COVER INFORMATION Station: HART (Code Hh ) Experiment: 3.6cm global VLBI observations of Arp220 Exp. Code: GV023 Schedule Version: 2.00 Processed by SCHED version: 11.40 Release 11.4. March 14, 2015 PI: Eskil Varenius Address: Jodrell Bank Observatory, The University of Manchester Lower Withington, Macclesfield Cheshire, SK11 9DL UK Phone: +46706755341 EMAIL: eskil.varenius@manchester.ac.uk Fax: Phone during observation: +46706755341 Observing mode: 3.6cm 2Gbps global VLBI (EVN+VLBA) Notes: Phase calibrator: J1532+2344 Fringe finder / pol. cal / bandpass cal: J1516+1932 Schedule for HART (Code Hh ) Page 2 3.6cm global VLBI observations of Arp220 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 20 Oct 2017 Day 293 --- Next scan frequencies: 8272.00 8272.00 8272.00 8272.00 8336.00 8336.00 8336.00 8336.00 8400.00 8400.00 8400.00 8400.00 8464.00 8464.00 8464.00 8464.00 Next BBC frequencies: 192.00 192.00 192.00 192.00 256.00 256.00 256.00 256.00 320.00 320.00 320.00 320.00 384.00 384.00 384.00 384.00 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 12 00 00 J1516+1932 15 47 18 44.1 350.3 0.5 0.0 0 0 12 00 00 12 03 00 =1514+197 15 50 19 43.9 349.3 0.5 0.0 180 46 12 00 01 12 04 01 J1532+2344 15 51 20 40.2 354.7 0.3 0.0 26 46 12 04 01 12 05 51 =1530+239 15 53 20 40.2 354.1 0.3 0.0 110 75 12 04 02 12 06 17 ARP220 15 53 36 40.5 354.6 0.3 0.0 0 75 12 06 17 12 10 17 --- 15 57 37 40.4 353.4 0.4 0.0 240 137 12 06 18 12 10 53 J1532+2344 15 58 12 40.1 352.6 0.4 0.0 10 137 12 10 53 12 12 43 =1530+239 16 00 13 40.0 352.0 0.4 0.0 110 165 12 10 54 12 13 08 ARP220 16 00 28 40.3 352.5 0.4 0.0 0 165 12 13 08 12 17 08 --- 16 04 29 40.2 351.3 0.5 0.0 240 227 12 13 09 12 17 44 J1532+2344 16 05 05 39.8 350.6 0.5 0.0 10 227 12 17 44 12 19 34 =1530+239 16 07 05 39.8 350.0 0.6 0.0 110 255 12 17 45 12 20 00 ARP220 16 07 21 40.1 350.5 0.5 0.0 0 255 12 20 00 12 24 00 --- 16 11 22 39.9 349.3 0.6 0.0 240 317 12 20 01 12 24 35 J1532+2344 16 11 57 39.6 348.6 0.6 0.0 10 317 12 24 35 12 26 25 =1530+239 16 13 58 39.5 348.0 0.7 0.0 110 345 12 24 36 12 26 51 ARP220 16 14 13 39.8 348.5 0.6 0.0 0 345 12 26 51 12 30 51 --- 16 18 14 39.6 347.3 0.7 0.0 240 407 12 26 52 12 31 27 J1532+2344 16 18 50 39.2 346.6 0.8 0.0 10 407 12 31 27 12 33 17 =1530+239 16 20 50 39.1 346.0 0.8 0.0 110 435 12 31 28 12 33 42 ARP220 16 21 06 39.5 346.5 0.8 0.0 0 435 12 33 42 12 37 42 --- 16 25 06 39.2 345.3 0.8 0.0 240 497 12 33 43 12 38 18 J1532+2344 16 25 42 38.8 344.6 0.9 0.0 10 497 12 38 18 12 40 08 =1530+239 16 27 42 38.7 344.0 0.9 0.0 110 526 12 38 19 12 40 33 ARP220 16 27 58 39.1 344.5 0.9 0.0 0 526 12 40 33 12 44 33 --- 16 31 59 38.8 343.4 0.9 0.0 