COVER INFORMATION Station: HART (Code Hh ) Experiment: EVN 5 GHz and 22 GHz study of 43 compact radio sources Exp. Code: EC071M Schedule Version: 3.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Carolina Casadio Address: FORTH - Institute of Astrophysics Voutes, 7110 - Heraklion Crete (GR) Phone: (+30) 2810 39-4266 EMAIL: ccasadio@ia.forth.gr Fax: Phone during observation: Observing mode: Continuum Notes: Schedule for HART (Code Hh ) Page 2 EVN 5 GHz and 22 GHz study of 43 compact radio sources 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: 230.49 230.49 230.49 230.49 294.49 294.49 294.49 294.49 358.49 358.49 358.49 358.49 422.49 422.49 422.49 422.49 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 04 00 00 J2253+1608 23 13 34 47.6 353.4 0.3 0.0 0 0 04 00 00 04 03 00 --- 23 16 35 47.5 352.3 0.4 0.0 180 46 04 00 01 04 04 00 J2223+0838 23 17 35 53.0 337.8 0.9 0.0 17 46 04 04 00 04 05 30 --- 23 19 05 52.9 337.2 0.9 0.0 90 70 04 04 01 04 05 30 J2225+0841 23 19 05 53.0 338.2 0.9 0.0 -26 70 No stop 04 09 00 --- 23 22 36 52.7 336.8 0.9 0.0 184 124 04 05 31 04 09 30 J2223+0838 23 23 06 52.5 335.7 1.0 0.0 4 124 04 09 30 04 10 30 --- 23 24 06 52.4 335.3 1.0 0.0 60 139 04 09 31 04 10 30 J2225+0841 23 24 06 52.6 336.2 1.0 0.0 -26 139 No stop 04 14 00 --- 23 27 37 52.3 334.9 1.0 0.0 184 193 04 10 31 04 14 00 J2223+0838 23 27 37 52.1 334.0 1.1 0.0 -26 193 No stop 04 15 30 --- 23 29 07 52.0 333.5 1.1 0.0 64 216 04 14 01 04 15 30 J2225+0841 23 29 07 52.1 334.4 1.0 0.0 -26 216 No stop 04 19 00 --- 23 32 38 51.8 333.1 1.1 0.0 184 271 04 15 31 04 19 30 J2223+0838 23 33 08 51.5 332.0 1.1 0.0 4 271 04 19 30 04 20 30 --- 23 34 08 51.4 331.6 1.2 0.0 60 286 04 19 31 04 20 30 J2225+0841 23 34 08 51.6 332.5 1.1 0.0 -26 286 No stop 04 24 00 --- 23 37 38 51.3 331.3 1.2 0.0 184 340 04 20 31 04 24 00 J2223+0838 23 37 38 51.0 330.4 1.2 0.0 -26 340 No stop 04 25 30 --- 23 39 09 50.9 329.9 1.2 0.0 64 363 04 24 01 04 25 30 J2225+0841 23 39 09 51.1 330.7 1.2 0.0 -26 363 No stop 04 29 00 --- 23 42 39 50.7 329.5 1.3 0.0 184 417 04 25 31 04 29 30 J2223+0838 23 43 09 50.4 328.5 1.3 0.0 4 417 04 29 30 04 30 30 --- 23 44 09 50.3 328.2 1.3 0.0 60 433 04 29 31 04 30 30 J2225+0841 23 44 09 50.5 329.0 1.3 0.0 -26 433 No stop 04 34 00 --- 23 47 40 50.1 327.8 1.3 0.0 184 487 04 30 31 Schedule for HART (Code Hh ) Page 3 EVN 5 GHz and 22 GHz study of 43 compact radio sources 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 --- 04 34 00 J2223+0838 23 47 40 49.9 327.0 1.4 0.0 -26 487 No stop 04 35 30 --- 23 49 10 49.7 326.5 1.4 0.0 64 510 04 34 01 04 38 00 J0226+0937 23 51 41 38.0 