SUMMARY FILE FOR PROJECT: BH126A COVER INFORMATION: Experiment: Monitoring Knot HST-1 in M87 Jet Exp. Code: BH126A Start Day 358 is Thu 23 Dec 2004 MJD 53362 Schedule Version: 1.00 Processed by SCHED version: NRAO internal release of 4 October 2004 PI: D.E. Harris Address: MS-3, CfA, 60 Garden St Cambridge, MA 02138 U.S.A. Phone: 617 495 7148 EMAIL: harris@cfa.harvard.edu Fax: 617 495 7356 Phone during observation: 617 495 7148 Observing mode: 90cm 128-4-2 Notes: COVER LETTER: BH126 SUMMARY (as of Dec 6, 2004): We request within 1 week to 10 days coordination with planned Chandra X-ray Observatory observations at 4 epochs: 1. 2Jan05 (VLBA 90cm, 90/50cm, L band for 8 hrs/run = BH126 A, B, C). Coordinated also with VLA observation AH862 on 31Dec04. 2. 20Apr05 or later (VLBA 90cm, 90/50cm, L band for 8 hrs/run = BH126 D, E, F). Coordinated also with VLA observation AH862. 3. 1Jun05 (VLBA L-band for 8 hrs = BH126 G). 4. 6Aug05 (VLBA L band for 8 hrs = BH126 H). -------------------------------------------------------------------- Here is the official dynamic scheduling sheet: ================================================================ Preferred Dynamic Contraints. Alter [defaults] as desired. ================================================================ Equipment constraints: Stations. Below each station code, the "o" indicates an [optional] station that is to be used if it is available. Change "o" to "r" if the station is required or change "o" to "n" if the station is not to be used. SC HN NL FD LA PT KP OV BR MK o o o o o o o o o r Minimum number of stations [7]: May we swap PT for a single VLA antenna? [yes] Consult http://www.aoc.nrao.edu/~gtaylor/y1gotcha.html to decide. If you adopt the default, then both PT and VLA1 must be in the stations list in the keyin file. Bands and polarizations. Below each band code, insert "R" if the righthand polarization is to be used, "L" if the lefthand polarization is to be used, "d" if dual polarizations are to be used, or "o" if the band is in your setups but scheduling should not be constrained by its availability. 90cm 50cm 20cm 13cm 6cm 4cm 2cm 1cm 7mm 3mm d Weather constraints: [appropriate for bands marked "L", "R", or "d" above and for at least the minimum number of stations] Date constraints: Preferred date(s), usually a series start [none]: Within 1 week to 10 days of 2Jan05 (Chandra Obs) and 31Dec04 (VLA Obs) Excluded dates plus reason [none]: Too close to Sun. Preferred interval between segments in days [none]: Special conditions (e.g., a series with different spacings in time) [See the comments at the top.]: CORRELATION REQUESTS (Defaults in parentheses): Correlator (Required if recording): SOCORRO Correlator average time (2 sec): 1.050 sec. Alternate average time (for spacecraft). 