COVER INFORMATION Station: DEFFORD (Code De ) Experiment: ET048B Exp. Code: ET048B Schedule Version: 2.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Oleg Titov Address: Geoscience Australia Cnr Jerrabomberra Avenue and Hindmarsh Drive Symonston ACT 2609 GPO Box 378 Canberra ACT 2601 Australia Phone: +61 2 6249 9064 EMAIL: Oleg.Titov@ga.gov.au Fax: Phone during observation: +61 2 6249 9064 Observing mode: Notes: Imaging extragalactic radio sources with extremely large radio-optical offsets Devided on 3 epochs: ET048A, ET048B, ET048C 6cm, 1024 Mbps, RCP & LCP, 2 bit sampling Prepared by Alexey Melnikov, aem@iaaras.ru Schedule for DEFFORD (Code De ) Page 2 ET048B 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 10 Mar 2022 Day 69 --- Next scan frequencies: 4958.49 4958.49 Next BBC frequencies: 705.51 705.51 Next scan bandwidths: 64.00 64.00 09 30 00 J0205+3212 20 33 36 28.9 73.5 -5.5 -44.2 0 0 09 30 00 09 38 00 =0202+319 20 41 37 30.1 74.9 -5.4 -44.6 480 31 09 30 01 09 39 00 J0112+3208 20 42 37 38.1 84.4 -4.5 -46.3 8 31 09 39 00 09 44 00 =0110+318 20 47 38 38.9 85.4 -4.4 -46.4 300 50 09 39 01 09 44 00 J0112+3208 20 47 38 38.9 85.4 -4.4 -46.4 -2 50 No stop 09 45 30 =0110+318 20 49 08 39.1 85.7 -4.4 -46.4 88 56 09 44 01 09 45 30 0116+319 20 49 08 38.1 84.4 -4.5 -46.3 -20 56 No stop 09 49 00 --- 20 52 39 38.6 85.0 -4.5 -46.4 190 70 09 45 31 09 49 00 J0112+3208 20 52 39 39.6 86.3 -4.4 -46.5 -20 70 No stop 09 50 30 =0110+318 20 54 09 39.9 86.6 -4.3 -46.5 70 75 09 49 01 09 50 30 0116+319 20 54 09 38.9 85.3 -4.4 -46.4 -20 75 No stop 09 54 00 --- 20 57 40 39.4 86.0 -4.4 -46.5 190 89 09 50 31 09 54 40 J0112+3208 20 58 20 40.5 87.4 -4.3 -46.5 19 89 09 54 40 09 56 10 =0110+318 20 59 50 40.7 87.7 -4.2 -46.5 90 95 09 54 41 09 56 10 0116+319 20 59 50 39.7 86.4 -4.3 -46.5 -20 95 No stop 09 59 40 --- 21 03 21 40.3 87.0 -4.3 -46.5 190 108 09 56 11 09 59 40 J0112+3208 21 03 21 41.3 88.4 -4.2 -46.6 -21 108 No stop 10 01 10 =0110+318 21 04 51 41.5 88.7 -4.2 -46.6 69 114 09 59 41 10 01 10 0116+319 21 04 51 40.5 87.3 -4.3 -46.5 -20 114 No stop 10 04 40 --- 21 08 22 41.0 88.0 -4.2 -46.6 190 128 10 01 11 10 05 20 J0112+3208 21 09 02 42.1 89.5 -4.1 -46.6 19 128 10 05 20 10 06 50 =0110+318 21 10 32 42.4 89.8 -4.1 -46.6 90 133 10 05 21 10 06 50 0116+319 21 10 32 41.4 88.4 -4.2 -46.6 -20 133 No stop 10 10 20 --- 21 14 03 41.9 89.1 -4.1 -46.6 190 147 10 06 51 10 10 20 J0112+3208 21 14 03 42.9 90.5 -4.0 -46.6 -21 147 No stop 10 11 50 =0110+318 21 15 33 43.1 90.8 -4.0 -46.6 69 153 10 10 21 10 11 50 0116+319 21 15 33 42.1 89.4 -4.1 -46.6 -20 153 No stop 10 15 20 --- 21 19 03 42.7 90.1 -4.0 -46.6 190 166 10 11 51 Schedule for DEFFORD (Code De ) Page 3 ET048B 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 10 Mar 2022 Day 69 --- 10 16 00 J0112+3208 21 19 44 43.8 91.6 -3.9 -46.6 19 166 10 16 00 10 17 30 =0110+318 21 21 14 44.0 91.9 -3.9 -46.5 90 172 10 16 01 10 17 30 0116+319 21 21 14 43.0 90.5 -4.0 -46.6 -20 172 No stop 10 21 00 --- 21 24 44 43.5 91.2 -3.9 -46.6 190 185 10 17 31 10 21 00 J0112+3208 21 24 44 44.6 92.6 -3.8 -46.5 -21 185 No stop 10 22 30 =0110+318 21 26 15 44.8 92.9 -3.8 -46.5 69 191 10 21 01 10 22 30 0116+319 21 26 15 43.8 91.5 -3.9 -46.6 -20 191 No stop 10 26 00 --- 21 29 45 44.3 92.2 -3.9 -46.6 190 205 10 22 31 10 26 40 J0112+3208 21 30 25 45.4 93.8 -3.7 -46.5 19 205 10 26 40 10 28 10 =0110+318 21 31 55 45.7 94.1 -3.7 -46.4 90 211 10 26 41 10 28 10 0116+319 21 31 55 44.6 92.7 -3.8 -46.5 -21 211 No stop 10 31 40 --- 21 35 26 45.2 93.4 -3.8 -46.5 189 224 10 28 11 10 31 40 J0112+3208 21 35 26 46.2 94.8 -3.6 -46.4 -21 224 No stop 10 33 10 =0110+318 21 36 56 46.4 95.1 -3.6 -46.3 69 230 10 31 41 10 33 10 0116+319 21 36 56 45.4 93.7 -3.7 -46.5 -21 230 No stop 10 36 40 --- 21 40 27 46.0 94.4 -3.7 -46.4 189 243 10 33 11 10 37 20 J0112+3208 21 41 07 47.1 96.0 -3.5 -46.2 18 243 10 37 20 10 38 50 =0110+318 21 42 37 47.3 96.4 -3.5 -46.2 90 249 10 37 21 10 38 50 0116+319 21 42 37 46.3 94.9 -3.6 -46.4 -21 249 No stop 10 42 20 --- 21 46 08 46.8 95.6 -3.6 -46.3 189 263 10 38 51 10 42 20 J0112+3208 21 46 08 47.8 97.1 -3.5 -46.1 -22 263 No stop 10 43 50 =0110+318 21 47 38 48.1 97.5 -3.4 -46.1 68 269 10 42 21 10 43 50 0116+319 21 47 38 47.1 95.9 -3.6 -46.3 -21 269 No stop 10 47 20 --- 21 51 09 47.6 96.7 -3.5 -46.2 189 282 10 43 51 10 48 00 J0112+3208 21 51 49 48.7 98.4 -3.4 -45.9 18 282 10 48 00 10 49 30 =0110+318 21 53 19 48.9 98.7 -3.3 -45.9 90 288 10 48 01 10 49 30 0116+319 21 53 19 47.9 97.2 -3.5 -46.1 -21 288 No stop 10 53 00 --- 21 56 50 48.5 97.9 -3.4 -46.0 189 301 10 49 31 10 53 00 J0112+3208 21 56 50 49.5 99.5 -3.3 -45.8 -22 301 No stop 10 54 30 =0110+318 21 58 20 49.7 99.8 -3.3 -45.7 68 307 10 53 01 Schedule for DEFFORD (Code De ) Page 4 ET048B 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 10 Mar 2022 Day 69 --- 10 54 30 0116+319 21 58 20 48.7 98.3 -3.4 -46.0 -21 307 No stop 10 58 00 --- 22 01 50 49.2 99.1 -3.3 -45.9 189 321 10 54 31 10 58 40 J0112+3208 22 02 31 50.3 100.8 -3.2 -45.5 18 321 10 58 40 11 00 10 =0110+318 22 04 01 50.5 101.2 -3.2 -45.4 90 327 10 58 41 11 00 10 0116+319 22 04 01 49.5 99.6 -3.3 -45.8 -22 327 No stop 11 03 40 --- 22 07 31 50.1 100.4 -3.2 -45.6 188 340 11 00 11 11 03 40 J0112+3208 22 07 31 51.1 102.0 -3.1 -45.3 -23 340 No stop 11 05 10 =0110+318 22 09 02 51.3 102.3 -3.1 -45.2 67 346 11 03 41 11 05 10 0116+319 22 