COVER INFORMATION Station: HART (Code Hh ) Experiment: Imaging variable sources from Irbene monitoring program Exp. Code: EA063 Schedule Version: 6.00 Processed by SCHED version: 11.50 Development version 11.5. Started Apr. 2 PI: Artis Aberfelds Address: Ventspils International Radio Astronomy Centre Ventspils, Inzenieru iela 101, LV-3601 Latvia Phone: +361 26648339 EMAIL: artis.aberfelds@venta.lv Fax: Phone during observation: +361 26648339 Observing mode: MKV, 256Mb/s Notes: Please, make sure the PHASE CAL is OFF. Schedule for HART (Code Hh ) Page 2 Imaging variable sources from Irbene monitoring program 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 31 Oct 2019 Day 304 --- Next scan frequencies: 6663.51 6663.51 6663.51 6663.51 6671.51 6671.51 6671.51 6671.51 6679.51 6679.51 6679.51 6679.51 6687.52 6687.52 6687.52 6687.52 Next BBC frequencies: 153.51 153.51 153.51 153.51 161.51 161.51 161.51 161.51 169.51 169.51 169.51 169.51 177.52 177.52 177.52 177.52 Next scan bandwidths: 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 11 30 00 3C345 15 58 41 23.5 9.4 -0.7 0.0 0 0 11 30 00 11 33 00 --- 16 01 41 23.6 8.8 -0.7 0.0 180 6 11 30 01 12 01 45 3C345 16 30 31 24.3 2.8 -0.2 0.0 1703 6 12 01 45 12 05 45 --- 16 34 32 24.3 1.9 -0.2 0.0 240 14 12 01 46 12 57 17 J2007+4029 17 26 12 13.6 30.5 -2.7 0.0 2963 14 12 57 17 12 59 02 =2005+403 17 27 57 13.8 30.3 -2.7 0.0 105 17 12 57 18 12 59 02 G78.12 17 27 57 12.5 30.8 -2.8 0.0 -30 17 No stop 13 02 17 --- 17 31 13 12.8 30.4 -2.7 0.0 165 23 12 59 03 13 02 17 J2007+4029 17 31 13 14.2 29.8 -2.6 0.0 -30 23 No stop 13 04 02 =2005+403 17 32 58 14.4 29.5 -2.6 0.0 75 27 13 02 18 13 04 02 G78.12 17 32 58 13.0 30.1 -2.7 0.0 -30 27 No stop 13 07 17 --- 17 36 14 13.4 29.6 -2.6 0.0 165 33 13 04 03 13 07 57 J2007+4029 17 36 54 14.8 28.9 -2.5 0.0 10 33 13 07 57 13 09 42 =2005+403 17 38 39 15.0 28.6 -2.5 0.0 105 36 13 07 58 13 09 42 G78.12 17 38 39 13.7 29.2 -2.6 0.0 -30 36 No stop 13 12 57 --- 17 41 55 14.0 28.7 -2.6 0.0 165 43 13 09 43 13 12 57 J2007+4029 17 41 55 15.3 28.0 -2.4 0.0 -30 43 No stop 13 14 42 =2005+403 17 43 40 15.5 27.7 -2.4 0.0 75 46 13 12 58 13 14 42 G78.12 17 43 40 14.2 28.4 -2.5 0.0 -30 46 No stop 13 17 57 --- 17 46 55 14.6 27.9 -2.5 0.0 165 52 13 14 43 13 18 37 J2007+4029 17 47 36 15.9 27.1 -2.3 0.0 10 52 13 18 37 13 20 22 =2005+403 17 49 21 16.1 26.8 -2.3 0.0 105 56 13 18 38 14 08 42 J2007+4029 18 37 49 20.3 18.2 -1.5 0.0 2877 56 14 08 42 14 10 27 =2005+403 18 39 34 20.4 17.8 -1.5 0.0 105 59 14 08 43 14 10 27 G78.12 18 39 34 19.3 18.8 -1.6 0.0 -30 59 No stop 14 13 42 --- 18 42 49 19.5 18.2 -1.5 0.0 165 65 14 10 28 Schedule for HART (Code Hh ) Page 3 Imaging variable