51.8 -2.6 0.0 3 510 04 38 00 04 41 20 --- 23 55 01 38.6 51.1 -2.5 0.0 200 562 04 38 01 04 41 20 J0222+0952 23 55 01 39.1 50.0 -2.5 0.0 -28 562 No stop 04 44 50 --- 23 58 32 39.7 49.2 -2.4 0.0 182 616 04 41 21 04 45 20 J0226+0937 23 59 02 39.3 50.2 -2.5 0.0 3 616 04 45 20 04 46 20 --- 00 00 02 39.5 50.0 -2.5 0.0 60 631 04 45 21 04 46 20 J0222+0952 00 00 02 40.0 48.8 -2.4 0.0 -28 631 No stop 04 49 50 --- 00 03 33 40.6 48.0 -2.3 0.0 182 685 04 46 21 04 49 50 J0226+0937 00 03 33 40.1 49.2 -2.4 0.0 -27 685 No stop 04 51 20 --- 00 05 03 40.4 48.8 -2.4 0.0 63 709 04 49 51 04 51 20 J0222+0952 00 05 03 40.8 47.6 -2.3 0.0 -28 709 No stop 04 54 50 --- 00 08 33 41.4 46.8 -2.2 0.0 182 763 04 51 21 04 55 20 J0226+0937 00 09 03 41.0 47.9 -2.3 0.0 3 763 04 55 20 04 56 20 --- 00 10 04 41.2 47.6 -2.3 0.0 60 778 04 55 21 04 56 20 J0222+0952 00 10 04 41.7 46.4 -2.2 0.0 -28 778 No stop 04 59 50 --- 00 13 34 42.2 45.5 -2.2 0.0 182 832 04 56 21 04 59 50 J0226+0937 00 13 34 41.8 46.8 -2.2 0.0 -27 832 No stop 05 01 20 --- 00 15 04 42.0 46.4 -2.2 0.0 63 855 04 59 51 05 01 20 J0222+0952 00 15 04 42.5 45.2 -2.1 0.0 -28 855 No stop 05 04 50 --- 00 18 35 43.0 44.3 -2.1 0.0 182 909 05 01 21 05 05 20 J0226+0937 00 19 05 42.7 45.4 -2.1 0.0 3 909 05 05 20 05 06 20 --- 00 20 05 42.8 45.1 -2.1 0.0 60 925 05 05 21 05 06 20 J0222+0952 00 20 05 43.3 43.9 -2.1 0.0 -28 925 No stop 05 09 50 --- 00 23 36 43.8 42.9 -2.0 0.0 182 979 05 06 21 05 09 50 J0226+0937 00 23 36 43.4 44.2 -2.1 0.0 -27 979 No stop 05 11 20 --- 00 25 06 43.6 43.8 -2.0 0.0 63 1002 05 09 51 05 15 50 J2255+4202 00 29 37 18.6 342.0 1.6 0.0 137 1002 05 15 50 05 18 50 --- 00 32 37 18.4 341.5 1.6 0.0 180 1049 05 15 51 Schedule for HART (Code Hh ) Page 4 EVN 5 GHz and 22 GHz study of 43 compact radio sources 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 --- 05 18 50 J2259+4037 00 32 37 20.0 341.5 1.5 0.0 -29 1049 No stop 05 22 40 --- 00 36 28 19.7 340.8 1.6 0.0 201 1108 05 18 51 05 23 20 J2255+4202 00 37 08 18.1 340.7 1.7 0.0 11 1108 05 23 20 05 24 20 --- 00 38 08 18.0 340.5 1.7 0.0 60 1123 05 23 21 05 24 20 J2259+4037 00 38 08 19.6 340.5 1.6 0.0 -29 1123 No stop 05 28 10 --- 00 41 59 19.3 339.8 1.7 0.0 201 1183 05 24 21 05 28 10 J2255+4202 00 41 59 17.7 339.8 1.8 0.0 -29 1183 No stop 05 30 00 --- 00 43 49 17.6 339.5 1.8 0.0 81 1211 05 28 11 05 30 00 J2259+4037 00 43 49 19.1 339.5 1.7 0.0 -29 1211 No stop 05 33 50 --- 00 47 40 18.8 338.8 1.8 0.0 201 1270 05 30 01 05 34 30 J2255+4202 00 48 20 17.2 338.7 1.9 0.0 11 1270 05 34 30 05 35 30 --- 00 49 20 17.1 338.5 1.9 0.0 60 1286 05 34 31 05 35 30 J2259+4037 00 49 20 18.7 338.5 1.8 