09 02 50.3 100.7 -3.2 -45.6 -22 346 No stop 11 08 40 --- 22 12 32 50.8 101.5 -3.1 -45.4 188 359 11 05 11 11 09 20 J0112+3208 22 13 12 51.9 103.3 -3.0 -45.0 17 359 11 09 20 11 10 50 =0110+318 22 14 43 52.1 103.7 -3.0 -44.9 90 365 11 09 21 11 10 50 J0112+3208 22 14 43 52.1 103.7 -3.0 -44.9 -2 365 No stop 11 14 20 =0110+318 22 18 13 52.7 104.6 -2.9 -44.7 208 379 11 10 51 11 16 20 J0344+1559 22 20 13 17.9 86.6 -5.4 -39.7 -7 379 11 16 20 11 21 20 =0341+158 22 25 14 18.7 87.6 -5.3 -39.7 293 398 11 16 21 11 21 20 J0344+1559 22 25 14 18.7 87.6 -5.3 -39.7 -2 398 No stop 11 22 50 =0341+158 22 26 44 18.9 87.9 -5.3 -39.7 88 404 11 21 21 11 22 50 0350+177 22 26 44 19.0 85.0 -5.5 -40.0 -29 404 No stop 11 26 20 --- 22 30 15 19.6 85.6 -5.4 -40.1 181 417 11 22 51 11 26 20 J0344+1559 22 30 15 19.4 88.6 -5.3 -39.7 -30 417 No stop 11 27 50 =0341+158 22 31 45 19.7 88.9 -5.2 -39.7 60 423 11 26 21 11 27 50 0350+177 22 31 45 19.8 85.9 -5.4 -40.1 -29 423 No stop 11 31 20 --- 22 35 16 20.4 86.6 -5.3 -40.1 181 437 11 27 51 11 32 00 J0344+1559 22 35 56 20.3 89.7 -5.2 -39.7 10 437 11 32 00 11 33 30 =0341+158 22 37 26 20.5 90.0 -5.1 -39.7 90 442 11 32 01 11 33 30 0350+177 22 37 26 20.7 87.0 -5.3 -40.2 -29 442 No stop 11 37 00 --- 22 40 57 21.2 87.7 -5.2 -40.2 181 456 11 33 31 11 37 00 J0344+1559 22 40 57 21.1 90.7 -5.1 -39.7 -30 456 No stop 11 38 30 =0341+158 22 42 27 21.3 91.0 -5.1 -39.7 60 462 11 37 01 Schedule for DEFFORD (Code De ) Page 5 ET048B 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 10 Mar 2022 Day 69 --- 11 38 30 0350+177 22 42 27 21.5 88.0 -5.2 -40.2 -29 462 No stop 11 42 00 --- 22 45 58 22.0 88.7 -5.1 -40.2 181 475 11 38 31 11 42 40 J0344+1559 22 46 38 21.9 91.8 -5.0 -39.7 10 475 11 42 40 11 44 10 =0341+158 22 48 08 22.2 92.1 -5.0 -39.7 90 481 11 42 41 11 44 10 0350+177 22 48 08 22.3 89.1 -5.1 -40.2 -29 481 No stop 11 47 40 --- 22 51 39 22.9 89.8 -5.0 -40.2 181 495 11 44 11 11 47 40 J0344+1559 22 51 39 22.7 92.8 -4.9 -39.7 -30 495 No stop 11 49 10 =0341+158 22 53 09 22.9 93.1 -4.9 -39.7 60 500 11 47 41 11 49 10 0350+177 22 53 09 23.1 90.1 -5.0 -40.2 -29 500 No stop 11 52 40 --- 22 56 39 23.6 90.8 -5.0 -40.2 181 514 11 49 11 11 53 20 J0344+1559 22 57 19 23.6 94.0 -4.8 -39.6 10 514 11 53 20 11 54 50 =0341+158 22 58 50 23.8 94.3 -4.8 -39.6 90 520 11 53 21 11 54 50 0350+177 22 58 50 24.0 91.2 -4.9 -40.2 -29 520 No stop 11 58 20 --- 23 02 20 24.5 91.9 -4.9 -40.2 181 533 11 54 51 11 58 20 J0344+1559 23 02 20 24.3 95.0 -4.7 -39.6 -30 533 No stop 11 59 50 =0341+158 23 03 51 24.6 95.3 -4.7 -39.5 60 539 11 58 21 11 59 50 0350+177 23 03 51 24.7 92.2 -4.8 -40.2 -29 539 No stop 12 03 20 --- 23 07 21 25.3 92.9 -4.8 -40.2 181 553 11 59 51 12 