sources from Irbene monitoring program 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 31 Oct 2019 Day 304 --- 14 13 42 J2007+4029 18 42 49 20.6 17.2 -1.4 0.0 -30 65 No stop 14 15 27 =2005+403 18 44 35 20.8 16.9 -1.4 0.0 75 69 14 13 43 14 15 27 G78.12 18 44 35 19.6 17.9 -1.5 0.0 -30 69 No stop 14 18 42 --- 18 47 50 19.8 17.3 -1.5 0.0 165 75 14 15 28 14 19 22 J2007+4029 18 48 30 21.0 16.1 -1.3 0.0 10 75 14 19 22 14 21 07 =2005+403 18 50 16 21.1 15.8 -1.3 0.0 105 78 14 19 23 14 21 07 G78.12 18 50 16 20.0 16.8 -1.4 0.0 -30 78 No stop 14 24 22 --- 18 53 31 20.2 16.2 -1.4 0.0 165 85 14 21 08 14 24 22 J2007+4029 18 53 31 21.3 15.2 -1.2 0.0 -30 85 No stop 14 26 07 =2005+403 18 55 16 21.4 14.8 -1.2 0.0 75 88 14 24 23 14 26 07 G78.12 18 55 16 20.3 15.9 -1.3 0.0 -30 88 No stop 14 29 22 --- 18 58 32 20.5 15.3 -1.3 0.0 165 94 14 26 08 14 30 02 J2007+4029 18 59 12 21.6 14.1 -1.2 0.0 10 94 14 30 02 14 31 47 =2005+403 19 00 57 21.7 13.7 -1.1 0.0 105 98 14 30 03 14 31 47 G78.12 19 00 57 20.7 14.8 -1.2 0.0 -30 98 No stop 14 35 02 --- 19 04 13 20.8 14.2 -1.2 0.0 165 104 14 31 48 14 35 02 J2007+4029 19 04 13 21.9 13.1 -1.1 0.0 -30 104 No stop 14 36 47 =2005+403 19 05 58 22.0 12.7 -1.0 0.0 75 107 14 35 03 14 36 47 G78.12 19 05 58 20.9 13.8 -1.2 0.0 -30 107 No stop 14 40 02 --- 19 09 14 21.1 13.2 -1.1 0.0 165 114 14 36 48 14 40 42 J2007+4029 19 09 54 22.2 12.0 -1.0 0.0 10 114 14 40 42 14 42 27 =2005+403 19 11 39 22.3 11.6 -0.9 0.0 105 117 14 40 43 15 42 40 J2007+4029 20 12 02 23.5 359.3 0.1 0.0 3590 117 15 42 40 15 44 25 =2005+403 20 13 47 23.5 358.9 0.1 0.0 105 120 15 42 41 15 44 25 G78.12 20 13 47 22.8 0.3 -0.0 0.0 -30 120 No stop 15 47 40 --- 20 17 03 22.8 359.6 0.0 0.0 165 127 15 44 26 15 47 40 J2007+4029 20 17 03 23.5 358.2 0.1 0.0 -30 127 No stop 15 49 25 =2005+403 20 18 48 23.5 357.9 0.2 0.0 75 130 15 47 41 15 49 25 G78.12 20 18 48 22.8 359.2 0.1 0.0 -30 130 No stop 15 52 40 --- 20 22 04 22.8 358.6 0.1 0.0 165 136 15 49 26 Schedule for HART (Code Hh ) Page 4 Imaging variable sources from Irbene monitoring program 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 31 Oct 2019 Day 304 --- 15 53 20 J2007+4029 20 22 44 23.5 357.0 0.2 0.0 10 136 15 53 20 15 55 05 =2005+403 20 24 29 23.4 356.7 0.3 0.0 105 140 15 53 21 15 55 05 G78.12 20 24 29 22.8 358.1 0.2 0.0 -30 140 No stop 15 58 20 --- 20 27 45 22.8 357.4 0.2 0.0 165 146 15 55 06 15 58 20 J2007+4029 20 27 45 23.4 356.0 0.3 0.0 -30 146 No stop 16 00 05 =2005+403 20 29 30 23.4 355.6 0.4 0.0 75 149 15 58 21 16 00 05 G78.12 20 29 30 22.7 357.1 0.2 0.0 -30 149 No stop 16 03 20 --- 20 32 46 22.7 356.4 0.3 0.0 165 156 16 00 06 16 04 00 J2007+4029 20 33 26 23.3 354.8 0.4 0.0 10 156 16 