COVER INFORMATION Station: URUMQI (Code Ur ) Experiment: Network Monitoring Experiment Exp. Code: N13K3 Schedule Version: 1.00 Processed by SCHED version: 10.20 Release of about July 12, 2012 PI: Ivan Agudo Address: JIVE Postbus 2 7990 AA Dwingeloo The Netherlands Phone: +31-521-596549 EMAIL: agudo@jive.nl Fax: Phone during observation: +31-521-596549 Observing mode: Notes: 1.3 cm NME for session 3/2013 1 Gbps, 2-bit sampling, 16 MHz filters Send the disk pack by express to JIVE Additional DBBC testing data from Mc and Tr is expected. COVER LETTER: Dear EVN friends, This is the schedule for the 1.3cm NME on Oct. 17 2013, involving 17 stations: Eb Jb2 On20 Mc Nt Tr Ys Mh Sv Zc Bd Ur Sh Hh Ky Ku Kt The NME uses a setup with 1 Gbps and consists of integrations on strong calibrators (OJ287, 4C39.25, 0836+710, with ~5, ~8, and ~2.3 Jy at 15GHz as reported by the MOJAVE Team) as well as phase-referencing cycles involving 4C39.25 and a continuum calibrator (J0916+3854) as targets. There are three ftp fringe-test scans starting at: (1) 03:35:40 UT (scan 2, 2 sec, OJ287) (2) 03:59:40 UT (scan 6, 2 sec, 4C39.25) (3) 05:52:50 UT (scan 65, 2 sec, 4C39.25) See you on Skype group chat and Good luck with the session! Ivan Skype account: ivan-agudo Schedule for URUMQI (Code Ur ) Page 2 Network Monitoring Experiment 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 17 Oct 2013 Day 290 --- Next scan frequencies: 22187.49 22187.49 22187.49 22187.49 22219.49 22219.49 22219.49 22219.49 22251.49 22251.49 22251.49 22251.49 22283.49 22283.49 22283.49 22283.49 Next BBC frequencies: 187.49 187.49 187.49 187.49 219.49 219.49 219.49 219.49 251.49 251.49 251.49 251.49 283.49 283.49 283.49 283.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 03 30 00 OJ287 11 01 55 54.8 238.5 2.1 41.2 0 0 03 30 00 03 35 00 --- 11 06 56 54.0 240.0 2.2 42.0 300 39 03 30 04 03 35 40 OJ287 11 07 36 53.9 240.2 2.2 42.1 38 39 03 35 40 03 40 40 --- 11 12 37 53.1 241.6 2.3 42.8 300 77 03 35 44 03 42 40 OJ287 11 14 38 52.8 242.2 2.3 43.1 118 77 03 42 40 03 47 40 --- 11 19 38 51.9 243.6 2.4 43.8 300 116 03 42 44 03 48 20 OJ287 11 20 18 51.8 243.8 2.4 43.9 38 116 03 48 20 03 53 20 --- 11 25 19 51.0 245.2 2.5 44.5 300 155 03 48 24 03 54 00 4C39.25 11 25 59 67.5 268.7 2.0 68.9 4 155 03 54 00 03 59 00 --- 11 31 00 66.6 269.6 2.1 69.0 300 194 03 54 04 03 59 40 4C39.25 11 31 40 66.4 269.7 2.1 69.0 38 194 03 59 40 04 04 40 --- 11 36 41 65.5 270.5 2.1 69.0 300 232 03 59 44 04 06 40 4C39.25 11 38 41 65.2 270.9 2.2 69.0 118 232 04 06 40 04 07 40 --- 11 39 42 65.0 271.0 2.2 69.0 60 240 04 06 44 04 08 20 J0916+3854 11 40 22 63.0 272.5 2.4 68.6 33 240 04 08 20 04 09 20 =0913+391 11 41 22 62.8 272.7 2.4 68.6 60 248 04 08 24 04 10 10 4C39.25 11 42 12 64.5 271.4 2.2 68.9 43 248 04 10 10 04 11 10 --- 11 43 12 64.3 271.6 2.3 68.9 60 255 04 10 14 04 12 00 