COVER INFORMATION Station: IRBENE (Code Ir ) 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 IRBENE (Code Ir ) 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 17 30 00 J1642+3948 12 24 23 45.7-275.5 -4.3 -44.0 0 0 17 30 00 17 33 00 =1641+399 12 27 23 46.1-274.9 -4.3 -44.1 180 23 17 30 01 17 36 14 J1308+3546 12 30 38 67.2-200.6 -0.6 -13.4 155 23 17 36 14 17 37 14 --- 12 31 38 67.2-200.1 -0.6 -13.1 60 31 17 36 15 17 37 14 RS_CVN 12 31 38 67.3-201.3 -0.7 -13.9 -4 31 No stop 17 39 14 --- 12 33 38 67.4-200.3 -0.6 -13.3 116 46 17 37 15 17 39 14 J1308+3546 12 33 38 67.3-199.1 -0.6 -12.5 -4 46 No stop 17 40 44 --- 12 35 09 67.4-198.3 -0.6 -12.0 86 58 17 39 15 17 40 44 RS_CVN 12 35 09 67.5-199.5 -0.6 -12.8 -4 58 No stop 17 42 44 --- 12 37 09 67.5-198.5 -0.6 -12.1 116 73 17 40 45 17 43 14 J1308+3546 12 37 39 67.5-197.0 -0.5 -11.1 26 73 17 43 14 17 44 44 --- 12 39 09 67.6-196.2 -0.5 -10.6 90 85 17 43 15 17 44 44 RS_CVN 12 39 09 67.6-197.4 -0.5 -11.4 -4 85 No stop 17 46 44 --- 12 41 10 67.7-196.4 -0.5 -10.8 116 100 17 44 45 17 46 44 J1308+3546 12 41 10 67.6-195.1 -0.5 -9.9 -4 100 No stop 17 48 14 --- 12 42 40 67.7-194.4 -0.4 -9.4 86 112 17 46 45 17 48 14 RS_CVN 12 42 40 67.8-195.6 -0.5 -10.2 -4 112 No stop 17 50 14 --- 12 44 40 67.8-194.5 -0.4 -9.6 116 128 17 48 15 17 50 44 J1308+3546 12 45 10 67.8-193.0 -0.4 -8.6 26 128 17 50 44 17 52 14 --- 12 46 41 67.8-192.2 -0.4 -8.0 90 139 17 50 45 17 56 20 J1558+6521 12 50 47 66.9-309.0 -3.1 -87.1 185 139 17 56 20 17 57 20 --- 12 51 47 67.0-308.9 -3.1 -87.3 60 147 17 56 21 17 57 20 AG_DRA 12 51 47 66.7-312.6 -3.2 -90.0 -5 147 No stop 17 59 20 --- 12 53 48 66.9-312.6 -3.1 -90.4 115 162 17 57 21 17 59 20 J1558+6521 12 53 48 67.2-308.9 -3.1 -87.7 -5 162 No stop 18 00 50 --- 12 55 18 67.3-308.9 -3.1 -88.0 85 174 17 59 21 Schedule for IRBENE (Code Ir ) 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 12 55 18 67.0-312.6 -3.1 -90.8 -5 174 No stop 18 02 50 --- 12 57 18 67.2-312.7 -3.1 -91.3 115 189 18 00 51 18 03 20 J1558+6521 12 57 48 67.6-308.9 -3.0 -88.6 25 189 18 03 20 18 04 50 --- 12 59 19 67.8-308.9 -3.0 -88.9 90 201 18 03 21 18 04 50 AG_DRA 12 59 19 67.4-312.7 -3.0 -91.7 -5 201 No stop 18 06 50 --- 13 01 19 67.6-312.7 -3.0 -92.2 115 216 18 04 51 18 06 50 J1558+6521 13 01 19 68.0-308.9 -3.0 -89.4 -5 216 No stop 18 08 20 --- 13 02 49 68.1-308.9 -2.9 -89.7 85 228 18 06 51 18 08 20 AG_DRA 13 02 49 67.8-312.7 -3.0 -92.6 -5 228 No stop 18 10 20 --- 13 04 49 68.0-312.7 -3.0 -93.1 115 243 18 08 21 18 10 50 J1558+6521 13 05 20 68.4-308.9 -2.9 -90.3 25 243 18 10 50 18 12 20 --- 13 06 50 68.5-308.9 -2.9 -90.6 90 255 18 10 51 18 13 19 J1635+5955 13 07 48 63.6-297.2 -3.5 -71.9 50 255 18 13 19 18 14 19 --- 13 08 49 63.7-297.2 -3.5 -72.1 60 263 18 13 20 18 14 19 WW_DRA 13 08 49 63.5-299.1 -3.5 -73.1 -4 263 No stop 18 16 19 --- 