COVER INFORMATION Station: VLBA_BR (Code Br ) Experiment: bw082 M87 movie pilot. Walker, Ly, Junor, Hardee Exp. Code: bw082c Schedule Version: 1.00 Processed by SCHED version: 6.04 March 2006 PI: R.C. Walker Address: NRAO, P.O. Box O Socorro, NM 87801 USA Phone: +1-505-835-7247 (w) / +1-505-835-3972 (h) EMAIL: cwalker@nrao.edu Fax: +1-505-835-7027 Phone during observation: +1-505-835-7247 (w) / +1-505-835-3972 (h) Observing mode: VLBA Notes: COVER LETTER: This 6 session project samples different possible frame rates for a 7mm movie of M87. It is needed prior to full movie observations because the rate of changes near the core is not known. It is likely that they have been severly undersampled by previous observations. Each session will use the same schedule. The sessions should fall in the following windows (days) after the first: 0, 3, 6, 12-16, 31-39, 80-100. The program committee has asked me to coordinate with Phillip Hicks on the scheduling. I will do so. I propose to use long range forcasts to identify a 6 day window in which to start, and then, at 12, 31, and 80 days, identify a day within the 5, 9, and 21 day windows that follow in which to do a session. Here is the key information from the time allocation email: ------------------ PROPOSAL STATUS ( 01/06/05 ): Approved for dynamic scheduling, high priority Proposal Selection Committee - December 3, 2004: We ask Phillip Hicks to seek permission from Craig Walker before starting the observing sequence, rather than having Phillip be responsible for making the long-term weather forecast. CURRENT TIME ALLOCATION: 6 times 10.0 hrs dynamically scheduled centered at LST 12.5 with 128 Mbits/sec recording --------------------- I apologize for the long delay in starting this project, but it will take my attention once started and, for personal reasons, I did not feel I was in a position to provide that over the last year. ------------------------------------------------------------------------- Schedule for VLBA_BR (Code Br ) Page 2 bw082 M87 movie pilot. Walker, Ly, Junor, Hardee UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. For disks, the footages are really the GBytes TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 14 Apr 2006 Day 104 --- Next scan frequencies: 43127.49 43127.49 43135.49 43135.49 Next BBC frequencies: 727.49 727.49 735.49 735.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 01 14 10 OJ287 06 43 45 51.5 125.1 -2.2 -35.5 0 1 1 0 01 13 40 01 22 08 --- 06 51 45 52.5 127.6 -2.1 -34.3 479 F 1 8 01 14 03 01 24 12 3C274 06 53 49 12.9 85.8 -5.6 -43.0 39 1 1 8 01 23 42 01 39 10 --- 07 08 49 15.4 88.6 -5.4 -43.1 898 F 1 23 01 24 05 01 42 36 3C274 07 12 16 16.0 89.2 -5.3 -43.1 199 1 1 23 01 42 06 01 57 34 --- 07 27 16 18.5 92.0 -5.1 -43.1 898 F 1 38 01 42 29 02 01 01 3C274 07 30 43 19.1 92.7 -5.0 -43.0 200 1 1 38 02 00 31 02 15 58 --- 07 45 43 21.6 95.5 -4.8 -42.8 898 F 1 53 02 00 54 02 16 42 3C279 07 46 27 3.9 103.2 -5.2 H -40.8 3 1 1 53 02 15 58 02 18 42 --- 07 48 27 4.2 103.6 -5.1 H -40.7 0 F 1 56 02 15 58 