COVER INFORMATION Station: HART (Code Hh ) Experiment: AGN Cores Exp. Code: EC070E Schedule Version: 2.00 Processed by SCHED version: 11.50 Development version 11.5. Started Apr. 2 PI: E. Chiaraluce Address: INAF-IAPS via del Fosso del Cavaliere, 100 00133 - Rome Italy Phone: +39 06 4548 8467 EMAIL: elia.chiaraluce@inaf.it Fax: --- Phone during observation: +39 06 4548 8467 Observing mode: Phase-referencing for sources at 3.6cm Notes: Targets: NGC4593, NGC5252, NGC5506 Phase calibrators: J1248-0632, J1331+0608, J1404-0013 D-terms calibrator : -- Fringe finder : 3C286 Schedule for HART (Code Hh ) Page 2 AGN Cores 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 ---------------------------------------------------------------------------------------- --- Thu 20 Feb 2020 Day 51 --- Next scan frequencies: 8319.49 8319.49 8319.49 8319.49 8383.49 8383.49 8383.49 8383.49 8447.49 8447.49 8447.49 8447.49 8511.49 8511.49 8511.49 8511.49 Next BBC frequencies: 239.49 239.49 239.49 239.49 303.49 303.49 303.49 303.49 367.49 367.49 367.49 367.49 431.49 431.49 431.49 431.49 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 22 00 00 J1248-0632 09 51 58 43.6 73.5 -3.0 0.0 0 0 22 00 00 22 01 00 =1245-062 09 52 59 43.8 73.3 -2.9 0.0 60 15 22 00 01 22 01 45 NGC4593 09 53 44 45.2 70.2 -2.8 0.0 14 15 22 01 45 22 06 20 --- 09 58 19 46.2 69.3 -2.7 0.0 275 86 22 01 46 22 06 51 J1248-0632 09 58 50 45.1 72.3 -2.8 0.0 0 86 22 06 51 22 07 51 =1245-062 09 59 51 45.3 72.1 -2.8 0.0 60 102 22 06 52 22 08 36 NGC4593 10 00 36 46.7 68.9 -2.7 0.0 14 102 22 08 36 22 13 11 --- 10 05 11 47.6 68.0 -2.6 0.0 275 173 22 08 37 22 13 42 J1248-0632 10 05 43 46.5 71.0 -2.7 0.0 0 173 22 13 42 22 14 42 =1245-062 10 06 43 46.7 70.9 -2.7 0.0 60 188 22 13 43 22 15 27 NGC4593 10 07 28 48.1 67.5 -2.6 0.0 14 188 22 15 27 22 20 02 --- 10 12 04 49.0 66.5 -2.5 0.0 275 259 22 15 28 22 20 33 J1248-0632 10 12 35 48.0 69.7 -2.6 0.0 0 259 22 20 33 22 21 33 =1245-062 10 13 35 48.2 69.5 -2.6 0.0 60 274 22 20 34 22 22 18 NGC4593 10 14 20 49.5 66.1 -2.4 0.0 14 274 22 22 18 22 26 53 --- 10 18 56 50.5 65.0 -2.4 0.0 275 345 22 22 19 22 27 24 J1248-0632 10 19 27 49.4 68.3 -2.5 0.0 0 345 22 27 24 22 28 24 =1245-062 10 20 27 49.6 68.1 -2.5 0.0 60 361 22 27 25 22 29 09 NGC4593 10 21 12 50.9 64.5 -2.3 0.0 14 361 22 29 09 22 33 44 --- 10 25 48 51.8 63.5 -2.2 0.0 275 432 22 29 10 22 34 15 J1248-0632 10 26 19 50.8 66.9 -2.4 0.0 0 432 22 34 15 22 35 15 =1245-062 10 27 19 51.1 66.7 -2.4 0.0 60 447 22 34 16 22 36 00 NGC4593 10 28 04 52.3 62.9 -2.2 0.0 14 447 22 36 00 22 40 35 --- 10 32 40 53.2 61.8 -2.1 0.0 275 518 22 36 01 22 41 13 J1248-0632 10 33 18 52.3 65.3 -2.3 0.0 7 518 22 41 13 22 42 13 =1245-062 10 34 18 