COVER INFORMATION Station: ZELENCHK (Code Zc ) Experiment: Verify Gaia Astrometric Results using Radio Stars Exp. Code: EZ029C Schedule Version: 3.00 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 ZELENCHK (Code Zc ) 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: 287.49 287.49 287.49 287.49 319.49 319.49 319.49 319.49 351.49 351.49 351.49 351.49 383.49 383.49 383.49 383.49 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 17 30 00 J1642+3948 13 43 13 56.5 441.0 -3.0 -68.1 0 0 17 30 00 17 33 00 =1641+399 13 46 14 57.1 441.4 -3.0 -68.2 180 23 17 30 01 17 36 14 J1308+3546 13 49 28 78.8 586.9 0.7 40.5 24 23 17 36 14 17 37 14 --- 13 50 29 78.7 587.7 0.7 41.1 60 31 17 36 15 17 37 14 RS_CVN 13 50 29 79.1 586.5 0.6 40.2 -14 31 No stop 17 39 14 --- 13 52 29 78.8 588.1 0.7 41.5 106 46 17 37 15 17 39 14 J1308+3546 13 52 29 78.4 589.3 0.7 42.3 -15 46 No stop 17 40 44 --- 13 53 59 78.2 590.4 0.7 43.2 75 58 17 39 15 17 40 44 RS_CVN 13 53 59 78.6 589.2 0.7 42.4 -14 58 No stop 17 42 44 --- 13 55 59 78.3 590.7 0.7 43.6 106 73 17 40 45 17 43 14 J1308+3546 13 56 30 77.9 592.1 0.8 44.6 15 73 17 43 14 17 44 44 --- 13 58 00 77.6 593.1 0.8 45.3 90 85 17 43 15 17 44 44 RS_CVN 13 58 00 78.1 592.2 0.8 44.7 -13 85 No stop 17 46 44 --- 14 00 00 77.8 593.5 0.8 45.7 107 100 17 44 45 17 46 44 J1308+3546 14 00 00 77.3 594.5 0.8 46.3 -14 100 No stop 17 48 14 --- 14 01 30 77.1 595.4 0.9 47.0 76 112 17 46 45 17 48 14 RS_CVN 14 01 30 77.6 594.5 0.8 46.5 -13 112 No stop 17 50 14 --- 14 03 31 77.3 595.8 0.9 47.4 107 127 17 48 15 17 50 44 J1308+3546 14 04 01 76.7 596.9 0.9 48.1 16 127 17 50 44 17 52 14 --- 14 05 31 76.5 597.8 0.9 48.8 90 138 17 50 45 17 56 20 J1558+6521 14 09 38 63.7 745.6 -1.8 -131.6 73 138 17 56 20 17 57 20 --- 14 10 38 63.8 745.5 -1.8 -132.0 60 146 17 56 21 17 57 20 AG_DRA 14 10 38 62.6 743.6 -1.9 -133.0 -17 146 No stop 17 59 20 --- 14 12 38 62.7 743.3 -1.8 -133.7 103 162 17 57 21 17 59 20 J1558+6521 14 12 38 64.0 745.2 -1.8 -132.7 -17 162 No stop 18 00 50 --- 14 14 08 64.1 744.9 -1.7 -133.3 73 173 17 59 21 Schedule for ZELENCHK (Code Zc ) 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 --- 18 00 50 AG_DRA 14 14 08 62.9 743.1 -1.8 -134.2 -17 173 No stop 18 02 50 --- 14 16 09 63.0 742.8 -1.8 -135.0 103 188 18 00 51 18 03 20 J1558+6521 14 16 39 64.3 744.5 -1.7 -134.2 13 188 18 03 20 18 04 50 --- 14 18 09 64.4 744.3 -1.7 -134.8 90 200 18 03 21 18 04 50 AG_DRA 14 18 09 63.1 742.4 -1.7 -135.7 -17 200 No stop 18 06 50 --- 14 20 09 63.3 742.1 -1.7 -136.4 103 215 18 04 51 18 06 50 J1558+6521 14 20 09 64.5 743.9 -1.6 -135.5 -17 215 No stop 18 08 20 --- 14 21 40 64.6 743.6 -1.6 -136.1 73 227 18 06 51 18 08 20 AG_DRA 14 21 40 63.4 741.9 -1.7 -137.0 -17 227 No stop 18 10 20 --- 14 23 40 63.5 741.6 -1.6 -137.8 103 242 18 08 21 18 10 50 J1558+6521 14 24 10 64.8 743.2 -1.6 -137.1 13 242 18 10 50 18 12 20 --- 14 25 40 64.9 742.9 -1.6 -137.7 90 254 18 10 51 18 13 19 J1635+5955 14 26 39 64.8 759.0 -2.2 -115.1 18 254 18 13 19 18 14 19 --- 14 27 39 64.9 758.9 -2.1 -115.4 60 262 18 13 20 18 14 19 WW_DRA 14 27 39 64.2 757.7 -2.2 -115.7 -15 262 No stop 18 16 19 --- 14 29 39 64.4 757.4 -2.2 -116.4 105 277 18 14 20 18 16 19 J1635+5955 14 29 39 65.1 758.6 -2.1 -116.1 -15 277 No stop 18 17 49 --- 14 31 10 65.3 758.4 -2.1 -116.6 75 288 18 16 20 18 17 49 WW_DRA 14 31 10 64.6 757.2 -2.1 -116.9 -15 288 No stop 18 19 49 --- 14 33 10 64.8 757.0 -2.1 -117.6 105 304 18 17 50 18 20 19 J1635+5955 14 33 40 65.6 758.1 -2.0 -117.4 15 304 18 20 19 18 21 49 --- 14 35 10 65.7 757.9 -2.0 -117.9 90 315 18 20 20 18 21 49 WW_DRA 14 35 10 65.0 756.7 -2.1 -118.3 -15 315 No stop 18 23 49 --- 14 37 11 65.2 756.4 -2.0 -118.9 105 331 18 21 50 18 23 49 J1635+5955 14 37 11 66.0 757.6 -2.0 -118.6 -15 331 No stop 18 25 19 --- 14 38 41 66.1 757.4 -2.0 -119.2 75 342 18 23 50 18 25 19 WW_DRA 14 38 41 65.4 756.2 -2.0 -119.5 -15 342 No stop 18 27 19 --- 14 40 41 65.6 755.9 -2.0 -120.2 105 358 18 25 20 18 27 49 J1635+5955 14 41 11 66.4 757.0 -1.9 -120.1 16 358 18 27 49 18 29 19 --- 14 42 42 66.6 756.7 -1.9 -120.6 90 369 18 27 50 Schedule for ZELENCHK (Code Zc ) 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 --- 18 38 50 J1756+1535 14 52 14 41.7 470.9 -3.1 -44.5 259 369 18 38 50 18 39 50 --- 14 53 15 41.9 471.1 -3.1 -44.4 60 377 18 38 51 18 39 50 Z_HER 14 53 15 41.4 471.2 -3.1 -44.2 -11 377 No stop 18 41 50 --- 14 55 15 41.7 471.7 -3.1 -44.0 109 392 18 39 51 18 41 50 J1756+1535 14 55 15 42.2 471.6 -3.0 -44.2 -12 392 No stop 18 43 20 --- 14 56 45 42.5 471.9 -3.0 -44.1 78 404 18 41 51 18 43 20 Z_HER 14 56 45 42.0 472.0 -3.0 -43.9 -11 404 No stop 18 45 20 --- 14 58 45 42.3 472.5 -3.0 -43.7 109 419 18 43 21 18 45 50 J1756+1535 14 59 15 42.9 472.5 -3.0 -43.8 18 419 18 45 50 18 47 20 --- 15 00 46 43.2 472.9 -3.0 -43.7 90 431 18 45 51 18 47 20 Z_HER 15 00 46 42.6 473.0 -3.0 -43.5 -11 431 No stop 18 49 20 --- 15 02 46 43.0 473.5 -2.9 -43.3 109 446 18 47 21 18 49 20 J1756+1535 15 02 46 43.5 473.3 -2.9 -43.5 -12 446 No stop 18 50 50 --- 15 04 16 43.7 473.7 -2.9 -43.3 78 458 18 49 21 18 50 50 Z_HER 15 04 16 43.2 473.8 -2.9 -43.2 -11 458 No stop 18 52 50 --- 15 06 17 43.5 474.3 -2.9 -43.0 109 473 18 50 51 18 53 20 J1756+1535 15 06 47 44.2 474.3 -2.8 -43.1 18 473 18 53 20 18 54 50 --- 15 08 17 44.4 