02 19 26 3C274 07 49 12 22.2 96.2 -4.7 -42.8 2 1 1 56 02 18 42 02 34 24 --- 08 04 12 24.6 99.1 -4.4 -42.4 898 F 1 71 02 18 42 02 35 08 3C279 08 04 56 6.9 106.7 -4.9 -40.0 3 1 1 71 02 34 24 02 37 07 --- 08 06 56 7.2 107.1 -4.8 -39.9 120 F 1 74 02 34 24 02 37 52 3C274 08 07 41 25.2 99.8 -4.4 -42.3 3 1 1 74 02 37 07 02 52 50 --- 08 22 41 27.7 102.9 -4.1 -41.8 898 F 1 89 02 37 07 02 53 34 3C279 08 23 25 9.8 110.3 -4.6 -39.0 3 1 1 89 02 52 50 02 55 34 --- 08 25 25 10.1 110.7 -4.5 -38.9 120 F 1 91 02 52 50 02 56 18 3C274 08 26 10 28.2 103.6 -4.1 -41.6 2 1 1 91 02 55 34 03 11 16 --- 08 41 10 30.6 106.8 -3.8 -40.9 898 F 1 107 02 55 34 03 12 00 3C279 08 41 54 12.7 114.0 -4.2 -37.8 2 1 1 107 03 11 16 03 14 00 --- 08 43 54 13.0 114.4 -4.2 -37.7 120 F 1 109 03 11 16 03 14 44 3C274 08 44 39 31.2 107.5 -3.8 -40.7 2 1 1 109 03 14 00 03 29 42 --- 08 59 39 33.6 110.8 -3.5 -39.7 898 F 1 124 03 14 00 03 30 26 3C279 09 00 23 15.4 117.8 -3.9 -36.4 2 1 1 124 03 29 42 03 32 25 --- 09 02 23 15.7 118.2 -3.9 -36.3 120 F 1 127 03 29 42 Schedule for VLBA_BR (Code Br ) Page 3 bw082 M87 movie pilot. Walker, Ly, Junor, Hardee UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. For disks, the footages are really the GBytes TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 14 Apr 2006 Day 104 --- 03 34 25 OJ287 09 04 23 61.9 184.6 0.2 3.3 21 1 1 127 03 33 55 03 39 24 --- 09 09 23 61.8 187.1 0.2 5.0 299 F 1 132 03 34 18 03 41 15 J1159+2914 09 11 14 52.7 104.9 -2.8 -47.6 50 1 1 132 03 40 45 03 46 14 =1156+295 09 16 14 53.5 106.1 -2.7 -47.3 299 F 1 138 03 41 08 03 47 15 3C274 09 17 15 36.3 114.9 -3.2 -38.3 21 1 1 138 03 46 45 04 02 13 --- 09 32 15 38.5 118.6 -3.0 -36.9 898 F 1 153 03 47 08 04 02 57 3C279 09 33 00 20.1 124.7 -3.4 -33.5 1 1 1 153 04 02 13 04 04 57 --- 09 35 00 20.4 125.2 -3.4 -33.3 120 F 1 155 04 02 13 04 05 41 3C274 09 35 45 39.0 119.4 -2.9 -36.5 1 1 1 155 04 04 57 04 20 39 --- 09 50 45 41.1 123.3 -2.7 -34.8 898 F 1 170 04 04 57 04 21 23 3C279 09 51 29 22.5 128.9 -3.1 -31.5 1 1 1 170 04 20 39 04 23 23 --- 09 53 29 22.8 129.4 -3.1 -31.2 120 F 1 173 04 20 39 04 24 08 3C274 09 54 14 41.6 124.2 -2.6 -34.4 1 1 1 173 04 23 23 04 39 05 --- 10 09 14 43.6 128.4 -2.4 -32.4 898 F 1 188 04 23 23 04 39 49 3C279 10 09 58 24.9 133.2 -2.8 -29.3 1 1 1 188 04 39 05 04 41 49 --- 10 11 58 25.1 133.7 -2.7 -29.0 120 F 1 191 04 39 05 04 42 33 3C274 10 12 42 44.1 129.4 -2.3 -31.9 0 1 1 191 04 41 49 04 57 31 --- 10 27 42 46.0 133.9 -2.1 -29.5 898 F 1 206 04 41 49 04 58 14 3C279 10 28 26 27.0 137.7 -2.5 -26.8 0 1 1 206 04 57 31 05 00 14 --- 10 30 26 27.3 138.2 -2.4 -26.5 120 F 1 209 04 57 31 05 00 58 3C274 10 31 11 46.4 134.9 -2.0 -28.9 0 1 1 209 05 00 14 05 15 56 --- 10 46 11 48.1 139.7 -1.7 -26.2 898 F 1 224 05 00 14 05 16 40 3C279 10 46 55 29.0 142.4 -2.2 -24.1 0 1 1 224 05 15 56 05 18 40 --- 10 48 55 29.2 143.0 -2.1 -23.8 120 F 1 227 05 15 56 05 19 24 3C274 10 49 40 48.5 140.9 -1.7 -25.5 0 1 1 227 05 18 40 05 34 22 --- 11 04 40 49.9 146.0 -1.4 -22.5 898 F 1 242 05 18 40 05 35 06 3C279 11 05 24 30.8 147.3 -1.9 -21.2 0 1 