240 587 12 40 34 Schedule for HART (Code Hh ) Page 3 3.6cm global VLBI observations of Arp220 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 20 Oct 2017 Day 293 --- 12 45 09 J1532+2344 16 32 35 38.4 342.7 1.0 0.0 10 587 12 45 09 12 46 59 =1530+239 16 34 35 38.3 342.1 1.0 0.0 110 616 12 45 10 12 47 25 ARP220 16 34 51 38.6 342.6 1.0 0.0 0 616 12 47 25 12 51 25 --- 16 38 51 38.3 341.4 1.1 0.0 240 678 12 47 26 12 52 00 J1532+2344 16 39 27 37.9 340.8 1.1 0.0 10 678 12 52 00 12 53 50 =1530+239 16 41 27 37.8 340.2 1.1 0.0 110 706 12 52 01 12 54 16 ARP220 16 41 43 38.1 340.6 1.1 0.0 0 706 12 54 16 12 58 16 --- 16 45 44 37.8 339.5 1.2 0.0 240 768 12 54 17 ---------- BLOCK 1 FINISHED ---------- 12 59 08 J1516+1932 16 46 36 39.8 332.4 1.5 0.0 16 768 12 59 08 13 02 08 =1514+197 16 49 36 39.4 331.5 1.5 0.0 180 814 12 59 09 13 03 05 J1532+2344 16 50 33 37.0 337.8 1.3 0.0 22 814 13 03 05 13 04 55 =1530+239 16 52 34 36.9 337.2 1.3 0.0 110 842 13 03 06 13 05 20 ARP220 16 52 49 37.2 337.6 1.3 0.0 0 842 13 05 20 13 09 20 --- 16 56 50 36.9 336.6 1.4 0.0 240 904 13 05 21 13 09 56 J1532+2344 16 57 26 36.4 335.9 1.4 0.0 10 904 13 09 56 13 11 46 =1530+239 16 59 26 36.2 335.4 1.4 0.0 110 933 13 09 57 13 12 12 ARP220 16 59 42 36.6 335.8 1.4 0.0 0 933 13 12 12 13 16 12 --- 17 03 42 36.3 334.8 1.5 0.0 240 994 13 12 13 13 16 47 J1532+2344 17 04 18 35.8 334.2 1.5 0.0 10 994 13 16 47 13 18 37 =1530+239 17 06 18 35.6 333.7 1.5 0.0 110 1023 13 16 48 13 19 03 ARP220 17 06 34 36.0 334.0 1.5 0.0 0 1023 13 19 03 13 23 03 --- 17 10 35 35.6 333.0 1.6 0.0 240 1085 13 19 04 13 23 39 J1532+2344 17 11 11 35.1 332.4 1.6 0.0 10 1085 13 23 39 13 25 29 =1530+239 17 13 11 34.9 331.9 1.7 0.0 110 1113 13 23 40 13 25 54 ARP220 17 13 27 35.3 332.3 1.6 0.0 0 1113 13 25 54 13 29 54 --- 17 17 27 34.9 331.3 1.7 0.0 240 1175 13 25 55 13 30 30 J1532+2344 17 18 03 34.4 330.8 1.7 0.0 10 1175 13 30 30 13 32 20 =1530+239 17 20 03 34.1 330.3 1.8 0.0 110 1203 13 30 31 Schedule for HART (Code Hh ) Page 4 3.6cm global VLBI observations of Arp220 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 20 Oct 2017 Day 293 --- 13 32 46 ARP220 17 20 19 34.5 330.6 1.7 0.0 0 1203 13 32 46 13 36 46 --- 17 24 20 34.1 329.6 1.8 0.0 240 1265 13 32 47 13 37 21 J1532+2344 17 24 55 33.6 329.1 1.9 0.0 10 1265 13 37 21 13 39 11 =1530+239 17 26 56 33.3 328.6 1.9 0.0 110 1293 13 37 22 13 39 37 ARP220 17 27 11 33.8 328.9 1.9 0.0 0 1293 13 39 37 13 43 37 --- 17 31 12 33.3 328.0 1.9 0.0 240 1355 13 39 38 13 44 13 J1532+2344 17 31 48 32.8 327.5 2.0 0.0 10 1355 13 44 13 13 46 03 =1530+239 17 33 48 32.5 327.0 2.0 0.0 110 1384 13 44 14 13 46 28 ARP220 17 34 04 33.0 327.3 2.0 0.0 0 1384 