COVER INFORMATION Station: MEDICINA (Code Mc ) 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 MEDICINA (Code Mc ) 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 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 Next BBC frequencies: 331.49 331.49 331.49 331.49 395.49 395.49 395.49 395.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 14 30 00 J0927+3902 07 31 15 67.5 454.1 -2.0 -66.1 0 0 14 30 00 14 35 00 --- 07 36 16 68.4 455.2 -1.9 -65.9 300 39 14 30 01 14 36 10 J0941+4336 07 37 26 67.6 441.5 -2.1 -76.5 48 39 14 36 10 14 38 40 --- 07 39 57 68.0 441.8 -2.0 -76.6 150 58 14 36 11 14 39 20 J0950+4329S 07 40 37 66.5 441.1 -2.2 -75.7 32 58 14 39 20 14 46 00 --- 07 47 18 67.7 441.9 -2.1 -76.2 400 109 14 39 21 14 46 40 J0941+4336 07 47 58 69.4 442.7 -1.9 -77.2 32 109 14 46 40 14 48 40 --- 07 49 58 69.8 442.9 -1.9 -77.3 120 125 14 46 41 14 49 20 J0950+4329S 07 50 39 68.2 442.3 -2.0 -76.4 32 125 14 49 20 14 56 00 --- 07 57 20 69.4 443.0 -1.9 -76.8 400 176 14 49 21 14 56 40 J0941+4336 07 58 00 71.2 443.8 -1.7 -77.8 32 176 14 56 40 14 58 40 --- 08 00 00 71.6 444.1 -1.7 -77.9 120 192 14 56 41 14 59 20 J0950+4329S 08 00 40 70.0 443.4 -1.9 -77.0 32 192 14 59 20 15 06 00 --- 08 07 21 71.2 444.3 -1.7 -77.4 400 243 14 59 21 15 06 40 J0941+4336 08 08 01 73.0 445.1 -1.6 -78.3 32 243 15 06 40 15 08 40 --- 08 10 02 73.3 445.3 -1.5 -78.5 120 259 15 06 41 15 09 20 J0950+4329S 08 10 42 71.8 444.7 -1.7 -77.6 32 259 15 09 20 15 16 00 --- 08 17 23 73.0 445.5 -1.6 -77.9 400 310 15 09 21 15 16 40 J0941+4336 08 18 03 74.8 446.4 -1.4 -78.8 32 310 15 16 40 15 18 40 --- 08 20 03 75.1 446.6 -1.4 -78.9 120 326 15 16 41 15 19 20 J0950+4329S 08 20 43 73.6 446.0 -1.5 -78.1 32 326 15 19 20 15 26 00 --- 08 27 25 74.8 446.9 -1.4 -78.4 400 377 15 19 21 15 26 40 J0941+4336 08 28 05 76.6 447.8 -1.2 -79.2 32 377 15 26 40 15 28 40 --- 08 30 05 76.9 448.1 -1.2 -79.3 120 393 15 26 41 15 29 20 J0950+4329S 08 30 45 75.4 447.3 -1.4 -78.5 32 393 15 29 20 15 36 00 --- 08 37 26 76.6 448.3 -1.2 -78.7 400 444 15 29 21 15 36 40 J0941+4336 08 38 06 78.3 449.3 -1.1 -79.4 32 444 15 36 40 15 38 40 --- 08 40 07 78.7 449.6 -1.0 -79.4 120 460 15 36 41 Schedule for MEDICINA (Code Mc ) 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 08 40 57 77.2 448.9 -1.2 -78.7 42 460 15 39 30 15 45 50 --- 08 47 18 78.3 449.9 -1.1 -78.8 380 509 15 39 31 15 46 40 J0941+4336 08 48 08 80.1 451.1 -0.9 -79.4 42 509 15 46 40 15 48 40 --- 08 50 08 80.5 451.5 -0.9 -79.3 120 524 15 46 41 15 49 30 J0950+4329S 08 50 58 79.0 450.6 -1.0 -78.8 42 524 15 49 30 15 55 50 --- 08 57 19 80.1 451.8 -0.9 -78.6 380 573 15 49 31 15 56 40 J0941+4336 08 58 10 81.9 453.3 -0.7 -78.9 42 573 15 56 40 15 58 40 --- 09 00 10 82.3 453.8 -0.7 -78.8 120 589 15 56 41 15 59 30 