J0916+3854 11 44 02 62.3 273.1 2.4 68.5 43 255 04 12 00 04 13 00 =0913+391 11 45 03 62.1 273.2 2.5 68.5 60 263 04 12 04 04 13 50 4C39.25 11 45 53 63.9 272.0 2.3 68.9 43 263 04 13 50 04 14 50 --- 11 46 53 63.7 272.2 2.3 68.9 60 271 04 13 54 04 15 40 J0916+3854 11 47 43 61.6 273.6 2.5 68.4 43 271 04 15 40 04 16 40 =0913+391 11 48 43 61.4 273.8 2.5 68.4 60 279 04 15 44 04 17 30 4C39.25 11 49 33 63.2 272.6 2.4 68.8 43 279 04 17 30 04 18 30 --- 11 50 33 63.0 272.8 2.4 68.8 60 286 04 17 34 Schedule for URUMQI (Code Ur ) Page 3 Network Monitoring Experiment 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 17 Oct 2013 Day 290 --- 04 19 20 J0916+3854 11 51 24 61.0 274.2 2.6 68.3 43 286 04 19 20 04 20 20 =0913+391 11 52 24 60.8 274.3 2.6 68.3 60 294 04 19 24 04 21 10 4C39.25 11 53 14 62.5 273.2 2.4 68.8 43 294 04 21 10 04 22 10 --- 11 54 14 62.3 273.3 2.4 68.7 60 302 04 21 14 04 23 00 J0916+3854 11 55 04 60.3 274.7 2.6 68.2 43 302 04 23 00 04 24 00 =0913+391 11 56 04 60.1 274.9 2.6 68.2 60 310 04 23 04 04 24 50 4C39.25 11 56 54 61.9 273.7 2.5 68.7 43 310 04 24 50 04 25 50 --- 11 57 55 61.7 273.9 2.5 68.6 60 317 04 24 54 04 26 40 J0916+3854 11 58 45 59.6 275.3 2.7 68.1 43 317 04 26 40 04 27 40 =0913+391 11 59 45 59.5 275.4 2.7 68.1 60 325 04 26 44 04 28 30 4C39.25 12 00 35 61.2 274.3 2.5 68.6 43 325 04 28 30 04 29 30 --- 12 01 35 61.0 274.4 2.6 68.5 60 333 04 28 34 04 30 20 J0916+3854 12 02 25 59.0 275.8 2.7 68.0 43 333 04 30 20 04 31 20 =0913+391 12 03 26 58.8 275.9 2.8 67.9 60 341 04 30 24 04 32 10 4C39.25 12 04 16 60.5 274.8 2.6 68.5 43 341 04 32 10 04 33 10 --- 12 05 16 60.4 275.0 2.6 68.4 60 348 04 32 14 04 34 00 J0916+3854 12 06 06 58.3 276.3 2.8 67.8 43 348 04 34 00 04 35 00 =0913+391 12 07 06 58.1 276.4 2.8 67.8 60 356 04 34 04 04 35 50 4C39.25 12 07 56 59.9 275.3 2.7 68.3 43 356 04 35 50 04 36 50 --- 12 08 56 59.7 275.5 2.7 68.3 60 364 04 35 54 04 37 40 J0916+3854 12 09 47 57.6 276.8 2.9 67.7 43 364 04 37 40 04 38 40 =0913+391 12 10 47 57.5 276.9 2.9 67.7 60 372 04 37 44 04 39 30 4C39.25 12 11 37 59.2 275.9 2.7 68.2 43 372 04 39 30 04 40 30 --- 12 12 37 59.0 276.0 2.7 68.2 60 379 04 39 34 04 41 20 J0916+3854 12 13 27 57.0 277.3 2.9 67.6 43 379 04 41 20 04 42 20 =0913+391 12 14 27 56.8 277.5 2.9 67.5 60 387 04 41 24 04 43 10 4C39.25 12 15 17 58.5 276.4 2.8 68.1 43 387 04 43 10 04 44 10 --- 12 16 18 58.4 276.5 2.8 68.0 60 395 04 43 14 04 45 00 J0916+3854 12 17 08 56.3 277.8 3.0 67.4 43 395 04 45 00 04 46 00 =0913+391 12 18 08 56.1 277.9 3.0 67.3 60 403 04 45 04 Schedule for URUMQI (Code Ur ) Page 4 Network Monitoring Experiment 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 17 Oct 2013 Day 290 --- 04 46 50 4C39.25 12 18 58 57.9 276.9 2.9 67.9 43 403 04 46 50 04 47 50 --- 12 19 58 57.7 277.0 2.9 67.9 60 410 04 46 54 04 48 40 J0916+3854 12 20 48 55.7 278.3 3.1 67.2 43 410 04 48 40 04 49 40 =0913+391 12 21 49 55.5 278.4 3.1 67.2 60 418 04 48 44 04 50 30 4C39.25 12 22 39 57.2 277.4 2.9 67.8 43 418 04 50 30 04 51 30 --- 12 23 39 57.0 277.5 2.9 67.7 60 426 04 50 34 04 52 20 J0916+3854 12 24 29 55.0 278.8 3.1 67.0 43 426 04 52 20 04 53 20 =0913+391 12 25 29 54.8 278.9 3.1 67.0 60 434 04 52 24 04 54 10 4C39.25 12 26 19 56.6 277.9 3.0 67.6 43 434 04 54 10 04 55 10 --- 12 27 19 56.4 278.0 3.0 67.6 60 441 04 54 14 04 56 00 J0916+3854 12 28 10 54.3 279.3 3.2 66.9 43 441 04 56 00 04 57 00 =0913+391 12 29 10 54.2 279.4 3.2 66.8 60 449 04 56 04 04 57 50 4C39.25 12 30 00 55.9 278.4 3.0 67.4 43 449 04 57 50 04 58 50 --- 12 31 00 55.7 278.5 3.1 67.4 60 457 04 57 54 04 59 40 J0916+3854 12 31 50 53.7 279.8 3.2 66.7 43 457 04 59 40 05 00 40 =0913+391 12 32 50 53.5 279.9 3.3 66.6 60 464 04 59 44 05 01 30 4C39.25 12 33 40 55.2 278.9 3.1 67.3 43 464 05 01 30 05 02 30 --- 12 34 41 55.1 279.0 3.1 67.2 60 472 05 01 34 05 03 20 J0916+3854 12 35 31 53.0 280.2 3.3 66.5 43 472 05 03 20 05 04 20 =0913+391 12 36 31 52.8 280.4 3.3 66.4 60 480 05 03 24 05 05 10 4C39.25 12 37 21 54.6 279.4 3.2 67.1 43 480 05 05 10 05 06 10 --- 12 38 21 54.4 279.5 3.2 67.0 60 488 05 05 14 05 07 00 J0916+3854 12 39 11 52.4 280.7 3.4 66.3 43 488 05 07 00 05 08 00 =0913+391 12 40 12 52.2 280.8 3.4 66.2 60 495 05 07 04 05 08 50 4C39.25 12 41 02 53.9 279.8 3.2 66.9 43 495 05 08 50 05 09 50 --- 12 42 02 53.7 280.0 3.2 66.8 60 503 05 08 54 05 10 40 J0916+3854 12 42 52 51.7 281.2 3.4 66.1 43 503 05 10 40 05 11 40 =0913+391 12 43 52 51.5 281.3 3.4 66.0 60 511 05 10 44 05 12 30 4C39.25 12 44 42 53.3 280.3 3.3 66.7 43 511 05 12 30 05 13 30 --- 12 45 42 53.1 280.4 3.3 66.6 60 519 05 12 34 Schedule for URUMQI (Code Ur ) Page 5 Network Monitoring Experiment 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 17 Oct 2013 Day 290 --- 05 14 20 J0916+3854 12 46 33 51.1 281.6 3.5 65.9 43 519 05 14 20 05 15 20 =0913+391 12 47 33 50.9 281.8 3.5 65.8 60 526 05 14 24 05 16 10 4C39.25 12 48 23 52.6 280.8 3.3 66.5 43 526 05 16 10 05 17 10 --- 12 49 23 52.4 280.9 3.4 66.4 60 534 05 16 14 05 18 00 J0916+3854 12 50 13 50.4 282.1 3.5 65.7 43 534 05 18 00 05 19 00 =0913+391 12 51 13 50.2 282.2 3.6 65.6 60 542 05 18 04 05 19 50 4C39.25 12 52 04 52.0 281.2 3.4 66.3 43 542 05 19 50 05 20 50 --- 12 53 04 51.8 281.4 3.4 66.2 60 550 05 19 54 05 21 40 J0916+3854 12 53 54 49.8 282.6 3.6 65.4 43 550 05 21 40 05 22 40 =0913+391 12 54 54 49.6 282.7 3.6 65.4 60 557 05 21 44 05 23 30 4C39.25 12 55 44 51.3 281.7 3.5 66.1 43 557 05 23 30 05 24 30 --- 12 56 44 51.1 281.8 3.5 66.0 60 565 05 23 34 05 25 20 J0916+3854 12 57 34 49.1 283.0 3.7 65.2 43 565 05 25 20 05 26 20 =0913+391 12 58 35 48.9 283.2 3.7 65.1 60 573 05 25 24 05 27 10 4C39.25 12 59 25 50.6 282.2 3.5 65.9 43 573 05 27 10 05 28 10 --- 13 00 25 50.5 282.3 3.5 65.8 60 581 05 27 14 05 29 00 J0916+3854 13 01 15 48.5 