COVER INFORMATION Station: TIANMA65 (Code T6 ) Experiment: new UCD -6cm Exp. Code: EC077A Schedule Version: 2.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Juan B. Climent Address: Dpto. Astronomia, Univ. Valencia Dr. Moliner 50 E-46100 Burjassot Valencia, Spain Phone: +34 963543078 EMAIL: cliojuan@uv.es Fax: +34 963543084 Phone during observation: +34 963543078, +34629509130 Observing mode: Phase-referencing at 6cm (2048 Mb/s) Notes: Dual Pol Schedule for TIANMA65 (Code T6 ) Page 2 new UCD -6cm 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 ---------------------------------------------------------------------------------------- --- Sat 12 Jun 2021 Day 163 --- Next scan frequencies: 4830.49 4830.49 4830.49 4830.49 4894.49 4894.49 4894.49 4894.49 4958.49 4958.49 4958.49 4958.49 5022.49 5022.49 5022.49 5022.49 Next BBC frequencies: 630.49 630.49 630.49 630.49 694.49 694.49 694.49 694.49 758.49 758.49 758.49 758.49 822.49 822.49 822.49 822.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 12 30 00 1123+264 13 58 46 56.5 271.1 2.5 72.4 0 0 12 30 00 12 35 00 --- 14 03 47 55.4 271.7 2.6 72.3 300 77 12 30 01 12 38 00 J1125+2610 14 06 48 54.7 272.0 2.7 72.3 178 77 12 38 00 12 40 00 =1123+264 14 08 48 54.3 272.3 2.7 72.3 120 108 12 38 01 12 40 00 EQJ1122+2550 14 08 48 53.6 272.1 2.7 71.8 -5 108 No stop 12 44 00 --- 14 12 49 52.7 272.6 2.8 71.7 235 170 12 40 01 12 44 00 J1125+2610 14 12 49 53.5 272.7 2.8 72.2 -5 170 No stop 12 46 00 =1123+264 14 14 49 53.0 273.0 2.8 72.2 115 201 12 44 01 12 46 00 EQJ1122+2550 14 14 49 52.3 272.8 2.8 71.7 -5 201 No stop 12 50 00 --- 14 18 50 51.4 273.3 2.9 71.6 235 263 12 46 01 12 50 30 J1125+2610 14 19 20 52.1 273.5 2.9 72.1 25 263 12 50 30 12 52 30 =1123+264 14 21 20 51.6 273.7 2.9 72.0 120 294 12 50 31 12 52 30 EQJ1122+2550 14 21 20 50.9 273.5 3.0 71.6 -5 294 No stop 12 56 30 --- 14 25 21 50.0 274.0 3.0 71.5 235 356 12 52 31 12 56 30 J1125+2610 14 25 21 50.8 274.2 3.0 71.9 -5 356 No stop 12 58 30 =1123+264 14 27 21 50.4 274.4 3.0 71.9 115 386 12 56 31 12 58 30 EQJ1122+2550 14 27 21 49.6 274.2 3.1 71.4 -5 386 No stop 13 02 30 --- 14 31 22 48.8 274.6 3.1 71.3 235 448 12 58 31 13 03 00 J1125+2610 14 31 52 49.4 274.9 3.1 71.8 25 448 13 03 00 13 05 00 =1123+264 14 33 52 49.0 275.1 3.1 71.7 120 479 13 03 01 13 05 00 EQJ1122+2550 14 33 52 48.2 274.9 3.2 71.3 -5 479 No stop 13 09 00 --- 14 37 53 47.4 275.4 3.2 71.2 235 541 13 05 01 13 09 00 J1125+2610 14 37 53 48.1 275.5 3.2 71.6 -5 541 No stop 13 11 00 =1123+264 14 39 53 47.7 275.7 3.2 71.5 115 572 13 09 01 13 11 00 EQJ1122+2550 14 39 53 46.9 275.6 3.3 71.1 -5 572 No stop 13 15 00 --- 14 43 54 46.1 276.0 3.3 71.0 235 634 13 11 01 Schedule for TIANMA65 (Code T6 ) Page 3 new UCD -6cm 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 ---------------------------------------------------------------------------------------- --- Sat 12 Jun 2021 Day 163 --- 13 15 30 J1125+2610 14 44 24 46.7 276.2 3.3 71.4 25 634 13 15 30 13 17 30 =1123+264 14 46 24 46.3 276.4 3.3 71.3 120 665 13 15 31 13 17 30 EQJ1122+2550 14 46 24 45.6 276.3 3.4 70.9 -5 665 No stop 13 21 30 --- 14 50 25 44.7 276.7 3.4 70.8 235 727 13 17 31 13 21 30 J1125+2610 14 50 25 45.4 276.8 3.4 71.2 -5 727 No stop 13 23 30 =1123+264 14 52 25 45.0 277.0 3.4 71.1 115 757 13 21 31 13 23 30 EQJ1122+2550 14 52 25 44.3 276.9 3.5 70.7 -5 757 No stop 13 27 30 --- 14 56 26 43.4 277.3 3.5 70.5 235 819 13 23 31 13 28 00 J1125+2610 14 56 56 44.1 277.5 3.5 70.9 25 819 13 28 00 13 30 00 =1123+264 14 58 56 43.6 277.7 3.5 70.8 120 850 13 28 01 13 30 00 EQJ1122+2550 14 58 56 42.9 277.6 3.6 70.4 -5 850 No stop 13 34 00 --- 15 02 57 42.0 278.0 3.6 70.3 235 912 13 30 01 13 34 00 J1125+2610 15 02 57 42.8 278.1 3.6 70.7 -5 912 No stop 13 36 00 =1123+264 15 04 57 42.4 278.3 3.6 70.6 115 943 13 34 01 13 36 00 EQJ1122+2550 15 04 57 41.6 278.2 3.7 70.2 -5 943 No stop 13 40 00 --- 15 08 58 40.8 278.6 3.7 70.0 235 1005 13 36 01 13 40 30 J1125+2610 15 09 28 41.4 278.8 3.7 70.4 25 1005 13 40 30 13 42 30 =1123+264 15 11 28 41.0 279.0 3.7 70.3 120 1036 13 40 31 13 42 30 EQJ1122+2550 15 11 28 40.2 278.8 3.8 69.9 -5 1036 No stop 13 46 30 --- 15 15 29 39.4 279.2 3.9 69.8 235 1098 13 42 31 13 46 30 J1125+2610 15 15 29 40.1 279.4 3.8 70.1 -5 1098 No stop 13 48 30 =1123+264 15 17 29 39.7 279.6 3.8 70.1 115 1128 13 46 31 13 48 30 EQJ1122+2550 15 17 29 39.0 279.5 3.9 69.7 -5 1128 No stop 13 52 30 --- 15 21 30 38.1 279.9 4.0 69.5 235 1190 13 48 31 13 53 00 J1125+2610 15 22 00 38.8 280.0 3.9 69.8 25 1190 13 53 00 13 55 00 =1123+264 15 24 00 38.3 280.2 3.9 69.7 120 1221 13 53 01 13 55 00 EQJ1122+2550 15 24 00 37.6 280.1 4.0 69.4 -5 1221 No stop 13 59 00 --- 15 28 01 36.7 280.5 4.1 69.2 235 1283 13 55 01 13 59 00 J1125+2610 15 28 01 37.5 280.6 4.0 69.5 -5 1283 No stop 14 01 00 =1123+264 15 30 01 37.1 280.8 4.1 69.4 115 1314 13 59 01 Schedule for TIANMA65 (Code T6 ) Page 4 new UCD -6cm 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 ---------------------------------------------------------------------------------------- --- Sat 12 Jun 2021 Day 163 --- 14 01 00 EQJ1122+2550 15 30 01 36.3 280.7 4.1 69.1 -5 1314 No stop 14 05 00 --- 15 34 02 35.5 281.1 4.2 68.9 235 1376 14 01 01 14 05 30 J1125+2610 15 34 32 36.1 281.2 4.1 69.2 25 1376 14 05 30 14 07 30 =1123+264 15 36 32 35.7 281.4 4.2 69.1 120 1407 14 05 31 14 07 30 EQJ1122+2550 15 36 32 35.0 281.4 4.2 68.7 -5 1407 No stop 14 