COVER INFORMATION Station: HART (Code Hh ) Experiment: Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales Exp. Code: EG131H Schedule Version: 1.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Salmoli Ghosh Address: National Centre for Radio Astrophysics - TIFR S.P. Pune Univ. Campus, Ganeshkhind Pune India : 411007 Phone: (+91)020-25719000 EMAIL: salmoli.ghosh@gmail.com Fax: Phone during observation: (+91)8240982699/(+91)020-25719230 Observing mode: Phase-referencing continuum Notes: PCAL OFF Schedule for HART (Code Hh ) Page 2 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales 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: 116.49 116.49 116.49 116.49 180.49 180.49 180.49 180.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 13 30 00 3C84 02 03 07 20.1 15.5 -1.3 0.0 0 0 13 30 00 13 37 00 --- 02 10 08 20.5 14.2 -1.2 0.0 420 54 13 30 01 13 42 00 J0310-0823 02 15 09 67.9 39.7 -0.9 0.0 173 54 13 42 00 13 47 00 =0307-085 02 20 10 68.6 36.9 -0.9 0.0 300 93 13 42 01 13 47 00 NGC1241 02 20 10 68.9 38.4 -0.9 0.0 -25 93 No stop 13 50 30 --- 02 23 40 69.4 36.4 -0.8 0.0 185 120 13 47 01 13 51 00 J0310-0823 02 24 10 69.2 34.6 -0.8 0.0 5 120 13 51 00 13 52 00 =0307-085 02 25 10 69.3 34.0 -0.8 0.0 60 128 13 51 01 13 52 00 NGC1241 02 25 10 69.6 35.5 -0.8 0.0 -25 128 No stop 13 55 30 --- 02 28 41 70.0 33.3 -0.7 0.0 185 155 13 52 01 13 55 30 J0310-0823 02 28 41 69.7 31.8 -0.7 0.0 -25 155 No stop 13 57 00 =0307-085 02 30 11 69.9 30.9 -0.7 0.0 65 166 13 55 31 13 57 00 NGC1241 02 30 11 70.2 32.4 -0.7 0.0 -25 166 No stop 14 00 30 --- 02 33 42 70.6 30.1 -0.6 0.0 185 193 13 57 01 14 01 00 J0310-0823 02 34 12 70.3 28.2 -0.6 0.0 5 193 14 01 00 14 02 00 =0307-085 02 35 12 70.4 27.6 -0.6 0.0 60 201 14 01 01 14 02 00 NGC1241 02 35 12 70.8 29.1 -0.6 0.0 -25 201 No stop 14 05 30 --- 02 38 43 71.2 26.7 -0.6 0.0 185 228 14 02 01 14 05 30 J0310-0823 02 38 43 70.8 25.2 -0.5 0.0 -25 228 No stop 14 07 00 =0307-085 02 40 13 70.9 24.1 -0.5 0.0 65 240 14 05 31 14 07 00 NGC1241 02 40 13 71.3 25.6 -0.5 0.0 -25 240 No stop 14 10 30 --- 02 43 43 71.6 23.1 -0.5 0.0 185 267 14 07 01 14 11 00 J0310-0823 02 44 14 71.3 21.3 -0.5 0.0 5 267 14 11 00 14 12 00 =0307-085 02 45 14 71.4 20.5 -0.4 0.0 60 274 14 11 01 14 12 00 NGC1241 02 45 14 71.8 22.0 -0.5 0.0 -25 274 No stop 14 15 30 --- 02 48 44 72.0 19.3 -0.4 0.0 185 301 14 12 01 14 15 30 J0310-0823 02 48 44 71.6 17.9 -0.4 0.0 -25 301 No stop 14 17 00 =0307-085 02 50 14 71.7 16.8 -0.4 0.0 65 313 14 15 31 Schedule for HART (Code Hh ) Page 3 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales 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 --- 14 17 00 NGC1241 02 50 14 72.1 18.2 -0.4 0.0 -25 313 No stop 14 20 30 --- 02 53 45 72.4 15.4 -0.3 0.0 185 340 14 17 01 14 21 00 J0310-0823 02 54 15 72.0 13.7 -0.3 0.0 5 340 14 21 00 14 22 00 =0307-085 02 55 15 72.0 12.9 -0.3 0.0 60 348 14 21 01 14 22 00 NGC1241 02 55 15 72.5 14.2 -0.3 0.0 -25 348 No stop 14 25 30 --- 02 58 46 72.6 11.4 -0.2 0.0 185 375 14 22 01 14 25 30 J0310-0823 02 58 46 72.2 10.1 -0.2 0.0 -25 375 No stop 14 27 00 =0307-085 03 00 16 72.2 8.9 -0.2 0.0 65 386 14 25 31 14 27 00 NGC1241 03 00 16 72.7 10.2 -0.2 0.0 -25 386 No stop 14 30 30 --- 03 03 47 72.8 7.3 -0.1 0.0 185 414 14 27 01 14 31 00 J0310-0823 03 04 17 72.3 5.7 -0.1 0.0 5 414 14 31 00 14 32 00 =0307-085 03 05 17 72.4 4.9 -0.1 0.0 60 421 14 31 01 14 32 00 NGC1241 03 05 17 72.9 6.0 -0.1 0.0 -25 421 No stop 14 35 30 --- 03 08 48 72.9 3.1 -0.1 0.0 185 448 14 32 01 14 35 30 J0310-0823 03 08 48 72.4 2.0 -0.0 0.0 -25 448 No stop 14 37 00 =0307-085 03 10 18 72.4 0.8 -0.0 0.0 65 460 14 35 31 14 37 00 NGC1241 03 10 18 72.9 1.8 -0.0 0.0 -25 460 No stop 14 40 30 --- 03 13 48 72.9 358.9 0.0 0.0 185 487 14 37 01 14 41 00 J0310-0823 03 14 18 72.4 357.5 0.1 0.0 5 487 14 41 00 14 42 00 =0307-085 03 15 19 72.4 356.7 0.1 0.0 60 495 14 41 01 14 42 00 NGC1241 03 15 19 72.9 357.6 0.0 0.0 -25 495 No stop 14 45 30 --- 03 18 49 72.9 354.7 0.1 0.0 185 522 14 42 01 14 45 30 J0310-0823 03 18 49 72.3 353.8 0.1 0.0 -25 522 No stop 14 47 00 =0307-085 03 20 19 72.3 352.6 0.2 0.0 65 533 14 45 31 14 47 00 NGC1241 03 20 19 72.8 353.4 0.1 0.0 -25 533 No stop 14 50 30 --- 03 23 50 72.7 350.5 0.2 0.0 185 560 14 47 01 14 51 00 J0310-0823 03 24 20 72.1 349.4 0.2 0.0 5 560 14 51 00 14 52 00 =0307-085 03 25 20 72.1 348.6 0.2 0.0 60 568 14 51 01 14 52 00 NGC1241 03 25 20 72.7 349.3 0.2 0.0 -25 568 No stop 14 55 30 --- 03 28 51 72.5 346.4 0.3 0.0 185 595 14 52 01 Schedule for HART (Code Hh ) Page 4 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales 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 --- 14 55 30 J0310-0823 03 28 51 71.9 345.8 0.3 0.0 -25 595 No stop 14 57 00 =0307-085 03 30 21 71.8 344.7 0.3 0.0 65 607 14 55 31 14 57 00 NGC1241 03 30 21 72.4 345.2 0.3 0.0 -25 607 No stop 15 00 30 --- 03 33 52 72.2 342.5 0.4 0.0 185 634 14 57 01 15 01 00 J0310-0823 03 34 22 71.6 341.6 0.4 0.0 5 634 15 01 00 15 02 00 =0307-085 03 35 22 71.5 340.9 0.4 0.0 60 642 15 01 01 15 02 00 NGC1241 03 35 22 72.1 341.3 0.4 0.0 -25 642 No stop 15 05 30 --- 03 38 52 71.8 338.6 0.4 0.0 185 669 15 02 01 15 05 30 J0310-0823 03 38 52 71.2 338.3 0.5 0.0 -25 