52.5 65.1 -2.3 0.0 60 533 22 41 14 Schedule for HART (Code Hh ) Page 3 AGN Cores 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 ---------------------------------------------------------------------------------------- --- Thu 20 Feb 2020 Day 51 --- 22 42 58 NGC4593 10 35 03 53.7 61.2 -2.1 0.0 14 533 22 42 58 22 47 33 --- 10 39 39 54.6 60.0 -2.0 0.0 275 604 22 42 59 22 48 10 J1248-0632 10 40 16 53.7 63.7 -2.2 0.0 7 604 22 48 10 22 49 10 =1245-062 10 41 17 53.9 63.4 -2.1 0.0 60 620 22 48 11 22 49 55 NGC4593 10 42 02 55.1 59.3 -2.0 0.0 14 620 22 49 55 22 54 30 --- 10 46 37 55.9 58.0 -1.9 0.0 275 690 22 49 56 22 55 08 J1248-0632 10 47 15 55.1 61.9 -2.0 0.0 7 690 22 55 08 22 56 08 =1245-062 10 48 15 55.3 61.6 -2.0 0.0 60 706 22 55 09 22 56 53 NGC4593 10 49 00 56.4 57.4 -1.9 0.0 14 706 22 56 53 23 01 28 --- 10 53 36 57.3 56.0 -1.8 0.0 275 777 22 56 54 23 02 05 J1248-0632 10 54 14 56.5 60.0 -1.9 0.0 7 777 23 02 05 23 03 05 =1245-062 10 55 14 56.7 59.7 -1.9 0.0 60 792 23 02 06 23 03 50 NGC4593 10 55 59 57.7 55.3 -1.7 0.0 14 792 23 03 50 23 08 25 --- 11 00 35 58.5 53.8 -1.7 0.0 275 863 23 03 51 23 09 10 J1248-0632 11 01 20 57.8 58.0 -1.8 0.0 14 863 23 09 10 23 10 10 =1245-062 11 02 20 58.0 57.7 -1.8 0.0 60 879 23 09 11 23 10 55 NGC4593 11 03 05 59.0 53.0 -1.6 0.0 14 879 23 10 55 23 11 55 --- 11 04 05 59.2 52.6 -1.6 0.0 60 894 23 10 56 23 14 08 3C286 11 06 18 23.8 34.0 -2.4 0.0 34 894 23 14 08 23 16 19 --- 11 08 30 24.1 33.6 -2.4 0.0 131 928 23 14 09 23 18 02 J1331+0608 11 10 13 42.9 52.4 -2.4 0.0 27 928 23 18 02 23 19 02 =1329+063 11 11 13 43.1 52.1 -2.4 0.0 60 943 23 18 03 23 19 47 NGC5252 11 11 58 43.2 55.0 -2.5 0.0 16 943 23 19 47 23 24 47 --- 11 16 59 44.1 53.8 -2.4 0.0 300 1021 23 19 48 23 25 32 J1331+0608 11 17 44 44.2 50.5 -2.3 0.0 15 1021 23 25 32 23 26 32 =1329+063 11 18 45 44.4 50.3 -2.2 0.0 60 1036 23 25 33 23 27 17 NGC5252 11 19 30 44.5 53.2 -2.3 0.0 16 1036 23 27 17 23 32 17 --- 11 24 30 45.4 52.0 -2.2 0.0 300 1113 23 27 18 23 33 02 J1331+0608 11 25 16 45.5 48.6 -2.1 0.0 15 1113 23 33 02 23 34 02 =1329+063 11 26 16 45.7 48.4 -2.1 0.0 60 1129 23 33 03 Schedule for HART (Code Hh ) Page 4 AGN Cores 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 ---------------------------------------------------------------------------------------- --- Thu 20 Feb 2020 Day 51 --- 23 34 47 NGC5252 11 27 01 45.9 51.4 -2.2 0.0 16 1129 23 34 47 23 39 47 --- 11 32 02 46.8 50.1 -2.1 0.0 300 1206 23 34 48 23 40 32 J1331+0608 11 32 47 46.8 46.6 -2.0 0.0 15 1206 23 40 32 23 41 32 =1329+063 11 33 47 46.9 46.3 -2.0 0.0 60 1221 23 40 33 23 42 17 NGC5252 11 34 32 47.2 49.4 -2.1 0.0 16 1221 23 42 17 23 47 17 --- 11 39 33 48.0 48.1 -2.0 0.0 300 1299 23 42 