COVER INFORMATION Station: TIANMA65 (Code T6 ) Experiment: RadioAstron polarization imaging Exp. Code: gg083d Schedule Version: 1.20 Processed by SCHED version: 11.40 Release 11.4. March 14, 2015 PI: Jose L. Gomez Address: Instituto de Astrofisica de Andalucia-CSIC Glorieta de la Astronomia E-18008 Granada, Spain Phone: +79165452842 EMAIL: jlgomez@iaa.es, alobanov@mpifr-bonn.mpg.de Fax: Phone during observation: +79165452842 Observing mode: K-band dual-pol Notes: K-band, Radioastron-compatible frequency setup P-CAL is ON Tsys is ON auto-level (AGC) is ON Schedule for TIANMA65 (Code T6 ) Page 2 RadioAstron polarization imaging 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 8 Feb 2018 Day 39 --- Next scan frequencies: 22236.00 22236.00 22236.00 22236.00 22268.00 22268.00 22268.00 22268.00 Next BBC frequencies: 656.00 656.00 656.00 656.00 688.00 688.00 688.00 688.00 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 22 00 00 1226+023 15 20 22 40.4 242.6 2.8 49.5 0 0 21 59 49 22 07 30 --- 15 27 54 38.9 244.1 3.0 50.5 450 30 21 59 50 ---------- K-band VLBI scans. Space segment 01: 1226+023 with EVN ---------- 22 08 00 1226+023 15 28 24 38.8 244.3 3.0 50.5 28 30 22 07 49 22 18 00 --- 15 38 25 36.9 246.2 3.1 51.7 600 69 22 07 50 22 18 30 1226+023 15 38 55 36.8 246.3 3.1 51.7 28 69 22 18 19 22 28 00 --- 15 48 27 34.9 248.1 3.3 52.7 570 106 22 18 20 22 28 30 1226+023 15 48 57 34.8 248.2 3.3 52.7 28 106 22 28 19 22 38 00 --- 15 58 29 32.9 250.0 3.5 53.6 570 143 22 28 20 ---------- KVN observing target during EVN EVPA + FF calibration ---------- 22 38 30 1226+023 15 58 59 32.8 250.0 3.5 53.6 28 143 22 38 19 22 50 30 --- 16 11 01 30.4 252.1 3.7 54.6 720 190 22 38 20 22 51 30 1226+023 16 12 01 30.2 252.3 3.7 54.7 58 190 22 51 19 23 04 00 --- 16 24 33 27.6 254.3 3.9 55.6 750 239 22 51 20 ---------- K-band target ---------- 23 04 30 1226+023 16 25 03 27.5 254.4 3.9 55.6 28 239 23 04 19 23 14 30 --- 16 35 05 25.4 256.0 4.1 56.2 600 278 23 04 20 ---------- K-band target ---------- 23 14 30 1226+023 16 35 05 25.4 256.0 4.1 56.2 -2 278 No stop 23 24 30 --- 16 45 06 23.3 257.5 4.3 56.8 598 316 23 14 31 ---------- K-band target ---------- 23 24 30 1226+023 16 45 06 23.3 257.5 4.3 56.8 -2 316 No stop 23 34 30 --- 16 55 08 21.2 259.0 4.4 57.2 598 355 23 24 31 ---------- K-band target ---------- 23 34 30 1226+023 16 55 08 21.2 259.0 4.4 57.2 -2 355 No stop 23 44 30 --- 17 05 10 19.1 260.4 4.6 57.7 598 393 23 34 31 Schedule for TIANMA65 (Code T6 ) Page 3 RadioAstron polarization imaging 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 8 Feb 2018 Day 39 --- 23 46 30 1226+023 17 07 10 18.7 260.7 4.6 57.7 118 393 23 46 19 23 54 30 --- 17 15 11 17.0 261.8 4.8 58.0 480 425 23 46 20 --- Start: Thu 8 Feb 2018 Day 39 -- Stop: Fri 9 Feb 2018 Day 40 --- 23 55 00 1226+023 17 15 41 16.9 261.9 4.8 58.0 28 425 23 54 49 