COVER INFORMATION Station: VLBA_NL (Code Nl ) Experiment: Test of the VLA Exp. Code: TV007b Schedule Version: 1.00 Processed by SCHED version: 6.02 July 2005 PI: M. Claussen Address: National Radio Astronomy Observatory P. O. Box O Socorro, New Mexico, 87801 U.S.A. Phone: 505 835 7284 EMAIL: mclausse@nrao.edu Fax: 505 835 7027 Phone during observation: 505 835 7284 Observing mode: Continuum Notes: Schedule for VLBA_NL (Code Nl ) Page 2 Test of the VLA 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). 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 ---------------------------------------------------------------------------------------- --- Tue 18 Apr 2006 Day 108 --- Next scan frequencies: 4971.49 4971.49 4979.49 4979.49 4987.49 4987.49 4995.49 4995.49 Next BBC frequencies: 871.49 871.49 879.49 879.49 887.49 887.49 895.49 895.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 15 53 59 3C454.3 23 34 11 63.0 201.5 0.7 16.5 0 1 1 0 15 53 59 16 03 57 --- 23 44 11 62.2 206.5 0.8 20.3 598 F 1 3989 15 54 12 16 03 57 J2253+1942 23 44 11 65.5 209.9 0.8 23.3 -12 1 1 3989 16 03 57 16 08 56 =2250+194 23 49 11 65.0 212.4 0.9 25.2 287 F 1 5984 16 03 57 16 08 56 3C454.3 23 49 11 61.8 208.9 0.9 22.0 -12 1 1 5984 16 08 56 16 18 55 --- 23 59 11 60.8 213.4 1.1 25.3 586 F 1 9973 16 08 56 16 18 55 J2253+1942 23 59 11 63.9 217.3 1.1 28.7 -12 1 1 9973 16 18 55 16 23 54 =2250+194 00 04 11 63.4 219.6 1.2 30.4 287 F 1 11967 16 18 55 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: /export/home/corvus/mclausse/Sched/setups/v6cm-128-8-1.set Matches group v6cm_2 in /export/home/corvus/mclausse/Sched/catalogs/freq.dat Setup group: 1 Station: VLBA_NL 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 used at high density at 80.000 ips. Time per pass is 44.00 minutes. 1st LO= 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 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= U U U U U U U U IF = A C A C A C A C VLBA FE= 6cm omit 6cm omit VLBA Synth= 15.4 4.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 1 Setup file default. Used pcal sets: 1 LO sum= 4971.49 4971.49 4979.49 4979.49 4987.49 4987.49 4995.49 4995.49 BBC fr= 871.49 871.49 879.49 879.49 887.49 887.49 895.49 895.49 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 -- Test of the VLA 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) J2253+1608 22 51 29.519743 * 22 53 57.747942 22 54 15.202270 0.31 2251+158 15 52 54.34803 * 16 08 53.56086 16 10 40.41897 0.20 * 3C454.3 /export/home/corvus/mclausse/Sched/catalogs/sources.vlba J2253+16 VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.332 scan hours, 1.962 baseline hours above horizon. * J2253+1942 22 50 40.548726 * 22 53 07.369173 22 53 24.594434 0.32 2250+194 19 26 36.48777 * 19 42 34.62877 19 44 20.63283 0.21 /export/home/corvus/mclausse/Sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.166 scan hours, 0.933 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) 3C454.3 42.0 J2253+1942 42.4 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