COVER INFORMATION Station: VLBA_FD (Code Fd ) Experiment: BW085 / Lens J0134-0931 / Winn and Keeton Exp. Code: BW085 Schedule Version: 1.00 Processed by SCHED version: 6.02 July 2005 PI: Joshua N. Winn Address: Harvard-Smithsonian Center for Astrophysics 60 Garden St. MS-51 Cambridge, MA 02138 Phone: +1-617-384-9663 (w) / +1-617-666-2341 (h) EMAIL: jwinn@cfa.harvard.edu Fax: +1-617-495-7093 Phone during observation: +1-617-384-9663 (w) / +1-617-666-2341 (h) Observing mode: Standard 4cm band, 256-8-2 Notes: 256 Mbps has been approved for BW085 fringe finders: J2253+1608, J0555+3948 Schedule for VLBA_FD (Code Fd ) Page 2 BW085 / Lens J0134-0931 / Winn and Keeton UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 30 Dec 2005 Day 364 --- Next scan frequencies: 8399.49 8399.49 8407.49 8407.49 8415.49 8415.49 8423.49 8423.49 Next BBC frequencies: 799.49 799.49 807.49 807.49 815.49 815.49 823.49 823.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 22 15 00 GL0134 21 57 01 24.2 118.4 -3.6 -50.1 0 1 1 0 Stopped 22 20 00 --- 22 02 02 25.1 119.3 -3.5 -49.6 300 S 1 0 22 30 00 GL0134 22 12 04 27.0 121.1 -3.4 -48.3 590 1 1 0 22 30 00 22 39 00 --- 22 21 05 28.6 122.8 -3.2 -47.2 540 F 1 0 22 30 18 22 39 00 J0141-0928 22 21 05 27.4 121.5 -3.3 -48.1 -8 1 1 0 22 39 00 22 40 00 =0138-097 22 22 05 27.6 121.6 -3.3 -48.0 52 F 1 0 22 39 00 22 40 00 GL0134 22 22 05 28.8 123.0 -3.2 -47.1 -8 1 1 0 22 40 00 22 49 00 --- 22 31 07 30.4 124.7 -3.1 -45.8 532 F 1 0 22 40 00 22 49 00 J0141-0928 22 31 07 29.2 123.4 -3.2 -46.8 -8 1 1 0 22 49 00 22 50 00 =0138-097 22 32 07 29.4 123.5 -3.2 -46.6 52 F 1 0 22 49 00 22 50 00 GL0134 22 32 07 30.6 124.9 -3.0 -45.7 -8 1 1 0 22 50 00 22 59 00 --- 22 41 08 32.2 126.8 -2.9 -44.3 532 F 1 0 22 50 00 22 59 00 J0141-0928 22 41 08 31.0 125.3 -3.0 -45.4 -8 1 1 0 22 59 00 23 00 00 =0138-097 22 42 08 31.2 125.5 -3.0 -45.2 52 F 1 0 22 59 00 23 00 00 GL0134 22 42 08 32.3 127.0 -2.9 -44.2 -8 1 1 0 23 00 00 23 09 00 --- 22 51 10 33.9 128.9 -2.7 -42.8 532 F 1 0 23 00 00 23 09 00 J0141-0928 22 51 10 32.7 127.4 -2.8 -43.9 -8 1 1 0 23 09 00 23 10 00 =0138-097 22 52 10 32.9 127.6 -2.8 -43.7 52 F 1 0 23 09 00 23 10 00 GL0134 22 52 10 34.0 129.1 -2.7 -42.6 -8 1 1 0 23 10 00 23 19 00 --- 23 01 12 35.5 131.1 -2.6 -41.1 532 F 1 0 23 10 00 23 19 00 J0141-0928 23 01 12 34.4 129.6 -2.7 -42.2 -8 1 1 0 23 19 00 23 20 00 =0138-097 23 02 12 34.6 129.8 -2.7 -42.1 52 F 1 0 23 19 00 23 20 00 GL0134 23 02 12 35.7 131.4 -2.5 -40.9 -8 1 1 0 23 20 00 23 29 00 --- 23 11 13 37.1 133.5 -2.4 -39.3 532 F 1 0 23 20 00 Schedule for VLBA_FD (Code Fd ) Page 3 BW085 / Lens J0134-0931 / Winn and Keeton UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Fri 30 Dec 2005 Day 