J0950+4329S 09 01 00 80.8 452.6 -0.9 -78.5 42 589 15 59 30 16 05 50 --- 09 07 21 81.9 454.2 -0.7 -78.0 380 638 15 59 31 16 06 40 J0941+4336 09 08 11 83.7 456.2 -0.6 -77.8 42 638 16 06 40 16 08 40 --- 09 10 12 84.0 457.0 -0.5 -77.4 120 653 16 06 41 16 09 30 J0950+4329S 09 11 02 82.5 455.2 -0.7 -77.6 42 653 16 09 30 16 15 50 --- 09 17 23 83.7 457.4 -0.6 -76.6 380 702 16 09 31 16 16 40 J0941+4336 09 18 13 85.5 460.8 -0.4 -75.0 42 702 16 16 40 16 18 40 --- 09 20 13 85.8 462.0 -0.4 -74.0 120 718 16 16 41 16 19 50 J0950+4329S 09 21 23 84.4 459.0 -0.5 -75.6 61 718 16 19 50 16 26 10 --- 09 27 44 85.5 462.5 -0.4 -73.2 380 766 16 19 51 16 27 20 J0941+4336 09 28 55 87.3 470.9 -0.2 -66.7 57 766 16 27 20 16 29 20 --- 09 30 55 87.6 474.3 -0.2 -63.6 120 782 16 27 21 16 30 30 J0950+4329S 09 32 05 86.2 465.9 -0.3 -70.6 54 782 16 30 30 16 36 50 --- 09 38 26 87.3 473.9 -0.2 -63.8 380 831 16 30 31 16 48 40 J0941+4336 09 50 18 88.3 593.7 0.1 52.4 640 831 16 48 40 16 50 40 --- 09 52 18 88.0 600.1 0.2 58.5 120 846 16 48 41 16 59 20 J0941+4336 10 01 00 86.6 614.4 0.3 71.2 515 846 16 59 20 17 01 20 --- 10 03 00 86.2 616.2 0.3 72.6 120 862 16 59 21 17 02 30 J0950+4329S 10 04 10 87.5 603.4 0.2 61.3 47 862 17 02 30 17 08 50 --- 10 10 31 86.5 612.6 0.3 69.4 380 911 17 02 31 17 10 00 J0941+4336 10 11 42 84.7 621.5 0.5 76.5 55 911 17 10 00 17 12 00 --- 10 13 42 84.4 622.4 0.5 77.0 120 926 17 10 01 Schedule for MEDICINA (Code Mc ) 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 --- 17 13 10 J0950+4329S 10 14 52 85.7 616.4 0.4 72.5 57 926 17 13 10 17 19 30 --- 10 21 13 84.6 620.2 0.5 75.2 380 975 17 13 11 17 20 40 J0941+4336 10 22 23 82.8 625.4 0.7 78.5 60 975 17 20 40 17 22 40 --- 10 24 24 82.5 625.9 0.7 78.7 120 991 17 20 41 17 23 50 J0950+4329S 10 25 34 83.9 622.2 0.6 76.4 61 991 17 23 50 17 30 10 --- 10 31 55 82.7 624.4 0.7 77.5 380 1040 17 23 51 17 31 20 J0941+4336 10 33 05 80.9 628.0 0.8 79.2 62 1040 17 31 20 17 33 20 --- 10 35 05 80.6 628.4 0.9 79.3 120 1055 17 31 21 17 34 30 J0950+4329S 10 36 16 82.0 625.7 0.7 78.0 62 1055 17 34 30 17 40 50 --- 10 42 37 80.8 627.3 0.8 78.5 380 1104 17 34 31 17 42 00 J0941+4336 10 43 47 79.0 630.1 1.0 79.4 62 1104 17 42 00 17 44 00 --- 10 45 47 78.7 630.4 1.0 79.4 120 1119 17 42 01 17 44 55 J0950+4329S 10 46 42 80.1 628.1 0.9 78.6 47 1119 17 44 55 17 51 05 --- 10 52 53 79.0 629.4 1.0 78.8 370 1167 17 44 56 17 52 00 J0941+4336 10 53 49 77.2 631.7 1.2 79.3 47 1167 17 52 00 17 54 00 --- 10 55 49 76.9 632.0 1.2 79.3 120 1183 17 52 01 17 54 55 J0950+4329S 10 56 44 78.3 630.1 1.1 78.8 47 1183 17 54 55 18 01 05 --- 11 02 55 77.2 631.1 1.2 78.7 370 1230 17 54 56 18 02 00 J0941+4336 11 03 50 75.4 633.1 1.4 79.0 47 1230 18 02 00 18 04 00 --- 11 05 50 75.1 633.4 1.4 78.9 120 1246 18 02 01 18 04 55 