COVER INFORMATION Station: TIANMA65 (Code T6 ) Experiment: VLBI observations of a unique strong lensing cluster to test H0 tension Exp. Code: es116a Schedule Version: 3.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Cristiana Spingola Address: INAF Istituto di Radioastronomia via P. Gobetti 101 40129 Bologna Italy Phone: +39 3938231373 EMAIL: cristiana.spingola@inaf.it Fax: Phone during observation: Observing mode: 18cm 1024-8-2 Notes: PCAL off, please. Schedule for TIANMA65 (Code T6 ) Page 2 VLBI observations of a unique strong lensing cluster to test H0 tension 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 ---------------------------------------------------------------------------------------- --- Sun 2 Mar 2025 Day 61 --- Next scan frequencies: 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 Next BBC frequencies: 643.51 643.51 643.51 643.51 579.51 579.51 579.51 579.51 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 17 30 00 1013+2449 12 17 34 62.3 264.3 2.0 69.7 0 0 17 30 00 17 33 00 --- 12 20 35 61.7 264.8 2.1 69.8 180 23 17 30 01 17 35 30 4C39.25 12 23 05 53.8 294.7 2.9 88.8 88 23 17 35 30 17 41 30 --- 12 29 06 52.6 294.8 3.0 87.9 360 70 17 35 31 17 44 00 1013+2449 12 31 37 59.3 266.5 2.3 70.2 91 70 17 44 00 17 45 30 --- 12 33 07 59.0 266.8 2.3 70.2 90 81 17 44 01 17 45 30 J1029A 12 33 07 62.8 267.5 2.0 72.6 -17 81 No stop 17 49 00 --- 12 36 37 62.0 268.0 2.1 72.6 193 108 17 45 31 17 49 30 1013+2449 12 37 08 58.2 267.3 2.4 70.3 13 108 17 49 30 17 51 00 --- 12 38 38 57.8 267.6 2.4 70.3 90 120 17 49 31 17 51 00 J1029A 12 38 38 61.6 268.3 2.1 72.6 -17 120 No stop 17 54 30 --- 12 42 08 60.9 268.8 2.2 72.7 193 147 17 51 01 17 57 00 1013+2449 12 44 39 56.6 268.4 2.5 70.4 133 147 17 57 00 17 58 30 --- 12 46 09 56.2 268.6 2.5 70.4 90 158 17 57 01 17 58 30 J1029A 12 46 09 60.0 269.4 2.3 72.7 -17 158 No stop 18 02 00 --- 12 49 40 59.3 269.8 2.3 72.7 193 185 17 58 31 18 02 30 1013+2449 12 50 10 55.4 269.2 2.6 70.5 13 185 18 02 30 18 04 00 --- 12 51 40 55.1 269.4 2.6 70.5 90 197 18 02 31 18 04 00 J1029A 12 51 40 58.8 270.1 2.4 72.7 -17 197 No stop 18 07 30 --- 12 55 11 58.1 270.5 2.4 72.7 193 224 18 04 01 18 10 00 1013+2449 12 57 41 53.8 270.1 2.7 70.5 133 224 18 10 00 18 11 30 --- 12 59 11 53.4 270.3 2.7 70.5 90 236 18 10 01 18 11 30 J1029B 12 59 11 57.2 271.0 2.5 72.7 -17 236 No stop 18 15 00 --- 13 02 42 56.5 271.5 2.5 72.7 193 263 18 11 31 18 15 30 1013+2449 13 03 12 52.6 270.8 2.8 70.5 13 263 18 15 30 18 17 00 --- 13 04 42 52.3 271.0 2.8 70.5 90 274 18 15 31 18 17 00 J1029B 13 04 42 56.0 271.7 2.6 72.7 -17 274 No stop 18 20 30 --- 13 08 13 55.3 272.1 2.6 72.6 193 301 18 17 01 Schedule for TIANMA65 (Code T6 ) Page 3 VLBI observations of a unique strong lensing cluster to test H0 tension 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 ---------------------------------------------------------------------------------------- --- Sun 2 Mar 2025 Day 61 --- 18 23 00 1013+2449 13 10 43 51.0 271.8 2.9 70.4 133 301 18 23 00 18 24 30 --- 13 12 13 50.7 271.9 2.9 70.4 90 313 18 23 01 18 24 30 J1029B 13 12 13 54.4 272.6 2.7 72.5 -17 313 No stop 18 28 00 --- 13 15 44 53.7 273.0 2.8 72.5 193 340 18 24 31 18 28 30 1013+2449 13 16 14 49.8 272.4 3.0 70.3 13 340 18 28 30 18 30 00 --- 13 17 44 49.5 272.6 3.0 70.3 90 352 18 28 31 18 30 00 J1029B 13 17 44 53.3 273.2 2.8 72.4 -17 352 No stop 18 33 30 --- 13 21 15 52.5 273.6 2.8 72.4 193 379 18 30 01 18 36 00 1013+2449 13 23 45 48.2 273.3 3.1 70.2 133 379 18 36 00 18 37 30 --- 13 25 15 47.9 273.5 3.2 70.2 90 390 18 36 01 18 37 30 G2 13 25 15 51.6 274.1 2.9 72.3 -17 390 No stop 18 41 00 --- 13 28 46 50.9 274.4 3.0 72.2 193 417 18 37 31 18 41 30 1013+2449 13 29 16 47.0 273.9 3.2 70.1 13 417 18 41 30 18 43 00 --- 13 30 46 46.7 274.1 3.3 70.1 90 429 18 41 31 18 43 00 G2 13 30 46 50.5 274.7 3.0 72.1 -17 429 No stop 18 46 30 --- 13 34 17 49.7 275.0 3.1 72.0 193 456 18 43 01 18 49 00 1013+2449 13 36 47 45.4 274.8 3.4 69.9 133 456 18 49 00 18 50 30 --- 13 38 18 45.1 274.9 3.4 69.9 90 468 18 49 01 18 53 00 4C39.25 13 40 48 38.8 297.2 4.2 78.3 104 468 18 53 00 18 59 00 --- 13 46 49 37.7 297.5 4.3 77.6 360 514 18 53 01 19 01 30 1013+2449 13 49 19 42.7 276.1 3.6 69.6 105 514 19 01 30 19 03 00 --- 13 50 50 42.4 276.3 3.6 69.5 90 526 19 01 31 19 03 00 J1029A 13 50 50 46.2 276.8 3.3 71.5 -17 526 No stop 19 06 30 --- 13 54 20 45.4 277.1 3.4 71.4 193 553 19 03 01 19 07 00 1013+2449 13 54 50 41.6 276.7 3.7 69.4 13 553 19 07 00 19 08 30 --- 13 56 21 41.2 276.9 3.7 69.3 90 564 19 07 01 19 08 30 J1029A 13 56 21 45.0 277.3 3.4 71.3 -17 564 No stop 19 12 00 --- 13 59 51 44.3 277.7 3.5 71.1 193 591 19 08 31 19 14 30 1013+2449 14 02 22 40.0 277.5 3.8 69.1 133 591 19 14 30 19 16 00 --- 14 03 52 39.6 277.7 3.8 69.1 90 603 19 14 31 Schedule for TIANMA65 (Code T6 ) Page 4 VLBI observations of a unique strong lensing cluster to test H0 tension 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 ---------------------------------------------------------------------------------------- --- Sun 2 Mar 2025 Day 61 --- 19 16 00 J1029B 14 03 52 43.4 278.1 3.6 71.0 -17 603 No stop 19 19 30 --- 14 07 22 42.7 278.4 3.6 70.8 193 630 19 16 01 19 20 00 1013+2449 14 07 52 38.8 278.1 3.9 68.9 13 630 19 20 00 19 21 30 --- 14 09 23 38.5 278.3 3.9 68.9 90 642 19 20 01 19 21 30 J1029B 14 09 23 42.3 278.6 3.6 70.7 -17 642 No stop 19 25 00 --- 14 12 53 41.5 279.0 3.7 70.6 193 669 19 21 31 19 27 30 1013+2449 14 15 24 37.2 278.9 4.0 68.6 133 669 19 27 30 19 29 00 --- 14 16 54 36.9 279.1 4.0 68.6 90 680 19 27 31 19 29 00 G2 14 16 54 40.7 279.4 3.8 70.4 -17 680 No stop 19 32 30 --- 14 20 24 39.9 279.7 3.8 70.2 193 707 19 29 01 