COVER INFORMATION Station: DARNHALL (Code Da ) Experiment: Varstrometry selected dual-Quasar candidates Exp. Code: EX010B 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 DARNHALL (Code Da ) 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 ---------------------------------------------------------------------------------------- --- Sat 25 May 2024 Day 146 --- Next scan frequencies: 1626.49 1626.49 Next BBC frequencies: 645.51 645.51 Next scan bandwidths: 64.00 64.00 14 30 00 J0927+3902 06 34 32 57.3 97.9 -2.9 -49.8 0 0 14 30 00 14 35 00 --- 06 39 32 58.0 99.1 -2.8 -49.6 300 19 14 30 01 14 36 10 J0941+4336 06 40 43 58.8 89.3 -3.0 -55.8 18 19 14 36 10 14 38 40 --- 06 43 13 59.2 89.8 -3.0 -55.8 150 29 14 36 11 14 39 20 J0950+4329S 06 43 53 57.8 88.3 -3.1 -55.5 18 29 14 39 20 14 46 00 --- 06 50 34 58.8 89.7 -3.0 -55.6 400 55 14 39 21 14 46 40 J0941+4336 06 51 14 60.4 91.4 -2.9 -55.7 17 55 14 46 40 14 48 40 --- 06 53 15 60.7 91.9 -2.8 -55.7 120 62 14 46 41 14 49 20 J0950+4329S 06 53 55 59.4 90.3 -3.0 -55.6 18 62 14 49 20 14 56 00 --- 07 00 36 60.4 91.7 -2.9 -55.5 400 88 14 49 21 14 56 40 J0941+4336 07 01 16 61.9 93.6 -2.7 -55.6 17 88 14 56 40 14 58 40 --- 07 03 16 62.2 94.0 -2.7 -55.6 120 96 14 56 41 14 59 20 J0950+4329S 07 03 56 60.9 92.4 -2.8 -55.5 17 96 14 59 20 15 06 00 --- 07 10 37 61.9 93.8 -2.7 -55.4 400 122 14 59 21 15 06 40 J0941+4336 07 11 18 63.4 95.8 -2.5 -55.3 16 122 15 06 40 15 08 40 --- 07 13 18 63.7 96.3 -2.5 -55.3 120 129 15 06 41 15 09 20 J0950+4329S 07 13 58 62.4 94.6 -2.6 -55.3 17 129 15 09 20 15 16 00 --- 07 20 39 63.4 96.1 -2.5 -55.1 400 155 15 09 21 15 16 40 J0941+4336 07 21 19 64.9 98.2 -2.4 -54.9 15 155 15 16 40 15 18 40 --- 07 23 20 65.2 98.7 -2.3 -54.8 120 163 15 16 41 15 19 20 J0950+4329S 07 24 00 63.8 96.9 -2.5 -55.0 16 163 15 19 20 15 26 00 --- 07 30 41 64.8 98.5 -2.4 -54.7 400 189 15 19 21 15 26 40 J0941+4336 07 31 21 66.4 100.7 -2.2 -54.3 15 189 15 26 40 15 28 40 --- 07 33 21 66.7 101.3 -2.2 -54.2 120 196 15 26 41 15 29 20 J0950+4329S 07 34 01 65.3 99.3 -2.3 -54.5 15 196 15 29 20 15 36 00 --- 07 40 42 66.3 101.0 -2.2 -54.1 400 222 15 29 21 15 36 40 J0941+4336 07 41 22 67.9 103.5 -2.0 -53.5 14 222 15 36 40 15 38 40 --- 07 43 23 68.1 104.1 -2.0 -53.3 120 230 15 36 41 Schedule for DARNHALL (Code Da ) 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 ---------------------------------------------------------------------------------------- --- Sat 25 May 2024 Day 146 --- 15 39 30 J0950+4329S 07 44 13 66.8 102.0 -2.1 -53.8 24 230 15 39 30 15 45 50 --- 07 50 34 67.8 103.8 -2.0 -53.2 380 254 15 39 31 15 46 40 J0941+4336 07 51 24 69.3 106.5 -1.9 -52.4 22 254 15 46 40 15 48 40 --- 07 53 24 69.6 107.1 -1.8 -52.2 120 262 15 46 41 15 49 30 J0950+4329S 07 54 15 68.3 104.8 -2.0 -52.9 23 262 15 49 30 15 55 50 --- 08 00 36 69.2 106.8 -1.9 -52.2 380 287 15 49 31 15 56 40 J0941+4336 08 01 26 70.7 109.8 -1.7 -51.1 21 287 15 56 40 15 58 40 --- 08 03 26 71.0 110.5 -1.7 -50.8 120 294 15 56 41 15 59 30 J0950+4329S 08 04 16 69.7 108.0 -1.8 -51.7 22 294 15 59 30 16 05 50 --- 08 10 37 70.6 110.1 -1.7 -50.8 380 319 15 59 31 16 06 40 J0941+4336 08 11 27 72.1 113.4 -1.5 -49.3 20 319 16 06 40 16 08 40 --- 08 13 28 72.4 114.2 -1.5 -48.9 120 327 16 06 41 16 09 30 J0950+4329S 08 14 18 71.2 111.4 -1.6 -50.2 21 327 16 09 30 16 15 50 --- 08 20 39 72.0 113.8 -1.5 -49.0 380 351 16 09 31 16 16 40 J0941+4336 08 21 29 73.5 117.5 -1.4 -47.1 18 351 16 16 40 16 18 40 --- 08 23 29 73.8 118.4 -1.3 -46.6 120 359 16 16 41 16 19 50 J0950+4329S 08 24 40 72.6 115.3 -1.5 -48.2 39 359 16 19 50 16 26 10 --- 08 31 01 73.4 118.0 -1.4 -46.7 380 383 16 19 51 16 27 20 J0941+4336 08 32 11 74.9 122.5 -1.2 -44.2 36 383 16 27 20 16 29 20 --- 08 34 11 75.1 123.5 -1.1 -43.6 120 391 16 27 21 16 30 30 J0950+4329S 08 35 21 74.0 120.0 -1.3 -45.6 37 391 16 30 30 16 36 50 --- 08 41 42 74.8 123.0 -1.2 -43.8 380 415 16 30 31 16 38 00 J0941+4336 08 42 53 76.2 128.3 -1.0 -40.5 33 415 16 38 00 16 40 00 --- 08 44 53 76.4 129.4 -1.0 -39.7 120 423 16 38 01 16 41 10 J0950+4329S 08 46 03 75.4 125.3 -1.1 -42.3 34 423 16 41 10 16 47 30 --- 08 52 24 76.1 128.8 -1.0 -40.0 380 448 16 41 11 16 48 40 J0941+4336 08 53 34 77.4 134.9 -0.8 -35.8 30 448 16 48 40 16 50 40 --- 08 55 35 77.6 136.3 -0.8 -34.8 120 455 16 48 41 16 51 50 J0950+4329S 08 56 45 76.6 131.4 -0.9 -38.2 32 455 16 51 50 16 58 10 --- 09 03 06 77.3 135.5 -0.8 -35.3 380 480 16 51 51 Schedule for DARNHALL (Code Da ) Page 4 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 ---------------------------------------------------------------------------------------- --- Sat 25 May 2024 Day 146 --- 16 59 20 J0941+4336 09 04 16 78.4 142.7 -0.6 -30.1 27 480 16 59 20 17 01 20 --- 09 06 16 78.6 144.3 -0.6 -28.8 120 488 16 59 21 17 02 30 J0950+4329S 09 07 27 77.8 138.5 -0.7 -33.1 29 488 17 02 30 17 08 50 --- 09 13 48 78.4 143.3 -0.6 -29.6 380 512 17 02 31 17 10 00 J0941+4336 09 14 58 79.3 151.7 -0.5 -23.1 23 512 17 10 00 17 12 00 --- 09 16 58 79.4 153.5 -0.4 -21.6 120 520 17 10 01 17 13 10 J0950+4329S 09 18 08 78.7 146.8 -0.6 -26.9 26 520 17 13 10 17 19 30 --- 09 24 29 79.2 152.2 -0.5 -22.6 380 544 17 13 11 17 20 40 J0941+4336 09 25 40 79.9 161.9 -0.3 -14.9 19 544 17 20 40 17 22 40 --- 09 27 40 80.0 163.9 -0.3 -13.2 120 552 17 20 41 17 23 