J0950+4329S 11 06 46 76.5 631.7 1.2 78.7 47 1246 18 04 55 18 11 05 --- 11 12 57 75.4 632.6 1.3 78.5 370 1293 18 04 56 18 12 00 J0941+4336 11 13 52 73.7 634.5 1.5 78.5 47 1293 18 12 00 18 14 00 --- 11 15 52 73.3 634.7 1.6 78.4 120 1309 18 12 01 18 14 55 J0950+4329S 11 16 47 74.7 633.2 1.4 78.4 47 1309 18 14 55 18 21 05 --- 11 22 58 73.6 634.0 1.5 78.1 370 1356 18 14 56 18 22 00 J0941+4336 11 23 53 71.9 635.7 1.7 78.0 47 1356 18 22 00 18 24 00 --- 11 25 54 71.5 636.0 1.7 77.9 120 1372 18 22 01 18 24 45 J0950+4329S 11 26 39 73.0 634.5 1.6 77.9 37 1372 18 24 45 18 31 15 --- 11 33 10 71.8 635.3 1.7 77.6 390 1422 18 24 46 Schedule for MEDICINA (Code Mc ) 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 32 00 J0941+4336 11 33 55 70.1 636.9 1.9 77.4 37 1422 18 32 00 18 34 00 --- 11 35 55 69.7 637.1 1.9 77.3 120 1438 18 32 01 18 34 45 J0950+4329S 11 36 41 71.2 635.7 1.7 77.4 37 1438 18 34 45 18 41 15 --- 11 43 12 70.1 636.5 1.9 77.0 390 1488 18 34 46 18 42 00 J0941+4336 11 43 57 68.3 638.0 2.0 76.7 37 1488 18 42 00 18 44 00 --- 11 45 57 68.0 638.3 2.1 76.6 120 1503 18 42 01 18 44 45 J0950+4329S 11 46 42 69.4 636.9 1.9 76.8 37 1503 18 44 45 18 51 15 --- 11 53 13 68.3 637.7 2.0 76.4 390 1554 18 44 46 18 52 00 J0941+4336 11 53 58 66.6 639.2 2.2 76.1 37 1554 18 52 00 18 54 00 --- 11 55 59 66.2 639.4 2.2 75.9 120 1569 18 52 01 18 54 45 J0950+4329S 11 56 44 67.7 638.1 2.1 76.2 37 1569 18 54 45 19 01 15 --- 12 03 15 66.5 638.8 2.2 75.8 390 1619 18 54 46 19 02 00 J0941+4336 12 04 00 64.8 640.3 2.4 75.3 37 1619 19 02 00 19 04 00 --- 12 06 00 64.4 640.5 2.4 75.2 120 1635 19 02 01 19 04 45 J0950+4329S 12 06 45 65.9 639.2 2.2 75.5 37 1635 19 04 45 19 11 15 --- 12 13 17 64.8 640.0 2.4 75.0 390 1685 19 04 46 19 12 00 J0941+4336 12 14 02 63.0 641.3 2.5 74.6 37 1685 19 12 00 19 14 00 --- 12 16 02 62.7 641.5 2.6 74.4 120 1700 19 12 01 19 14 45 J0950+4329S 12 16 47 64.1 640.3 2.4 74.8 37 1700 19 14 45 19 21 15 --- 12 23 18 63.0 641.1 2.5 74.3 390 1751 19 14 46 19 22 00 J0941+4336 12 24 03 61.3 642.4 2.7 73.8 37 1751 19 22 00 19 24 00 --- 12 26 04 60.9 642.6 2.7 73.6 120 1766 19 22 01 19 25 00 J0956+2515 12 27 04 54.3 609.7 2.5 47.6 12 1766 19 25 00 19 30 00 =OK290 12 32 05 53.4 611.0 2.6 48.1 300 1805 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: 7 Station: MEDICINA 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= 1295.00 1295.00 1295.00 1295.00 1295.00 1295.00 1295.00 1295.00 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: 4 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= 331.49 331.49 331.49 331.49 395.49 395.49 395.49 395.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 4 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) * 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