1 242 05 34 22 05 37 06 --- 11 07 24 31.0 147.9 -1.8 -20.9 120 F 1 244 05 34 22 Schedule for VLBA_BR (Code Br ) Page 4 bw082 M87 movie pilot. Walker, Ly, Junor, Hardee UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. For disks, the footages are really the GBytes TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 14 Apr 2006 Day 104 --- 05 37 51 3C274 11 08 09 50.3 147.2 -1.4 -21.7 0 1 1 244 05 37 06 05 52 48 --- 11 23 09 51.5 152.7 -1.1 -18.3 898 F 1 260 05 37 06 05 53 33 3C279 11 23 53 32.3 152.4 -1.5 -18.1 0 1 1 260 05 52 48 05 55 32 --- 11 25 53 32.5 153.0 -1.5 -17.7 120 F 1 262 05 52 48 05 57 32 J1159+2914 11 27 53 70.1 159.1 -0.5 -15.8 38 1 1 262 05 57 02 06 02 31 =1156+295 11 32 53 70.4 162.2 -0.4 -13.5 299 F 1 268 05 57 25 06 04 32 J1310+3220 11 34 55 66.0 122.5 -1.6 -41.8 89 1 1 268 06 04 02 06 09 31 =1308+326 11 39 55 66.7 124.4 -1.5 -40.6 299 F 1 273 06 04 25 06 12 18 3C274 11 42 42 52.8 160.2 -0.8 -13.4 133 1 1 273 06 11 48 06 27 16 --- 11 57 42 53.5 166.2 -0.6 -9.4 898 F 1 288 06 12 11 06 28 00 3C279 11 58 27 34.6 162.4 -1.0 -11.7 0 1 1 288 06 27 16 06 30 00 --- 12 00 27 34.7 163.0 -0.9 -11.3 120 F 1 291 06 27 16 06 30 44 3C274 12 01 11 53.7 167.6 -0.5 -8.5 0 1 1 291 06 30 00 06 45 41 --- 12 16 11 54.1 173.8 -0.2 -4.3 898 F 1 306 06 30 00 06 46 25 3C279 12 16 55 35.3 167.9 -0.7 -8.1 0 1 1 306 06 45 41 06 48 25 --- 12 18 55 35.4 168.5 -0.6 -7.7 120 F 1 308 06 45 41 06 49 08 3C274 12 19 38 54.1 175.2 -0.2 -3.3 0 1 1 308 06 48 25 07 04 06 --- 12 34 38 54.2 181.5 0.1 1.0 898 F 1 324 06 48 25 07 04 49 3C279 12 35 21 35.8 173.5 -0.4 -4.4 0 1 1 324 07 04 06 07 06 48 --- 12 37 21 35.9 174.1 -0.3 -3.9 120 F 1 326 07 04 06 07 07 31 3C274 12 38 04 54.2 182.9 0.1 2.0 0 1 1 326 07 06 48 07 22 28 --- 12 53 04 53.9 189.1 0.4 6.2 898 F 1 341 07 06 48 07 23 10 3C279 12 53 46 36.0 179.2 0.0 -0.6 0 1 1 341 07 22 28 07 25 10 --- 12 55 46 36.0 179.8 0.0 -0.2 120 F 1 344 07 22 28 07 25 52 3C274 12 56 28 53.8 190.5 0.4 7.2 0 1 1 344 07 25 10 07 40 49 --- 13 11 28 53.2 196.6 0.7 11.3 898 F 1 359 07 25 10 07 41 30 3C279 13 12 08 35.9 184.8 0.3 3.2 0 1 1 359 07 40 49 07 43 29 --- 13 14 08 35.9 185.4 0.3 3.6 120 F 1 362 07 40 49 Schedule for VLBA_BR (Code Br ) Page 5 bw082 M87 movie pilot. Walker, Ly, Junor, Hardee UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. For disks, the footages are really the GBytes TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 14 Apr 2006 Day 104 --- 07 44 10 3C274 13 14 49 53.1 197.9 0.7 12.1 0 1 1 362 07 43 29 07 59 07 --- 13 29 49 52.2 203.8 1.0 16.0 898 F 1 377 07 43 29 07 59 47 3C279 13 30 28 35.5 190.4 0.6 7.0 0 1 1 377 07 59 07 08 01 46 --- 13 32 28 35.5 191.0 0.6 7.4 120 F 1 379 07 59 07 08 02 25 3C274 13 33 07 52.0 205.1 1.0 16.8 0 1 1 379 08 01 46 08 17 23 --- 13 48 07 50.8 210.6 1.3 20.4 898 F 1 394 08 01 46 08 18 02 3C279 13 48 46 34.8 195.9 0.9 10.6 1 1 1 394 08 17 23 08 20 01 --- 13 50 46 34.7 196.5 0.9 11.0 120 F 1 397 08 17 23 08 22 01 J1159+2914 13 52 46 61.2 239.1 1.9 41.0 61 1 1 397 08 21 31 08 27 00 =1156+295 13 57 46 60.5 240.8 