03 57 51 --- 21 10 14 8.5 7.8-11.0 -11.0 90 517 03 56 22 03 57 51 54_CAM 21 10 14 8.7 9.0-10.9 -12.6 -16 517 No stop 03 59 51 --- 21 12 15 8.8 9.2-10.9 -13.0 104 532 03 57 52 03 59 51 J0811+5714 21 12 15 8.5 8.1-11.0 -11.4 -16 532 No stop 04 01 21 --- 21 13 45 8.6 8.3-11.0 -11.7 74 544 03 59 52 04 01 21 54_CAM 21 13 45 8.8 9.4-10.8 -13.3 -16 544 No stop 04 03 21 --- 21 15 45 8.9 9.7-10.8 -13.7 104 559 04 01 22 04 03 51 J0811+5714 21 16 15 8.6 8.7-10.9 -12.2 14 559 04 03 51 04 05 21 --- 21 17 46 8.7 8.9-10.9 -12.5 90 571 04 03 52 Schedule for YEBES40M (Code Ys ) Page 5 Verify Gaia Astrometric Results using Radio Stars 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 ---------------------------------------------------------------------------------------- --- Thu 13 Jun 2019 Day 164 --- 04 05 21 54_CAM 21 17 46 9.0 10.0-10.8 -14.1 -16 571 No stop 04 07 21 --- 21 19 46 9.0 10.2-10.7 -14.4 104 586 04 05 22 04 07 21 J0811+5714 21 19 46 8.7 9.1-10.9 -12.9 -16 586 No stop 04 08 51 --- 21 21 16 8.8 9.3-10.9 -13.1 74 598 04 07 22 04 14 15 XY_UMA 21 26 41 5.0 2.2-11.7 D -2.9 301 598 04 14 15 04 16 15 --- 21 28 41 5.0 2.5-11.7 -3.3 0 613 04 14 16 04 18 15 XY_UMA 21 30 42 5.0 2.8-11.7 -3.7 105 613 04 18 15 04 20 15 --- 21 32 42 5.0 3.1-11.6 -4.1 120 629 04 18 16 04 21 45 XY_UMA 21 34 12 5.1 3.3-11.6 -4.4 75 629 04 21 45 04 23 45 --- 21 36 13 5.1 3.6-11.6 -4.8 120 644 04 21 46 04 25 45 XY_UMA 21 38 13 5.1 3.9-11.6 -5.1 105 644 04 25 45 04 27 45 --- 21 40 13 5.1 4.2-11.5 -5.5 120 660 04 25 46 04 30 55 J1220+7105 21 43 24 25.0 -13.2 9.4 32.2 155 660 04 30 55 04 31 55 --- 21 44 24 25.0 -13.1 9.4 32.0 60 667 04 30 56 04 31 55 DK_DRA 21 44 24 26.0 -11.9 9.5 31.4 -16 667 No stop 04 33 55 --- 21 46 24 26.0 -11.8 9.5 31.0 104 683 04 31 56 04 33 55 J1220+7105 21 46 24 24.9 -13.0 9.4 31.5 -16 683 No stop 04 35 25 --- 21 47 55 24.8 -12.8 9.4 31.2 74 694 04 33 56 04 35 25 DK_DRA 21 47 55 25.9 -11.7 9.5 30.7 -16 694 No stop 04 37 25 --- 21 49 55 25.8 -11.5 9.6 30.3 104 710 04 35 26 04 37 55 J1220+7105 21 50 25 24.7 -12.6 9.5 30.7 14 710 04 37 55 04 39 25 --- 21 51 55 24.7 -12.5 9.5 30.4 90 721 04 37 56 04 39 25 DK_DRA 21 51 55 25.8 -11.4 9.6 29.9 -16 721 No stop 04 41 25 --- 21 53 56 25.7 -11.2 9.6 29.5 104 737 04 39 26 04 41 25 J1220+7105 21 53 56 24.6 -12.4 9.5 30.0 -16 737 No stop 04 42 55 --- 21 55 26 24.5 -12.3 9.6 29.7 74 748 04 41 26 04 42 55 DK_DRA 21 55 26 25.6 -11.1 9.6 29.1 -16 748 No stop 04 44 55 --- 21 57 26 25.5 -11.0 9.7 28.7 104 764 04 42 56 04 45 25 J1220+7105 21 57 56 24.4 -12.1 9.6 29.2 14 764 04 45 25 04 46 55 --- 21 59 27 24.4 -11.9 9.6 28.9 90 775 04 45 26 Schedule for YEBES40M (Code Ys ) Page 6 Verify Gaia Astrometric Results using Radio Stars 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 ---------------------------------------------------------------------------------------- --- Thu 13 Jun 2019 Day 164 --- 04 46 55 DK_DRA 21 59 27 25.5 -10.8 9.7 28.3 -16 775 No stop 04 48 55 --- 22 01 27 25.4 -10.7 9.7 27.9 104 791 04 46 56 04 48 55 J1220+7105 22 01 27 24.3 -11.8 9.7 28.5 -16 791 No stop 04 50 25 --- 22 02 57 24.2 -11.7 9.7 28.2 74 803 04 48 56 04 50 25 DK_DRA 22 02 57 25.4 -10.6 9.8 27.6 -16 803 No stop 04 52 25 --- 22 04 57 25.3 -10.4 9.8 27.2 104 818 04 50 26 04 52 55 J1220+7105 22 05 28 24.1 -11.5 9.7 27.7 14 818 04 52 55 04 54 25 --- 22 06 58 24.1 -11.4 9.8 27.3 90 830 04 52 56 04 56 37 J0217+7349 22 09 10 46.2 20.8 -4.2 -103.1 84 830 04 56 37 04 59 57 =0212+735 22 12 30 46.4 20.7 -4.1 -103.9 200 855 04 56 38 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess219.X1024 --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 7 Station: YEBES40M Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 32.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 7650.