13 46 28 13 50 28 --- 17 38 04 32.5 326.4 2.0 0.0 240 1445 13 46 29 13 51 04 J1532+2344 17 38 40 31.9 325.9 2.1 0.0 10 1445 13 51 04 13 52 54 =1530+239 17 40 41 31.7 325.5 2.1 0.0 110 1474 13 51 05 13 53 20 ARP220 17 40 56 32.1 325.8 2.1 0.0 0 1474 13 53 20 13 57 20 --- 17 44 57 31.6 324.9 2.2 0.0 240 1536 13 53 21 ---------- BLOCK 2 FINISHED ---------- 13 58 02 J1516+1932 17 45 40 32.1 317.9 2.5 0.0 7 1536 13 58 02 14 01 02 =1514+197 17 48 40 31.7 317.3 2.5 0.0 180 1582 13 58 03 14 01 54 J1532+2344 17 49 32 30.5 323.5 2.3 0.0 16 1582 14 01 54 14 03 44 =1530+239 17 51 33 30.2 323.1 2.3 0.0 110 1610 14 01 55 14 04 10 ARP220 17 51 48 30.7 323.3 2.3 0.0 0 1610 14 04 10 14 08 10 --- 17 55 49 30.1 322.5 2.3 0.0 240 1672 14 04 11 14 08 46 J1532+2344 17 56 25 29.6 322.1 2.4 0.0 10 1672 14 08 46 14 10 36 =1530+239 17 58 25 29.3 321.6 2.4 0.0 110 1700 14 08 47 14 11 01 ARP220 17 58 41 29.7 321.9 2.4 0.0 0 1700 14 11 01 14 15 01 --- 18 02 42 29.2 321.0 2.4 0.0 240 1762 14 11 02 14 15 37 J1532+2344 18 03 17 28.6 320.6 2.5 0.0 10 1762 14 15 37 14 17 27 =1530+239 18 05 18 28.3 320.2 2.5 0.0 110 1791 14 15 38 14 17 53 ARP220 18 05 33 28.8 320.5 2.5 0.0 0 1791 14 17 53 14 21 53 --- 18 09 34 28.2 319.6 2.6 0.0 240 1852 14 17 54 Schedule for HART (Code Hh ) Page 5 3.6cm global VLBI observations of Arp220 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 20 Oct 2017 Day 293 --- 14 22 28 J1532+2344 18 10 10 27.6 319.3 2.6 0.0 10 1852 14 22 28 14 24 18 =1530+239 18 12 10 27.3 318.9 2.6 0.0 110 1881 14 22 29 14 24 44 ARP220 18 12 26 27.8 319.1 2.6 0.0 0 1881 14 24 44 14 28 44 --- 18 16 26 27.2 318.3 2.7 0.0 240 1943 14 24 45 14 29 20 J1532+2344 18 17 02 26.6 317.9 2.7 0.0 10 1943 14 29 20 14 31 10 =1530+239 18 19 02 26.3 317.5 2.8 0.0 110 1971 14 29 21 14 31 35 ARP220 18 19 18 26.7 317.7 2.7 0.0 0 1971 14 31 35 14 35 35 --- 18 23 19 26.1 317.0 2.8 0.0 240 2033 14 31 36 14 36 11 J1532+2344 18 23 55 25.5 316.6 2.8 0.0 10 2033 14 36 11 14 38 01 =1530+239 18 25 55 25.2 316.2 2.9 0.0 110 2061 14 36 12 14 38 26 ARP220 18 26 11 25.7 316.4 2.8 0.0 0 2061 14 38 26 14 42 26 --- 18 30 11 25.1 315.7 2.9 0.0 240 2123 14 38 27 14 43 02 J1532+2344 18 30 47 24.5 315.3 3.0 0.0 10 2123 14 43 02 14 44 52 =1530+239 18 32 47 24.1 315.0 3.0 0.0 110 2151 14 43 03 14 45 18 ARP220 18 33 03 24.6 315.1 3.0 0.0 0 2151 14 45 18 14 49 18 --- 18 37 04 24.0 314.4 3.0 0.0 240 2213 14 45 19 14 49 53 J1532+2344 18 37 39 23.4 314.1 3.1 0.0 10 2213 14 49 53 14 51 43 =1530+239 18 39 40 23.0 313.8 3.1 0.0 110 2241 14 49 54 14 52 09 ARP220 18 39 55 23.5 313.9 3.1 0.0 0 2241 14 52 09 14 56 09 --- 18 43 56 22.9 313.2 3.1 0.0 240 2303 14 52 10 ---------- BLOCK 