18 ---------- Eff pointing ---------- 23 48 02 J1331+0608 11 40 18 48.0 44.5 -1.9 0.0 15 1299 23 48 02 23 49 02 =1329+063 11 41 18 48.1 44.2 -1.9 0.0 60 1314 23 48 03 ---------- Eff pointing ---------- 23 49 47 NGC5252 11 42 03 48.4 47.4 -2.0 0.0 16 1314 23 49 47 23 54 47 --- 11 47 04 49.3 45.9 -1.9 0.0 300 1392 23 49 48 ---------- Eff pointing ---------- 23 55 32 J1331+0608 11 47 49 49.1 42.3 -1.8 0.0 15 1392 23 55 32 23 56 32 =1329+063 11 48 49 49.3 42.0 -1.7 0.0 60 1407 23 55 33 --- Start: Thu 20 Feb 2020 Day 51 -- Stop: Fri 21 Feb 2020 Day 52 --- ---------- Eff pointing ---------- 23 57 17 NGC5252 11 49 35 49.7 45.2 -1.8 0.0 16 1407 23 57 17 00 02 17 --- 11 54 35 50.5 43.7 -1.7 0.0 300 1484 23 57 18 00 03 02 J1331+0608 11 55 21 50.3 40.0 -1.6 0.0 15 1484 00 03 02 00 04 02 =1329+063 11 56 21 50.4 39.6 -1.6 0.0 60 1500 00 03 03 00 04 47 NGC5252 11 57 06 50.8 42.9 -1.7 0.0 16 1500 00 04 47 00 09 47 --- 12 02 07 51.6 41.3 -1.6 0.0 300 1577 00 04 48 00 10 32 J1331+0608 12 02 52 51.3 37.5 -1.5 0.0 15 1577 00 10 32 00 11 32 =1329+063 12 03 52 51.4 37.2 -1.5 0.0 60 1592 00 10 33 00 12 17 NGC5252 12 04 37 52.0 40.5 -1.6 0.0 16 1592 00 12 17 00 17 17 --- 12 09 38 52.7 38.8 -1.5 0.0 300 1670 00 12 18 00 18 02 J1331+0608 12 10 23 52.3 35.0 -1.4 0.0 15 1670 00 18 02 00 19 02 =1329+063 12 11 23 52.4 34.6 -1.4 0.0 60 1685 00 18 03 Schedule for HART (Code Hh ) Page 5 AGN Cores 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 21 Feb 2020 Day 52 --- 00 19 47 NGC5252 12 12 08 53.0 38.0 -1.5 0.0 16 1685 00 19 47 00 24 47 --- 12 17 09 53.7 36.2 -1.4 0.0 300 1763 00 19 48 00 25 32 J1331+0608 12 17 54 53.2 32.3 -1.3 0.0 15 1763 00 25 32 00 26 32 =1329+063 12 18 54 53.4 31.9 -1.2 0.0 60 1778 00 25 33 00 27 17 NGC5252 12 19 39 54.1 35.3 -1.3 0.0 16 1778 00 27 17 00 32 17 --- 12 24 40 54.7 33.5 -1.2 0.0 300 1855 00 27 18 00 33 02 J1331+0608 12 25 25 54.1 29.5 -1.1 0.0 15 1855 00 33 02 00 34 02 =1329+063 12 26 26 54.2 29.1 -1.1 0.0 60 1871 00 33 03 00 34 47 NGC5252 12 27 11 55.0 32.5 -1.2 0.0 16 1871 00 34 47 00 35 47 --- 12 28 11 55.1 32.2 -1.2 0.0 60 1886 00 34 48 00 37 47 3C286 12 30 12 31.8 15.7 -1.0 0.0 41 1886 00 37 47 00 39 47 --- 12 32 12 31.9 15.2 -1.0 0.0 120 1917 00 37 48 00 42 15 J1404-0013 12 34 40 56.4 44.0 -1.5 0.0 59 1917 00 42 15 00 43 15 =1401+000 12 35 40 56.5 43.7 -1.5 0.0 60 1933 00 42 16 00 44 00 NGC5506 12 36 25 57.4 50.2 -1.6 0.0 12 1933 00 44 00 00 49 00 --- 12 41 26 58.3 48.4 -1.5 0.0 300 2010 00 44 01 00 49 45 J1404-0013 12 42 11 57.5 41.3 -1.4 0.0 12 2010 00 49 45 00 50 45 =1401+000 12 43 12 57.7 40.9 -1.4 0.0 60 2025 00 49 46 00 51 30 NGC5506 12 43 57 58.7 47.6 -1.5 0.0 12 2025 00 51 30 00 56 30 --- 12 48 57 59.5 45.7 -1.4 0.0 