364 --- 23 29 00 J0141-0928 23 11 13 36.1 131.8 -2.5 -40.5 -8 1 1 0 23 29 00 23 30 00 =0138-097 23 12 13 36.2 132.1 -2.5 -40.3 52 F 1 0 23 29 00 23 30 00 GL0134 23 12 13 37.3 133.7 -2.4 -39.1 -8 1 1 0 23 30 00 23 39 00 --- 23 21 15 38.6 135.9 -2.2 -37.3 532 F 1 0 23 30 00 23 39 00 J0141-0928 23 21 15 37.6 134.2 -2.3 -38.7 -8 1 1 0 23 39 00 23 40 00 =0138-097 23 22 15 37.8 134.5 -2.3 -38.5 52 F 1 0 23 39 00 23 40 00 GL0134 23 22 15 38.8 136.2 -2.2 -37.1 -8 1 1 0 23 40 00 23 49 00 --- 23 31 17 40.1 138.5 -2.1 -35.3 532 F 1 0 23 40 00 23 49 00 J0141-0928 23 31 17 39.1 136.7 -2.2 -36.7 -8 1 1 0 23 49 00 23 50 00 =0138-097 23 32 17 39.3 137.0 -2.2 -36.5 52 F 1 0 23 49 00 23 50 00 GL0134 23 32 17 40.2 138.8 -2.0 -35.1 -8 1 1 0 23 50 00 23 59 00 --- 23 41 18 41.5 141.2 -1.9 -33.1 532 F 1 0 23 50 00 23 59 00 J0141-0928 23 41 18 40.6 139.3 -2.0 -34.6 -8 1 1 0 23 59 00 23 59 59 =0138-097 23 42 18 40.7 139.6 -2.0 -34.4 51 F 1 0 23 59 00 --- Sat 31 Dec 2005 Day 365 --- 00 00 00 GL0134 23 42 18 41.6 141.5 -1.9 -32.9 -8 1 1 0 00 00 00 00 09 00 --- 23 51 20 42.8 144.1 -1.7 -30.8 532 F 1 0 00 00 18 00 09 00 J0141-0928 23 51 20 42.0 142.1 -1.8 -32.4 -8 1 1 0 00 09 00 00 10 00 =0138-097 23 52 20 42.1 142.4 -1.8 -32.2 52 F 1 0 00 09 00 00 12 00 J2253+1608 23 54 20 70.1 226.9 1.0 40.9 58 1 1 0 00 12 00 00 18 00 =2251+158 00 00 21 69.1 230.0 1.1 43.3 360 F 1 0 00 12 18 00 18 00 GL0134 00 00 21 43.9 146.7 -1.6 -28.6 -62 1 1 0 00 18 00 00 27 00 --- 00 09 23 44.9 149.5 -1.4 -26.3 478 F 1 0 00 18 00 00 27 00 J0141-0928 00 09 23 44.2 147.3 -1.5 -28.1 -7 1 1 0 00 27 00 00 28 00 =0138-097 00 10 23 44.3 147.7 -1.5 -27.8 53 F 1 0 00 27 00 00 28 00 GL0134 00 10 23 45.0 149.8 -1.4 -26.0 -7 1 1 0 00 28 00 00 37 00 --- 00 19 24 46.0 152.7 -1.3 -23.6 533 F 1 0 00 28 00 00 37 00 J0141-0928 00 19 24 45.3 150.5 -1.4 -25.5 -7 1 1 0 00 37 00 00 38 00 =0138-097 00 20 25 45.4 150.8 -1.4 -25.2 53 F 1 0 00 37 00 Schedule for VLBA_FD (Code Fd ) Page 4 BW085 / Lens J0134-0931 / Winn and Keeton UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Sat 31 Dec 2005 Day 365 --- 00 38 00 GL0134 00 20 25 46.1 153.0 -1.2 -23.3 -7 1 1 0 00 38 00 00 47 00 --- 00 29 26 46.9 156.0 -1.1 -20.8 533 F 1 0 00 38 00 00 47 00 J0141-0928 00 29 26 46.3 153.7 -1.2 -22.7 -8 1 1 0 00 47 00 00 48 00 =0138-097 00 30 26 46.4 154.0 -1.2 -22.5 52 F 1 0 00 47 00 00 48 00 GL0134 00 30 26 47.0 156.3 -1.1 -20.5 -8 1 1 0 00 48 00 00 57 00 --- 00 39 28 47.7 159.4 -0.9 -17.8 532 F 1 0 00 48 00 00 57 00 J0141-0928 00 39 28 47.2 157.1 -1.0 -19.9 -8 1 1 0 00 57 00 00 58 00 =0138-097 00 40 28 47.3 157.4 -1.0 -19.6 52 F 1 0 00 57 00 00 58 00 GL0134 00 40 28 47.8 159.8 -0.9 -17.5 -8 1 1 0 00 58 00 01 07 00 --- 00 49 29 48.4 163.0 -0.8 -14.8 532 F 1 0 00 58 00 01 07 00 J0141-0928 00 49 29 48.0 160.5 -0.9 -16.9 -8 1 1 0 01 07 00 01 08 00 =0138-097 00 50 29 48.1 160.9 -0.9 -16.6 52 F 1 0 01 07 00 01 08 00 GL0134 00 50 29 48.5 163.3 -0.7 -14.5 -8 1 1 0 01 08 00 01 17 00 --- 00 59 31 49.0 166.6 -0.6 -11.6 532 F 1 0 01 08 00 01 17 00 J0141-0928 00 59 31 48.7 164.1 -0.7 -13.8 -8 1 1 0 01 17 00 01 18 00 =0138-097 01 00 31 48.7 164.5 -0.7 -13.5 52 F 1 0 01 17 00 01 18 00 GL0134 01 00 31 49.0 167.0 -0.6 -11.3 -8 1 1 0 01 18 00 01 27 00 --- 01 09 33 49.4 170.4 -0.4 -8.4 532 F 1 0 01 18 00 01 27 00 J0141-0928 01 09 33 49.2 167.8 -0.5 -10.6 -8 1 1 0 01 27 00 01 28 00 =0138-097 01 10 33 49.2 168.2 -0.5 -10.3 52 F 1 0 01 27 00 01 28 00 GL0134 01 10 33 49.5 170.7 -0.4 -8.1 -8 1 1 0 01 28 00 01 37 00 --- 01 19 34 49.7 174.1 -0.3 -5.1 532 F 1 0 01 28 00 01 37 00 J0141-0928 01 19 34 49.6 171.6 -0.4 -7.4 -8 1 1 0 01 37 00 01 38 00 =0138-097 01 20 34 49.6 171.9 -0.4 -7.0 52 F 1 0 01 37 00 01 38 00 GL0134 01 20 34 49.7 174.5 -0.2 -4.8 -8 1 1 0 01 38 00 01 47 00 --- 01 29 36 49.9 178.0 -0.1 -1.8 532 F 1 0 01 38 00 01 47 00 J0141-0928 01 29 36 49.8 175.4 -0.2 -4.0 -8 1 1 0 01 47 00 01 48 00 =0138-097 01 30 36 49.8 175.7 -0.2 -3.7 52 F 1 0 01 47 00 Schedule for VLBA_FD (Code Fd ) Page 5 BW085 / Lens J0134-0931 / Winn and Keeton UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Sat 31 Dec 2005 Day 365 --- 01 48 00 GL0134 01 30 36 49.9 178.4 -0.1 -1.4 -8 1 1 0 01 48 00 01 57 00 --- 01 39 38 49.9 181.8 0.1 1.6 532 F 1 0 01 48 00 01 57 00 J0141-0928 01 39 38 49.9 179.2 0.0 -0.7 -8 1 1 0 01 57 00 01 58 00 =0138-097 01 40 38 49.9 179.6 0.0 -0.4 52 F 1 0 01 57 00 01 58 00 GL0134 01 40 38 49.9 182.2 0.1 1.9 -8 1 1 0 01 58 00 02 07 00 --- 01 49 39 49.7 185.6 0.2 4.9 532 F 1 0 01 58 00 02 07 00 J0141-0928 01 49 39 49.9 183.0 0.1 2.6 -8 1 1 0 02 07 00 02 08 00 =0138-097 01 50 39 49.9 183.4 0.1 3.0 52 F 1 0 02 07 00 02 10 00 J0237+2848 01 52 40 79.9 97.5 -0.8 -76.9 54 1 1 0 02 10 00 02 16 00 =0234+285 01 58 41 81.2 99.4 -0.7 -75.7 360 F 1 0 02 10 18 02 16 00 3C48 01 58 41 84.9 -58.4 0.3 118.9 -111 1 1 0 02 16 00 02 22 00 --- 02 04 42 83.8 -63.9 0.4 112.5 249 F 1 0 02 16 00 02 32 00 GL0134 02 14 43 48.8 195.0 0.7 13.0 421 1 1 0 02 32 00 02 41 00 --- 02 23 45 48.2 198.2 0.8 15.8 540 F 1 0 02 32 18 02 41 00 J0141-0928 02 23 45 48.7 195.8 0.7 13.7 -8 1 1 0 02 41 00 02 42 00 =0138-097 02 24 45 48.6 196.2 0.7 14.1 52 F 1 0 02 41 00 02 42 00 GL0134 02 24 45 48.1 198.6 0.8 16.2 -8 1 1 0 02 42 00 02 51 00 --- 02 33 46 47.5 201.8 1.0 18.9 532 F 1 0 02 42 00 02 51 00 J0141-0928 02 33 46 48.0 199.4 0.9 16.8 -8 1 1 0 02 51 00 02 52 00 =0138-097 02 34 47 47.9 199.7 0.9 17.1 52 F 1 0 02 51 00 02 52 00 GL0134 02 34 