COVER INFORMATION Station: HART (Code Hh ) Experiment: Varstrometry selected dual-Quasar candidates Exp. Code: EX010A Schedule Version: 2.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Wancheng Xu Address: Xinjiang Astronomical Observatory, CAS 150 Science-1 Street Urumqi China Phone: +8615141589572 EMAIL: xuwancheng@xao.ac.cn Fax: Phone during observation: +8615141589572 Observing mode: vlbi Notes: # Please, make sure PHASE CAL is OFF # COVER LETTER: The coordinates of calibrators are from Astrogeo Database (rfc_2023c). Schedule for HART (Code Hh ) Page 2 Varstrometry selected dual-Quasar candidates 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 ---------------------------------------------------------------------------------------- --- Fri 24 May 2024 Day 145 --- Next scan frequencies: 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 Next BBC frequencies: 116.49 116.49 116.49 116.49 180.49 180.49 180.49 180.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 06 30 00 J2253+1608 00 30 09 41.9 328.7 1.6 0.0 0 0 06 30 00 06 35 00 --- 00 35 10 41.3 327.3 1.7 0.0 300 39 06 30 01 06 38 30 J0111+1713SW 00 38 41 46.0 11.7 -0.6 0.0 115 39 06 38 30 06 45 00 --- 00 45 12 46.3 9.4 -0.5 0.0 390 89 06 38 31 06 45 30 J0111+1713SW 00 45 42 46.3 9.3 -0.4 0.0 9 89 06 45 30 06 58 00 --- 00 58 14 46.6 5.0 -0.2 0.0 750 185 06 45 31 06 58 30 J0111+1713SW 00 58 44 46.6 4.8 -0.2 0.0 9 185 06 58 30 07 11 00 --- 01 11 16 46.8 0.4 -0.0 0.0 750 282 06 58 31 07 11 30 J0111+1713SW 01 11 46 46.8 0.3 -0.0 0.0 9 282 07 11 30 07 24 00 --- 01 24 18 46.7 355.9 0.2 0.0 750 379 07 11 31 07 24 30 J0111+1713SW 01 24 48 46.7 355.7 0.2 0.0 9 379 07 24 30 07 37 00 --- 01 37 20 46.3 351.4 0.4 0.0 750 475 07 24 31 07 37 30 J0111+1713SW 01 37 50 46.3 351.2 0.4 0.0 9 475 07 37 30 07 50 00 --- 01 50 22 45.8 347.0 0.6 0.0 750 572 07 37 31 07 50 30 J0111+1713SW 01 50 52 45.8 346.8 0.6 0.0 9 572 07 50 30 08 03 00 --- 02 03 24 45.0 342.7 0.8 0.0 750 669 07 50 31 08 03 30 J0111+1713SW 02 03 55 45.0 342.5 0.9 0.0 9 669 08 03 30 08 16 00 --- 02 16 27 44.1 338.6 1.1 0.0 750 765 08 03 31 08 16 30 J0111+1713SW 02 16 57 44.0 338.4 1.1 0.0 9 765 08 16 30 08 29 00 --- 02 29 29 42.9 334.6 1.3 0.0 750 862 08 16 31 08 29 30 J0111+1713SW 02 29 59 42.8 334.4 1.3 0.0 9 862 08 29 30 08 42 00 --- 02 42 31 41.5 330.8 1.5 0.0 750 958 08 29 31 08 42 30 J0111+1713SW 02 43 01 41.5 330.7 1.5 0.0 9 958 08 42 30 08 55 00 --- 02 55 33 40.0 327.2 1.7 0.0 750 1055 08 42 31 08 55 30 J0111+1713SW 02 56 03 40.0 327.1 1.7 0.0 9 1055 08 55 30 09 08 00 --- 03 08 35 38.4 323.8 1.9 0.0 750 1152 08 55 31 09 08 30 J0111+1713SW 03 09 05 38.3 323.7 1.9 0.0 9 1152 09 08 30 09 21 00 --- 03 21 37 36.6 320.6 2.2 0.0 750 1248 09 08 31 Schedule for HART (Code Hh ) Page 3 Varstrometry selected dual-Quasar candidates 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 ---------------------------------------------------------------------------------------- --- Fri 24 May 2024 Day 145 --- 09 25 00 J2253+1608 03 25 38 11.9 294.9 4.5 0.0 144 1248 09 25 00 09 30 00 --- 03 30 39 10.9 294.2 4.6 0.0 300 1287 09 25 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess224.L1024 Matching groups in /home/guest/rmc/SCHED/sched11.6/catalogs/freq_RDBE.dat: hh18cm Values confirmed by E-mail Jonathan Quick 20140219 (CR) ****** Only 122.49 of 256.00 MHz total bandwidth is within the IFs in the setup file before any FREQ or DOPPLER shifts. Setup group: 5 Station: HART Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 1510.00 1510.00 1510.00 1510.00 1510.00 1510.00 1510.00 1510.00 Net SB= L L U U L L U U IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 2 10 2 10 BBC SB= L L U U L L U U IF = A1 C1 A1 C1 A1 C1 A1 C1 The following frequency sets based on these setups were used. Frequency Set: 8 Setup file default. Used with PCAL = off LO sum= 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 BBC fr= 116.49 116.49 116.49 116.49 180.49 180.49 180.49 180.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 8 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * J0111+1713SW 01 08 34.437928 * 01 11 14.370000 01 12 31.069933 0.00 16 57 32.15933 * 17 13 27.96000 17 21 05.87517 0.00 From catalog imbedded in main SCHED input file. * J2253+1608 22 51 29.519751 * 22 53 57.747950 22 55 09.420708 0.00 15 52 54.34811 * 16 08 53.56094 16 16 29.33763 0.00 From catalog imbedded in main SCHED input file. SOURCE SCAN SUMMARY FOR SOURCES LISTED ABOVE Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Setup file Frequency sets Observing hours (duplicates not shown) Scan Baseline J0111+1713Ssess224.L1024 1 2 3 4 5 6 7 8 9 10 2.608 237.358 J2253+1608 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.167 15.167 EFFECT OF SOLAR CORONA 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) J0111+1713SW 41.1 J2253+1608 73.2 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