04 00 J0344+1559 23 08 01 25.2 96.1 -4.6 -39.5 10 553 12 04 00 12 05 30 =0341+158 23 09 31 25.4 96.5 -4.6 -39.4 90 558 12 04 01 12 05 30 0350+177 23 09 31 25.6 93.4 -4.7 -40.1 -29 558 No stop 12 09 00 --- 23 13 02 26.2 94.1 -4.7 -40.1 181 572 12 05 31 12 09 00 J0344+1559 23 13 02 26.0 97.2 -4.5 -39.4 -30 572 No stop 12 10 30 =0341+158 23 14 32 26.2 97.5 -4.5 -39.3 60 578 12 09 01 12 10 30 0350+177 23 14 32 26.4 94.4 -4.7 -40.1 -29 578 No stop 12 14 00 --- 23 18 03 26.9 95.1 -4.6 -40.0 181 591 12 10 31 12 14 40 J0344+1559 23 18 43 26.8 98.4 -4.4 -39.2 10 591 12 14 40 12 16 10 =0341+158 23 20 13 27.1 98.7 -4.4 -39.2 90 597 12 14 41 12 16 10 0350+177 23 20 13 27.2 95.5 -4.6 -40.0 -30 597 No stop 12 19 40 --- 23 23 44 27.8 96.3 -4.5 -39.9 180 611 12 16 11 Schedule for DEFFORD (Code De ) Page 6 ET048B 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 10 Mar 2022 Day 69 --- 12 19 40 J0344+1559 23 23 44 27.6 99.4 -4.4 -39.1 -30 611 No stop 12 21 10 =0341+158 23 25 14 27.8 99.7 -4.3 -39.1 60 616 12 19 41 12 21 10 0350+177 23 25 14 28.0 96.6 -4.5 -39.9 -30 616 No stop 12 24 40 --- 23 28 45 28.6 97.3 -4.4 -39.8 180 630 12 21 11 12 25 20 J0344+1559 23 29 25 28.5 100.6 -4.3 -38.9 9 630 12 25 20 12 26 50 =0341+158 23 30 55 28.7 100.9 -4.2 -38.9 90 636 12 25 21 12 26 50 0350+177 23 30 55 28.9 97.7 -4.4 -39.8 -30 636 No stop 12 30 20 --- 23 34 26 29.4 98.5 -4.3 -39.7 180 649 12 26 51 12 30 20 J0344+1559 23 34 26 29.2 101.7 -4.2 -38.8 -31 649 No stop 12 31 50 =0341+158 23 35 56 29.4 102.0 -4.2 -38.7 59 655 12 30 21 12 31 50 0350+177 23 35 56 29.6 98.8 -4.3 -39.7 -30 655 No stop 12 35 20 --- 23 39 26 30.2 99.5 -4.2 -39.6 180 669 12 31 51 12 36 00 J0344+1559 23 40 06 30.1 102.9 -4.1 -38.5 9 669 12 36 00 12 37 30 =0341+158 23 41 37 30.3 103.2 -4.1 -38.5 90 674 12 36 01 12 37 30 0350+177 23 41 37 30.5 100.0 -4.2 -39.5 -30 674 No stop 12 41 00 --- 23 45 07 31.0 100.8 -4.2 -39.4 180 688 12 37 31 12 41 00 J0344+1559 23 45 07 30.8 104.0 -4.0 -38.3 -31 688 No stop 12 42 30 =0341+158 23 46 38 31.0 104.3 -4.0 -38.3 59 694 12 41 01 12 42 30 0350+177 23 46 38 31.3 101.1 -4.1 -39.3 -30 694 No stop 12 46 00 --- 23 50 08 31.8 101.8 -4.1 -39.2 180 707 12 42 31 12 46 40 J0344+1559 23 50 48 31.7 105.3 -3.9 -38.1 9 707 12 46 40 12 48 10 =0341+158 23 52 18 31.9 105.6 -3.9 -38.0 90 713 12 46 41 12 48 10 0350+177 23 52 18 32.1 102.3 -4.0 -39.1 -30 713 No stop 12 51 40 --- 23 55 49 32.6 103.1 -4.0 -39.0 180 727 12 48 11 12 51 40 J0344+1559 23 55 49 32.4 106.4 -3.8 -37.8 -31 727 No stop 12 53 10 =0341+158 23 57 19 32.6 106.7 -3.8 -37.8 59 732 12 51 41 12 53 10 0350+177 23 57 19 32.9 103.4 -3.9 -38.9 -30 732 No stop 12 56 40 --- 00 00 50 33.4 104.2 -3.9 -38.8 180 746 12 53 11 12 57 20 J0344+1559 00 01 30 33.2 107.7 -3.7 -37.5 9 746 12 57 20 12 58 50 =0341+158 00 03 00 33.5 108.0 -3.7 -37.4 90 752 12 57 21 Schedule for DEFFORD (Code De ) Page 7 ET048B 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 10 Mar 2022 Day 69 --- 12 58 50 J0344+1559 00 03 00 33.5 108.0 -3.7 -37.4 -2 752 No stop 13 00 00 =0341+158 00 04 10 33.6 108.3 -3.7 -37.4 68 756 12 58 51 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess122.C1024 --- 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: 21 Station: DEFFORD Total bit rate: 512 Format: VDIF Bits per sample: 2 Sample rate:128.000 Number of channels: 2 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 5664.00 5664.00 Net SB= U U IF SB = L L Pol. = RCP LCP BBC = 1 9 BBC SB= L L IF = A1 B1 The following frequency sets based on these setups were used. Frequency Set: 17 Setup file default. Used with PCAL = off LO sum= 4958.49 4958.49 BBC fr= 705.51 705.51 Bandwd= 64.00 64.00 Matching frequency sets: 17 18 19 20 21 Track assignments are: track1= 1, 2 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * 0116+319 01 16 47.245342 * 01 19 35.000876 01 20 47.235190 0.00 J0119+3210 31 55 05.83643 * 32 10 50.06197 32 17 43.24396 0.00 From catalog imbedded in main SCHED input file. Titov,ET048B * 0350+177 03 50 00.966044 * 03 52 52.916665 03 54 07.877792 0.00 J0352+1754 17 45 43.68362 * 17 54 36.73124 17 58 29.71015 0.00 From catalog imbedded in main SCHED input file. Titov,ET048B 0110+318 01 10 03.762623 * 01 12 50.333053 01 14 02.020049 0.09 * J0112+3208 31 52 23.76439 * 32 08 17.43262 32 15 14.44864 0.12 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 152 observations. 0202+319 02 02 09.652800 * 02 05 04.925362 02 06 20.670193 0.00 * J0205+3212 31 58 10.39522 * 32 12 30.09544 32 18 48.04475 0.00 J0205+32 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 49141 observations. 0341+158 03 41 33.676026 * 03 44 23.172163 03 45 37.016823 0.05 * J0344+1559 15 50 19.30713 * 15 59 43.36917 16 03 49.23475 0.09 J0344+15 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 503 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 0116+319 sess122.C1024 1 2 3 4 5 6 7 8 9 10 11 12 + 0.933 176.426 0350+177 sess122.C1024 1 2 3 4 5 6 7 8 9 10 11 12 + 1.050 192.736 J0112+3208 sess122.C1024 1 2 3 4 5 6 7 8 9 10 11 12 + 0.567 107.988 J0205+3212 sess122.C1024 1 2 3 4 5 6 7 8 9 10 11 12 + 0.133 28.000 J0344+1559 sess122.C1024 1 2 3 4 5 6 7 8 9 10 11 12 + 0.578 102.742 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) 0116+319 45.9 0350+177 70.4 J0112+3208 44.9 J0205+3212 53.1 J0344+1559 68.0 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