47 47.4 202.1 1.0 19.2 -8 1 1 0 02 52 00 03 01 00 --- 02 43 48 46.6 205.2 1.1 21.8 532 F 1 0 02 52 00 03 01 00 J0141-0928 02 43 48 47.2 202.9 1.0 19.8 -7 1 1 0 03 01 00 03 02 00 =0138-097 02 44 48 47.2 203.2 1.1 20.1 53 F 1 0 03 01 00 03 02 00 GL0134 02 44 48 46.5 205.5 1.2 22.1 -7 1 1 0 03 02 00 03 11 00 --- 02 53 50 45.6 208.4 1.3 24.5 533 F 1 0 03 02 00 03 11 00 J0141-0928 02 53 50 46.3 206.2 1.2 22.7 -7 1 1 0 03 11 00 03 12 00 =0138-097 02 54 50 46.2 206.6 1.2 23.0 53 F 1 0 03 11 00 Schedule for VLBA_FD (Code Fd ) Page 6 BW085 / Lens J0134-0931 / Winn and Keeton UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) SYNC ---------------------------------------------------------------------------------------- --- Sat 31 Dec 2005 Day 365 --- 03 12 00 GL0134 02 54 50 45.5 208.8 1.3 24.8 -7 1 1 0 03 12 00 03 21 00 --- 03 03 51 44.6 211.6 1.5 27.2 533 F 1 0 03 12 00 03 21 00 J0141-0928 03 03 51 45.3 209.5 1.4 25.4 -8 1 1 0 03 21 00 03 22 00 =0138-097 03 04 52 45.2 209.8 1.4 25.7 52 F 1 0 03 21 00 03 22 00 GL0134 03 04 52 44.4 211.9 1.5 27.4 -8 1 1 0 03 22 00 03 31 00 --- 03 13 53 43.4 214.6 1.6 29.7 532 F 1 0 03 22 00 03 31 00 J0141-0928 03 13 53 44.2 212.6 1.5 28.0 -8 1 1 0 03 31 00 03 32 00 =0138-097 03 14 53 44.1 212.9 1.6 28.3 52 F 1 0 03 31 00 03 32 00 GL0134 03 14 53 43.2 214.9 1.7 29.9 -8 1 1 0 03 32 00 03 41 00 --- 03 23 55 42.1 217.5 1.8 32.1 532 F 1 0 03 32 00 03 41 00 J0141-0928 03 23 55 43.0 215.6 1.7 30.5 -8 1 1 0 03 41 00 03 42 00 =0138-097 03 24 55 42.9 215.9 1.7 30.7 52 F 1 0 03 41 00 03 42 00 GL0134 03 24 55 42.0 217.8 1.8 32.3 -8 1 1 0 03 42 00 03 51 00 --- 03 33 56 40.7 220.3 2.0 34.3 532 F 1 0 03 42 00 03 51 00 J0141-0928 03 33 56 41.7 218.4 1.9 32.8 -8 1 1 0 03 51 00 03 52 00 =0138-097 03 34 56 41.6 218.7 1.9 33.0 52 F 1 0 03 51 00 03 52 00 GL0134 03 34 56 40.6 220.5 2.0 34.5 -8 1 1 0 03 52 00 04 01 00 --- 03 43 58 39.3 222.9 2.2 36.4 532 F 1 0 03 52 00 04 01 00 J0141-0928 03 43 58 40.3 221.1 2.0 35.0 -8 1 1 0 04 01 00 04 02 00 =0138-097 03 44 58 40.2 221.4 2.1 35.2 52 F 1 0 04 01 00 04 02 00 GL0134 03 44 58 39.2 223.1 2.2 36.6 -8 1 1 0 04 02 00 04 11 00 --- 03 54 00 37.8 225.4 2.3 38.4 532 F 1 0 04 02 00 04 11 00 J0141-0928 03 54 00 38.9 223.7 2.2 37.1 -8 1 1 0 04 11 00 04 12 00 =0138-097 03 55 00 38.7 224.0 2.2 37.3 52 F 1 0 04 11 00 04 12 00 GL0134 03 55 00 37.7 225.6 2.3 38.6 -8 1 1 0 04 12 00 04 15 00 --- 03 58 00 37.2 226.4 2.4 39.2 172 F 1 0 04 12 00 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: vlba.4cm Matches group v4cm_3 in /home/arana/cwalker/sched/catalogs/freq.dat Setup group: 4 Station: VLBA_FD Total bit rate: 256 Format: VLBA1:2 Bits per sample: 2 Sample rate: 16.000 Number of channels: 8 Speedup