300 2103 00 51 31 00 57 15 J1404-0013 12 49 43 58.6 38.4 -1.3 0.0 12 2103 00 57 15 00 58 15 =1401+000 12 50 43 58.8 38.0 -1.2 0.0 60 2118 00 57 16 00 59 00 NGC5506 12 51 28 59.9 44.8 -1.4 0.0 12 2118 00 59 00 01 04 00 --- 12 56 29 60.7 42.8 -1.3 0.0 300 2195 00 59 01 01 04 45 J1404-0013 12 57 14 59.6 35.3 -1.1 0.0 12 2195 01 04 45 01 05 45 =1401+000 12 58 14 59.8 34.9 -1.1 0.0 60 2211 01 04 46 01 06 30 NGC5506 12 58 59 61.1 41.8 -1.3 0.0 12 2211 01 06 30 01 11 30 --- 13 04 00 61.8 39.6 -1.2 0.0 300 2288 01 06 31 01 12 15 J1404-0013 13 04 45 60.6 32.1 -1.0 0.0 12 2288 01 12 15 01 13 15 =1401+000 13 05 45 60.7 31.6 -1.0 0.0 60 2304 01 12 16 Schedule for HART (Code Hh ) Page 6 AGN Cores 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 21 Feb 2020 Day 52 --- 01 14 00 NGC5506 13 06 30 62.2 38.5 -1.1 0.0 12 2304 01 14 00 01 19 00 --- 13 11 31 62.8 36.3 -1.0 0.0 300 2381 01 14 01 01 19 45 J1404-0013 13 12 16 61.4 28.6 -0.9 0.0 12 2381 01 19 45 01 20 45 =1401+000 13 13 16 61.5 28.1 -0.9 0.0 60 2396 01 19 46 01 21 30 NGC5506 13 14 02 63.2 35.1 -1.0 0.0 12 2396 01 21 30 01 26 30 --- 13 19 02 63.8 32.7 -0.9 0.0 300 2474 01 21 31 01 27 15 J1404-0013 13 19 48 62.2 25.0 -0.8 0.0 12 2474 01 27 15 01 28 15 =1401+000 13 20 48 62.3 24.5 -0.7 0.0 60 2489 01 27 16 01 29 00 NGC5506 13 21 33 64.1 31.4 -0.9 0.0 12 2489 01 29 00 01 34 00 --- 13 26 34 64.7 28.8 -0.8 0.0 300 2566 01 29 01 01 34 45 J1404-0013 13 27 19 62.8 21.2 -0.6 0.0 12 2566 01 34 45 01 35 45 =1401+000 13 28 19 62.9 20.6 -0.6 0.0 60 2582 01 34 46 01 36 30 NGC5506 13 29 04 64.9 27.5 -0.8 0.0 12 2582 01 36 30 01 41 30 --- 13 34 05 65.4 24.8 -0.7 0.0 300 2659 01 36 31 01 42 15 J1404-0013 13 34 50 63.4 17.2 -0.5 0.0 12 2659 01 42 15 01 43 15 =1401+000 13 35 50 63.5 16.6 -0.5 0.0 60 2675 01 42 16 01 44 00 NGC5506 13 36 35 65.7 23.4 -0.6 0.0 12 2675 01 44 00 01 49 00 --- 13 41 36 66.1 20.5 -0.5 0.0 300 2752 01 44 01 01 49 45 J1404-0013 13 42 21 63.8 13.1 -0.4 0.0 12 2752 01 49 45 01 50 45 =1401+000 13 43 21 63.9 12.5 -0.4 0.0 60 2767 01 49 46 01 51 30 NGC5506 13 44 07 66.3 19.0 -0.5 0.0 12 2767 01 51 30 01 56 30 --- 13 49 07 66.6 16.0 -0.4 0.0 300 2845 01 51 31 01 57 15 J1404-0013 13 49 52 64.2 8.8 -0.3 0.0 12 2845 01 57 15 01 58 15 =1401+000 13 50 53 64.2 8.3 -0.2 0.0 60 2860 01 57 16 01 59 00 NGC5506 13 51 38 66.8 14.5 -0.4 0.0 12 2860 01 59 00 02 00 00 --- 13 52 38 66.8 13.8 -0.4 0.0 60 2876 01 59 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess120.X2048 Matching groups in /home/guest/rmc/SCHED/sched11.5/catalogs/freq.dat: hhsx Values confirmed by E-mail Jonathan Quick 20140219 (CR) ****** Only 256.00 of 512.00 MHz total bandwidth is within the IFs in the setup file before any FREQ or