COVER INFORMATION Station: SVETLOE (Code Sv ) 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 SVETLOE (Code Sv ) 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 12 56 05 49.8 454.5 -3.8 -39.7 0 0 17 30 00 17 33 00 =1641+399 12 59 06 50.1 455.2 -3.7 -39.6 180 23 17 30 01 17 36 14 J1308+3546 13 02 20 65.1 536.6 -0.1 -2.0 88 23 17 36 14 17 37 14 --- 13 03 21 65.1 537.1 -0.1 -1.7 60 31 17 36 15 17 37 14 RS_CVN 13 03 21 65.3 536.0 -0.1 -2.4 -14 31 No stop 17 39 14 --- 13 05 21 65.3 537.0 -0.1 -1.8 106 46 17 37 15 17 39 14 J1308+3546 13 05 21 65.1 538.1 -0.1 -1.2 -15 46 No stop 17 40 44 --- 13 06 51 65.1 538.8 -0.0 -0.7 75 58 17 39 15 17 40 44 RS_CVN 13 06 51 65.3 537.7 -0.1 -1.4 -14 58 No stop 17 42 44 --- 13 08 51 65.3 538.7 -0.0 -0.8 106 73 17 40 45 17 43 14 J1308+3546 13 09 22 65.1 540.0 0.0 0.0 15 73 17 43 14 17 44 44 --- 13 10 52 65.1 540.8 0.0 0.5 90 85 17 43 15 17 44 44 RS_CVN 13 10 52 65.3 539.7 -0.0 -0.2 -14 85 No stop 17 46 44 --- 13 12 52 65.3 540.7 0.0 0.4 106 100 17 44 45 17 46 44 J1308+3546 13 12 52 65.1 541.7 0.1 1.0 -15 100 No stop 17 48 14 --- 13 14 22 65.1 542.5 0.1 1.5 75 112 17 46 45 17 48 14 RS_CVN 13 14 22 65.3 541.4 0.0 0.8 -14 112 No stop 17 50 14 --- 13 16 23 65.3 542.4 0.1 1.4 106 127 17 48 15 17 50 44 J1308+3546 13 16 53 65.1 543.7 0.1 2.2 15 127 17 50 44 17 52 14 --- 13 18 23 65.1 544.4 0.2 2.7 90 138 17 50 45 17 56 20 J1558+6521 13 22 30 71.9 418.0 -2.6 -86.9 95 138 17 56 20 17 57 20 --- 13 23 30 72.0 418.0 -2.6 -87.1 60 146 17 56 21 17 57 20 AG_DRA 13 23 30 71.7 413.3 -2.6 -90.9 -24 146 No stop 17 59 20 --- 13 25 30 71.9 413.3 -2.6 -91.3 96 162 17 57 21 17 59 20 J1558+6521 13 25 30 72.2 418.0 -2.6 -87.5 -24 162 No stop 18 00 50 --- 13 27 00 72.4 418.1 -2.5 -87.9 66 173 17 59 21 Schedule for SVETLOE (Code Sv ) 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 13 27 00 72.1 413.3 -2.6 -91.7 -24 173 No stop 18 02 50 --- 13 29 01 72.3 413.3 -2.5 -92.2 96 188 18 00 51 18 03 20 J1558+6521 13 29 31 72.6 418.1 -2.5 -88.4 5 188 18 03 20 18 04 50 --- 13 31 01 72.8 418.1 -2.5 -88.7 90 200 18 03 21 18 04 50 AG_DRA 13 31 01 72.5 413.3 -2.5 -92.7 -25 200 No stop 18 06 50 --- 13 33 01 72.7 413.2 -2.5 -93.1 95 215 18 04 51 18 06 50 J1558+6521 13 33 01 73.0 418.1 -2.4 -89.2 -25 215 No stop 18 08 20 --- 13 34 32 73.2 418.1 -2.4 -89.5 65 227 18 06 51 18 08 20 AG_DRA 13 34 32 72.8 413.2 -2.5 -93.5 -25 227 No stop 18 10 20 --- 13 36 32 73.0 413.2 -2.4 -94.0 95 242 18 08 21 18 10 50 J1558+6521 13 37 02 73.4 418.1 -2.4 -90.1 5 242 18 10 50 18 12 20 --- 13 38 32 73.6 418.1 -2.3 -90.4 90 254 18 10 51 18 13 19 J1635+5955 13 39 31 68.5 432.2 -2.9 -69.0 20 254 18 13 19 18 14 19 --- 13 40 31 68.6 432.4 -2.9 -69.1 60 262 18 13 20 18 14 19 WW_DRA 13 40 31 68.5 430.0 -3.0 -70.6 -19 262 No stop 18 16 19 --- 13 42 31 68.7 430.2 -2.9 -70.8 101 277 18 14 20 18 16 19 J1635+5955 13 42 31 68.8 432.6 -2.9 -69.3 -19 277 No stop 18 17 49 --- 13 44 02 69.0 432.8 -2.9 -69.5 71 288 18 16 20 18 17 49 WW_DRA 13 44 02 68.9 430.3 -2.9 -71.0 -19 288 No stop 18 19 49 --- 13 46 02 69.1 430.6 -2.9 -71.2 101 304 18 17 50 18 20 19 J1635+5955 13 46 32 69.3 433.1 -2.8 -69.7 11 304 18 20 19 18 21 49 --- 13 48 02 69.5 433.3 -2.8 -69.9 90 315 18 20 20 18 21 49 WW_DRA 13 48 02 69.3 430.8 -2.9 -71.5 -19 315 No stop 18 23 49 --- 13 50 03 69.6 431.0 -2.8 -71.7 101 331 18 21 50 18 23 49 J1635+5955 13 50 03 69.7 433.5 -2.8 -70.1 -19 331 No stop 18 25 19 --- 13 51 33 69.9 433.7 -2.7 -70.2 71 342 18 23 50 18 25 19 WW_DRA 13 51 33 69.8 431.2 -2.8 -71.9 -19 342 No stop 18 27 19 --- 13 53 33 70.0 431.4 -2.8 -72.1 101 358 18 25 20 18 27 49 J1635+5955 13 54 03 70.2 434.0 -2.7 -70.5 11 358 18 27 49 18 29 19 --- 13 55 34 70.4 434.2 -2.7 -70.6 90 369 18 27 50 Schedule for SVETLOE (Code Sv ) 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 05 06 28.9 470.8 -3.9 -28.5 471 369 18 38 50 18 39 50 --- 14 06 07 29.1 471.0 -3.9 -28.5 60 377 18 38 51 18 39 50 Z_HER 14 06 07 28.5 470.9 -3.9 -28.4 -11 377 No stop 18 41 50 --- 14 08 07 28.7 471.4 -3.8 -28.3 109 392 18 39 51 18 41 50 J1756+1535 14 08 07 29.3 471.5 -3.8 -28.4 -12 392 No stop 18 43 20 --- 14 09 37 29.5 471.9 -3.8 -28.3 78 404 18 41 51 18 43 20 Z_HER 14 09 37 28.9 471.8 -3.8 -28.2 -11 404 No stop 18 45 20 --- 14 11 37 29.1 472.3 -3.8 -28.1 109 419 18 43 21 18 45 50 J1756+1535 14 12 08 29.7 472.5 -3.8 -28.2 18 419 18 45 50 18 47 20 --- 14 13 38 29.9 472.8 -3.7 -28.1 90 431 18 45 51 18 47 20 Z_HER 14 13 38 29.4 472.8 -3.8 -28.0 -11 431 No stop 18 49 20 --- 14 15 38 29.6 473.3 -3.7 -27.9 109 446 18 47 21 18 49 20 J1756+1535 14 15 38 30.1 473.3 -3.7 -28.0 -12 446 No stop 18 50 50 --- 14 17 08 30.3 473.7 -3.7 -27.9 78 458 18 49 21 18 50 50 Z_HER 14 17 08 29.8 473.6 -3.7 -27.8 -11 458 No stop 18 52 50 --- 14 19 09 30.0 474.1 -3.7 -27.7 109 473 18 50 51 18 53 20 J1756+1535 14 19 39 30.6 474.3 -3.6 -27.7 18 473 18 53 20 18 54 50 --- 14 21 09 30.8 474.7 -3.6 -27.6 90 485 18 53 21 18 54 50 Z_HER 14 21 09 30.2 474.6 -3.6 -27.6 -11 485 No stop 18 56 50 --- 14 23 09 30.4 475.1 -3.6 -27.5 109 500 18 54 51 18 56 50 J1756+1535 14 23 09 31.0 475.2 -3.6 -27.5 -12 500 No stop 18 58 20 --- 14 24 40 31.2 475.6 -3.6 -27.4 78 512 18 56 51 19 00 58 J1926+5052 14 27 19 49.2 428.6 -5.0 -46.6 86 512 19 00 58 19 01 58 --- 14 28 19 49.3 428.8 -5.0 -46.7 60 519 19 00 59 19 01 58 V1762_CYG 14 28 19 52.4 429.9 -4.7 -49.3 -21 519 No stop 19 03 58 --- 14 30 19 52.6 430.2 -4.6 -49.4 99 535 19 01 59 19 03 58 J1926+5052 14 30 19 49.5 429.1 -4.9 -46.8 -21 535 No stop 19 05 28 --- 14 31 49 49.7 429.4 -4.9 -46.9 69 546 19 03 59 19 05 28 