0.0 -29 1286 No stop 05 39 20 --- 00 53 11 18.4 337.8 1.9 0.0 201 1345 05 35 31 05 39 20 J2255+4202 00 53 11 16.8 337.8 1.9 0.0 -29 1345 No stop 05 41 10 --- 00 55 01 16.7 337.5 2.0 0.0 81 1373 05 39 21 05 41 10 J2259+4037 00 55 01 18.2 337.4 1.9 0.0 -29 1373 No stop 05 45 00 --- 00 58 52 17.9 336.8 2.0 0.0 201 1432 05 41 11 05 45 40 J2255+4202 00 59 32 16.3 336.8 2.0 0.0 11 1432 05 45 40 05 46 40 --- 01 00 32 16.2 336.6 2.1 0.0 60 1448 05 45 41 05 46 40 J2259+4037 01 00 32 17.7 336.5 2.0 0.0 -29 1448 No stop 05 50 30 --- 01 04 23 17.4 335.8 2.1 0.0 201 1507 05 46 41 05 50 30 J2255+4202 01 04 23 15.8 335.9 2.1 0.0 -29 1507 No stop 05 52 20 --- 01 06 13 15.7 335.6 2.2 0.0 81 1536 05 50 31 05 55 50 J2327-0041 01 09 43 54.8 312.0 1.7 0.0 97 1536 05 55 50 05 58 50 --- 01 12 44 54.3 311.0 1.7 0.0 180 1582 05 55 51 05 58 50 J2324-0058 01 12 44 54.0 309.7 1.8 0.0 -27 1582 No stop 06 02 20 --- 01 16 14 53.4 308.7 1.9 0.0 183 1636 05 58 51 06 02 50 J2327-0041 01 16 45 53.6 309.8 1.8 0.0 4 1636 06 02 50 06 03 50 --- 01 17 45 53.4 309.5 1.8 0.0 60 1651 06 02 51 Schedule for HART (Code Hh ) Page 5 EVN 5 GHz and 22 GHz study of 43 compact radio sources 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 --- 06 03 50 J2324-0058 01 17 45 53.1 308.2 1.9 0.0 -27 1651 No stop 06 07 20 --- 01 21 15 52.5 307.2 1.9 0.0 183 1706 06 03 51 06 07 20 J2327-0041 01 21 15 52.8 308.4 1.9 0.0 -26 1706 No stop 06 08 50 --- 01 22 46 52.6 308.0 1.9 0.0 64 1729 06 07 21 06 08 50 J2324-0058 01 22 46 52.2 306.8 2.0 0.0 -27 1729 No stop 06 12 20 --- 01 26 16 51.6 305.8 2.0 0.0 183 1783 06 08 51 06 12 50 J2327-0041 01 26 46 51.9 306.8 2.0 0.0 4 1783 06 12 50 06 13 50 --- 01 27 46 51.7 306.6 2.0 0.0 60 1798 06 12 51 06 13 50 J2324-0058 01 27 46 51.3 305.4 2.0 0.0 -27 1798 No stop 06 17 20 --- 01 31 17 50.7 304.4 2.1 0.0 183 1852 06 13 51 06 17 20 J2327-0041 01 31 17 51.0 305.6 2.1 0.0 -26 1852 No stop 06 18 50 --- 01 32 47 50.8 305.2 2.1 0.0 64 1876 06 17 21 06 18 50 J2324-0058 01 32 47 50.4 304.0 2.1 0.0 -27 1876 No stop 06 22 20 --- 01 36 18 49.7 303.1 2.2 0.0 183 1930 06 18 51 06 22 20 J2327-0041 01 36 18 50.1 304.3 2.1 0.0 -26 1930 No stop 06 23 50 --- 01 37 48 49.8 303.9 2.2 0.0 64 1953 06 22 21 06 24 20 J2328-0634 01 38 18 53.7 296.7 2.1 0.0 -9 1953 06 24 20 06 26 20 --- 01 40 18 53.3 296.2 2.2 0.0 111 1984 06 24 21 06 26 20 J2337-0622 01 40 18 54.9 298.8 2.0 0.0 -31 1984 No stop 06 30 00 --- 01 43 59 54.2 297.8 2.1 0.0 189 2040 06 26 21 06 30 40 J2328-0634 01 44 39 52.4 295.2 2.2 0.0 9 2040 06 30 40 06 31 40 --- 01 45 39 52.2 295.0 2.3 0.0 60 2056 06 30 41 06 31 40 J2337-0622 01 45 