factor: 1.00 Disk used to record data. 1st LO= 7600.00 7600.00 7600.00 7600.00 7600.00 7600.00 7600.00 7600.00 Net SB= U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U U U U U U U IF = B D B D B D B D VLBA FE= omit 4cm omit 4cm VLBA Synth= 7.6 15.4 15.4 The following frequency sets based on this setup were used. Frequency Set: 4 Setup file default. Used pcal sets: 1 LO sum= 8399.49 8399.49 8407.49 8407.49 8415.49 8415.49 8423.49 8423.49 BBC fr= 799.49 799.49 807.49 807.49 815.49 815.49 823.49 823.49 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 510 510 510 510 6510 6510 6510 6510 PCALFR2= 510 510 510 510 6510 6510 6510 6510 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_off SOURCE LIST -- BW085 / Lens J0134-0931 / Winn and Keeton Catalog positions marked with *. Precession of date coordinates is based on stop time of first scan. Names used in schedule marked with *. Short names used in VLA and SNAP files marked with +. Observation date used in B1950/J2000 coordinate conversion (PRECDATE): 1979.900 No adjustments are made for rates (DRA, DDEC). Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * GL0134 01 32 06.404241 * 01 34 35.666870 01 34 53.889532 0.00 -09 46 23.09567 *-09 31 02.86710 -09 29 14.88792 0.00 From catalog imbedded in main SCHED input file. 4.700 scan hours, 288.045 baseline hours above horizon. J0137+3309 01 34 49.826428 * 01 37 41.299494 01 38 01.882241 0.90 0134+329 32 54 20.25964 * 33 09 35.13382 33 11 37.02034 0.91 * 3C48 /home/arana/cwalker/sched/catalogs/sources.vlba J0137+33 VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.100 scan hours, 4.946 baseline hours above horizon. * J0141-0928 01 38 56.858733 * 01 41 25.832165 01 41 44.059830 0.22 0138-097 -09 43 51.64872 *-09 28 43.67423 -09 26 56.90595 0.33 J0141-09 /home/arana/cwalker/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.516 scan hours, 25.273 baseline hours above horizon. * J0237+2848 02 34 55.589591 * 02 37 52.405678 02 38 14.073945 0.23 0234+285 28 35 11.40780 * 28 48 08.99005 28 49 53.77144 0.40 J0237+28 /home/arana/cwalker/sched/catalogs/sources.vlba VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.100 scan hours, 6.484 baseline hours above horizon. * J2253+1608 22 51 29.519743 * 22 53 57.747942 22 54 14.634144 0.31 2251+158 15 52 54.34803 * 16 08 53.56086 16 10 49.58108 0.20 3C454.3 /home/arana/cwalker/sched/catalogs/sources.vlba J2253+16 VLBA Calib Srcs - GSFC sols. - catalog 2004f_astro 0.100 scan hours, 6.491 baseline hours above horizon. 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) GL0134 98.4 3C48 113.8 J0141-0928 99.9 J0237+2848 125.7 J2253+1608 73.3 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