COVER INFORMATION Station: SHANGHAI (Code Sh ) Experiment: K band NME+FTP-FT Experiment N12K3 Exp. Code: N12K3 Schedule Version: 1.00 Processed by SCHED version: 10.00 Release Sept. 15, 2011 PI: Jun YANG Address: JIVE, The Netherlands Phone: +31 521 596 507 EMAIL: yang@jive.nl Fax: Phone during observation: Observing mode: 512-16-2 Notes: 512 Mbps, 16 x 8 MHz, 2 bit sampling Check antenna pointing, Please Three FTP-FT scans scheduled. Skype group chat will be iniated Schedule for SHANGHAI (Code Sh ) Page 2 K band NME+FTP-FT Experiment N12K3 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 ---------------------------------------------------------------------------------------- --- Wed 6 Jun 2012 Day 158 --- Next scan frequencies: 22211.49 22211.49 22211.49 22211.49 22227.49 22227.49 22227.49 22227.49 22243.49 22243.49 22243.49 22243.49 22259.49 22259.49 22259.49 22259.49 Next BBC frequencies: 611.49 611.49 611.49 611.49 627.49 627.49 627.49 627.49 643.49 643.49 643.49 643.49 659.49 659.49 659.49 659.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 12 30 00 4C39.25 13 36 05 39.6 -63.0 4.1 78.8 0 0 12 30 00 12 38 00 --- 13 44 06 38.0 -62.5 4.3 77.8 480 31 12 30 01 12 40 00 4C39.25 13 46 06 37.6 -62.4 4.3 77.6 118 31 12 40 00 12 48 00 --- 13 54 08 36.1 -62.0 4.4 76.6 480 62 12 40 01 12 50 00 4C39.25 13 56 08 35.7 -61.9 4.5 76.3 118 62 12 50 00 12 58 00 --- 14 04 09 34.2 -61.4 4.6 75.3 480 93 12 50 01 13 00 00 4C39.25 14 06 10 33.9 -61.3 4.6 75.1 118 93 13 00 00 13 08 00 --- 14 14 11 32.4 -60.8 4.8 74.1 480 124 13 00 01 13 10 00 4C39.25 14 16 11 32.0 -60.7 4.8 73.9 118 124 13 10 00 13 18 00 --- 14 24 13 30.5 -60.2 4.9 72.9 480 155 13 10 01 13 20 00 4C39.25 14 26 13 30.1 -60.0 5.0 72.6 118 155 13 20 00 13 28 00 --- 14 34 14 28.6 -59.5 5.1 71.6 480 186 13 20 01 13 30 50 4C39.25 14 37 05 28.1 -59.3 5.2 71.3 168 186 13 30 50 13 32 00 --- 14 38 15 27.9 -59.2 5.2 71.1 70 190 13 30 51 13 32 20 4C39.25 14 38 35 27.8 -59.2 5.2 71.1 18 190 13 32 20 13 33 30 --- 14 39 45 27.6 -59.1 5.2 70.9 70 195 13 32 21 13 33 50 J0923+3849 14 40 05 26.8 -59.0 5.3 70.3 15 195 13 33 50 13 35 00 =0920+390 14 41 15 26.6 -58.9 5.3 70.2 70 199 13 33 51 13 35 20 4C39.25 14 41 35 27.3 -59.0 5.2 70.7 15 199 13 35 20 13 36 30 --- 14 42 46 27.1 -58.9 5.2 70.6 70 204 13 35 21 13 36 50 J0923+3849 14 43 06 26.2 -58.8 5.3 70.0 15 204 13 36 50 13 38 00 =0920+390 14 44 16 26.0 -58.7 5.3 69.8 70 208 13 36 51 Schedule for SHANGHAI (Code Sh ) Page 3 K band NME+FTP-FT Experiment N12K3 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 ---------------------------------------------------------------------------------------- --- Wed 6 Jun 2012 Day 158 --- 13 38 20 4C39.25 14 44 36 26.7 -58.7 5.3 70.3 15 208 13 38 20 13 39 30 --- 14 45 46 