39 53.9 297.4 2.1 0.0 -31 2056 No stop 06 35 20 --- 01 49 20 53.1 296.5 2.2 0.0 189 2113 06 31 41 06 35 20 J2328-0634 01 49 20 51.5 294.1 2.3 0.0 -31 2113 No stop 06 37 00 --- 01 51 00 51.1 293.8 2.4 0.0 69 2138 06 35 21 06 37 00 J2337-0622 01 51 00 52.8 296.1 2.2 0.0 -31 2138 No stop 06 40 40 --- 01 54 41 52.1 295.2 2.3 0.0 189 2195 06 37 01 06 41 20 J2328-0634 01 55 21 50.2 292.8 2.4 0.0 9 2195 06 41 20 06 42 20 --- 01 56 21 50.0 292.6 2.4 0.0 60 2211 06 41 21 Schedule for HART (Code Hh ) Page 6 EVN 5 GHz and 22 GHz study of 43 compact radio sources 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 --- 06 42 20 J2337-0622 01 56 21 51.7 294.8 2.3 0.0 -31 2211 No stop 06 46 00 --- 02 00 02 51.0 294.0 2.4 0.0 189 2267 06 42 21 06 46 00 J2328-0634 02 00 02 49.3 291.8 2.5 0.0 -31 2267 No stop 06 47 40 --- 02 01 42 48.9 291.5 2.5 0.0 69 2293 06 46 01 06 47 40 J2337-0622 02 01 42 50.6 293.6 2.4 0.0 -31 2293 No stop 06 51 20 --- 02 05 23 49.9 292.8 2.4 0.0 189 2350 06 47 41 06 51 20 J2328-0634 02 05 23 48.1 290.7 2.6 0.0 -31 2350 No stop 06 53 00 --- 02 07 03 47.8 290.4 2.6 0.0 69 2375 06 51 21 06 57 00 J0237+2848 02 11 03 34.8 7.5 -0.5 0.0 119 2375 06 57 00 07 00 00 --- 02 14 04 34.9 6.7 -0.4 0.0 180 2422 06 57 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 Matching groups in /home/guest/rmc/SCHED/sched11.6/catalogs/freq_RDBE.dat: hh6cm Values confirmed by E-mail Jonathan Quick 20140219 (CR) ****** Only 256.00 of 512.00 MHz total bandwidth is within the IFs in the setup file before any FREQ or DOPPLER shifts. Setup group: 7 Station: HART 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= 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 4600.00 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: 12 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= 230.49 230.49 230.49 230.49 294.49 294.49 294.49 294.49 358.49 358.49 358.49 358.49 422.49 422.49 422.49 422.49 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: 12 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) * J2225+0841 22 23 13.778443 * 22 25 43.480208 22 26 47.019656 0.00 08 26 40.84989 * 08 41 57.17632 08 48 20.29212 0.00 From catalog imbedded in main SCHED input file. * J2259+4037 22 56 45.590776 * 22 59 04.102658 23 00 02.785465 0.00 40 21 41.93952 * 40 37 47.34798 40 44 21.30491 0.00 From catalog imbedded in main SCHED input file. * J0222+0952 02 19 35.220659 * 02 22 15.608416 02 23 22.455089 0.00 09 38 59.26872 * 09 52 37.82044 09 58 19.23842 0.00 From catalog imbedded in main SCHED input file. * J2324-0058 23 21 30.636145 * 23 24 04.620465 23 25 09.642079 0.00 -01 