00 14 30 --- 17 35 15 12.7 264.5 5.1 58.5 1170 501 23 54 50 ---------- K-band VLBI scans. Space segment 02: 1226+023 with EVN ---------- 00 15 00 1226+023 17 35 45 12.6 264.6 5.1 58.5 28 501 00 14 49 00 25 00 --- 17 45 46 10.5 265.9 5.3 58.7 600 540 00 14 50 00 25 30 1226+023 17 46 16 10.4 266.0 5.3 58.7 28 540 00 25 19 00 35 00 --- 17 55 48 8.3 267.2 5.4 58.9 570 577 00 25 20 13 44 30 0923+392 07 07 28 60.3 424.9 -2.3 -94.5 47258 577 13 44 19 13 49 30 --- 07 12 28 61.3 424.7 -2.3 -95.4 300 597 13 44 20 ---------- VLA back ---------- 13 54 30 1226+023 07 17 29 11.2 94.5 -5.2 W -58.7 -361 597 13 54 19 13 55 30 --- 07 18 29 11.4 94.6 -5.2 W -58.7 0 601 13 54 20 13 55 40 1226+023 07 18 39 11.4 94.7 -5.2 -58.7 8 601 No stop 14 04 30 --- 07 27 31 13.3 95.8 -5.0 -58.5 530 636 13 55 31 14 05 00 1226+023 07 28 01 13.4 95.9 -5.0 -58.5 28 636 14 04 49 14 06 00 --- 07 29 01 13.6 96.0 -5.0 -58.4 60 641 14 04 50 14 06 10 1226+023 07 29 11 13.7 96.1 -5.0 -58.4 8 641 No stop 14 14 00 --- 07 37 02 15.3 97.1 -4.9 -58.2 470 671 14 06 01 14 14 30 1226+023 07 37 32 15.4 97.2 -4.9 -58.2 28 671 14 14 19 14 15 30 --- 07 38 33 15.6 97.3 -4.9 -58.2 60 676 14 14 20 14 15 40 1226+023 07 38 43 15.7 97.4 -4.9 -58.2 8 676 No stop 14 23 30 --- 07 46 34 17.3 98.4 -4.7 -57.9 470 707 14 15 31 ---------- All back to K-band ---------- 14 35 30 1226+023 07 58 36 19.9 100.1 -4.5 -57.5 718 707 14 35 19 14 36 30 --- 07 59 36 20.1 100.3 -4.5 -57.5 60 711 14 35 20 Schedule for TIANMA65 (Code T6 ) Page 4 RadioAstron polarization imaging 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 ---------------------------------------------------------------------------------------- --- Fri 9 Feb 2018 Day 40 --- 14 36 40 1226+023 07 59 46 20.1 100.3 -4.5 -57.5 8 711 No stop 14 45 00 --- 08 08 08 21.9 101.5 -4.4 -57.1 500 744 14 36 31 14 45 30 1226+023 08 08 38 22.0 101.6 -4.4 -57.1 28 744 14 45 19 14 46 30 --- 08 09 38 22.2 101.7 -4.3 -57.0 60 749 14 45 20 14 46 40 1226+023 08 09 48 22.2 101.7 -4.3 -57.0 8 749 No stop 14 53 30 --- 08 16 39 23.7 102.8 -4.2 -56.7 410 775 14 46 31 15 01 00 0923+392 08 24 10 74.7 54.6 -1.1 -116.2 247 775 15 00 49 15 06 00 --- 08 29 11 75.6 52.8 -1.0 -118.6 300 795 15 00 50 15 07 40 1226+023 08 30 51 26.6 104.9 -4.0 -55.9 -97 795 15 07 30 15 16 30 --- 08 39 43 28.5 106.4 -3.8 -55.3 433 830 15 07 31 15 17 00 1226+023 08 40 13 28.6 106.4 -3.8 -55.3 28 830 15 16 49 15 18 00 --- 08 41 13 28.8 106.6 -3.8 -55.2 60 835 15 16 50 15 18 10 1226+023 08 41 23 28.8 106.6 -3.8 -55.2 8 835 No stop 15 24 30 --- 08 47 44 30.1 107.7 -3.7 -54.7 380 860 15 18 01 ---------- K-band VLBI scans. Space segment 06: 1226+023 with LBA+VLA27+KVN+T6+Ur ---------- 15 25 00 1226+023 08 48 14 30.2 107.8 -3.7 -54.7 28 860 15 24 49 15 26 00 --- 08 49 14 30.4 107.9 -3.7 -54.6 60 864 15 24 50 15 26 10 1226+023 08 49 24 30.4 107.9 -3.7 -54.6 8 864 No stop 