474.7 -2.8 -42.9 90 485 18 53 21 18 54 50 Z_HER 15 08 17 43.9 474.8 -2.8 -42.8 -11 485 No stop 18 56 50 --- 15 10 17 44.2 475.3 -2.8 -42.5 109 500 18 54 51 18 56 50 J1756+1535 15 10 17 44.7 475.2 -2.8 -42.7 -12 500 No stop 18 58 20 --- 15 11 48 45.0 475.6 -2.8 -42.5 78 512 18 56 51 19 00 58 J1926+5052 15 14 26 48.0 417.2 -4.2 -74.2 75 512 19 00 58 19 01 58 --- 15 15 27 48.2 417.2 -4.2 -74.3 60 519 19 00 59 19 01 58 V1762_CYG 15 15 27 51.2 415.9 -3.9 -78.8 -21 519 No stop 19 03 58 --- 15 17 27 51.5 416.0 -3.9 -79.1 99 535 19 01 59 19 03 58 J1926+5052 15 17 27 48.5 417.4 -4.2 -74.6 -20 535 No stop 19 05 28 --- 15 18 57 48.7 417.4 -4.1 -74.9 70 546 19 03 59 19 05 28 V1762_CYG 15 18 57 51.7 416.1 -3.8 -79.4 -21 546 No stop 19 07 28 --- 15 20 58 52.0 416.2 -3.8 -79.7 99 562 19 05 29 Schedule for ZELENCHK (Code Zc ) 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 --- 19 07 58 J1926+5052 15 21 28 49.1 417.6 -4.1 -75.2 10 562 19 07 58 19 09 28 --- 15 22 58 49.3 417.7 -4.1 -75.4 90 573 19 07 59 19 09 28 V1762_CYG 15 22 58 52.3 416.2 -3.8 -80.0 -21 573 No stop 19 11 28 --- 15 24 58 52.6 416.3 -3.7 -80.4 99 588 19 09 29 19 11 28 J1926+5052 15 24 58 49.6 417.8 -4.0 -75.7 -20 588 No stop 19 12 58 --- 15 26 28 49.9 417.9 -4.0 -76.0 70 600 19 11 29 19 12 58 V1762_CYG 15 26 28 52.9 416.4 -3.7 -80.6 -21 600 No stop 19 14 58 --- 15 28 29 53.2 416.5 -3.7 -81.0 99 615 19 12 59 19 15 28 J1926+5052 15 28 59 50.2 418.1 -4.0 -76.3 10 615 19 15 28 19 16 58 --- 15 30 29 50.5 418.1 -3.9 -76.6 90 627 19 15 29 19 16 58 V1762_CYG 15 30 29 53.5 416.6 -3.6 -81.3 -21 627 No stop 19 18 58 --- 15 32 29 53.8 416.6 -3.6 -81.6 99 642 19 16 59 19 18 58 J1926+5052 15 32 29 50.8 418.3 -3.9 -76.9 -20 642 No stop 19 20 28 --- 15 34 00 51.0 418.3 -3.9 -77.1 70 654 19 18 59 19 23 08 J1925+2106 15 36 40 37.7 456.2 -3.8 -50.3 97 654 19 23 08 19 24 08 --- 15 37 40 37.8 456.4 -3.8 -50.3 60 662 19 23 09 19 24 08 U_SGE 15 37 40 38.2 459.3 -3.7 -49.2 -20 662 No stop 19 26 08 --- 15 39 41 38.5 459.6 -3.7 -49.1 100 677 19 24 09 19 26 08 J1925+2106 15 39 41 38.2 456.8 -3.8 -50.2 -20 677 No stop 19 27 38 --- 15 41 11 38.5 457.1 -3.8 -50.2 70 688 19 26 09 19 27 38 U_SGE 15 41 11 38.8 459.9 -3.6 -49.0 -20 688 No stop 19 29 38 --- 15 43 11 39.1 460.3 -3.6 -48.9 100 704 19 27 39 19 30 08 J1925+2106 15 43 41 38.9 457.6 -3.7 -50.1 10 704 19 30 08 19 31 38 --- 15 45 12 39.2 457.9 -3.7 -50.1 90 715 19 30 09 19 31 38 U_SGE 15 45 12 39.5 460.7 -3.6 -48.9 -20 715 No stop 19 33 38 --- 15 47 12 39.8 461.1 -3.5 -48.8 100 731 19 31 39 19 33 38 J1925+2106 15 47 12 39.5 458.2 -3.7 -50.0 -20 731 No stop 19 35 08 --- 15 48 42 39.8 458.5 -3.6 -49.9 70 742 19 33 39 19 35 08 U_SGE 15 48 42 40.1 461.5 -3.5 -48.7 -20 742 No stop 19 37 08 --- 15 50 42 40.5 461.9 -3.5 -48.6 100 758 19 35 09 Schedule for ZELENCHK (Code Zc ) 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 --- 19 37 38 J1925+2106 15 51 13 40.3 459.0 -3.6 -49.9 10 758 19 37 38 19 39 08 --- 15 52 43 40.5 459.3 -3.6 -49.8 90 769 19 37 39 19 39 08 U_SGE 15 52 43 40.8 462.3 -3.4 -48.5 -20 769 No stop 19 41 08 --- 15 54 43 41.2 462.7 -3.4 -48.4 100 785 19 39 09 19 41 08 J1925+2106 15 54 43 40.9 459.7 -3.5 -49.7 -20 785 No stop 19 42 38 --- 15 56 13 41.2 460.0 -3.5 -49.7 70 796 19 41 09 19 55 17 J1800+7828 16 08 54 53.7 369.0 -1.8 -145.5 643 796 19 55 17 19 58 17 =1803+784 16 11 54 53.8 368.8 -1.8 -146.4 180 819 19 55 18 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess219.X1024 Matching groups in /home/guest/rmc/SCHED/sched11.5/catalogs/freq_RDBE.dat: kvzr_x Added by Des Small, 24 February 2012 Setup group: 2 Station: ZELENCHK Total bit rate: 1024 Format: MARK5B Bits per sample: 2 Sample rate: 32.000 Number of channels: 16 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 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 = A B A B A B A B A B A B A B A B The following frequency sets based on these setups were used. Frequency Set: 9 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= 287.49 287.49 287.49 287.49 319.49 319.49 319.49 319.49 351.49 351.49 351.49 351.49 383.49 383.49 383.49 383.49 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: 9 10 11 Track assignments are: track1= 18, 26, 2, 10, 20, 28, 4, 12, 22, 30, 6, 14, 24, 32, 8, 16 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * RS_CVN 13 08 17.661648 * 13 10 36.907900 13 11 30.585398 0.00 36 12 01.82786 * 35 56 05.58770 35 50 11.64202 0.00 From catalog imbedded in main SCHED input file. * AG_DRA 16 01 23.185191 * 16 01 41.012600 16 01 50.901004 0.00 66 56 25.16220 * 66 48 10.13120 66 45 10.69271 0.00 From catalog imbedded in main SCHED input file. * WW_DRA 16 38 22.037207 * 16 39 03.979900 16 39 22.605067 0.00 60 47 46.62662 * 60 41 58.77780 60 39 53.10471 0.00 From catalog imbedded in main SCHED input file. * Z_HER 17 55 51.266824 * 17 58 06.978700 17 59 00.217145 0.00 15 08 35.04424 * 15 08 21.90940 15 08 21.19833 0.00 From catalog imbedded in main SCHED input file. * V1762_CYG 19 07 14.923744 * 19 08 25.790400 19 08 54.920537 0.00 52 20 40.31430 * 52 25 32.63030 52 27 21.64457 0.00 From catalog imbedded in main SCHED input file. * U_SGE 19 16 37.009819 * 19 18 48.408400 19 19 39.902846 0.00 19 31 04.37796 * 19 36 37.72000 19 38 46.59427 0.00 From catalog