669 No stop 15 07 00 =0307-085 03 40 23 71.1 337.2 0.5 0.0 65 680 15 05 31 15 07 00 NGC1241 03 40 23 71.7 337.5 0.5 0.0 -25 680 No stop 15 10 30 --- 03 43 53 71.4 335.0 0.5 0.0 185 707 15 07 01 15 11 00 J0310-0823 03 44 23 70.7 334.4 0.6 0.0 5 707 15 11 00 15 12 00 =0307-085 03 45 24 70.6 333.7 0.6 0.0 60 715 15 11 01 15 12 00 NGC1241 03 45 24 71.2 333.9 0.5 0.0 -25 715 No stop 15 15 30 --- 03 48 54 70.9 331.5 0.6 0.0 185 742 15 12 01 15 15 30 J0310-0823 03 48 54 70.3 331.4 0.6 0.0 -25 742 No stop 15 17 00 =0307-085 03 50 24 70.1 330.4 0.7 0.0 65 754 15 15 31 15 17 00 NGC1241 03 50 24 70.7 330.5 0.6 0.0 -25 754 No stop 15 20 30 --- 03 53 55 70.3 328.2 0.7 0.0 185 781 15 17 01 15 21 00 J0310-0823 03 54 25 69.6 327.8 0.7 0.0 5 781 15 21 00 15 22 00 =0307-085 03 55 25 69.5 327.2 0.7 0.0 60 788 15 21 01 15 22 00 NGC1241 03 55 25 70.1 327.2 0.7 0.0 -25 788 No stop 15 25 30 --- 03 58 56 69.7 325.0 0.8 0.0 185 815 15 22 01 15 25 30 J0310-0823 03 58 56 69.1 325.1 0.8 0.0 -25 815 No stop 15 27 00 =0307-085 04 00 26 68.9 324.2 0.8 0.0 65 827 15 25 31 15 27 00 NGC1241 04 00 26 69.5 324.1 0.8 0.0 -25 827 No stop 15 30 30 --- 04 03 57 69.0 322.1 0.9 0.0 185 854 15 27 01 15 31 00 J0310-0823 04 04 27 68.3 321.9 0.9 0.0 5 854 15 31 00 15 32 00 =0307-085 04 05 27 68.2 321.4 0.9 0.0 60 862 15 31 01 Schedule for HART (Code Hh ) Page 5 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales 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 --- 15 32 00 NGC1241 04 05 27 68.8 321.2 0.9 0.0 -25 862 No stop 15 35 30 --- 04 08 57 68.3 319.3 0.9 0.0 185 889 15 32 01 15 35 30 J0310-0823 04 08 57 67.7 319.5 1.0 0.0 -25 889 No stop 15 37 00 =0307-085 04 10 28 67.5 318.7 1.0 0.0 65 900 15 35 31 15 37 00 NGC1241 04 10 28 68.1 318.5 1.0 0.0 -25 900 No stop 15 40 30 --- 04 13 58 67.5 316.7 1.0 0.0 185 927 15 37 01 15 41 00 J0310-0823 04 14 28 66.9 316.7 1.1 0.0 5 927 15 41 00 15 42 00 =0307-085 04 15 28 66.7 316.2 1.1 0.0 60 935 15 41 01 15 42 00 NGC1241 04 15 28 67.3 315.9 1.1 0.0 -25 935 No stop 15 45 30 --- 04 18 59 66.8 314.2 1.1 0.0 185 962 15 42 01 15 45 30 J0310-0823 04 18 59 66.2 314.5 1.1 0.0 -25 962 No stop 15 47 00 =0307-085 04 20 29 65.9 313.8 1.2 0.0 65 974 15 45 31 15 47 00 NGC1241 04 20 29 66.5 313.5 1.1 0.0 -25 974 No stop 15 50 30 --- 04 24 00 65.9 311.9 1.2 0.0 185 1001 15 47 01 15 51 00 J0310-0823 04 24 30 65.3 312.0 1.2 0.0 5 1001 15 51 00 15 52 00 =0307-085 04 25 30 65.1 311.6 1.2 0.0 60 1009 15 51 01 15 52 00 NGC1241 04 25 30 65.7 311.3 1.2 0.0 -25 1009 No stop 15 55 30 --- 04 29 01 65.1 309.8 1.3 0.0 185 1036 15 52 01 15 55 30 