11 30 --- 15 40 33 34.1 281.8 4.3 68.5 235 1469 14 07 31 14 11 30 J1125+2610 15 40 33 34.9 281.8 4.2 68.9 -5 1469 No stop 14 13 30 =1123+264 15 42 33 34.4 282.0 4.3 68.8 115 1499 14 11 31 14 13 30 EQJ1122+2550 15 42 33 33.7 282.0 4.3 68.4 -5 1499 No stop 14 17 30 --- 15 46 34 32.8 282.4 4.4 68.2 235 1561 14 13 31 14 18 00 J1125+2610 15 47 04 33.5 282.5 4.3 68.5 25 1561 14 18 00 14 20 00 =1123+264 15 49 04 33.1 282.7 4.4 68.4 120 1592 14 18 01 14 20 00 EQJ1122+2550 15 49 04 32.3 282.6 4.4 68.1 -5 1592 No stop 14 24 00 --- 15 53 05 31.5 283.0 4.5 67.8 235 1654 14 20 01 14 24 00 J1125+2610 15 53 05 32.2 283.1 4.4 68.2 -5 1654 No stop 14 26 00 =1123+264 15 55 05 31.8 283.3 4.5 68.1 115 1685 14 24 01 14 26 00 EQJ1122+2550 15 55 05 31.1 283.2 4.5 67.7 -5 1685 No stop 14 30 00 --- 15 59 06 30.2 283.6 4.6 67.5 235 1747 14 26 01 14 30 30 J1125+2610 15 59 36 30.9 283.7 4.5 67.8 25 1747 14 30 30 14 32 30 =1123+264 16 01 36 30.5 283.9 4.6 67.7 120 1778 14 30 31 14 32 30 EQJ1122+2550 16 01 36 29.7 283.9 4.6 67.4 -5 1778 No stop 14 36 30 --- 16 05 37 28.9 284.3 4.7 67.1 235 1840 14 32 31 14 36 30 J1125+2610 16 05 37 29.6 284.3 4.6 67.5 -5 1840 No stop 14 38 30 =1123+264 16 07 37 29.2 284.5 4.7 67.3 115 1870 14 36 31 14 38 30 EQJ1122+2550 16 07 37 28.5 284.5 4.7 67.0 -5 1870 No stop 14 42 30 --- 16 11 38 27.6 284.9 4.8 66.7 235 1932 14 38 31 14 43 00 J1125+2610 16 12 08 28.3 285.0 4.8 67.1 25 1932 14 43 00 14 45 00 =1123+264 16 14 08 27.9 285.2 4.8 66.9 120 1963 14 43 01 14 45 00 EQJ1122+2550 16 14 08 27.1 285.1 4.8 66.6 -5 1963 No stop 14 49 00 --- 16 18 09 26.3 285.5 4.9 66.3 235 2025 14 45 01 Schedule for TIANMA65 (Code T6 ) Page 5 new UCD -6cm 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 ---------------------------------------------------------------------------------------- --- Sat 12 Jun 2021 Day 163 --- 14 49 00 J1125+2610 16 18 09 27.0 285.6 4.9 66.7 -5 2025 No stop 14 51 00 =1123+264 16 20 09 26.6 285.8 4.9 66.6 115 2056 14 49 01 14 51 00 EQJ1122+2550 16 20 09 25.9 285.7 4.9 66.2 -5 2056 No stop 14 55 00 --- 16 24 10 25.0 286.1 5.0 65.9 235 2118 14 51 01 14 55 30 J1125+2610 16 24 40 25.7 286.2 5.0 66.3 25 2118 14 55 30 14 57 30 =1123+264 16 26 41 25.3 286.4 5.0 66.1 120 2149 14 55 31 14 57 30 EQJ1122+2550 16 26 41 24.5 286.4 5.0 65.8 -5 2149 No stop 15 01 30 --- 16 30 41 23.7 286.8 5.1 65.5 235 2211 14 57 31 15 01 30 J1125+2610 16 30 41 24.5 286.8 5.1 65.9 -5 2211 No stop 15 03 30 =1123+264 16 32 42 24.0 287.0 5.1 65.7 115 2241 15 01 31 15 03 30 EQJ1122+2550 16 32 42 23.3 287.0 5.1 65.4 -5 2241 No stop 15 07 30 --- 16 36 42 22.5 287.4 5.2 65.1 235 2303 15 03 31 15 08 00 J1125+2610 16 37 12 23.1 287.5 5.2 65.4 25 2303 15 08 00 15 10 00 =1123+264 16 39 13 22.7 287.7 5.2 65.3 120 2334 15 08 01 15 10 00 EQJ1122+2550 16 39 13 22.0 287.7 5.3 64.9 -5 2334 No stop 15 14 00 --- 16 43 13 21.1 288.1 5.3 64.6 235 2396 15 10 01 15 14 00 J1125+2610 16 43 13 21.9 288.1 5.3 65.0 -5 2396 No stop 15 16 00 =1123+264 16 45 14 21.5 288.3 5.3 64.8 115 2427 15 14 01 15 16 00 EQJ1122+2550 16 45 14 20.7 288.3 5.4 64.5 -5 2427 No stop 15 20 00 --- 16 49 14 19.9 288.7 5.4 64.2 235 2489 15 16 01 15 20 30 J1125+2610 16 49 44 20.6 288.8 5.4 64.5 25 2489 15 20 30 15 22 30 =1123+264 16 51 45 20.2 289.0 5.4 64.4 120 2520 15 20 31 15 22 30 EQJ1122+2550 16 51 45 19.4 289.0 5.5 64.0 -5 2520 No stop 15 26 30 --- 16 55 45 18.6 289.4 5.5 63.7 235 2582 15 22 31 15 26 30 J1125+2610 16 55 45 19.4 289.4 5.5 64.1 -5 2582 No stop 15 28 30 =1123+264 16 57 46 19.0 289.6 5.5 63.9 115 2612 15 26 31 15 28 30 EQJ1122+2550 16 57 46 18.2 289.6 5.6 63.6 -5 2612 No stop 15 32 30 --- 17 01 46 17.4 290.0 5.6 63.3 235 2674 15 28 31 15 33 00 J1125+2610 17 02 16 18.0 290.1 5.6 63.6 25 2674 15 33 00 15 35 00 =1123+264 17 04 17 17.6 290.3 5.6 63.4 120 2705 15 33 01 Schedule for TIANMA65 (Code T6 ) Page 6 new UCD -6cm 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 ---------------------------------------------------------------------------------------- --- Sat 12 Jun 2021 Day 163 --- 15 35 00 EQJ1122+2550 17 04 17 16.9 290.3 5.7 63.1 -5 2705 No stop 15 39 00 --- 17 08 17 16.1 290.7 5.7 62.8 235 2767 15 35 01 15 39 00 J1125+2610 17 08 17 16.8 290.7 5.7 63.1 -5 2767 No stop 15 41 00 =1123+264 17 10 18 16.4 290.9 5.7 62.9 115 2798 15 39 01 15 41 00 EQJ1122+2550 17 10 18 15.7 290.9 5.8 62.6 -5 2798 No stop 15 45 00 --- 17 14 18 14.9 291.4 5.8 62.3 235 2860 15 41 01 15 45 30 J1125+2610 17 14 48 15.5 291.4 5.8 62.6 25 2860 15 45 30 15 47 30 =1123+264 17 16 49 15.1 291.6 5.8 62.4 120 2891 15 45 31 15 47 30 EQJ1122+2550 17 16 49 14.4 291.6 5.9 62.1 -5 2891 No stop 15 51 30 --- 17 20 49 13.6 292.1 5.9 61.8 235 2953 15 47 31 15 51 30 J1125+2610 17 20 49 14.3 292.0 5.9 62.1 -5 2953 No stop 15 53 30 =1123+264 17 22 50 13.9 292.3 5.9 61.9 115 2983 15 51 31 15 53 30 EQJ1122+2550 17 22 50 13.2 292.3 6.0 61.6 -5 2983 No stop 15 57 30 --- 17 26 50 12.4 292.7 6.0 61.2 235 3045 15 53 31 15 58 00 J1125+2610 17 27 20 13.0 292.8 6.0 61.5 25 3045 15 58 00 16 00 00 =1123+264 17 29 21 12.7 293.0 6.0 61.4 120 3076 15 58 01 16 00 00 EQJ1122+2550 17 29 21 11.9 293.0 6.1 61.0 -5 3076 No stop 16 04 00 --- 17 33 21 11.1 293.5 6.2 60.7 235 3138 16 00 01 16 04 00 J1125+2610 17 33 21 11.9 293.4 6.1 61.0 -5 3138 No stop 16 06 00 =1123+264 17 35 22 11.5 293.6 6.1 60.8 115 3169 16 04 01 16 06 00 EQJ1122+2550 17 35 22 10.7 293.7 6.2 60.5 -5 3169 No stop 16 10 00 --- 17 39 22 9.9 294.1 6.3 60.2 235 3231 16 06 01 16 10 30 J1125+2610 17 39 53 10.6 294.2 6.2 60.4 25 3231 16 10 30 16 12 30 =1123+264 17 41 53 10.2 294.4 6.2 60.3 120 3262 16 10 31 16 12 30 EQJ1122+2550 17 41 53 9.4 294.4 6.3 59.9 -5 3262 No stop 16 16 30 --- 17 45 54 8.7 294.9 6.4 59.6 235 3324 16 12 31 16 16 30 J1125+2610 17 45 54 9.4 294.8 6.3 59.9 -5 3324 No stop 16 18 30 =1123+264 17 47 54 9.0 295.1 6.3 59.7 115 3354 16 16 31 16 18 30 EQJ1122+2550 17 47 54 8.3 295.1 6.4 59.4 -5 3354 No stop 16 22 30 --- 17 51 55 7.5 295.6 6.5 59.0 235 3416 16 18 31 Schedule for TIANMA65 (Code T6 ) Page 7 new UCD -6cm 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 ---------------------------------------------------------------------------------------- --- Sat 12 Jun 2021 Day 163 --- 16 23 00 J1125+2610 17 52 25 8.2 295.6 6.4 59.3 25 3416 16 23 00 16 25 00 =1123+264 17 54 25 7.8 295.8 6.5 59.1 120 3447 16 23 01 16 25 00 EQJ1122+2550 17 54 25 7.0 295.9 6.5 58.8 -5 3447 No stop 16 29 00 --- 17 58 26 6.2 296.4 6.6 D 58.4 0 3509 16 25 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess221.C2048 --- 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: 14 Station: TIANMA65 Total bit rate: 2048 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 4200.00 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 5 1 5 2 6 2 6 3 7 3 7 4 8 4 8 BBC SB= L L U U L L U U L L U U L L U U IF = A4 B3 A4 B3 A4 B3 A4 B3 A4 B3 A4 B3 A4 B3 A4 B3 The following frequency sets based on these setups were used. Frequency Set: 7 Setup file default. Used with PCAL = off LO sum= 4830.49 4830.49 4830.49 4830.49 4894.49 4894.49 4894.49 4894.49 4958.49 4958.49 4958.49 4958.49 5022.49 5022.49 5022.49 5022.49 BBC fr= 630.49 630.49 630.49 630.49 694.49 694.49 694.49 694.49 758.49 758.49 758.49 758.49 822.49 822.49 822.49 822.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 7 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) * EQJ1122+2550 11 20 15.543304 * 11 22 54.730001 11 24 01.889038 0.00 26 06 49.42045 * 25 50 21.50002 25 43 31.63516 0.00 From catalog imbedded in main SCHED input file. * J1125+2610 11 23 14.869303 * 11 25 53.711923 11 27 00.745970 0.11 * 1123+264 26 26 49.99097 * 26 10 19.97857 26 03 29.35229 0.10 J1125+26 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.vlba.2012jul rfc_2012b Petrov, 2012, unpublished 2729 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 EQJ1122+255sess221.C2048 1 2 3 4 5 6 7 8 9 10 11 12 5.600 457.623 1123+264 sess221.C2048 1 2 3 4 5 6 7 8 9 10 11 12 2.992 230.332 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) EQJ1122+2550 80.0 J1125+2610 80.5 1123+264 80.5 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