26.5 -58.7 5.3 70.2 70 213 13 38 21 13 39 50 J0923+3849 14 46 06 25.7 -58.6 5.4 69.6 15 213 13 39 50 13 41 00 =0920+390 14 47 16 25.5 -58.5 5.4 69.4 70 217 13 39 51 13 41 20 4C39.25 14 47 36 26.2 -58.5 5.3 70.0 15 217 13 41 20 13 42 30 --- 14 48 47 26.0 -58.4 5.3 69.8 70 222 13 41 21 13 42 50 J0923+3849 14 49 07 25.1 -58.3 5.4 69.2 15 222 13 42 50 13 44 00 =0920+390 14 50 17 24.9 -58.3 5.4 69.1 70 226 13 42 51 13 44 20 4C39.25 14 50 37 25.6 -58.3 5.4 69.6 15 226 13 44 20 13 45 30 --- 14 51 47 25.4 -58.2 5.4 69.4 70 231 13 44 21 13 45 50 J0923+3849 14 52 07 24.6 -58.1 5.5 68.8 15 231 13 45 50 13 47 00 =0920+390 14 53 17 24.4 -58.0 5.5 68.7 70 235 13 45 51 13 47 20 4C39.25 14 53 37 25.1 -58.1 5.4 69.2 15 235 13 47 20 13 48 30 --- 14 54 48 24.9 -58.0 5.4 69.1 70 240 13 47 21 13 48 50 J0923+3849 14 55 08 24.0 -57.9 5.5 68.5 15 240 13 48 50 13 50 00 =0920+390 14 56 18 23.8 -57.8 5.5 68.3 70 245 13 48 51 13 50 20 4C39.25 14 56 38 24.5 -57.8 5.5 68.8 15 245 13 50 20 13 51 30 --- 14 57 48 24.3 -57.7 5.5 68.7 70 249 13 50 21 13 51 50 J0923+3849 14 58 08 23.5 -57.6 5.6 68.1 15 249 13 51 50 13 53 00 =0920+390 14 59 18 23.3 -57.5 5.6 67.9 70 254 13 51 51 13 53 20 4C39.25 14 59 38 24.0 -57.6 5.5 68.5 15 254 13 53 20 13 54 30 --- 15 00 49 23.8 -57.5 5.5 68.3 70 258 13 53 21 13 54 50 J0923+3849 15 01 09 23.0 -57.4 5.6 67.7 15 258 13 54 50 13 56 00 =0920+390 15 02 19 22.7 -57.3 5.6 67.6 70 263 13 54 51 13 56 20 4C39.25 15 02 39 23.4 -57.4 5.6 68.1 15 263 13 56 20 13 57 30 --- 15 03 49 23.2 -57.3 5.6 67.9 70 267 13 56 21 13 57 50 J0923+3849 15 04 09 22.4 -57.2 5.7 67.3 15 267 13 57 50 13 59 00 =0920+390 15 05 19 22.2 -57.1 5.7 67.2 70 272 13 57 51 13 59 20 4C39.25 15 05 39 22.9 -57.1 5.6 67.7 15 272 13 59 20 14 00 30 --- 15 06 50 22.7 -57.0 5.6 67.6 70 276 13 59 21 Schedule for SHANGHAI (Code Sh ) Page 4 K band NME+FTP-FT Experiment N12K3 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 ---------------------------------------------------------------------------------------- --- Wed 6 Jun 2012 Day 158 --- 14 00 50 J0923+3849 15 07 10 21.9 -56.9 5.7 67.0 15 276 14 00 50 14 02 00 =0920+390 15 08 20 21.7 -56.8 5.7 66.8 70 281 14 00 51 14 02 20 4C39.25 15 08 40 22.4 -56.9 5.7 67.3 15 281 14 02 20 14 03 30 --- 15 09 50 22.2 -56.8 5.7 67.2 70 285 14 02 21 14 03 50 J0923+3849 15 10 10 21.3 -56.7 5.8 66.6 15 285 14 03 50 14 05 00 =0920+390 15 11 20 21.1 -56.6 5.8 66.4 70 290 14 03 51 14 05 20 4C39.25 15 11 40 21.8 -56.6 5.7 66.9 15 290 14 05 20 14 06 30 --- 15 12 51 21.6 -56.5 5.8 66.8 70 294 14 05 21 14 06 50 J0923+3849 15 13 11 20.8 -56.4 5.8 66.2 15 294 14 06 50 14 08 00 =0920+390 15 14 21 20.6 -56.3 5.8 66.0 70 299 14 06 51 14 08 20 4C39.25 15 14 41 21.3 -56.4 5.8 66.6 15 299 14 08 20 14 09 30 --- 15 15 51 21.1 -56.3 5.8 66.4 70 303 14 08 21 14 09 50 J0923+3849 15 16 11 20.3 -56.2 5.9 65.8 15 303 14 09 50 14 11 00 =0920+390 15 17 21 20.1 -56.1 5.9 65.7 70 308 14 09 51 14 11 20 4C39.25 15 17 41 20.8 -56.1 5.8 66.2 15 308 14 11 20 14 12 30 --- 15 18 52 20.5 -56.0 5.9 66.0 70 312 14 11 21 14 12 50 J0923+3849 15 19 12 19.7 -55.9 5.9 65.4 15 312 14 12 50 14 14 00 =0920+390 15 20 22 19.5 -55.8 5.9 65.3 70 317 14 12 51 14 14 20 4C39.25 15 20 42 20.2 -55.9 5.9 65.8 15 317 14 14 20 14 15 30 --- 15 21 52 20.0 -55.8 5.9 65.6 70 321 14 14 21 14 15 50 J0923+3849 15 22 12 19.2 -55.6 6.0 65.0 15 321 14 15 50 14 17 00 =0920+390 15 23 22 19.0 -55.5 6.0 64.9 70 326 14 15 51 14 17 20 4C39.25 15 23 42 19.7 -55.6 5.9 65.4 15 326 14 17 20 14 18 30 --- 15 24 53 19.5 -55.5 6.0 65.3 70 330 14 17 21 14 18 50 J0923+3849 15 25 13 18.7 -55.4 6.0 64.7 15 330 14 18 50 14 20 00 =0920+390 15 26 23 18.5 -55.3 6.0 64.5 70 335 14 18 51 14 20 20 4C39.25 15 26 43 19.2 -55.4 6.0 65.0 15 335 14 20 20 14 21 30 --- 15 27 53 19.0 -55.3 6.0 64.9 70 339 14 20 21 14 21 50 J0923+3849 15 28 13 18.1 -55.1 6.1 64.3 15 339 14 21 50 14 23 00 =0920+390 15 29 23 17.9 -55.0 6.1 64.1 70 344 14 21 51 Schedule for SHANGHAI (Code Sh ) Page 5 K band NME+FTP-FT Experiment N12K3 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 ---------------------------------------------------------------------------------------- --- Wed 6 Jun 2012 Day 158 --- 14 23 20 4C39.25 15 29 43 18.6 -55.1 6.0 64.6 15 344 14 23 20 14 24 30 --- 15 30 54 18.4 -55.0 6.1 64.5 70 348 14 23 21 14 24 50 J0923+3849 15 31 14 17.6 -54.8 6.1 63.9 15 348 14 24 50 14 26 00 =0920+390 15 32 24 17.4 -54.7 6.1 63.7 70 353 14 24 51 14 26 20 4C39.25 15 32 44 18.1 -54.8 6.1 64.2 15 353 14 26 20 14 27 30 --- 15 33 54 17.9 -54.7 6.1 64.1 70 357 14 26 21 14 27 50 J0923+3849 15 34 14 17.1 -54.6 6.2 63.5 15 357 14 27 50 14 29 00 =0920+390 15 35 24 16.9 -54.5 6.2 63.3 70 362 14 27 51 14 29 20 4C39.25 15 35 44 17.6 -54.6 6.1 63.9 15 362 14 29 20 14 30 30 --- 15 36 55 17.4 -54.5 6.2 63.7 70 366 14 29 21 14 30 50 J0923+3849 15 37 15 16.6 -54.3 6.2 63.1 15 366 14 30 50 14 32 00 =0920+390 15 38 25 16.4 -54.2 6.2 63.0 70 371 14 30 51 14 33 00 4C39.25 15 39 25 16.9 -54.2 6.2 63.4 55 371 14 33 00 14 41 00 --- 15 47 26 15.5 -53.5 6.3 62.3 480 402 14 33 01 14 43 50 4C39.25 15 50 17 15.1 -53.2 6.4 61.9 168 402 14 43 50 14 45 00 --- 15 51 27 14.9 -53.1 6.4 61.8 70 406 14 43 51 14 45 30 4C39.25 15 51 57 14.8 -53.1 6.4 61.7 28 406 14 45 30 14 46 30 --- 15 52 57 14.6 -53.0 6.4 61.6 60 410 14 45 31 14 47 00 J0923+3849 15 53 27 13.8 -52.8 6.5 61.0 25 410 14 47 00 14 48 00 =0920+390 15 54 27 13.6 -52.7 6.5 60.8 60 414 14 47 01 14 48 30 4C39.25 15 54 58 14.3 -52.8 6.5 61.3 25 414 14 48 30 14 49 30 --- 15 55 58 14.1 -52.7 6.5 61.2 