19 33 00 1013+2449 14 20 55 36.0 279.5 4.1 68.4 13 707 19 33 00 19 34 30 --- 14 22 25 35.7 279.6 4.1 68.3 90 719 19 33 01 19 34 30 G2 14 22 25 39.5 279.9 3.9 70.2 -17 719 No stop 19 38 00 --- 14 25 55 38.8 280.3 3.9 70.0 193 746 19 34 31 19 40 30 1013+2449 14 28 26 34.4 280.3 4.2 68.0 133 746 19 40 30 19 42 00 --- 14 29 56 34.1 280.4 4.2 68.0 90 757 19 40 31 19 42 00 J1029A 14 29 56 37.9 280.7 4.0 69.8 -17 757 No stop 19 45 30 --- 14 33 27 37.2 281.0 4.0 69.6 193 785 19 42 01 19 46 00 1013+2449 14 33 57 33.3 280.8 4.3 67.8 13 785 19 46 00 19 47 30 --- 14 35 27 33.0 281.0 4.3 67.7 90 796 19 46 01 19 47 30 J1029A 14 35 27 36.8 281.2 4.1 69.5 -17 796 No stop 19 51 00 --- 14 38 58 36.0 281.6 4.1 69.3 193 823 19 47 31 19 53 30 1013+2449 14 41 28 31.7 281.6 4.4 67.4 133 823 19 53 30 19 55 00 --- 14 42 58 31.4 281.7 4.5 67.3 90 835 19 53 31 19 55 00 J1029B 14 42 58 35.2 282.0 4.2 69.1 -17 835 No stop 19 58 30 --- 14 46 29 34.5 282.3 4.3 68.9 193 862 19 55 01 19 59 00 1013+2449 14 46 59 30.5 282.2 4.5 67.1 13 862 19 59 00 20 00 30 --- 14 48 29 30.2 282.3 4.6 67.1 90 873 19 59 01 20 00 30 J1029B 14 48 29 34.0 282.5 4.3 68.8 -17 873 No stop 20 04 00 --- 14 52 00 33.3 282.8 4.4 68.6 193 900 20 00 31 Schedule for TIANMA65 (Code T6 ) Page 5 VLBI observations of a unique strong lensing cluster to test H0 tension 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 ---------------------------------------------------------------------------------------- --- Sun 2 Mar 2025 Day 61 --- 20 06 30 1013+2449 14 54 30 29.0 282.9 4.7 66.7 133 900 20 06 30 20 08 00 --- 14 56 00 28.7 283.1 4.7 66.6 90 912 20 06 31 20 08 00 J1029A 14 56 00 32.5 283.2 4.4 68.4 -17 912 No stop 20 11 30 --- 14 59 31 31.7 283.6 4.5 68.2 193 939 20 08 01 20 12 00 1013+2449 15 00 01 27.8 283.5 4.7 66.4 13 939 20 12 00 20 13 30 --- 15 01 31 27.5 283.6 4.8 66.3 90 951 20 12 01 20 13 30 J1029A 15 01 31 31.3 283.8 4.5 68.0 -17 951 No stop 20 17 00 --- 15 05 02 30.6 284.1 4.6 67.8 193 978 20 13 31 20 19 30 1013+2449 15 07 32 26.3 284.3 4.9 66.0 133 978 20 19 30 20 21 00 --- 15 09 02 26.0 284.4 4.9 65.9 90 989 20 19 31 20 21 00 J1029A 15 09 02 29.8 284.5 4.6 67.6 -17 989 No stop 20 24 30 --- 15 12 33 29.0 284.8 4.7 67.4 193 1016 20 21 01 20 25 00 1013+2449 15 13 03 25.1 284.8 5.0 65.7 13 1016 20 25 00 20 26 30 --- 15 14 33 24.8 285.0 5.0 65.6 90 1028 20 25 01 20 26 30 J1029A 15 14 33 28.6 285.0 4.7 67.2 -17 1028 No stop 20 30 00 --- 15 18 04 27.9 285.4 4.8 67.0 193 1055 20 26 31 20 32 30 1013+2449 15 20 34 23.6 285.6 5.1 65.2 133 1055 20 32 30 20 34 00 --- 15 22 05 23.3 285.8 5.1 65.1 90 1067 20 32 31 20 34 00 J1029B 15 22 05 27.1 285.8 4.9 66.8 -17 1067 No stop 20 37 30 --- 15 25 35 26.3 286.1 4.9 66.5 193 1094 20 34 01 20 38 00 1013+2449 15 26 05 22.4 286.2 5.2 64.8 13 1094 20 38 00 20 39 30 --- 15 27 35 22.1 286.3 5.2 