04 00 16 05 45 =2005+403 20 35 11 23.3 354.5 0.4 0.0 105 159 16 04 01 17 08 37 J2007+4029 21 38 14 20.4 342.0 1.5 0.0 3749 159 17 08 37 17 10 22 =2005+403 21 39 59 20.2 341.6 1.5 0.0 105 162 17 08 38 17 10 22 G78.12 21 39 59 20.0 343.2 1.4 0.0 -30 162 No stop 17 13 37 --- 21 43 14 19.8 342.6 1.5 0.0 165 169 17 10 23 17 13 37 J2007+4029 21 43 14 20.0 341.0 1.6 0.0 -30 169 No stop 17 15 22 =2005+403 21 45 00 19.9 340.7 1.6 0.0 75 172 17 13 38 17 15 22 G78.12 21 45 00 19.7 342.2 1.5 0.0 -30 172 No stop 17 18 37 --- 21 48 15 19.4 341.6 1.6 0.0 165 178 17 15 23 17 19 17 J2007+4029 21 48 55 19.6 340.0 1.7 0.0 10 178 17 19 17 17 21 02 =2005+403 21 50 41 19.4 339.7 1.7 0.0 105 182 17 19 18 17 21 02 G78.12 21 50 41 19.3 341.2 1.6 0.0 -30 182 No stop 17 24 17 --- 21 53 56 19.0 340.6 1.6 0.0 165 188 17 21 03 17 24 17 J2007+4029 21 53 56 19.2 339.1 1.8 0.0 -30 188 No stop 17 26 02 =2005+403 21 55 41 19.0 338.7 1.8 0.0 75 191 17 24 18 17 26 02 G78.12 21 55 41 18.9 340.3 1.7 0.0 -30 191 No stop 17 29 17 --- 21 58 57 18.6 339.7 1.7 0.0 165 198 17 26 03 17 29 57 J2007+4029 21 59 37 18.7 338.0 1.9 0.0 10 198 17 29 57 17 31 42 =2005+403 22 01 22 18.6 337.7 1.9 0.0 105 201 17 29 58 17 31 42 G78.12 22 01 22 18.4 339.3 1.8 0.0 -30 201 No stop 17 34 57 --- 22 04 38 18.2 338.7 1.8 0.0 165 207 17 31 43 Schedule for HART (Code Hh ) Page 5 Imaging variable sources from Irbene monitoring program 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 31 Oct 2019 Day 304 --- 17 34 57 J2007+4029 22 04 38 18.3 337.1 1.9 0.0 -30 207 No stop 17 36 42 =2005+403 22 06 23 18.1 336.8 2.0 0.0 75 211 17 34 58 17 36 42 G78.12 22 06 23 18.0 338.4 1.9 0.0 -30 211 No stop 17 39 57 --- 22 09 39 17.8 337.8 1.9 0.0 165 217 17 36 43 17 40 37 J2007+4029 22 10 19 17.8 336.1 2.0 0.0 10 217 17 40 37 17 42 22 =2005+403 22 12 04 17.6 335.8 2.1 0.0 105 220 17 40 38 17 42 22 G78.12 22 12 04 17.6 337.4 1.9 0.0 -30 220 No stop 17 45 37 --- 22 15 20 17.3 336.8 2.0 0.0 165 227 17 42 23 17 45 37 J2007+4029 22 15 20 17.3 335.3 2.1 0.0 -30 227 No stop 17 47 22 =2005+403 22 17 05 17.1 335.0 2.1 0.0 75 230 17 45 38 17 47 22 G78.12 22 17 05 17.1 336.5 2.0 0.0 -30 230 No stop 17 50 37 --- 22 20 20 16.8 335.9 2.1 0.0 165 236 17 47 23 17 51 17 J2007+4029 22 21 01 16.8 334.3 2.2 0.0 10 236 17 51 17 17 53 02 =2005+403 22 22 46 16.6 334.0 2.2 0.0 105 240 17 51 18 ---------- EF back ---------- 18 19 41 J2007+4029 22 49 29 13.7 329.6 2.7 0.0 1577 240 18 19 41 18 21 26 =2005+403 22 51 14 13.5 329.4 2.7 0.0 105 243 18 19 42 18 21 26 G78.12 22 51 14 13.7 330.9 2.6 0.0 -30 243 No stop 18 24 41 --- 22 54 30 13.3 330.3 2.7 0.0 165 249 18 21 27 18 24 41 J2007+4029 22 54 30 13.2 328.9 2.8 0.0 -30 249 