J0310-0823 04 29 01 64.5 310.1 1.3 0.0 -25 1036 No stop 15 57 00 =0307-085 04 30 31 64.2 309.5 1.3 0.0 65 1047 15 55 31 15 57 00 NGC1241 04 30 31 64.8 309.1 1.3 0.0 -25 1047 No stop 16 00 30 --- 04 34 01 64.2 307.7 1.4 0.0 185 1074 15 57 01 16 01 00 J0310-0823 04 34 32 63.5 307.9 1.4 0.0 5 1074 16 01 00 16 02 00 =0307-085 04 35 32 63.3 307.5 1.4 0.0 60 1082 16 01 01 16 02 00 NGC1241 04 35 32 63.9 307.1 1.4 0.0 -25 1082 No stop 16 05 30 --- 04 39 02 63.3 305.8 1.4 0.0 185 1109 16 02 01 16 05 30 J0310-0823 04 39 02 62.7 306.2 1.5 0.0 -25 1109 No stop 16 07 00 =0307-085 04 40 33 62.4 305.7 1.5 0.0 65 1121 16 05 31 16 07 00 NGC1241 04 40 33 63.0 305.3 1.5 0.0 -25 1121 No stop 16 10 30 --- 04 44 03 62.4 304.0 1.5 0.0 185 1148 16 07 01 Schedule for HART (Code Hh ) Page 6 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales 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 --- 16 11 00 J0310-0823 04 44 33 61.7 304.3 1.6 0.0 5 1148 16 11 00 16 12 00 =0307-085 04 45 33 61.5 303.9 1.6 0.0 60 1156 16 11 01 16 12 00 NGC1241 04 45 33 62.1 303.5 1.6 0.0 -25 1156 No stop 16 15 30 --- 04 49 04 61.4 302.3 1.6 0.0 185 1183 16 12 01 16 15 30 J0310-0823 04 49 04 60.9 302.7 1.6 0.0 -25 1183 No stop 16 17 00 =0307-085 04 50 34 60.6 302.3 1.7 0.0 65 1194 16 15 31 16 17 00 NGC1241 04 50 34 61.1 301.8 1.6 0.0 -25 1194 No stop 16 20 30 --- 04 54 05 60.5 300.7 1.7 0.0 185 1221 16 17 01 16 21 00 J0310-0823 04 54 35 59.8 301.0 1.7 0.0 5 1221 16 21 00 16 22 00 =0307-085 04 55 35 59.6 300.7 1.7 0.0 60 1229 16 21 01 16 22 00 NGC1241 04 55 35 60.2 300.2 1.7 0.0 -25 1229 No stop 16 25 30 --- 04 59 06 59.5 299.2 1.8 0.0 185 1256 16 22 01 16 25 30 J0310-0823 04 59 06 58.9 299.6 1.8 0.0 -25 1256 No stop 16 27 00 =0307-085 05 00 36 58.6 299.2 1.8 0.0 65 1268 16 25 31 16 27 00 NGC1241 05 00 36 59.2 298.7 1.8 0.0 -25 1268 No stop 16 30 30 --- 05 04 06 58.5 297.7 1.9 0.0 185 1295 16 27 01 16 31 00 J0310-0823 05 04 37 57.8 298.1 1.9 0.0 5 1295 16 31 00 16 32 00 =0307-085 05 05 37 57.6 297.8 1.9 0.0 60 1302 16 31 01 16 32 00 NGC1241 05 05 37 58.2 297.3 1.9 0.0 -25 1302 No stop 16 35 30 --- 05 09 07 57.5 296.4 1.9 0.0 185 1329 16 32 01 16 35 30 J0310-0823 05 09 07 56.9 296.8 2.0 0.0 -25 1329 No stop 16 37 00 =0307-085 05 10 37 56.6 296.4 2.0 0.0 65 1341 16 35 31 16 37 00 NGC1241 05 10 37 57.2 296.0 2.0 0.0 -25 1341 No stop 16 40 30 --- 05 14 08 56.5 295.1 2.0 0.0 185 1368 16 37 01 16 41 00 J0310-0823 05 14 38 55.8 295.4 2.1 0.0 5 1368 16 41 00 16 42 00 =0307-085 05 15 38 55.6 295.2 2.1 0.0 60 1376 16 41 01 16 42 00 NGC1241 05 15 38 56.2 294.7 2.1 0.0 -25 1376 No stop 