283.5 3.7 65.0 43 581 05 29 00 05 30 00 =0913+391 13 02 15 48.3 283.6 3.7 64.9 60 588 05 29 04 05 30 50 4C39.25 13 03 05 50.0 282.6 3.6 65.6 43 588 05 30 50 05 31 50 --- 13 04 05 49.8 282.8 3.6 65.6 60 596 05 30 54 05 32 40 J0916+3854 13 04 56 47.8 283.9 3.8 64.7 43 596 05 32 40 05 33 40 =0913+391 13 05 56 47.6 284.1 3.8 64.7 60 604 05 32 44 05 34 30 4C39.25 13 06 46 49.3 283.1 3.6 65.4 43 604 05 34 30 05 35 30 --- 13 07 46 49.2 283.2 3.7 65.3 60 612 05 34 34 05 36 20 J0916+3854 13 08 36 47.2 284.4 3.8 64.5 43 612 05 36 20 05 37 20 =0913+391 13 09 36 47.0 284.5 3.9 64.4 60 619 05 36 24 05 38 10 4C39.25 13 10 27 48.7 283.5 3.7 65.2 43 619 05 38 10 05 39 10 --- 13 11 27 48.5 283.7 3.7 65.1 60 627 05 38 14 05 40 00 J0916+3854 13 12 17 46.5 284.9 3.9 64.2 43 627 05 40 00 05 41 00 =0913+391 13 13 17 46.3 285.0 3.9 64.2 60 635 05 40 04 Schedule for URUMQI (Code Ur ) Page 6 Network Monitoring Experiment 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 17 Oct 2013 Day 290 --- 05 41 50 4C39.25 13 14 07 48.0 284.0 3.8 64.9 43 635 05 41 50 05 42 50 --- 13 15 07 47.9 284.1 3.8 64.9 60 643 05 41 54 05 43 40 J0916+3854 13 15 57 45.9 285.3 4.0 64.0 43 643 05 43 40 05 44 40 =0913+391 13 16 58 45.7 285.4 4.0 63.9 60 650 05 43 44 05 45 30 4C39.25 13 17 48 47.4 284.4 3.8 64.7 43 650 05 45 30 05 46 30 --- 13 18 48 47.2 284.6 3.8 64.6 60 658 05 45 34 05 47 20 J0916+3854 13 19 38 45.2 285.8 4.0 63.7 43 658 05 47 20 05 48 20 =0913+391 13 20 38 45.1 285.9 4.0 63.7 60 666 05 47 24 05 49 10 4C39.25 13 21 28 46.8 284.9 3.9 64.4 43 666 05 49 10 05 50 10 --- 13 22 28 46.6 285.0 3.9 64.4 60 674 05 49 14 05 51 00 J0916+3854 13 23 19 44.6 286.2 4.1 63.5 43 674 05 51 00 05 52 00 =0913+391 13 24 19 44.4 286.3 4.1 63.4 60 681 05 51 04 05 52 50 4C39.25 13 25 09 46.1 285.3 4.0 64.2 43 681 05 52 50 05 57 50 --- 13 30 10 45.2 286.0 4.0 63.8 300 720 05 52 54 05 59 50 0836+710 13 32 10 46.2 333.1 4.8 88.5 69 720 05 59 50 06 04 50 --- 13 37 11 45.8 333.1 4.9 87.3 300 759 05 59 54 06 05 30 0836+710 13 37 51 45.8 333.1 4.9 87.2 38 759 06 05 30 06 10 30 --- 13 42 52 45.4 333.2 5.0 86.0 300 797 06 05 34 06 11 10 0836+710 13 43 32 45.3 333.2 5.0 85.9 38 797 06 11 10 06 16 10 --- 13 48 33 44.9 333.2 5.1 84.7 300 836 06 11 14 06 16 50 0836+710 13 49 13 44.8 333.2 5.1 84.6 38 836 06 16 50 06 21 50 --- 13 54 14 44.4 333.3 5.2 83.4 300 875 06 16 54 06 22 30 0836+710 13 54 54 44.4 333.3 5.2 83.3 38 875 06 22 30 06 30 00 --- 14 02 25 43.8 333.4 5.3 81.6 450 933 06 22 34 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess313.K1024 Matching groups in /aps3/sched10.2/catalogs/freq.dat: ur1cmd Dummy dual-pol entry, only LCP available (CR 2Jul02). Setup group: 5 Station: URUMQI Total bit rate: 1024 Format: MARK5B Bits per sample: 2 Sample rate: 32.000 Number of channels: 16 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 22000.00 Net