50 J0950+4329S 09 28 50 79.5 156.2 -0.4 -19.4 23 552 17 23 50 17 30 10 --- 09 35 11 79.8 162.4 -0.3 -14.5 380 576 17 23 51 17 31 20 J0941+4336 09 36 21 80.3 173.0 -0.1 -5.8 16 576 17 31 20 17 33 20 --- 09 38 22 80.3 175.2 -0.1 -4.0 120 584 17 31 21 17 34 30 J0950+4329S 09 39 32 80.0 166.8 -0.2 -10.9 21 584 17 34 30 17 40 50 --- 09 45 53 80.2 173.4 -0.1 -5.4 380 609 17 34 31 17 42 00 J0941+4336 09 47 03 80.3 184.6 0.1 3.8 15 609 17 42 00 17 44 00 --- 09 49 03 80.3 186.7 0.1 5.6 120 616 17 42 01 17 44 55 J0950+4329S 09 49 59 80.2 177.8 -0.0 -1.8 5 616 17 44 55 17 51 05 --- 09 56 10 80.2 184.4 0.1 3.6 370 640 17 44 56 17 52 00 J0941+4336 09 57 05 80.1 195.2 0.2 12.5 0 640 17 52 00 17 54 00 --- 09 59 05 80.0 197.2 0.3 14.2 120 648 17 52 01 17 54 55 J0950+4329S 10 00 00 80.1 188.5 0.1 7.0 6 648 17 54 55 18 01 05 --- 10 06 11 79.9 194.9 0.2 12.2 370 672 17 54 56 18 02 00 J0941+4336 10 07 06 79.5 205.0 0.4 20.5 2 672 18 02 00 18 04 00 --- 10 09 07 79.4 206.9 0.4 21.9 120 680 18 02 01 18 04 55 J0950+4329S 10 10 02 79.8 198.7 0.3 15.4 7 680 18 04 55 18 11 05 --- 10 16 13 79.4 204.7 0.4 20.1 370 703 18 04 56 18 12 00 J0941+4336 10 17 08 78.8 213.9 0.6 27.4 5 703 18 12 00 18 14 00 --- 10 19 08 78.6 215.5 0.6 28.7 120 711 18 12 01 Schedule for DARNHALL (Code Da ) Page 5 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 ---------------------------------------------------------------------------------------- --- Sat 25 May 2024 Day 146 --- 18 14 55 J0950+4329S 10 20 03 79.2 208.2 0.5 22.9 10 711 18 14 55 18 21 05 --- 10 26 14 78.7 213.5 0.6 27.1 370 735 18 14 56 18 22 00 J0941+4336 10 27 10 77.9 221.7 0.7 33.3 8 735 18 22 00 18 24 00 --- 10 29 10 77.7 223.1 0.8 34.4 120 743 18 22 01 18 24 45 J0950+4329S 10 29 55 78.4 216.4 0.6 29.3 2 743 18 24 45 18 31 15 --- 10 36 26 77.8 221.3 0.7 33.0 390 768 18 24 46 18 32 00 J0941+4336 10 37 11 76.8 228.4 0.9 38.2 1 768 18 32 00 18 34 00 --- 10 39 12 76.6 229.6 0.9 39.0 120 775 18 32 01 18 34 45 J0950+4329S 10 39 57 77.4 223.8 0.8 34.8 5 775 18 34 45 18 41 15 --- 10 46 28 76.7 228.1 0.9 37.9 390 801 18 34 46 18 42 00 J0941+4336 10 47 13 75.6 234.2 1.1 42.1 4 801 18 42 00 18 44 00 --- 10 49 13 75.4 235.3 1.1 42.8 120 808 18 42 01 18 44 45 J0950+4329S 10 49 58 76.3 230.2 1.0 39.3 7 808 18 44 45 18 51 15 --- 10 56 29 75.5 233.9 1.1 41.8 390 833 18 44 46 18 52 00 J0941+4336 10 57 15 74.4 239.3 1.2 45.3 6 833 18 52 00 18 54 00 --- 10 59 15 74.1 240.3 1.3 45.9 120 841 18 52 01 18 54 45 J0950+4329S 11 00 00 75.1 235.8 1.1 43.0 9 841 18 54 45 19 01 15 --- 11 06 31 74.3 239.0 1.2 45.0 390 866 18 54 46 19 02 00 J0941+4336 11 07 16 73.1 243.8 1.4 47.9 9 866 