16 45 30 --- 05 19 09 55.4 293.8 2.1 0.0 185 1403 16 42 01 16 45 30 J0310-0823 05 19 09 54.9 294.3 2.1 0.0 -25 1403 No stop 16 47 00 =0307-085 05 20 39 54.6 293.9 2.2 0.0 65 1414 16 45 31 Schedule for HART (Code Hh ) Page 7 Tracing the Radio Outflows in RQ AGN from Pc- to Kpc-scales 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 --- 16 47 00 NGC1241 05 20 39 55.1 293.5 2.1 0.0 -25 1414 No stop 16 51 00 --- 05 24 40 54.3 292.5 2.2 0.0 215 1445 16 47 01 16 51 00 J0310-0823 05 24 40 53.8 293.0 2.2 0.0 -25 1445 No stop 16 53 00 =0307-085 05 26 40 53.4 292.6 2.3 0.0 95 1461 16 51 01 16 55 00 3C84 05 28 40 16.4 335.8 2.1 0.0 -7 1461 16 55 00 17 00 00 --- 05 33 41 15.9 334.9 2.2 0.0 293 1499 16 55 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 Matching groups in /home/guest/rmc/SCHED/sched11.6/catalogs/freq_RDBE.dat: hh18cm Values confirmed by E-mail Jonathan Quick 20140219 (CR) ****** Only 122.49 of 256.00 MHz total bandwidth is within the IFs in the setup file before any FREQ or DOPPLER shifts. Setup group: 5 Station: HART 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= 1510.00 1510.00 1510.00 1510.00 1510.00 1510.00 1510.00 1510.00 Net SB= L L U U L L U U IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 2 10 2 10 BBC SB= L L U U L L U U IF = A1 C1 A1 C1 A1 C1 A1 C1 The following frequency sets based on these setups were used. Frequency Set: 9 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= 116.49 116.49 116.49 116.49 180.49 180.49 180.49 180.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 9 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) * NGC1241 03 08 48.674588 * 03 11 14.610000 03 12 27.755381 0.00 -09 06 35.71543 *-08 55 18.70000 -08 49 43.89682 0.00 From catalog imbedded in main SCHED input file. 0307-085 03 07 35.614122 * 03 10 02.049331 03 11 15.438452 0.21 * J0310-0823 -08 35 00.21166 *-08 23 39.29548 -08 18 02.39908 0.41 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 86 observations. * 3C84 03 16 29.567265 * 03 19 48.160096 03 21 27.593753 1.50 J0319+4130 41 19 51.91692 * 41 30 42.10404 41 36 19.13310 2.86 0316+413 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J0319+41 GSFC 2016a X/S astro solution, 10291 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 NGC1241 sess125.L1024 1 2 3 4 5 7 8 9 10 2.167 141.978 J0310-0823 sess125.L1024 1 2 3 4 5 7 8 9 10 0.867 51.495 3C84 sess125.L1024 1 2 3 4 5 6 7 8 9 10 0.200 15.001 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) NGC1241 63.8 J0310-0823 63.5 3C84 77.7 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