0.000 sec. Spectral channels per baseband (16): 64 Number of antennas to be correlated: 10 Polarization (ON): ON Correlator weighting function (UNIFORM): UNIFORM Distribution tape (DAT): DAT Source positions from: STANDARD Shipping address for correlator output: Bill Junor IST-1, Space & Atmospheric Sciences MS D466, LANL, P.O. Box 1663 Los Alamos, New Mexico, 87545, USA Correlator Notes: DERIVED INFORMATION FOR CORRELATION: Elapsed time for project: 7.92 hours. Total time in scheduled scans: 7.40 hours. Total time in recording scans: 7.40 hours. Total number of baseline hours: 360.01 (Recording scans only) Projected maximum data output rate from the correlator: 429.1 kbytes/sec if processed in one pass. Projected correlator output data set size: 5055.8 Mbytes NOTE: Above numbers assume the same correlator parameters are used for all data. NOTE: Output data set size large. Consider requesting high density tapes. STATIONS USED IN SCHEDULE: Station Code Latitude Longitude Elevation X Y Z VLBA_SC Sc 17.75658 64.58363 -15. 2607848.52 -5488069.69 1932739.54 VLBA_HN Hn 42.93361 71.98658 296. 1446375.12 -4447939.65 4322306.12 VLBA_NL Nl 41.77142 91.57414 222. -130872.25 -4762317.11 4226851.04 VLBA_FD Fd 30.63503 103.94482 1606. -1324009.13 -5332181.96 3231962.47 VLBA_LA La 35.77512 106.24560 1962. -1449752.36 -4975298.59 3709123.93 VLBA_PT Pt 34.30102 108.11919 2365. -1640953.71 -5014816.02 3575411.88 VLBA_KP Kp 31.95630 111.61242 1902. -1995678.63 -5037317.71 3357328.13 VLBA_OV Ov 37.23165 118.27705 1196. -2409150.11 -4478573.23 3838617.40 VLBA_BR Br 48.13122 119.68328 251. -2112064.98 -3705356.52 4726813.80 VLBA_MK Mk 19.80138 155.45550 3763. -5464074.96 -2495249.12 2148296.84 BASELINE LENGTHS (km) Sc Hn Nl Fd La Pt Kp Ov Br Mk Sc 0 2853 3645 4143 4458 4579 4839 5460 5767 8611 Hn 2853 0 1611 3105 3006 3226 3623 3885 3657 7502 Nl 3645 1611 0 1654 1432 1663 2075 2328 2300 6156 Fd 4143 3105 1654 0 608 564 744 1508 2345 5134 La 4458 3006 1432 608 0 236 652 1088 1757 4970 Pt 4579 3226 1663 564 236 0 417 973 1806 4795 Kp 4839 3623 2075 744 652 417 0 845 1913 4466 Ov 5460 3885 2328 1508 1088 973 845 0 1214 4015 Br 5767 3657 2300 2345 1757 1806 1913 1214 0 4398 Mk 8611 7502 6156 5134 4970 4795 4466 4015 4398 0 RECORDING SYSTEM INFORMATION: TAPES - Stations potentially recording on tape. (See setup details later for times per pass.) Station Drives Head pos Tape len Density Start position Auto Auto Recorder (ft) Driv Head indx Aloc Reverse VLBA_SC 2 14 17600 High 1 1 Yes Yes VLBA VLBA_HN 2 14 17600 High 1 1 Yes Yes VLBA VLBA_NL 2 14 17600 High 1 1 Yes Yes VLBA VLBA_FD 2 14 17600 High 1 1 Yes Yes VLBA VLBA_LA 2 14 17600 High 1 1 Yes Yes VLBA VLBA_PT 2 14 17600 High 1 1 Yes Yes VLBA VLBA_KP 2 14 17600 High 1 1 Yes Yes VLBA VLBA_OV 2 14 17600 High 1 1 Yes Yes VLBA VLBA_BR 2 14 17600 High 1 1 Yes Yes VLBA VLBA_MK 2 14 17600 High 1 1 Yes Yes VLBA EXPERIMENT SUMMARY: Number of input scans: 55 Number of scans scheduled: 24 Number of stations: 10 Number of sources input: 3 Number of setup files used: 1 Station summaries (tape stations): Station Control Scans Scan Hours Tape hours Tapes Passes Readbacks VLBA_SC VLBA 16 5.48 5.57 1 8 4 VLBA_HN VLBA 19 6.15 6.26 1 9 7 VLBA_NL VLBA 23 7.31 7.44 1 11 