60 418 14 48 31 14 50 00 J0923+3849 15 56 28 13.3 -52.5 6.5 60.6 25 418 14 50 00 14 51 00 =0920+390 15 57 28 13.1 -52.4 6.6 60.4 60 422 14 50 01 14 51 30 4C39.25 15 57 58 13.7 -52.5 6.5 60.9 25 422 14 51 30 14 52 30 --- 15 58 58 13.6 -52.4 6.5 60.8 60 426 14 51 31 14 53 00 J0923+3849 15 59 28 12.7 -52.2 6.6 60.2 25 426 14 53 00 14 54 00 =0920+390 16 00 28 12.6 -52.1 6.6 60.0 60 430 14 53 01 14 54 30 4C39.25 16 00 59 13.2 -52.2 6.6 60.5 25 430 14 54 30 14 55 30 --- 16 01 59 13.1 -52.1 6.6 60.4 60 434 14 54 31 Schedule for SHANGHAI (Code Sh ) Page 6 K band NME+FTP-FT Experiment N12K3 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 ---------------------------------------------------------------------------------------- --- Wed 6 Jun 2012 Day 158 --- 14 56 00 J0923+3849 16 02 29 12.2 -51.9 6.6 59.8 25 434 14 56 00 14 57 00 =0920+390 16 03 29 12.1 -51.8 6.7 59.6 60 437 14 56 01 14 57 30 4C39.25 16 03 59 12.7 -51.9 6.6 60.1 25 437 14 57 30 14 58 30 --- 16 04 59 12.6 -51.8 6.6 60.0 60 441 14 57 31 14 59 00 J0923+3849 16 05 29 11.7 -51.6 6.7 59.3 25 441 14 59 00 15 00 00 =0920+390 16 06 29 11.6 -51.5 6.7 59.2 60 445 14 59 01 15 00 30 4C39.25 16 06 59 12.2 -51.6 6.7 59.7 25 445 15 00 30 15 01 30 --- 16 08 00 12.1 -51.5 6.7 59.6 60 449 15 00 31 15 02 00 J0923+3849 16 08 30 11.2 -51.3 6.7 58.9 25 449 15 02 00 15 03 00 =0920+390 16 09 30 11.1 -51.1 6.8 58.8 60 453 15 02 01 15 03 30 4C39.25 16 10 00 11.7 -51.3 6.7 59.3 25 453 15 03 30 15 04 30 --- 16 11 00 11.6 -51.2 6.7 59.2 60 457 15 03 31 15 05 00 J0923+3849 16 11 30 10.7 -50.9 6.8 58.5 25 457 15 05 00 15 06 00 =0920+390 16 12 30 10.6 -50.8 6.8 58.4 60 461 15 05 01 15 06 30 4C39.25 16 13 00 11.2 -51.0 6.8 58.9 25 461 15 06 30 15 07 30 --- 16 14 01 11.1 -50.9 6.8 58.7 60 464 15 06 31 15 08 00 J0923+3849 16 14 31 10.2 -50.6 6.8 58.1 25 464 15 08 00 15 09 00 =0920+390 16 15 31 10.1 -50.5 6.9 58.0 60 468 15 08 01 15 09 30 4C39.25 16 16 01 10.7 -50.7 6.8 58.5 25 468 15 09 30 15 10 30 --- 16 17 01 10.6 -50.6 6.8 58.3 60 472 15 09 31 15 11 00 J0923+3849 16 17 31 9.7 -50.3 6.9 57.7 25 472 15 11 00 15 12 00 =0920+390 16 18 31 9.6 -50.2 6.9 57.6 60 476 15 11 01 15 12 30 4C39.25 16 19 01 10.2 -50.4 6.9 58.0 25 476 15 12 30 15 13 30 --- 16 20 02 10.1 -50.3 6.9 57.9 60 480 15 12 31 15 14 00 J0923+3849 16 20 32 9.2 -50.0 6.9 57.3 25 480 15 14 00 15 15 00 =0920+390 16 21 32 9.1 -49.9 7.0 57.1 60 484 15 14 01 15 17 00 3C273 16 23 32 27.8 254.2 3.9 55.5 -189 484 15 17 00 15 21 00 --- 16 27 33 26.9 254.9 4.0 55.8 51 499 15 17 01 15 21 30 3C273 16 28 03 26.8 254.9 4.0 55.8 28 499 15 21 30 15 25 30 --- 16 32 04 26.0 255.6 4.0 56.1 240 515 15 21 31 Schedule for SHANGHAI (Code Sh ) Page 7 K band NME+FTP-FT Experiment N12K3 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 ---------------------------------------------------------------------------------------- --- Wed 6 Jun 2012 Day 158 --- 15 26 00 3C273 16 32 34 25.9 255.6 4.0 56.1 28 515 15 26 00 15 30 00 --- 16 36 34 25.1 256.3 4.1 56.3 240 530 15 26 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: sess112.K512 Matching groups in /aps3/sched10.0/catalogs/freq.dat: sh1cm From Porcas, from Huang Xinyong 231198 Setup group: 5 Station: SHANGHAI Total bit rate: 512 Format: MARK5B Bits per sample: 2 Sample rate: 16.000 Number of channels: 16 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 21600.00 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 = 1 2 1 2 3 4 3 4 5 6 5 6 7 8 7 8 BBC SB= L L U U L L U U L L U U L L U U IF = C A C A C A C A C A C A C A C A The following frequency sets based on these setups were used. Frequency Set: 9 Setup file default. Used pcal sets: 1 LO sum= 22211.49 22211.49 22211.49 22211.49 22227.49 22227.49 22227.49 22227.49 22243.49 22243.49 22243.49 22243.49 22259.49 22259.49 22259.49 22259.49 BBC fr= 611.49 611.49 611.49 611.49 627.49 627.49 627.49 627.49 643.49 643.49 643.49 643.49 659.49 659.49 659.49 659.49 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 Matching frequency sets: 9 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S9 S11 S13 S15 PCALXB2= S2 S4 S6 S8 S10 S12 S14 S16 PCALFR1= 490 510 490 510 490 510 490 510 PCALFR2= 490 510 490 510 490 510 490 510 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 -- K band NME+FTP-FT Experiment N12K3 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) * J0923+3849 09 20 06.318431 * 09 23 14.452932 09 24 01.305827 0.02 0920+390 39 02 32.11186 * 38 49 39.91013 38 46 28.77887 0.02 J0923+38 /aps3/sched10.0/catalogs/sources.vlba GSFC 2010a astro solution 2209 Observations 0.556 scan and 26.391 baseline hours in setup: sess112.K512 Frequency sets (dups not shown): 1 2 3 4 5 6 8 9 10 11 J0927+3902 09 23 55.319213 * 09 27 03.013934 09 27 49.772830 0.29 0923+392 39 15 23.56646 * 39 02 20.85186 38 59 07.27819 0.16 * 4C39.25 /aps3/sched10.0/catalogs/sources.vlba J0927+39 GSFC 2010a astro solution 231732 Observations 1.528 scan and 74.138 baseline hours in setup: sess112.K512 Frequency sets (dups not shown): 1 2 3 4 5 6 8 9 10 11 J1229+0203 12 26 33.245835 * 12 29 06.699731 12 29 46.245254 1.04 * 3C273 02 19 43.30577 * 02 03 08.59827 01 58 54.72049 1.33 3C273B /aps3/sched10.0/catalogs/sources.vlba 1226+023 GSFC 2010a astro solution 32199 Observations J1229+02 0.200 scan and 9.961 baseline hours in setup: sess112.K512 Frequency sets (dups not shown): 1 2 3 4 5 6 8 9 10 11 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) J0923+3849 57.6 4C39.25 58.4 3C273 109.7 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