19 02 00 19 04 00 --- 11 09 17 72.8 244.6 1.4 48.3 120 874 19 02 01 19 04 45 J0950+4329S 11 10 02 73.8 240.6 1.3 46.0 11 874 19 04 45 19 11 15 --- 11 16 33 73.0 243.5 1.4 47.6 390 899 19 04 46 19 12 00 J0941+4336 11 17 18 71.7 247.7 1.6 49.9 11 899 19 12 00 19 14 00 --- 11 19 18 71.4 248.5 1.6 50.3 120 907 19 12 01 19 14 45 J0950+4329S 11 20 03 72.5 244.9 1.5 48.3 13 907 19 14 45 19 21 15 --- 11 26 34 71.6 247.4 1.6 49.6 390 932 19 14 46 19 22 00 J0941+4336 11 27 19 70.3 251.3 1.7 51.5 12 932 19 22 00 19 24 00 --- 11 29 20 70.0 251.9 1.8 51.8 120 940 19 22 01 19 25 00 J0956+2515 11 30 20 57.1 220.7 1.5 25.6 -56 940 19 25 00 19 30 00 =OK290 11 35 21 56.6 222.5 1.6 26.6 244 959 19 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 --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 11 Station: DARNHALL Total bit rate: 512 Format: VDIF Bits per sample: 2 Sample rate:128.000 Number of channels: 2 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 2272.00 2272.00 Net SB= U U IF SB = L L Pol. = RCP LCP BBC = 1 9 BBC SB= L L IF = A1 B1 The following frequency sets based on these setups were used. Frequency Set: 10 Setup file default. Used with PCAL = off LO sum= 1626.49 1626.49 BBC fr= 645.51 645.51 Bandwd= 64.00 64.00 Matching frequency sets: 10 11 12 13 14 Track assignments are: track1= 1, 2 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * J0950+4329S 09 47 23.456394 * 09 50 31.630000 09 52 02.913973 0.00 43 43 10.80497 * 43 29 08.26000 43 22 31.49947 0.00 From catalog imbedded in main SCHED input file. * J0927+3902 09 23 55.319223 * 09 27 03.013944 09 28 33.880359 0.00 39 15 23.56637 * 39 02 20.85177 38 56 11.90638 0.00 From catalog imbedded in main SCHED input file. * J0941+4336 09 38 06.240392 * 09 41 16.707942 09 42 49.023018 0.00 43 50 29.00062 * 43 36 49.06097 43 30 23.32098 0.00 From catalog imbedded in main SCHED input file. OK290 09 53 59.738482 * 09 56 49.875376 09 58 12.440319 0.41 * J0956+2515 25 29 33.58581 * 25 15 16.04991 25 08 26.43478 0.37 0953+254 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J0956+25 GSFC 2016a X/S astro solution, 26975 observations. 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 J0950+4329Ssess224.L1024 1 2 3 4 5 6 7 8 9 10 2.994 264.109 J0927+3902 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.083 7.583 J0941+4336 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.975 86.032 J0956+2515 sess224.L1024 1 2 3 4 6 7 8 9 10 0.083 5.447 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) J0950+4329S 72.1 J0927+3902 68.7 J0941+4336 70.5 J0956+2515 78.2 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