6 VLBA_FD VLBA 24 7.40 7.53 1 11 5 VLBA_LA VLBA 24 7.40 7.53 1 11 5 VLBA_PT VLBA 24 7.40 7.53 1 11 5 VLBA_KP VLBA 24 7.40 7.53 1 11 5 VLBA_OV VLBA 24 7.40 7.53 1 11 5 VLBA_BR VLBA 24 7.40 7.53 1 11 5 VLBA_MK VLBA 20 5.82 5.93 1 9 5 Station summaries (disk stations): Station Control Scans Scan Hours Record hrs Gbytes Note: Tapes started before scan start time 222 times. See PRESTART and MINPAUSE. They may have been kept running through short scan gaps. The number can be large because each station/scan combination counts. Setup file: bw051.set Matches group v5090n in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 1 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 2 Sample rate: 16.000 Number of channels: 4 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= -500.00 -500.00 -500.00 -500.00 Net SB= U U U U Pol. = RCP LCP RCP LCP BBC = 1 2 3 4 BBC SB= U U U U IF = B D B D VLBA FE= omit 90cm omit 90cm VLBA Synth= 15.4 15.4 15.4 The following frequency sets based on this setup were used. Frequency Set: 1 Setup file default. Used pcal sets: 1 LO sum= 324.49 324.49 332.49 332.49 BBC fr= 824.49 824.49 832.49 832.49 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_auto SUMMARY for experiment BH126A Monitoring Knot HST-1 in M87 Jet Top item is: Start elevation, flag (D=>Down, H=>Below Horizon, t=>Tape Change.) Bottom item is: Start azimuth, flag (D=>Down, H=>Below Horizon, t=>Tape Change.) TYPE top: -=> normal scan, P=>Pointing or Ta; bottom: -=>recording, N=>not recording. Day 358 is Thu 23 Dec 2004 MJD 53362 DAY START UT SOURCE TYPE STATIONS t => tape change STOP UT Sc Hn Nl Fd La Pt Kp Ov Br Mk 358 09:33:24 3C147 - 16 38 50 51 56 56 57 64 70 60 358 09:38:24 bw051.set - -42 -53 -58 -47 -52 -50 -46 -51 -74 7 358 09:40:53 1148-001 - 71 45 39 38 34 33 31 24 19 --- 358 09:45:52 - - 165 162 137 118 119 117 113 111 114 --- 358 09:46:52 3C274 - 76 55 44 38 35 34 32 26 24 --- 358 10:16:47 - - 111 143 118 99 101 99 95 94 98 --- 358 10:17:47 3C274 - 82 57 49 45 42 40 38 32 29 --- 358 10:47:42 - - 134 156 126 104 107 104 100 99 104 --- 358 10:49:47 3C147 - --- 28 38 39 43 44 44 52 58 58 358 10:54:47 - - --- 314 307 -48 -52 -51 -49 -54 -68 -17 358 10:57:05 1148-001 - 67 46 46 51 46 46 45 38 30 12 358 11:02:04 - - 219 190 161 138 139 136 130 127 131 95 358 11:03:04 3C274 - 82 59 55 54 50 49 47 41 36 --- 358 11:32:59 - - 227 177 142 113 117 113 108 107 114 --- 358 11:33:59 3C274 - 76 59 58 60 55 55 54 46 40 16 358 12:03:54 - - 249 192 154 122 126 121 115 114 122 82 358 12:06:00 3C147 - --- 18 27 26 31 32 32 40 47 50 358 12:10:59 - - --- 322 314 -46 312 -48 -48 -52 299 -33 358 12:13:28 1148-001 - 52 41 47 58 53 54 55 48 38 30 358 12:18:27 - - 245 215 190 169 166 163 156 149 152 103 358 12:19:27 3C274 - 65 56 61 67 62 62 62 54 46 27 358 12:49:22 - - 261 212 176 141 143 138 129 126 135 86 358 12:50:22 3C274 - 58 52 60 71 65 66 66 59 50 34 358 13:20:17 - - 265 223 191 160 159 153 143 137 145 88 358 13:22:16 3C147 - --- --- 18 15 20 20 21 28 36 39 358 13:27:16 - - --- --- 322 319 318 317 317 313 307 -41 358 13:29:05 1148-001 - 35 31 42 57 52 54 57 52 41 47 358 13:34:04 - - 256 235 215 204 198 195 190 178 176 114 358 13:35:04 3C274 - 47 46 57 71 67 68 70 64 53 44 358 14:04:59 - - 269 237 211 194 185 181 171 158 162 92 358 14:05:59 3C274 - 40 41 54 69 65 67 70 65 54 52 358 14:35:54 - - 271 245 223 214 203 200 193 175 174 95 SUMMARY for experiment BH126A Monitoring Knot HST-1 in M87 Jet Top item is: Start elevation, flag (D=>Down, H=>Below Horizon, t=>Tape Change.) Bottom item is: Start azimuth, flag (D=>Down, H=>Below Horizon, t=>Tape Change.) TYPE top: -=> normal scan, P=>Pointing or Ta; bottom: -=>recording, N=>not recording. Day 358 is Thu 23 Dec 2004 MJD 53362 DAY START UT SOURCE TYPE STATIONS t => tape change STOP UT Sc Hn Nl Fd La Pt Kp Ov Br Mk Skipping scan on 3C147 358 14:36:54 1148-001 - 19 20 33 48 46 48 51 50 40 61 358 14:41:53 bw051.set - 263 250 234 228 222 220 217 205 199 131 358 14:42:53 3C274 - 31 35 48 63 61 63 67 64 54 60 358 15:12:48 - - 274 253 235 232 221 220 216 196 190 100 358 15:13:48 3C274 - 24 29 43 57 56 58 62 62 53 67 358 15:43:43 - - 276 259 243 242 233 232 230 212 202 106 Skipping scan on 3C147 358 15:44:42 1148-001 - --- --- 22 36 35 37 41 42 34 69 358 15:49:42 - - --- --- 248 244 239 238 237 226 219 167 358 15:50:41 3C274 - --- 23 37 50 50 52 56 57 50 75 358 16:20:37 - - --- 266 252 251 244 243 242 227 216 119 358 16:21:36 3C274 - --- --- 31 44 44 46 50 52 46 81 358 16:51:32 - - --- --- 258 257 251 250 250 237 226 145 Skipping scan on 3C147 358 16:52:31 1148-001 - --- --- --- 22 22 24 28 31 26 66 358 16:57:31 - - --- --- --- 256 252 251 250 242 236 213 358 16:58:30 3C274 - --- --- 25 36 37 39 42 46 41 82 358 17:28:25 - - --- --- 265 263 258 258 257 247 236 208 SUMMARY for experiment BH126A Monitoring Knot HST-1 in M87 Jet Top item is: Scan end: Tape drive, direction, and head index. Disk Gbytes. Bottom item is: Headset at scan end and tape footage (thousands) at scan start. Tape parameters are only predictions for stations using automatic tape allocation. TYPE top: -=> normal scan, P=>Pointing or Ta; bottom: -=>recording, N=>not recording. Day 358 is Thu 23 Dec 2004 MJD 53362 DAY START UT SOURCE TYPE STATIONS t => tape change STOP UT Sc Hn Nl Fd La Pt Kp Ov Br Mk 358 09:33:24 3C147 - 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 358 09:38:24 bw051.set - 1/00 1/00 1/00 1/00 1/00 1/00 1/00 1/00 1/00 1/00 358 09:40:53 1148-001 - 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 --- 358 09:45:52 - - 1/02 1/02 1/02 1/02 1/02 1/02 1/02 1/02 1/02 --- 358 09:46:52 3C274 - 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 1F01 --- 358 10:16:47 - - 1/04 1/04 1/04 1/04 1/04 1/04 1/04 1/04 1/04 --- 358 10:17:47 3C274 - 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1R02 --- 358 10:47:42 - - 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 --- 358 10:49:47 3C147 - --- 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1F01 358 10:54:47 - - --- 1/07 1/07 1/07 1/07 1/07 