V1762_CYG 14 31 49 52.8 430.5 -4.6 -49.5 -21 546 No stop 19 07 28 --- 14 33 50 53.0 430.8 -4.6 -49.7 99 562 19 05 29 Schedule for SVETLOE (Code Sv ) 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 14 34 20 50.0 429.8 -4.9 -47.1 9 562 19 07 58 19 09 28 --- 14 35 50 50.2 430.0 -4.8 -47.2 90 573 19 07 59 19 09 28 V1762_CYG 14 35 50 53.3 431.1 -4.6 -49.8 -21 573 No stop 19 11 28 --- 14 37 50 53.5 431.4 -4.5 -49.9 99 588 19 09 29 19 11 28 J1926+5052 14 37 50 50.4 430.4 -4.8 -47.3 -21 588 No stop 19 12 58 --- 14 39 20 50.6 430.6 -4.8 -47.4 69 600 19 11 29 19 12 58 V1762_CYG 14 39 20 53.7 431.7 -4.5 -50.0 -21 600 No stop 19 14 58 --- 14 41 21 53.9 432.0 -4.5 -50.2 99 615 19 12 59 19 15 28 J1926+5052 14 41 51 50.9 431.0 -4.7 -47.6 9 615 19 15 28 19 16 58 --- 14 43 21 51.1 431.3 -4.7 -47.7 90 627 19 15 29 19 16 58 V1762_CYG 14 43 21 54.1 432.4 -4.4 -50.3 -21 627 No stop 19 18 58 --- 14 45 21 54.4 432.7 -4.4 -50.4 99 642 19 16 59 19 18 58 J1926+5052 14 45 21 51.3 431.6 -4.7 -47.8 -21 642 No stop 19 20 28 --- 14 46 52 51.5 431.9 -4.7 -47.9 69 654 19 18 59 19 23 08 J1925+2106 14 49 32 28.4 457.1 -4.6 -31.6 99 654 19 23 08 19 24 08 --- 14 50 32 28.6 457.4 -4.6 -31.5 60 662 19 23 09 19 24 08 U_SGE 14 50 32 28.1 459.9 -4.5 -31.0 -19 662 No stop 19 26 08 --- 14 52 33 28.4 460.3 -4.5 -30.9 101 677 19 24 09 19 26 08 J1925+2106 14 52 33 28.8 457.8 -4.6 -31.5 -19 677 No stop 19 27 38 --- 14 54 03 29.0 458.2 -4.5 -31.5 71 688 19 26 09 19 27 38 U_SGE 14 54 03 28.6 460.7 -4.4 -30.9 -19 688 No stop 19 29 38 --- 14 56 03 28.8 461.1 -4.4 -30.8 101 704 19 27 39 19 30 08 J1925+2106 14 56 33 29.3 458.7 -4.5 -31.4 11 704 19 30 08 19 31 38 --- 14 58 04 29.5 459.1 -4.5 -31.4 90 715 19 30 09 19 31 38 U_SGE 14 58 04 29.0 461.6 -4.4 -30.8 -19 715 No stop 19 33 38 --- 15 00 04 29.3 462.1 -4.3 -30.7 101 731 19 31 39 19 33 38 J1925+2106 15 00 04 29.7 459.5 -4.4 -31.3 -19 731 No stop 19 35 08 --- 15 01 34 29.9 459.9 -4.4 -31.3 71 742 19 33 39 19 35 08 U_SGE 15 01 34 29.5 462.4 -4.3 -30.7 -19 742 No stop 19 37 08 --- 15 03 34 29.7 462.9 -4.3 -30.6 101 758 19 35 09 Schedule for SVETLOE (Code Sv ) 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 04 05 30.2 460.5 -4.4 -31.2 11 758 19 37 38 19 39 08 --- 15 05 35 30.4 460.8 -4.4 -31.2 90 769 19 37 39 19 39 08 U_SGE 15 05 35 30.0 463.4 -4.2 -30.5 -19 769 No stop 19 41 08 --- 15 07 35 30.2 463.8 -4.2 -30.5 101 785 19 39 09 19 41 08 J1925+2106 15 07 35 30.6 461.3 -4.3 -31.2 -19 785 No stop 19 42 38 --- 15 09 05 30.8 461.6 -4.3 -31.1 71 796 19 41 09 19 55 17 J1800+7828 15 21 46 68.3 380.1 -2.6 -122.3 653 796 19 55 17 19 58 17 =1803+784 15 24 46 68.4 379.9 -2.6 -123.2 180 819 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: 1 Station: SVETLOE 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