SB= L L U U L L U U L L U U L L U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 2 1 2 1 4 3 4 3 6 5 6 5 8 7 8 7 BBC SB= L L U U L L U U L L U U L L U U IF = 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N 2N 1N The following frequency sets based on these setups were used. Frequency Set: 12 Setup file default. LO sum= 22187.49 22187.49 22187.49 22187.49 22219.49 22219.49 22219.49 22219.49 22251.49 22251.49 22251.49 22251.49 22283.49 22283.49 22283.49 22283.49 BBC fr= 187.49 187.49 187.49 187.49 219.49 219.49 219.49 219.49 251.49 251.49 251.49 251.49 283.49 283.49 283.49 283.49 Bandwd= 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 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, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 barrel=roll_off SOURCES USED IN RECORDING SCANS -- Network Monitoring Experiment Catalog positions marked with *. Precession of date coordinates is based on stop time of first scan. Names used in schedule marked with *. Short names used in VLA and SNAP files marked with +. Observation date used in B1950/J2000 coordinate conversion (PRECDATE): 1979.900 No adjustments are made for rates (DRA, DDEC). Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) J0841+7053 08 36 21.556645 * 08 41 24.365283 08 42 46.538282 0.31 * 0836+710 71 04 22.42740 * 70 53 42.17302 70 50 19.75249 0.10 J0841+70 /aps3/sched10.2/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 4322 observations 0.458 scan and 64.816 baseline hours in setup: sess313.K1024 Frequency sets (dups not shown): 1 2 3 4 5 6 7 8 9 10 12 13 15 18 19 J0854+2006 08 51 57.250618 * 08 54 48.874930 08 55 36.298664 0.11 0851+202 20 17 58.41733 * 20 06 30.64078 20 03 12.42132 0.10 J0854+20 /aps3/sched10.2/catalogs/sources.vlba * OJ287 rfc_2012b Petrov, 2012, unpublished 191510 observations 0.333 scan and 57.000 baseline hours in setup: sess313.K1024 Frequency sets (dups not shown): 1 2 3 4 5 6 7 8 9 10 12 13 14 15 18 19 * J0916+3854 09 13 39.517576 * 09 16 48.904600 09 17 40.826977 0.20 0913+391 39 07 02.11851 * 38 54 28.14666 38 50 45.86659 0.23 J0916+38 /aps3/sched10.2/catalogs/sources.vlba rfc_2012b Petrov, 2012, unpublished 84 observations 0.483 scan and 75.450 baseline hours in setup: sess313.K1024 Frequency sets (dups not shown): 1 2 3 4 5 6 7 8 9 10 12 13 14 15 18 19 J0927+3902 09 23 55.319217 * 09 27 03.013938 09 27 54.380190 0.13 0923+392 39 15 23.56637 * 39 02 20.85177 38 58 31.03918 0.10 * 4C39.25 /aps3/sched10.2/catalogs/sources.vlba J0927+39 rfc_2012b Petrov, 2012, unpublished 239566 observations 0.733 scan and 116.677 baseline hours in setup: sess313.K1024 Frequency sets (dups not shown): 1 2 3 4 5 6 7 8 9 10 12 13 14 15 18 19 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) 0836+710 92.9 OJ287 73.3 J0916+3854 75.5 4C39.25 73.8 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