2.0 41.9 299 F 1 402 08 21 54 08 27 37 J1310+3220 13 58 23 71.8 213.9 0.8 26.1 8 1 1 402 08 27 00 08 32 36 =1308+326 14 03 23 71.3 216.9 0.9 28.3 299 F 1 408 08 27 00 08 33 26 3C274 14 04 14 49.3 216.3 1.6 23.9 0 1 1 408 08 32 56 08 48 24 --- 14 19 14 47.7 221.3 1.8 26.8 898 F 1 423 08 33 19 08 49 07 3C279 14 19 56 33.0 205.0 1.4 16.5 7 1 1 423 08 48 24 08 51 06 --- 14 21 56 32.9 205.5 1.4 16.8 120 F 1 425 08 48 24 08 51 50 3C274 14 22 40 47.4 222.4 1.9 27.4 8 1 1 425 08 51 06 09 06 47 --- 14 37 40 45.6 227.1 2.1 30.0 898 F 1 440 08 51 06 09 07 31 3C279 14 38 24 31.6 210.1 1.7 19.7 10 1 1 440 09 06 47 09 09 31 --- 14 40 24 31.4 210.7 1.7 20.0 120 F 1 443 09 06 47 09 10 16 3C274 14 41 09 45.2 228.1 2.2 30.6 11 1 1 443 09 09 31 09 25 13 --- 14 56 09 43.2 232.5 2.4 32.8 898 F 1 458 09 09 31 09 25 57 3C279 14 56 52 29.9 215.1 2.0 22.7 11 1 1 458 09 25 13 09 27 56 --- 14 58 52 29.7 215.7 2.0 23.0 120 F 1 461 09 25 13 09 28 39 3C274 14 59 36 42.8 233.4 2.5 33.3 11 1 1 461 09 27 56 09 43 37 --- 15 14 36 40.7 237.5 2.7 35.2 898 F 1 476 09 27 56 09 44 17 3C279 15 15 15 28.1 219.9 2.3 25.5 8 1 1 476 09 43 37 09 46 16 --- 15 17 15 27.8 220.4 2.3 25.8 120 F 1 479 09 43 37 Schedule for VLBA_BR (Code Br ) Page 6 bw082 M87 movie pilot. Walker, Ly, Junor, Hardee UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. For disks, the footages are really the GBytes TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 14 Apr 2006 Day 104 --- 09 46 55 3C274 15 17 54 40.3 238.3 2.8 35.6 8 1 1 479 09 46 16 10 01 52 --- 15 32 54 38.1 242.2 3.0 37.2 898 F 1 494 09 46 16 10 02 28 3C279 15 33 30 26.0 224.5 2.6 28.0 6 1 1 494 10 01 52 10 04 28 --- 15 35 30 25.8 224.9 2.6 28.3 120 F 1 496 10 01 52 10 05 04 3C274 15 36 07 37.6 242.9 3.1 37.5 7 1 1 496 10 04 28 10 20 02 --- 15 51 07 35.3 246.5 3.3 38.8 898 F 1 511 10 04 28 10 20 38 3C279 15 51 43 23.8 228.8 2.9 30.3 7 1 1 511 10 20 02 10 22 38 --- 15 53 43 23.6 229.3 3.0 30.6 120 F 1 514 10 20 02 10 23 15 3C274 15 54 20 34.9 247.3 3.4 39.1 8 1 1 514 10 22 38 10 38 12 --- 16 09 20 32.5 250.7 3.6 40.1 898 F 1 529 10 22 38 10 38 47 3C279 16 09 55 21.5 233.0 3.2 32.4 7 1 1 529 10 38 12 10 40 47 --- 16 11 55 21.2 233.5 3.3 32.6 120 F 1 531 10 38 12 10 41 22 3C274 16 12 30 32.0 251.4 3.7 40.3 7 1 1 531 10 40 47 10 56 19 --- 16 27 30 29.6 254.6 3.9 41.2 898 F 1 546 10 40 47 10 56 52 3C279 16 28 03 19.0 237.0 3.5 34.2 5 1 1 546 10 56 19 10 58 52 --- 16 30 03 18.7 237.4 3.6 34.4 120 F 1 549 10 56 19 11 01 31 1726+455 16 32 42 80.3 100.5 -0.9 -69.4 30 1 1 549 11 01 01 11 04 30 --- 16 35 42 80.7 101.7 -0.9 -68.8 180 F 1 552 11 01 24 11 07 48 1751+288 16 39 01 65.9 136.5 -1.2 -31.6 162 1 1 552 11 07 18 11 10 47 --- 16 42 01 66.2 137.9 -1.2 -30.7 180 F 1 556 11 07 41 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: bw082.set Matches group v7mm_c8 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 9 Station: VLBA_BR Total bit rate: 128 Format: VLBA1:4 Bits per sample: 2 Sample rate: 16.000 Number of channels: 4 Speedup factor: 2.00 Disk used to record data. 1st LO= 