No stop 18 26 26 =2005+403 22 56 15 13.0 328.6 2.8 0.0 75 253 18 24 42 18 26 26 G78.12 22 56 15 13.1 330.1 2.7 0.0 -30 253 No stop 18 29 41 --- 22 59 31 12.8 329.6 2.7 0.0 165 259 18 26 27 18 30 21 J2007+4029 23 00 11 12.5 328.0 2.9 0.0 10 259 18 30 21 18 32 06 =2005+403 23 01 56 12.3 327.7 2.9 0.0 105 262 18 30 22 18 32 06 G78.12 23 01 56 12.5 329.2 2.8 0.0 -30 262 No stop 18 35 21 --- 23 05 12 12.1 328.7 2.8 0.0 165 269 18 32 07 18 35 21 J2007+4029 23 05 12 11.9 327.2 2.9 0.0 -30 269 No stop 18 37 06 =2005+403 23 06 57 11.7 327.0 3.0 0.0 75 272 18 35 22 Schedule for HART (Code Hh ) Page 6 Imaging variable sources from Irbene monitoring program 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 31 Oct 2019 Day 304 --- 18 37 06 G78.12 23 06 57 11.9 328.4 2.9 0.0 -30 272 No stop 18 40 21 --- 23 10 12 11.5 328.0 2.9 0.0 165 278 18 37 07 18 41 01 J2007+4029 23 10 53 11.2 326.4 3.0 0.0 10 278 18 41 01 18 42 46 =2005+403 23 12 38 11.0 326.1 3.1 0.0 105 282 18 41 02 18 42 46 G78.12 23 12 38 11.2 327.6 3.0 0.0 -30 282 No stop 18 46 01 --- 23 15 53 10.8 327.1 3.0 0.0 165 288 18 42 47 18 46 01 J2007+4029 23 15 53 10.6 325.7 3.1 0.0 -30 288 No stop 18 47 46 =2005+403 23 17 39 10.3 325.4 3.2 0.0 75 291 18 46 02 18 47 46 G78.12 23 17 39 10.6 326.9 3.0 0.0 -30 291 No stop 18 51 01 --- 23 20 54 10.2 326.4 3.1 0.0 165 298 18 47 47 18 51 41 J2007+4029 23 21 34 9.8 324.9 3.2 0.0 10 298 18 51 41 18 53 26 =2005+403 23 23 20 9.6 324.6 3.2 0.0 105 301 18 51 42 18 53 26 G78.12 23 23 20 9.9 326.1 3.1 0.0 -30 301 No stop 18 56 41 --- 23 26 35 9.5 325.6 3.2 0.0 165 307 18 53 27 21 26 00 3C454.3 01 56 19 29.0 308.7 3.0 0.0 8853 307 21 26 00 21 30 00 --- 02 00 20 28.3 307.9 3.1 0.0 240 315 21 26 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess319.M256 Matching groups in /home/guest/rmc/SCHED/sched11.5/catalogs/freq_RDBE.dat: hh5cm Values confirmed by E-mail Jonathan Quick 20170808 (CR) ****** Only 30.51 of 64.00 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: 256 Format: VDIF Bits per sample: 2 Sample rate: 8.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 6510.00 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: 9 Based on FREQ, BW, and/or DOPPLER in schedule. Used with PCAL = off **** Warning Only 22.49 MHz of 64.00 MHz in scheduled channels is within IFs. LO sum= 6663.51 6663.51 6663.51 6663.51 6671.51 6671.51 6671.51 6671.51 6679.51 6679.51 6679.51 6679.51 6687.52 6687.52 6687.52 6687.52 BBC fr= 153.51 153.51 153.51 153.51 161.51 161.51 161.51 161.51 169.51 169.51 169.51 169.51 177.52 177.52 177.52 177.52 Bandwd= 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 Matching frequency sets: 9 