13 10 49 63.8-299.0 -3.5 -73.4 116 278 18 14 20 18 16 19 J1635+5955 13 10 49 63.9-297.0 -3.4 -72.4 -4 278 No stop 18 17 49 --- 13 12 19 64.1-296.8 -3.4 -72.6 86 290 18 16 20 18 17 49 WW_DRA 13 12 19 63.9-298.8 -3.5 -73.6 -4 290 No stop 18 19 49 --- 13 14 20 64.2-298.7 -3.4 -73.9 116 305 18 17 50 18 20 19 J1635+5955 13 14 50 64.4-296.6 -3.4 -72.9 26 305 18 20 19 18 21 49 --- 13 16 20 64.6-296.5 -3.3 -73.1 90 317 18 20 20 18 21 49 WW_DRA 13 16 20 64.4-298.5 -3.4 -74.2 -4 317 No stop 18 23 49 --- 13 18 20 64.7-298.4 -3.4 -74.5 116 332 18 21 50 18 23 49 J1635+5955 13 18 20 64.8-296.3 -3.3 -73.4 -4 332 No stop 18 25 19 --- 13 19 50 65.0-296.2 -3.3 -73.6 86 344 18 23 50 18 25 19 WW_DRA 13 19 50 64.8-298.3 -3.3 -74.7 -4 344 No stop 18 27 19 --- 13 21 51 65.1-298.1 -3.3 -75.0 116 359 18 25 20 18 27 49 J1635+5955 13 22 21 65.3-296.0 -3.2 -74.0 26 359 18 27 49 18 29 19 --- 13 23 51 65.5-295.9 -3.2 -74.2 90 371 18 27 50 Schedule for IRBENE (Code Ir ) 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 13 33 24 25.9-258.1 -4.4 -33.0 548 371 18 38 50 18 39 50 --- 13 34 24 26.0-257.9 -4.4 -33.0 60 379 18 38 51 18 39 50 Z_HER 13 34 24 25.5-257.9 -4.4 -32.9 -3 379 No stop 18 41 50 --- 13 36 24 25.7-257.5 -4.4 -32.9 117 394 18 39 51 18 41 50 J1756+1535 13 36 24 26.3-257.4 -4.4 -32.9 -3 394 No stop 18 43 20 --- 13 37 55 26.5-257.1 -4.3 -32.9 87 406 18 41 51 18 43 20 Z_HER 13 37 55 25.9-257.1 -4.4 -32.8 -3 406 No stop 18 45 20 --- 13 39 55 26.2-256.7 -4.3 -32.7 117 421 18 43 21 18 45 50 J1756+1535 13 40 25 26.8-256.5 -4.3 -32.8 27 421 18 45 50 18 47 20 --- 13 41 55 27.0-256.2 -4.3 -32.7 90 433 18 45 51 18 47 20 Z_HER 13 41 55 26.4-256.2 -4.3 -32.7 -3 433 No stop 18 49 20 --- 13 43 56 26.7-255.7 -4.3 -32.6 117 448 18 47 21 18 49 20 J1756+1535 13 43 56 27.2-255.7 -4.2 -32.7 -3 448 No stop 18 50 50 --- 13 45 26 27.4-255.4 -4.2 -32.6 87 460 18 49 21 18 50 50 Z_HER 13 45 26 26.9-255.4 -4.2 -32.5 -3 460 No stop 18 52 50 --- 13 47 26 27.2-254.9 -4.2 -32.5 117 475 18 50 51 18 53 20 J1756+1535 13 47 56 27.8-254.8 -4.2 -32.5 27 475 18 53 20 18 54 50 --- 13 49 26 28.0-254.5 -4.1 -32.5 90 487 18 53 21 18 54 50 Z_HER 13 49 26 27.4-254.5 -4.2 -32.4 -3 487 No stop 18 56 50 --- 13 51 27 27.7-254.0 -4.1 -32.3 117 502 18 54 51 18 56 50 J1756+1535 13 51 27 28.2-254.0 -4.1 -32.4 -3 502 No stop 18 58 20 --- 13 52 57 28.4-253.7 -4.1 -32.3 87 514 18 56 51 19 00 58 J1926+5052 13 55 36 44.2-299.2 -5.5 -48.0 133 514 19 00 58 19 01 58 --- 13 56 36 44.4-299.0 -5.5 -48.1 60 522 19 00 59 19 01 58 V1762_CYG 13 56 36 47.4-298.2 -5.2 -50.9 -5 522 No stop 19 03 58 --- 13 58 37 47.7-297.9 -5.2 -51.1 115 537 19 01 59 19 03 58 J1926+5052 13 58 37 44.6-298.8 -5.5 -48.3 -5 537 No stop 19 05 28 --- 14 00 07 44.8-298.5 -5.4 -48.4 85 549 19 03 59 19 05 28 V1762_CYG 14 00 07 47.9-297.7 -5.1 -51.2 -5 549 No stop 19 