3 FINISHED ---------- 14 56 53 J1516+1932 18 44 40 22.3 306.9 3.4 0.0 8 2303 14 56 53 14 59 53 =1514+197 18 47 41 21.8 306.4 3.5 0.0 180 2350 14 56 54 15 00 46 J1532+2344 18 48 34 21.6 312.2 3.3 0.0 18 2350 15 00 46 15 02 36 =1530+239 18 50 34 21.2 311.9 3.3 0.0 110 2378 15 00 47 15 03 02 ARP220 18 50 50 21.7 312.0 3.3 0.0 0 2378 15 03 02 15 07 02 --- 18 54 51 21.0 311.4 3.3 0.0 240 2440 15 03 03 15 07 38 J1532+2344 18 55 26 20.4 311.1 3.4 0.0 10 2440 15 07 38 15 09 28 =1530+239 18 57 27 20.1 310.7 3.4 0.0 110 2468 15 07 39 Schedule for HART (Code Hh ) Page 6 3.6cm global VLBI observations of Arp220 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 20 Oct 2017 Day 293 --- 15 09 53 ARP220 18 57 42 20.6 310.9 3.4 0.0 0 2468 15 09 53 15 13 53 --- 19 01 43 19.9 310.2 3.4 0.0 240 2530 15 09 54 15 14 29 J1532+2344 19 02 19 19.2 310.0 3.5 0.0 10 2530 15 14 29 15 16 19 =1530+239 19 04 19 18.9 309.6 3.5 0.0 110 2558 15 14 30 15 16 44 ARP220 19 04 35 19.4 309.8 3.5 0.0 0 2558 15 16 44 15 20 44 --- 19 08 36 18.7 309.1 3.5 0.0 240 2620 15 16 45 15 21 20 J1532+2344 19 09 11 18.0 308.9 3.6 0.0 10 2620 15 21 20 15 23 10 =1530+239 19 11 12 17.7 308.6 3.6 0.0 110 2649 15 21 21 15 23 36 ARP220 19 11 27 18.2 308.7 3.6 0.0 0 2649 15 23 36 15 27 36 --- 19 15 28 17.5 308.1 3.7 0.0 240 2710 15 23 37 15 28 11 J1532+2344 19 16 04 16.8 307.8 3.7 0.0 10 2710 15 28 11 15 30 01 =1530+239 19 18 04 16.5 307.5 3.7 0.0 110 2739 15 28 12 15 30 27 ARP220 19 18 20 17.0 307.6 3.7 0.0 0 2739 15 30 27 15 34 27 --- 19 22 20 16.3 307.0 3.8 0.0 240 2801 15 30 28 15 35 03 J1532+2344 19 22 56 15.6 306.8 3.8 0.0 10 2801 15 35 03 15 36 53 =1530+239 19 24 56 15.2 306.5 3.9 0.0 110 2829 15 35 04 15 37 18 ARP220 19 25 12 15.7 306.6 3.8 0.0 0 2829 15 37 18 15 41 18 --- 19 29 13 15.0 306.0 3.9 0.0 240 2891 15 37 19 15 41 54 J1532+2344 19 29 49 14.4 305.8 3.9 0.0 10 2891 15 41 54 15 43 44 =1530+239 19 31 49 14.0 305.5 4.0 0.0 110 2919 15 41 55 15 44 10 ARP220 19 32 05 14.5 305.6 3.9 0.0 0 2919 15 44 10 15 48 10 --- 19 36 05 13.7 305.0 4.0 0.0 240 2981 15 44 11 15 48 45 J1532+2344 19 36 41 13.1 304.8 4.1 0.0 10 2981 15 48 45 15 50 35 =1530+239 19 38 41 12.7 304.6 4.1 0.0 110 3009 15 48 46 15 51 01 ARP220 19 38 57 13.2 304.6 4.1 0.0 0 3009 15 51 01 15 55 01 --- 19 42 58 12.5 304.1 4.1 0.0 240 3071 15 51 02 ---------- BLOCK 4 FINISHED ---------- 15 55 46 J1516+1932 19 43 42 11.1 298.2 4.4 0.0 9 3071 15 55 46 15 58 46 =1514+197 19 46 43 10.5 297.8 4.5 0.0 180 3117 15 55 47 Schedule for HART (Code Hh ) Page 7 3.6cm global VLBI observations of Arp220 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 20 Oct 2017 Day 293 --- 15 59 39 J1532+2344 