15 35 00 --- 08 58 16 32.2 109.5 -3.5 -53.9 530 899 15 26 01 15 35 30 1226+023 08 58 46 32.3 109.5 -3.5 -53.8 28 899 15 35 19 15 36 30 --- 08 59 46 32.5 109.7 -3.5 -53.8 60 903 15 35 20 15 36 40 1226+023 08 59 56 32.6 109.8 -3.5 -53.7 8 903 No stop 15 45 00 --- 09 08 17 34.2 111.2 -3.4 -53.0 500 936 15 36 31 15 45 30 1226+023 09 08 47 34.3 111.3 -3.4 -52.9 28 936 15 45 19 15 46 30 --- 09 09 48 34.5 111.5 -3.3 -52.9 60 941 15 45 20 15 46 40 1226+023 09 09 58 34.6 111.6 -3.3 -52.8 8 941 No stop 15 55 00 --- 09 18 19 36.2 113.1 -3.2 -52.0 500 973 15 46 31 15 55 30 1226+023 09 18 49 36.3 113.2 -3.2 -52.0 28 973 15 55 19 15 56 30 --- 09 19 49 36.5 113.4 -3.2 -51.8 60 978 15 55 20 Schedule for TIANMA65 (Code T6 ) Page 5 RadioAstron polarization imaging 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 ---------------------------------------------------------------------------------------- --- Fri 9 Feb 2018 Day 40 --- 15 56 40 1226+023 09 19 59 36.6 113.4 -3.2 -51.8 8 978 No stop 16 05 00 --- 09 28 21 38.2 115.1 -3.0 -50.9 500 1010 15 56 31 ---------- Q-band block on target ---------- 16 05 30 1226+023 09 28 51 38.3 115.2 -3.0 -50.8 28 1010 16 05 19 16 06 30 --- 09 29 51 38.5 115.4 -3.0 -50.7 60 1015 16 05 20 16 06 40 1226+023 09 30 01 38.5 115.4 -3.0 -50.7 8 1015 No stop 16 15 30 --- 09 38 52 40.2 117.2 -2.9 -49.6 530 1050 16 06 31 16 22 30 0923+392 09 45 54 81.3 -23.5 0.3 154.0 142 1050 16 22 19 16 27 30 --- 09 50 54 80.9 -29.0 0.4 147.7 300 1070 16 22 20 16 30 20 1226+023 09 53 45 43.0 120.5 -2.6 -47.6 -132 1070 16 30 10 16 39 10 --- 10 02 36 44.6 122.6 -2.5 -46.2 398 1104 16 30 11 16 39 40 1226+023 10 03 06 44.7 122.7 -2.4 -46.1 28 1104 16 39 29 16 40 40 --- 10 04 07 44.9 123.0 -2.4 -45.9 60 1109 16 39 30 16 40 50 1226+023 10 04 17 44.9 123.0 -2.4 -45.9 8 1109 No stop 16 49 10 --- 10 12 38 46.4 125.1 -2.3 -44.5 500 1141 16 40 41 16 49 40 1226+023 10 13 08 46.5 125.3 -2.3 -44.4 28 1141 16 49 29 16 50 40 --- 10 14 08 46.7 125.5 -2.3 -44.2 60 1146 16 49 30 16 50 50 1226+023 10 14 18 46.7 125.6 -2.3 -44.2 8 1146 No stop 16 57 30 --- 10 20 59 47.8 127.4 -2.2 -42.9 400 1172 16 50 41 ---------- rest on target ---------- 16 58 00 1226+023 10 21 29 47.9 127.5 -2.1 -42.8 28 1172 16 57 49 17 08 00 --- 10 31 31 49.6 130.3 -2.0 -40.8 600 1211 16 57 50 ---------- All back to target ---------- 17 08 30 1226+023 10 32 01 49.7 130.5 -2.0 -40.7 28 1211 17 08 19 17 09 30 --- 10 33 01 49.8 130.8 -2.0 -40.5 60 1216 17 08 20 17 09 40 1226+023 10 33 11 49.9 130.8 -1.9 -40.4 8 1216 No stop 17 18 30 --- 10 42 03 51.3 133.5 -1.8 -38.4 530 1251 17 09 31 17 19 00 1226+023 10 42 33 51.4 133.7 -1.8 -38.3 28 1251 17 18 49 17 20 00 --- 10 43 33 51.5 134.0 -1.8 -38.1 60 1255 17 18 50 Schedule for TIANMA65 (Code T6 ) Page 6 RadioAstron polarization imaging 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 ---------------------------------------------------------------------------------------- --- Fri 9 Feb 2018 Day 40 --- 17 20 10 1226+023 10 43 43 51.5 134.0 -1.8 -38.0 8 1255 No stop 17 28 30 --- 10 52 04 52.8 136.8 -1.6 -35.9 500 1288 17 20 01 17 29 00 1226+023 10 52 34 52.9 136.9 -1.6 -35.8 28 1288 17 28 49 17 30 00 --- 10 53 35 53.0 137.3 -1.6 -35.6 60 1292 17 28 50 17 30 10 1226+023 10 53 45 53.0 137.3 -1.6 -35.5 8 1292 No stop 17 38 30 --- 11 02 06 54.2 140.2 -1.5 -33.2 500 1325 17 30 01 ---------- Q-band block ---------- 17 39 00 1226+023 11 02 36 54.3 140.4 -1.5 -33.1 28 1325 17 38 49 17 40 00 --- 11 03 36 54.4 140.8 -1.4 -32.8 60 1330 17 38 50 17 40 10 1226+023 11 03 46 54.4 140.8 -1.4 -32.8 8 1330 No stop 17 49 00 --- 11 12 38 55.6 144.1 -1.3 -30.1 530 1364 17 40 01 17 56 00 0923+392 11 19 39 66.0 296.8 1.9 100.5 112 1364 17 55 49 18 01 00 --- 11 24 40 65.0 296.4 1.9 99.4 300 1384 17 55 50 18 02 10 1226+023 11 25 50 57.1 149.4 -1.1 -25.9 -223 1384 18 02 00 18 11 00 --- 11 34 41 58.1 153.1 -0.9 -22.8 307 1419 18 02 01 18 11 00 1226+023 11 34 41 58.1 153.1 -0.9 -22.8 -2 1419 No stop 18 12 00 --- 11 35 42 58.2 153.6 -0.9 -22.4 58 1423 18 11 01 18 12 10 1226+023 11 35 52 58.2 153.7 -0.9 -22.4 8 1423 No stop 18 19 10 --- 11 42 53 58.8 156.8 -0.8 -19.7 420 1450 18 12 01 ---------- K-band VLBI scans. Space segment 07: 1226+023 with LBA+KVN+T6+Ur ---------- 18 20 00 1226+023 11 43 43 58.9 157.2 -0.8 -19.4 48 1450 18 19 49 18 21 00 --- 11 44 43 59.0 157.6 -0.8 -19.0 60 1455 18 19 50 18 21 10 1226+023 11 44 53 59.0 157.7 -0.8 -19.0 8 1455 No stop 18 30 00 --- 11 53 44 59.6 161.8 -0.6 -15.5 530 1489 18 21 01 18 30 30 1226+023 11 54 15 59.7 162.1 -0.6 -15.3 28 1489 18 30 19 18 31 30 --- 11 55 15 59.7 162.6 -0.6 -14.9 60 1494 18 30 20 18 31 40 1226+023 11 55 25 59.7 162.6 -0.6 -14.8 8 1494 No stop 18 40 00 --- 12 03 46 60.2 166.7 -0.4 -11.4 500 1527 18 31 31 18 40 30 1226+023 12 04 16 60.2 166.9 -0.4 -11.2 28 1527 18 40 19 18 41 30 --- 12 05 16 60.3 167.4 -0.4 -10.7 60 1531 18 40 20 Schedule for TIANMA65 (Code T6 ) Page 7 RadioAstron polarization imaging 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 ---------------------------------------------------------------------------------------- --- Fri 9 Feb 2018 Day 40 --- 18 41 40 1226+023 12 05 26 60.3 167.5 -0.4 -10.7 8 1531 No stop 18 50 00 --- 12 13 48 60.6 171.7 -0.3 -7.1 500 1564 18 41 31 18 50 30 1226+023 12 14 18 60.6 172.0 -0.3 -6.9 28 1564 18 50 19 18 51 30 --- 12 15 18 60.7 172.5 -0.2 -6.4 60 1568 18 50 20 18 51 40 1226+023 12 15 28 60.7 172.6 -0.2 -6.4 8 1568 No stop 19 00 00 --- 12 23 49 60.8 176.8 -0.1 -2.7 500 1601 18 51 31 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: ra1cm2.set --- 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: 30 Station: TIANMA65 Total bit rate: 512 Format: MARK5B Bits per sample: 2 Sample rate: 32.