07 28 --- 14 02 07 48.1-297.4 -5.1 -51.4 115 564 19 05 29 Schedule for IRBENE (Code Ir ) 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 02 37 45.1-298.2 -5.4 -48.6 25 564 19 07 58 19 09 28 --- 14 04 07 45.2-297.9 -5.4 -48.8 90 576 19 07 59 19 09 28 V1762_CYG 14 04 07 48.3-297.1 -5.1 -51.6 -5 576 No stop 19 11 28 --- 14 06 08 48.6-296.8 -5.0 -51.8 115 591 19 09 29 19 11 28 J1926+5052 14 06 08 45.5-297.6 -5.3 -48.9 -5 591 No stop 19 12 58 --- 14 07 38 45.7-297.4 -5.3 -49.1 85 603 19 11 29 19 12 58 V1762_CYG 14 07 38 48.8-296.6 -5.0 -51.9 -5 603 No stop 19 14 58 --- 14 09 38 49.0-296.3 -5.0 -52.1 115 618 19 12 59 19 15 28 J1926+5052 14 10 08 46.0-297.0 -5.3 -49.3 25 618 19 15 28 19 16 58 --- 14 11 39 46.1-296.8 -5.2 -49.4 90 630 19 15 29 19 16 58 V1762_CYG 14 11 39 49.2-296.0 -5.0 -52.3 -5 630 No stop 19 18 58 --- 14 13 39 49.5-295.7 -4.9 -52.5 115 645 19 16 59 19 18 58 J1926+5052 14 13 39 46.4-296.5 -5.2 -49.6 -5 645 No stop 19 20 28 --- 14 15 09 46.6-296.3 -5.2 -49.7 85 657 19 18 59 19 23 08 J1925+2106 14 17 50 24.5-271.3 -5.2 -35.1 145 657 19 23 08 19 24 08 --- 14 18 50 24.6-271.0 -5.1 -35.1 60 665 19 23 09 19 24 08 U_SGE 14 18 50 24.4-268.6 -5.0 -34.7 -4 665 No stop 19 26 08 --- 14 20 50 24.6-268.2 -5.0 -34.7 116 680 19 24 09 19 26 08 J1925+2106 14 20 50 24.9-270.6 -5.1 -35.1 -4 680 No stop 19 27 38 --- 14 22 20 25.1-270.3 -5.1 -35.1 86 692 19 26 09 19 27 38 U_SGE 14 22 20 24.8-267.8 -5.0 -34.7 -4 692 No stop 19 29 38 --- 14 24 21 25.1-267.4 -4.9 -34.7 116 707 19 27 39 19 30 08 J1925+2106 14 24 51 25.5-269.8 -5.0 -35.1 26 707 19 30 08 19 31 38 --- 14 26 21 25.7-269.5 -5.0 -35.1 90 719 19 30 09 19 31 38 U_SGE 14 26 21 25.4-267.0 -4.9 -34.7 -4 719 No stop 19 33 38 --- 14 28 21 25.7-266.5 -4.9 -34.7 116 734 19 31 39 19 33 38 J1925+2106 14 28 21 25.9-269.0 -5.0 -35.1 -4 734 No stop 19 35 08 --- 14 29 52 26.1-268.7 -4.9 -35.1 86 746 19 33 39 19 35 08 U_SGE 14 29 52 25.9-266.2 -4.8 -34.6 -4 746 No stop 19 37 08 --- 14 31 52 26.1-265.8 -4.8 -34.6 116 761 19 35 09 Schedule for IRBENE (Code Ir ) 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 14 32 22 26.5-268.2 -4.9 -35.1 26 761 19 37 38 19 39 08 --- 14 33 52 26.7-267.9 -4.9 -35.1 90 773 19 37 39 19 39 08 U_SGE 14 33 52 26.4-265.4 -4.8 -34.6 -4 773 No stop 19 41 08 --- 14 35 53 26.7-264.9 -4.7 -34.6 116 788 19 39 09 19 41 08 J1925+2106 14 35 53 26.9-267.4 -4.8 -35.1 -4 788 No stop 19 42 38 --- 14 37 23 27.1-267.1 -4.8 -35.1 86 800 19 41 09 19 55 17 J1800+7828 14 50 03 64.1 19.7 -3.2 -115.3 612 800 19 55 17 19 58 17 =1803+784 14 53 04 64.2 19.5 -3.1 -116.2 180 823 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 --- 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: 9 Station: IRBENE 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) * 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