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 2 10 2 10 3 11 3 11 4 12 4 12 BBC SB= L L U U L L U U L L U U L L U U IF = A1 C1 A1 C1 A1 C1 A1 C1 A1 C1 A1 C1 A1 C1 A1 C1 The following frequency sets based on these setups were used. Frequency Set: 7 Setup file default. Used with PCAL = off LO sum= 8367.49 8367.49 8367.49 8367.49 8399.49 8399.49 8399.49 8399.49 8431.49 8431.49 8431.49 8431.49 8463.49 8463.49 8463.49 8463.49 BBC fr= 717.49 717.49 717.49 717.49 749.49 749.49 749.49 749.49 781.49 781.49 781.49 781.49 813.49 813.49 813.49 813.49 Bandwd= 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Matching frequency sets: 7 8 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * UV_PSC 01 14 18.821903 * 01 16 55.119300 01 17 54.306376 0.00 06 32 54.06222 * 06 48 42.13110 06 54 39.02541 0.00 From catalog imbedded in main SCHED input file. * RZ_CAS 02 44 22.801669 * 02 48 55.509700 02 50 38.261112 0.00 69 25 35.04170 * 69 38 03.44150 69 42 31.32173 0.00 From catalog imbedded in main SCHED input file. * SV_CAM 06 30 38.105208 * 06 41 19.082100 06 45 12.571925 0.00 82 18 39.13752 * 82 16 02.43600 82 14 53.47910 0.00 From catalog imbedded in main SCHED input file. * 54_CAM 07 58 31.912481 * 08 02 35.783500 08 04 06.513589 0.00 57 24 48.15851 * 57 16 25.06340 57 13 15.76839 0.00 From catalog imbedded in main SCHED input file. * XY_UMA 09 06 18.146662 * 09 09 55.935500 09 11 17.230102 0.00 54 41 30.81058 * 54 29 17.72530 54 24 45.18370 0.00 From catalog imbedded in main SCHED input file. * DK_DRA 12 13 21.311815 * 12 15 41.491400 12 16 34.767075 0.00 72 49 44.09364 * 72 33 04.30570 72 27 00.91017 0.00 From catalog imbedded in main SCHED input file. * J0110+0714 01 07 56.775559 * 01 10 33.019100 01 11 32.220097 0.00 06 58 45.52184 * 07 14 42.24200 07 20 42.44774 0.00 From catalog imbedded in main SCHED input file. * J0626+8202 06 15 32.765079 * 06 26 03.006200 06 29 53.329576 0.00 82 03 56.43145 * 82 02 25.56800 82 01 40.54200 0.00 From catalog imbedded in main SCHED input file. * J0811+5714 08 06 58.833644 * 08 11 00.609300 08 12 30.570735 0.00 57 23 07.11448 * 57 14 12.49500 57 10 51.80811 0.00 From catalog imbedded in main SCHED input file. * J0902+5402 08 58 40.320558 * 09 02 19.287500 09 03 41.009497 0.00 54 14 47.23532 * 54 02 57.25600 53 58 32.95606 0.00 From catalog imbedded in main SCHED input file. * J1220+7105 12 17 46.077588 * 12 20 03.628400 12 20 56.029888 0.00 71 22 09.52384 * 71 05 31.13400 70 59 28.12031 0.00 From catalog imbedded in main SCHED input file. 0212+735 02 12 49.921887 * 02 17 30.813367 02 19 17.080157 0.36 * J0217+7349 73 35 40.08544 * 73 49 32.62177 73 54 31.37509 0.10 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.rfc rfc_2018a Petrov and Kovalev, in preparation 58090 observations 0238+711 02 38 50.010283 * 02 43 30.891349 02 45 16.793967 0.52 * J0243+7120 71 07 33.80215 * 71 20 17.90421 71 24 51.40228 0.23 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.rfc rfc_2018a Petrov and Kovalev, in preparation 173 observations 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 UV_PSC sess219.X1024 1 2 3 4 5 6 7 9 0.167 7.777 RZ_CAS sess219.X1024 1 2 3 4 5 6 7 9 0.167 7.572 SV_CAM sess219.X1024 2 3 4 5 6 7 9 0.167 6.574 54_CAM sess219.X1024 2 3 4 5 6 7 9 0.167 6.462 XY_UMA sess219.X1024 2 3 4 5 6 7 9 0.167 5.972 DK_DRA sess219.X1024 2 3 4 5 6 7 9 0.200 7.706 J0110+0714 sess219.X1024 1 2 3 4 5 6 7 9 0.142 6.925 J0626+8202 sess219.X1024 2 3 4 5 6 7 9 0.142 5.818 J0811+5714 sess219.X1024 2 3 4 5 6 7 9 0.142 5.751 J0902+5402 sess219.X1024 2 3 4 5 6 7 9 0.142 4.578 J1220+7105 sess219.X1024 2 3 4 5 6 7 9 0.167 6.830 J0217+7349 sess219.X1024 1 2 3 4 5 6 7 9 0.111 6.111 J0243+7120 sess219.X1024 1 2 3 4 5 6 7 9 0.142 6.789 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) UV_PSC 61.3 RZ_CAS 51.8 SV_CAM 59.6 54_CAM 44.5 XY_UMA 52.1 DK_DRA 71.7 J0110+0714 62.6 J0626+8202 59.2 J0811+5714 45.5 J0902+5402 50.9 J1220+7105 72.6 J0217+7349 56.3 J0243+7120 53.3 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