19 47 37 11.1 303.4 4.2 0.0 18 3117 15 59 39 16 01 29 =1530+239 19 49 37 10.7 303.1 4.3 0.0 110 3146 15 59 40 16 01 55 ARP220 19 49 53 11.2 303.2 4.2 0.0 0 3146 16 01 55 16 05 55 --- 19 53 53 10.4 302.6 4.3 0.0 240 3208 16 01 56 16 06 30 J1532+2344 19 54 29 9.8 302.4 4.3 0.0 10 3208 16 06 30 16 08 20 =1530+239 19 56 29 9.4 302.2 4.4 0.0 110 3236 16 06 31 16 08 46 ARP220 19 56 45 9.9 302.2 4.4 0.0 0 3236 16 08 46 16 12 46 --- 20 00 46 9.1 301.7 4.4 0.0 240 3298 16 08 47 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess317.X2048glob Matching groups in /home/guest/rmc/SCHED/sched11.4/catalogs/freq_RDBE.dat: hhsx Values confirmed by E-mail Jonathan Quick 20140219 (CR) ****** Only 128.00 of 512.00 MHz total bandwidth is within the IFs in the setup file before any FREQ or DOPPLER shifts. Setup group: 16 Station: HART Total bit rate: 2048 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 8080.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 5 13 5 13 7 15 7 15 BBC SB= L L U U L L U U L L U U L L U U IF = A1 C1 A1 C1 A1 C1 A1 C1 B1 C1 B1 C1 B1 C1 B1 C1 The following frequency sets based on these setups were used. Frequency Set: 11 Setup file default. Used with PCAL = off LO sum= 8272.00 8272.00 8272.00 8272.00 8336.00 8336.00 8336.00 8336.00 8400.00 8400.00 8400.00 8400.00 8464.00 8464.00 8464.00 8464.00 BBC fr= 192.00 192.00 192.00 192.00 256.00 256.00 256.00 256.00 320.00 320.00 320.00 320.00 384.00 384.00 384.00 384.00 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 11 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * ARP220 15 32 46.905485 * 15 34 57.250000 15 35 41.600758 0.00 23 40 07.75728 * 23 30 11.33000 23 26 58.91920 0.00 From catalog imbedded in main SCHED input file. Pos. from Batejat. et al 2011 1514+197 15 14 40.985840 * 15 16 56.796162 15 17 43.074973 0.01 * J1516+1932 19 43 10.94252 * 19 32 12.99209 19 28 37.83567 0.02 J1516+19 /home/guest/rmc/SCHED/sched11.4/catalogs/sources.gsfc GSFC 2015a astro solution, unpublished 2699 observations. 1530+239 15 30 36.092767 * 15 32 46.345222 15 33 30.652858 0.10 * J1532+2344 23 54 09.32921 * 23 44 05.26804 23 40 50.07377 0.17 /home/guest/rmc/SCHED/sched11.4/catalogs/sources.gsfc GSFC 2015a astro solution, unpublished 90 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 ARP220 sess317.X2048glob 1 2 3 4 5 6 7 8 11 13 15 24 6.667 712.929 J1516+1932 sess317.X2048glob 1 2 3 4 5 6 7 8 11 13 15 24 0.650 66.000 J1532+2344 sess317.X2048glob 1 2 3 4 5 6 7 8 11 13 15 24 3.167 334.583 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) ARP220 43.9 J1516+1932 38.2 J1532+2344 43.8 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