imbedded in main SCHED input file. * J1308+3546 13 06 03.930570 * 13 08 23.709100 13 09 17.573370 0.00 36 02 36.26230 * 35 46 37.16400 35 40 42.07785 0.00 From catalog imbedded in main SCHED input file. * J1558+6521 15 58 07.280966 * 15 58 35.074700 15 58 48.559887 0.00 65 29 56.59652 * 65 21 29.52000 65 18 25.73687 0.00 From catalog imbedded in main SCHED input file. * J1635+5955 16 34 51.613175 * 16 35 37.648800 16 35 57.760510 0.00 60 01 17.12311 * 59 55 15.07700 59 53 04.23652 0.00 From catalog imbedded in main SCHED input file. * J1756+1535 17 54 37.953478 * 17 56 53.102100 17 57 46.128997 0.00 15 35 39.32359 * 15 35 20.82700 15 35 18.06771 0.00 From catalog imbedded in main SCHED input file. * J1926+5052 19 24 48.893904 * 19 26 06.321700 19 26 37.836548 0.00 50 46 51.95760 * 50 52 57.01700 50 55 12.87391 0.00 From catalog imbedded in main SCHED input file. * J1925+2106 19 23 49.792437 * 19 25 59.605400 19 26 50.490219 0.00 21 00 23.30491 * 21 06 26.16200 21 08 45.80901 0.00 From catalog imbedded in main SCHED input file. 1641+399 16 41 17.606226 * 16 42 58.809963 16 43 39.134355 0.13 * J1642+3948 39 54 10.81487 * 39 48 36.99393 39 46 36.21351 0.10 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.rfc rfc_2018a Petrov and Kovalev, in preparation 52534 observations 1803+784 18 03 39.193522 * 18 00 45.683899 17 59 45.957725 0.50 * J1800+7828 78 27 54.29747 * 78 28 04.01841 78 28 05.09577 0.10 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.rfc rfc_2018a Petrov and Kovalev, in preparation 270614 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 RS_CVN sess219.X1024 1 2 3 4 5 6 7 9 0.133 6.367 AG_DRA sess219.X1024 1 2 3 4 5 6 7 9 0.133 5.998 WW_DRA sess219.X1024 1 2 3 4 5 6 7 9 0.133 6.197 Z_HER sess219.X1024 1 2 3 4 5 6 7 9 0.167 8.073 V1762_CYG sess219.X1024 1 2 3 4 5 6 7 9 0.167 5.079 U_SGE sess219.X1024 1 3 4 5 6 7 9 0.167 6.192 J1308+3546 sess219.X1024 1 2 3 4 5 6 7 9 0.117 5.900 J1558+6521 sess219.X1024 1 2 3 4 5 6 7 9 0.117 5.692 J1635+5955 sess219.X1024 1 2 3 4 5 6 7 9 0.117 5.823 J1756+1535 sess219.X1024 1 2 3 4 5 6 7 9 0.142 7.125 J1926+5052 sess219.X1024 2 3 4 5 6 7 9 0.142 4.345 J1925+2106 sess219.X1024 1 3 4 5 6 7 9 0.142 5.048 J1642+3948 sess219.X1024 1 2 3 4 5 6 7 9 0.050 2.750 J1800+7828 sess219.X1024 1 2 3 4 5 6 7 9 0.050 2.750 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) RS_CVN 95.5 AG_DRA 88.6 WW_DRA 95.5 Z_HER 140.9 V1762_CYG 101.1 U_SGE 129.1 J1308+3546 95.2 J1558+6521 89.9 J1635+5955 96.2 J1756+1535 140.5 J1926+5052 101.3 J1925+2106 126.9 J1642+3948 116.2 J1800+7828 78.2 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