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 21580.00 21580.00 21580.00 21580.00 21580.00 21580.00 21580.00 21580.00 Net SB= U U L L U U L L IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 BBC SB= U U L L U U L L IF = A2 C1 A2 C1 A2 C1 A2 C1 The following frequency sets based on these setups were used. Frequency Set: 12 Setup file default. Used with PCAL = off LO sum= 22236.00 22236.00 22236.00 22236.00 22268.00 22268.00 22268.00 22268.00 BBC fr= 656.00 656.00 656.00 656.00 688.00 688.00 688.00 688.00 Bandwd= 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Matching frequency sets: 12 Track assignments are: track1= 2, 6, 10, 14, 4, 8, 12, 16 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * FAKERA 11 57 21.769299 * 12 00 00.000000 12 01 00.483936 0.00 85 16 41.77889 * 85 00 00.00000 84 53 47.52470 0.00 From catalog imbedded in main SCHED input file. fake circumpolar target for a TS to look at 1328+307 13 28 49.657778 * 13 31 08.288070 13 31 58.208451 0.00 J1331+3030 30 45 58.64060 * 30 30 32.95924 30 24 50.67595 0.00 * 3C286 ./gg083d_sources.radioastron WSRT calibrator, not for 92cm, rfc_2013d Petrov, 2013, unpublished 542 observati * 0727-115 07 27 58.097813 * 07 30 19.112473 07 31 10.802612 0.00 J0730-1141 -11 34 52.58107 *-11 41 12.60063 -11 43 44.55700 0.00 ./gg083d_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 155894 observations, RA-AO3-04, RA-AO2- * 0923+392 09 23 55.319218 * 09 27 03.013939 09 28 11.366254 0.00 J0927+3902 39 15 23.56637 * 39 02 20.85177 38 57 28.85387 0.00 4C39.25 ./gg083d_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 245863 observations, RA-AO3-04, RA-AO3- * 1226+023 12 26 33.245835 * 12 29 06.699731 12 30 02.412902 0.00 J1229+0203 02 19 43.30547 * 02 03 08.59797 01 57 07.17814 0.00 3C273B ./gg083d_sources.radioastron 3C273 AGN, rfc_2013d Petrov, 2013, unpublished 32011 observations, RA-AO3-04, RA-AO3-0 1253-055 12 53 35.831289 * 12 56 11.166557 12 57 07.519618 0.00 J1256-0547 -05 31 07.99603 *-05 47 21.52489 -05 53 12.02711 0.00 * 3C279 ./gg083d_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 7924 observations, RA-AO3-04, RA-AO3-05 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 FAKERA ra1cm2.set 14 5.283 0.000 3C286 ra1cm2.set 53 0.500 0.000 ra2cm2.set 54 0.500 0.000 ra7mm2.set 52 0.500 0.000 0727-115 ra1cm2.set 56 57 58 59 60 1.686 16.383 0923+392 ra1cm2.set 1 2 3 4 5 6 7 9 12 13 29 47 + 1.583 49.745 ra2cm2.set 38 54 0.667 20.333 ra7mm2.set 15 16 19 20 52 1.483 32.239 1226+023 ra1cm2.set 1 2 3 4 5 6 7 9 12 13 29 47 + 20.494 1018.787 ra2cm2.set 38 51 54 0.883 38.200 ra7mm2.set 15 16 19 20 52 1.642 47.821 3C279 ra1cm2.set 56 57 58 59 60 0.164 1.590 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) FAKERA 108.7 3C286 123.0 0727-115 140.1 0923+392 155.6 1226+023 134.3 3C279 125.2 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