15 23.15620 *-00 58 54.16633 -00 51 57.28300 0.00 From catalog imbedded in main SCHED input file. * J2337-0622 23 34 54.666101 * 23 37 29.228401 23 38 34.415617 0.00 -06 38 48.97876 *-06 22 12.18085 -06 15 10.16671 0.00 From catalog imbedded in main SCHED input file. * J2223+0838 22 20 51.382478 * 22 23 21.014100 22 24 24.536602 0.00 08 23 42.06425 * 08 38 54.14000 08 45 15.49226 0.00 From catalog imbedded in main SCHED input file. * J2255+4202 22 53 19.843648 * 22 55 36.707800 22 56 34.721219 0.00 41 46 51.26638 * 42 02 52.53300 42 09 24.41493 0.00 From catalog imbedded in main SCHED input file. * J0226+0937 02 23 33.344806 * 02 26 13.715400 02 27 20.539005 0.00 09 23 58.33726 * 09 37 26.75800 09 43 03.98608 0.00 From catalog imbedded in main SCHED input file. * J2327-0041 23 24 36.781294 * 23 27 10.699100 23 28 15.676106 0.00 -00 58 28.80393 *-00 41 57.71400 -00 35 00.05406 0.00 From catalog imbedded in main SCHED input file. * J2328-0634 23 26 04.324762 * 23 28 39.213700 23 29 44.586611 0.00 -06 51 00.11643 *-06 34 28.06300 -06 27 27.94420 0.00 From catalog imbedded in main SCHED input file. * J2253+1608 22 51 29.519701 * 22 53 57.747900 22 55 00.521557 0.00 15 52 54.34817 * 16 08 53.56100 16 15 32.13948 0.00 From catalog imbedded in main SCHED input file. * J0237+2848 02 34 55.589613 * 02 37 52.405700 02 39 06.044156 0.00 28 35 11.40775 * 28 48 08.99000 28 53 28.99756 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 J2225+0841 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 0.350 25.097 J2259+4037 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 0.383 28.666 J0222+0952 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 15 0.350 33.668 J2324-0058 sess221.C2048 1 2 3 4 5 6 8 9 12 13 0.292 17.544 J2337-0622 sess221.C2048 1 2 3 4 5 6 8 9 12 13 0.306 18.012 J2223+0838 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 0.150 9.850 J2255+4202 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 0.192 13.200 J0226+0937 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 15 0.181 15.524 J2327-0041 sess221.C2048 1 2 3 4 5 6 8 9 12 13 0.158 7.974 J2328-0634 sess221.C2048 1 2 3 4 5 6 8 9 12 13 0.150 8.063 J2253+1608 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 0.050 4.550 J0237+2848 sess221.C2048 1 2 3 4 5 6 7 8 9 12 13 15 0.050 4.984 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) J2225+0841 99.2 J2259+4037 79.2 J0222+0952 44.8 J2324-0058 89.8 J2337-0622 88.9 J2223+0838 99.8 J2255+4202 79.3 J0226+0937 44.0 J2327-0041 89.0 J2328-0634 91.0 J2253+1608 89.8 J0237+2848 37.1 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