COVER INFORMATION Station: VLBA_KP (Code Kp ) Experiment: Interstellar Scattering Observations of 1849+005 Exp. Code: BL112 Schedule Version: 2.00 Processed by SCHED version: Release of 02 July 2002 PI: Joseph Lazio Address: 6108 Redwood Lane Alexandria, VA 22310-2933 USA Phone: 202 404 6329 EMAIL: Joseph.Lazio@nrl.navy.mil Fax: 202 404 8894 Phone during observation: 202 404 6329 Observing mode: 13cm Notes: 1.5 hr dynamically-scheduled, ad hoc proposal LST(PT) start time can be in the range 15h to 20h Send observing logs and data tape to J. Lazio, address above Schedule for VLBA_KP (Code Kp ) Page 2 Interstellar Scattering Observations of 1849+005 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. TPStart: Tape motion start time. Frequencies are LO sum (band edge). 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) ---------------------------------------------------------------------------------------- --- Fri 23 Aug 2002 Day 235 --- Next scan frequencies: 2255.49 2255.49 2263.49 2263.49 2271.49 2271.49 2279.49 2279.49 Next BBC frequencies: 844.51 844.51 836.51 836.51 828.51 828.51 820.51 820.51 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 01 07 49 1849+005 15 46 02 36.1 116.1 -3.1 -49.6 0 1 1 0 01 07 49 01 37 44 --- 16 16 02 41.7 122.6 -2.6 -45.6 1795 F 1 11967 ---------- fringe finding pass ---------- 01 39 44 3C345 16 18 02 80.7 31.1 -0.4 -145.3 36 1 1 11967 01 39 44 01 46 43 --- 16 25 02 81.3 23.7 -0.3 -153.7 419 F 1 14760 01 46 43 1849+005 16 25 02 43.3 124.8 -2.4 -44.2 -82 1 2 14760 01 46 43 02 01 40 --- 16 40 02 45.8 128.6 -2.2 -41.5 815 R 1 14457 ---------- fringe finding pass ---------- 02 03 40 3C345 16 42 02 82.1 1.5 0.0 -178.4 29 1 2 14457 02 03 40 02 10 39 --- 16 49 02 82.1 -8.3 0.1 170.8 419 R 1 11664 02 10 39 1849+005 16 49 02 47.3 131.1 -2.0 -39.7 -99 1 3 11664 02 10 39 02 40 34 --- 17 19 02 51.7 140.5 -1.5 -32.7 1696 F 1 303 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: /home/filehost/cwalker/sched/setups/v13cm-128-8-1.set Matches group v13cm_2 in /home/filehost/cwalker/sched/catalogs/freq.dat LA,NL only 2200-2400 Setup group: 1 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 1 Sample rate: 16.000 Number of channels: 8 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= 3100.00 3100.00 3100.00 3100.00 3100.00 3100.00 3100.00 3100.00 Net SB= U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= L L L L L L L L IF = A C A C A C A C VLBA FE= 13cm omit 13cm omit VLBA Synth= 15.4 3.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 1 Setup file default. Used pcal sets: 1 LO sum= 2255.49 2255.49 2263.49 2263.49 2271.49 2271.49 2279.49 2279.49 BBC fr= 844.51 844.51 836.51 836.51 828.51 828.51 820.51 820.51 Bandwd= 8.000 8.000 8.000 8.000 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 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_auto SOURCE LIST -- Interstellar Scattering Observations of 1849+005 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). Source Source position (RA/Dec) (B1950) (J2000) (Date) * 1849+005 18 49 13.571323 * 18 51 46.720000 18 51 54.771908 00 31 53.29182 * 00 35 32.36600 00 35 47.17073 From catalog imbedded in main SCHED input file. Position from program VM110 J1642+3948 16 41 17.606214 * 16 42 58.809952 16 43 03.952892 1641+399 39 54 10.81489 * 39 48 36.99395 39 48 36.03044 * 3C345 /home/filehost/cwalker/sched/catalogs/sources.vlba J1642+39 ICRF - Ext.1 Source - 1998 IERS Annual Report 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) 1849+005 129.9 3C345 89.3 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