42400.00 42400.00 42400.00 42400.00 Net SB= U U U U Pol. = RCP LCP RCP LCP BBC = 1 2 3 4 BBC SB= U U U U IF = A C A C VLBA FE= 7mm omit 7mm omit VLBA Synth= 15.4 7.6 11.6 The following frequency sets based on this setup were used. Frequency Set: 9 Setup file default. Used pcal sets: 1 LO sum= 43127.49 43127.49 43135.49 43135.49 BBC fr= 727.49 727.49 735.49 735.49 Bandwd= 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S1 S3 S1 S2 S3 S4 PCALXB2= S2 S4 S2 S4 M1 M2 M3 M4 PCALFR1= 510 510 6510 6510 0 0 0 0 PCALFR2= 510 510 6510 6510 0 0 0 0 Track assignments are: track1= 2, 18, 3, 19 barrel=roll_off SOURCE LIST -- bw082 M87 movie pilot. Walker, Ly, Junor, Hardee 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) J0854+2006 08 51 57.250618 * 08 54 48.874930 08 55 10.866022 0.21 0851+202 20 17 58.41741 * 20 06 30.64086 20 05 10.19179 0.40 J0854+20 /home/filehost/cwalker/sched/catalogs/sources.vlba * OJ287 VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 0.216 scan hours, 9.723 baseline hours above horizon. * J1159+2914 11 56 57.786209 * 11 59 31.833910 11 59 52.700672 0.23 1156+295 29 31 25.73874 * 29 14 43.82684 29 12 36.13857 0.40 J1159+29 /home/filehost/cwalker/sched/catalogs/sources.vlba VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 0.249 scan hours, 11.219 baseline hours above horizon. J1230+1223 12 28 17.569279 * 12 30 49.423381 12 31 09.742905 0.31 1228+126 12 40 01.74901 * 12 23 28.04383 12 21 16.71264 0.20 * 3C274 /home/filehost/cwalker/sched/catalogs/sources.vlba J1230+12 VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 7.230 scan hours, 292.449 baseline hours above horizon. J1256-0547 12 53 35.831291 * 12 56 11.166559 12 56 31.749447 0.20 1253-055 -05 31 07.99586 *-05 47 21.52472 -05 49 32.95757 0.30 * 3C279 /home/filehost/cwalker/sched/catalogs/sources.vlba J1256-05 VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 0.964 scan hours, 36.334 baseline hours above horizon. * J1310+3220 13 08 07.560131 * 13 10 28.663850 13 10 48.121939 0.24 1308+326 32 36 40.23883 * 32 20 43.78290 32 18 36.65081 0.40 J1310+32 /home/filehost/cwalker/sched/catalogs/sources.vlba VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 0.166 scan hours, 7.480 baseline hours above horizon. J1727+4530 17 26 01.198750 * 17 27 27.650804 17 27 39.510219 0.29 * 1726+455 45 33 04.55118 * 45 30 39.73133 45 29 56.02484 0.40 J1727+45 /home/filehost/cwalker/sched/catalogs/sources.vlba VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 0.050 scan hours, 2.244 baseline hours above horizon. J1753+2848 17 51 45.401869 * 17 53 42.473641 17 53 57.730499 0.23 * 1751+288 28 48 36.64959 * 28 48 04.93887 28 47 37.28540 0.40 J1753+28 /home/filehost/cwalker/sched/catalogs/sources.vlba VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 0.050 scan hours, 2.244 baseline hours above horizon. 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) OJ287 106.4 J1159+2914 135.8 3C274 153.9 3C279 171.1 J1310+3220 138.1 1726+455 103.6 1751+288 105.8 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