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) * G78.12 20 12 40.835053 * 20 14 25.880000 20 15 06.582537 0.00 41 04 25.43758 * 41 13 36.87000 41 17 32.34509 0.00 From catalog imbedded in main SCHED input file. Doppler based on other sources. * G90.92 21 07 32.848262 * 21 09 12.600000 21 09 51.748169 0.00 49 48 48.99089 * 50 01 02.90000 50 06 10.18851 0.00 From catalog imbedded in main SCHED input file. Doppler based on other sources. * J2114+4953 21 12 33.765191 * 21 14 15.037600 21 14 54.827955 0.00 49 41 12.26070 * 49 53 40.95500 49 58 53.90362 0.00 From catalog imbedded in main SCHED input file. Doppler based on other sources. * G94.60 21 38 10.604900 * 21 39 58.260000 21 40 40.799481 0.00 50 00 42.49129 * 50 14 20.90000 50 20 00.46620 0.00 From catalog imbedded in main SCHED input file. Doppler based on LSR frame and radio definition. Velocities: -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 -41.00 * 3C345 16 41 17.606229 * 16 42 58.809967 16 43 36.690722 0.79 J1642+3948 39 54 10.81492 * 39 48 36.99399 39 46 41.67526 0.59 1641+399 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc J1642+39 GSFC 2016a X/S astro solution, 53724 observations. Doppler based on other sources. 2005+403 20 05 59.558887 * 20 07 44.944837 20 08 25.728073 0.35 * J2007+4029 40 21 01.80218 * 40 29 48.60403 40 33 34.36717 0.27 J2007+40 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 152 observations. Doppler based on other sources. 2135+508 21 35 15.499547 * 21 37 00.986187 21 37 42.661110 0.13 * J2137+5101 50 48 05.19450 * 51 01 36.12920 51 07 12.94556 0.07 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 145 observations. Doppler based on other sources. * 3C454.3 22 51 29.519739 * 22 53 57.747939 22 54 56.231324 0.65 J2253+1608 15 52 54.34808 * 16 08 53.56091 16 15 19.04835 0.73 2251+158 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc J2253+16 GSFC 2016a X/S astro solution, 41272 observations. Doppler based on other sources. 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 G78.12 sess319.M256 1 2 3 4 5 6 7 9 10 11 2.275 89.876 G90.92 sess319.M256 1 2 3 4 5 6 7 10 11 1.571 59.159 J2114+4953 sess319.M256 1 2 3 4 5 6 7 10 11 1.056 40.266 G94.60 sess319.M256 1 2 3 4 5 6 7 10 11 1.408 51.749 3C345 sess319.M256 1 2 3 4 5 6 7 9 10 11 0.117 6.384 J2007+4029 sess319.M256 1 2 3 4 5 6 7 9 10 11 1.429 57.687 J2137+5101 sess319.M256 1 2 3 4 5 6 7 10 11 0.875 32.198 3C454.3 sess319.M256 1 2 3 4 5 6 7 9 10 0.067 2.789 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) G78.12 97.9 G90.92 108.4 J2114+4953 109.2 G94.60 113.3 3C345 63.2 J2007+4029 96.6 J2137+5101 112.8 3C454.3 130.0 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