1/07 1/07 1/07 1/02 358 10:57:05 1148-001 - 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1R02 1F01 358 11:02:04 - - 1/07 1/05 1/05 1/05 1/05 1/05 1/05 1/05 1/05 1/04 358 11:03:04 3C274 - 1F03 1F03 1F03 1F03 1F03 1F03 1F03 1F03 1F03 --- 358 11:32:59 - - 1/05 1/02 1/02 1/02 1/02 1/02 1/02 1/02 1/02 --- 358 11:33:59 3C274 - 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R02 358 12:03:54 - - 1/07 1/10 1/10 1/10 1/10 1/10 1/10 1/10 1/10 1/06 358 12:06:00 3C147 - --- 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R02 358 12:10:59 - - --- 1/13 1/13 1/13 1/13 1/13 1/13 1/13 1/13 1/17 358 12:13:28 1148-001 - 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R04 1R02 358 12:18:27 - - 1/16 1/11 1/11 1/11 1/11 1/11 1/11 1/11 1/11 1/15 358 12:19:27 3C274 - 1R04 1F05 1F05 1F05 1F05 1F05 1F05 1F05 1F05 1R02 358 12:49:22 - - 1/13 1/09 1/09 1/09 1/09 1/09 1/09 1/09 1/09 1/12 358 12:50:22 3C274 - 1F05 1F05 1F05 1F05 1F05 1F05 1F05 1F05 1F05 1F03 358 13:20:17 - - 1/01 1/03 1/03 1/03 1/03 1/03 1/03 1/03 1/03 1/00 358 13:22:16 3C147 - --- --- 1F05 1F05 1F05 1F05 1F05 1F05 1F05 1F03 358 13:27:16 - - --- --- 1/15 1/15 1/15 1/15 1/15 1/15 1/15 1/12 358 13:29:05 1148-001 - 1F05 1F05 1R06 1R06 1R06 1R06 1R06 1R06 1R06 1F03 358 13:34:04 - - 1/11 1/15 1/17 1/17 1/17 1/17 1/17 1/17 1/17 1/15 358 13:35:04 3C274 - 1R06 1R06 1R06 1R06 1R06 1R06 1R06 1R06 1R06 1R04 358 14:04:59 - - 1/13 1/17 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/17 358 14:05:59 3C274 - 1F07 1F07 1F07 1F07 1F07 1F07 1F07 1F07 1F07 1F05 358 14:35:54 - - 1/10 1/06 1/04 1/04 1/04 1/04 1/04 1/04 1/04 1/06 SUMMARY for experiment BH126A Monitoring Knot HST-1 in M87 Jet Top item is: Scan end: Tape drive, direction, and head index. Disk Gbytes. Bottom item is: Headset at scan end and tape footage (thousands) at scan start. Tape parameters are only predictions for stations using automatic tape allocation. TYPE top: -=> normal scan, P=>Pointing or Ta; bottom: -=>recording, N=>not recording. Day 358 is Thu 23 Dec 2004 MJD 53362 DAY START UT SOURCE TYPE STATIONS t => tape change STOP UT Sc Hn Nl Fd La Pt Kp Ov Br Mk Skipping scan on 3C147 358 14:36:54 1148-001 - 1F07 1F07 1F07 1F07 1F07 1F07 1F07 1F07 1F07 1F05 358 14:41:53 bw051.set - 1/02 1/06 1/08 1/08 1/08 1/08 1/08 1/08 1/08 1/06 358 14:42:53 3C274 - 1F07 1R08 1R08 1R08 1R08 1R08 1R08 1R08 1R08 1R06 358 15:12:48 - - 1/04 1/08 1/10 1/10 1/10 1/10 1/10 1/10 1/10 1/08 358 15:13:48 3C274 - 1R08 1R08 1R08 1R08 1R08 1R08 1R08 1R08 1R08 1R06 358 15:43:43 - - 1/16 1/15 1/13 1/13 1/13 1/13 1/13 1/13 1/13 1/15 Skipping scan on 3C147 358 15:44:42 1148-001 - --- --- 1F09 1F09 1F09 1F09 1F09 1F09 1F09 1R06 358 15:49:42 - - --- --- 1/01 1/01 1/01 1/01 1/01 1/01 1/01 1/03 358 15:50:41 3C274 - --- 1F09 1F09 1F09 1F09 1F09 1F09 1F09 1F09 1F07 358 16:20:37 - - --- 1/03 1/01 1/01 1/01 1/01 1/01 1/01 1/01 1/01 358 16:21:36 3C274 - --- --- 1R10 1R10 1R10 1R10 1R10 1R10 1R10 1R08 358 16:51:32 - - --- --- 1/14 1/14 1/14 1/14 1/14 1/14 1/14 1/11 Skipping scan on 3C147 