64.7 90 1105 20 38 01 20 39 30 J1029B 15 27 35 25.9 286.3 4.9 66.4 -17 1105 No stop 20 43 00 --- 15 31 06 25.2 286.7 5.0 66.2 193 1132 20 39 31 20 45 30 1013+2449 15 33 36 20.9 287.0 5.3 64.3 133 1132 20 45 30 20 47 00 --- 15 35 07 20.6 287.1 5.3 64.2 90 1144 20 45 31 20 47 00 J1029B 15 35 07 24.4 287.1 5.1 65.9 -17 1144 No stop 20 50 30 --- 15 38 37 23.7 287.5 5.1 65.6 193 1171 20 47 01 20 51 00 1013+2449 15 39 07 19.8 287.6 5.4 64.0 13 1171 20 51 00 20 52 30 --- 15 40 38 19.5 287.7 5.4 63.9 90 1183 20 51 01 Schedule for TIANMA65 (Code T6 ) Page 6 VLBI observations of a unique strong lensing cluster to test H0 tension 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 ---------------------------------------------------------------------------------------- --- Sun 2 Mar 2025 Day 61 --- 20 52 30 J1029B 15 40 38 23.3 287.7 5.2 65.5 -17 1183 No stop 20 56 00 --- 15 44 08 22.5 288.0 5.2 65.2 193 1210 20 52 31 20 58 30 1013+2449 15 46 39 18.2 288.4 5.5 63.5 133 1210 20 58 30 21 00 00 --- 15 48 09 17.9 288.5 5.5 63.3 90 1221 20 58 31 21 00 00 G2 15 48 09 21.7 288.4 5.3 65.0 -17 1221 No stop 21 03 30 --- 15 51 39 21.0 288.8 5.4 64.7 193 1248 21 00 01 21 04 00 1013+2449 15 52 10 17.1 289.0 5.6 63.1 13 1248 21 04 00 21 05 30 --- 15 53 40 16.8 289.1 5.6 62.9 90 1260 21 04 01 21 05 30 G2 15 53 40 20.6 289.0 5.4 64.5 -17 1260 No stop 21 09 00 --- 15 57 10 19.9 289.3 5.4 64.3 193 1287 21 05 31 21 11 30 1013+2449 15 59 41 15.6 289.8 5.7 62.5 133 1287 21 11 30 21 13 00 --- 16 01 11 15.3 289.9 5.8 62.4 90 1298 21 11 31 21 15 30 4C39.25 16 03 41 12.9 307.9 6.6 60.3 112 1298 21 15 30 21 21 30 --- 16 09 42 11.9 308.5 6.7 59.4 360 1345 21 15 31 21 24 00 1013+2449 16 12 13 13.1 291.1 5.9 61.5 113 1345 21 24 00 21 25 30 --- 16 13 43 12.8 291.3 6.0 61.4 90 1356 21 24 01 21 25 30 J1029A 16 13 43 16.6 291.1 5.7 63.0 -17 1356 No stop 21 29 00 --- 16 17 14 15.9 291.4 5.8 62.7 193 1384 21 25 31 21 29 30 1013+2449 16 17 44 12.0 291.8 6.0 61.1 13 1384 21 29 30 21 31 00 --- 16 19 14 11.7 291.9 6.1 61.0 90 1395 21 29 31 21 31 00 J1029A 16 19 14 15.5 291.7 5.8 62.6 -17 1395 No stop 21 34 30 --- 16 22 45 14.8 292.0 5.9 62.3 193 1422 21 31 01 21 37 00 1013+2449 16 25 15 10.5 292.6 6.2 60.5 133 1422 21 37 00 21 38 30 --- 16 26 45 10.2 292.8 6.2 60.3 90 1434 21 37 01 21 38 30 J1029B 16 26 45 14.0 292.5 5.9 61.9 -17 1434 No stop 21 42 00 --- 16 30 16 13.3 292.9 6.0 61.6 193 1461 21 38 31 21 42 30 1013+2449 16 30 46 9.4 293.2 6.3 60.0 13 1461 21 42 30 21 44 00 --- 16 32 16 9.1 293.4 6.3 59.9 90 1472 21 42 31 21 44 00 J1029B 16 32 16 12.9 293.1 6.0 61.5 -17 1472 No stop 21 47 30 --- 16 35 47 12.2 293.5 6.1 61.2 193 1499 21 44 01 Schedule for TIANMA65 (Code T6 ) Page 7 VLBI observations of a unique strong lensing cluster to test H0 tension 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 ---------------------------------------------------------------------------------------- --- Sun 2 Mar 2025 Day 61 --- 21 50 00 1013+2449 16 38 17 7.9 294.1 6.4 59.3 133 1499 21 50 00 21 51 30 --- 16 39 47 7.6 294.3 6.4 59.2 90 1511 21 50 01 21 51 30 J1029A 16 39 47 11.4 293.9 6.2 60.8 -17 1511 No stop 21 55 00 --- 16 43 18 10.7 294.3 6.2 60.5 193 1538 21 51 31 21 57 00 J1029A 16 45 18 10.3 294.5 6.2 60.3 118 1538 21 57 00 22 00 30 --- 16 48 49 9.7 294.9 6.3 60.0 210 1565 21 57 01 22 02 30 J1029B 16 50 49 9.3 295.2 6.3 59.8 118 1565 22 02 30 22 06 00 --- 16 54 20 8.6 295.6 6.4 59.5 210 1592 22 02 31 22 08 00 J1029B 16 56 20 8.2 295.8 6.4 59.3 118 1592 22 08 00 22 11 30 --- 16 59 51 7.5 296.2 6.5 59.0 210 1619 22 08 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess125.L1024 --- 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: TIANMA65 Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 2270.00 2270.00 2270.00 2270.00 2270.00 2270.00 2270.00 2270.00 Net SB= L L U U L L U U IF SB = L L L L L L L L Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 5 1 5 2 6 2 6 BBC SB= U U L L U U L L IF = A4 B3 A4 B3 A4 B3 A4 B3 The following frequency sets based on these setups were used. Frequency Set: 6 Setup file default. Used with PCAL = off LO sum= 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 BBC fr= 643.51 643.51 643.51 643.51 579.51 579.51 579.51 579.51 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 6 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * J1029A 10 26 27.153582 * 10 29 13.950000 10 30 39.504569 0.00 26 38 40.00512 * 26 23 17.96000 26 15 28.63961 0.00 From catalog imbedded in main SCHED input file. * J1029B 10 26 27.450733 * 10 29 14.250000 10 30 39.806118 0.00 26 39 02.21361 * 26 23 40.16000 26 15 50.83545 0.00 From catalog imbedded in main SCHED input file. * G2 10 26 25.768147 * 10 29 12.570000 10 30 38.127355 0.00 26 38 54.84567 * 26 23 32.84000 26 15 43.54104 0.00 From catalog imbedded in main SCHED input file. * 1013+2449 10 11 05.630348 * 10 13 53.428772 10 15 19.442770 0.00 25 04 10.18129 * 24 49 16.44079 24 41 42.10513 0.00 From catalog imbedded in main SCHED input file. * 4C39.25 09 23 55.319213 * 09 27 03.013934 09 28 39.233080 0.00 39 15 23.56646 * 39 02 20.85186 38 55 46.81814 0.00 From catalog imbedded in main SCHED input file. 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 J1029A sess125.L1024 1 2 3 4 5 6 7 8 9 10 2.567 160.480 J1029B sess125.L1024 1 2 3 4 5 6 7 8 9 10 2.567 158.216 G2 sess125.L1024 1 2 3 4 5 6 7 8 9 10 1.017 61.571 1013+2449 sess125.L1024 1 2 3 4 5 6 7 8 9 10 2.758 180.098 4C39.25 sess125.L1024 1 2 3 4 5 6 7 8 9 10 0.300 27.300 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) J1029A 159.6 J1029B 159.6 G2 159.6 1013+2449 159.6 4C39.25 142.3 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