DOPPLER shifts. Setup group: 6 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 2 10 2 10 3 11 3 11 4 12 4 12 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 A1 C1 A1 C1 A1 C1 A1 C1 The following frequency sets based on these setups were used. Frequency Set: 6 Setup file default. Used with PCAL = off LO sum= 8319.49 8319.49 8319.49 8319.49 8383.49 8383.49 8383.49 8383.49 8447.49 8447.49 8447.49 8447.49 8511.49 8511.49 8511.49 8511.49 BBC fr= 239.49 239.49 239.49 239.49 303.49 303.49 303.49 303.49 367.49 367.49 367.49 367.49 431.49 431.49 431.49 431.49 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: 6 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) * NGC4593 12 37 04.666004 * 12 39 39.445000 12 40 41.821919 0.00 -05 04 10.89761 *-05 20 39.02000 -05 27 16.11256 0.00 From catalog imbedded in main SCHED input file. * NGC5252 13 35 44.341975 * 13 38 15.871000 13 39 16.685857 0.00 04 47 47.16378 * 04 32 33.51800 04 26 24.31579 0.00 From catalog imbedded in main SCHED input file. * NGC5506 14 10 39.141168 * 14 13 14.879000 14 14 17.224063 0.00 -02 58 27.08611 *-03 12 27.65100 -03 18 05.08382 0.00 From catalog imbedded in main SCHED input file. 1245-062 12 45 47.681424 * 12 48 22.975659 12 49 25.533354 0.05 * J1248-0632 -06 15 48.75641 *-06 32 09.81786 -06 38 43.62460 0.10 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 261 observations. * 3C286 13 28 49.657769 * 13 31 08.288061 13 32 04.046779 0.17 J1331+3030 30 45 58.64066 * 30 30 32.95930 30 24 12.96611 0.16 1328+307 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc J1331+30 GSFC 2016a X/S astro solution, 269 observations. 1329+063 13 29 22.954597 * 13 31 53.897134 13 32 54.503435 0.10 * J1331+0608 06 23 48.09892 * 06 08 23.39134 06 02 09.30748 0.18 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 147 observations. 1401+000 14 01 38.289229 * 14 04 12.123975 14 05 13.747477 0.06 * J1404-0013 00 00 56.29689 *-00 13 25.09126 -00 19 11.85754 0.12 J1401-000 /home/guest/rmc/SCHED/sched11.5/catalogs/sources.gsfc GSFC 2016a X/S astro solution, 209 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 NGC4593 sess120.X2048 1 2 3 4 5 6 7 8 0.781 40.639 NGC5252 sess120.X2048 1 2 3 4 5 6 7 8 0.850 45.083 NGC5506 sess120.X2048 1 2 3 4 5 6 7 8 0.850 43.250 J1248-0632 sess120.X2048 1 2 3 4 5 6 7 8 0.183 9.083 3C286 sess120.X2048 1 2 3 4 5 6 7 8 0.070 3.835 J1331+0608 sess120.X2048 1 2 3 4 5 6 7 8 0.183 9.750 J1404-0013 sess120.X2048 1 2 3 4 5 6 7 8 0.183 9.250 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) NGC4593 140.3 NGC5252 129.1 NGC5506 118.9 J1248-0632 137.8 3C286 130.4 J1331+0608 130.9 J1404-0013 121.8 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