358 16:52:31 1148-001 - --- --- --- 1R10 1R10 1R10 1R10 1R10 1R10 1R08 358 16:57:31 - - --- --- --- 1/10 1/10 1/10 1/10 1/10 1/10 1/12 358 16:58:30 3C274 - --- --- 1F11 1F11 1F11 1F11 1F11 1F11 1F11 1F09 358 17:28:25 - - --- --- 1/10 1/07 1/07 1/07 1/07 1/07 1/07 1/10 Automatic tape allocation requested for sites using VLBA control files and having 2 or more drives. SCHED cannot predict tape changes. Number of tapes used at each autoaloc station: Station Tapes VLBA_SC 0.54 VLBA_HN 0.61 VLBA_NL 0.72 VLBA_FD 0.73 VLBA_LA 0.73 VLBA_PT 0.73 VLBA_KP 0.73 VLBA_OV 0.73 VLBA_BR 0.73 VLBA_MK 0.58 ESTIMATED TAPE TIMES (With autoallocation): Times are approximate and assume project starts at the beginning of a tape. Times can be affected by actual tape length. Tape change may occur during scan preceeding indicated time. Tape start time. Tape end time. Station Day Time Day Time (UT) (UT) VLBA_SC 358 09:33:24 358 15:43:43 VLBA_HN 358 09:33:24 358 16:20:37 VLBA_NL 358 09:33:24 358 17:28:25 VLBA_FD 358 09:33:24 358 17:28:25 VLBA_LA 358 09:33:24 358 17:28:25 VLBA_PT 358 09:33:24 358 17:28:25 VLBA_KP 358 09:33:24 358 17:28:25 VLBA_OV 358 09:33:24 358 17:28:25 VLBA_BR 358 09:33:24 358 17:28:25 VLBA_MK 358 09:33:24 358 17:28:25 SOURCE LIST -- Monitoring Knot HST-1 in M87 Jet 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) (B1950) (J2000) (Date) J0542+4951 05 38 43.517539 * 05 42 36.137917 05 43 00.642342 0538+498 49 49 42.83693 * 49 51 07.23356 49 51 23.38306 * 3C147 /home/filehost/cwalker/sched/catalogs/sources.vlba J0542+49 ICRF - Ext.1 Source - 1998 IERS Annual Report 0.582 scan hours, 12.050 baseline hours above horizon. J1150-0023 11 48 10.124953 * 11 50 43.870762 11 50 58.768255 * 1148-001 -00 07 13.16375 *-00 23 54.20490 -00 25 30.47197 J1150-00 /home/filehost/cwalker/sched/catalogs/sources.vlba ICRF - Ext.1 Source - 1998 IERS Annual Report 0.582 scan hours, 22.023 baseline hours above horizon. J1230+1223 12 28 17.569280 * 12 30 49.423382 12 31 03.997900 1228+126 12 40 01.74911 * 12 23 28.04393 12 21 46.70199 * 3C274 /home/filehost/cwalker/sched/catalogs/sources.vlba J1230+12 ICRF - Ext.1 Source - 1998 IERS Annual Report 6.482 scan hours, 256.797 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) 3C147 153.1 1148-001 94.0 3C274 90.0 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 Source separations in degrees for pairs closer than 30.00 degrees. 1148-001 3C274 16.2005 J2000 coordinates formatted for possible transfer to the correlator data base: name = '3C147' ra = 05h42m36.137917s dec = 49d51'07.23356" name = '1148-001' ra = 11h50m43.870762s dec = -00d23'54.20490" name = '3C274' ra = 12h30m49.423382s dec = 12d23'28.04393" Catalog versions: Station Catalog: 2004Oct03-17:33:37 Frequency Catalog: 2004Oct03-17:33:37 Code versions: Release version: NRAO internal release of 4 October 2004 Version of sched code: 5.25 Version of VEX standard: 1.50 Version of VEX code: 0.79 Version of plot code: 1.05 Version of ephemeris code: 1.01 Version of PGPLOT: v5.2.0