COVER INFORMATION Station: VLBA_LA (Code La ) 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_LA (Code La ) 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 47 49 20.0 118.6 -3.8 -46.2 0 1 1 0 Stopped 22 20 00 --- 21 52 50 20.9 119.5 -3.7 -45.7 300 S 1 0 22 30 00 GL0134 22 02 51 22.7 121.4 -3.5 -44.6 590 1 1 0 22 30 00 22 39 00 --- 22 11 53 24.2 123.1 -3.4 -43.5 540 F 1 0 22 30 18 22 39 00 J0141-0928 22 11 53 23.1 121.8 -3.5 -44.4 -8 1 1 0 22 39 00 22 40 00 =0138-097 22 12 53 23.2 122.0 -3.5 -44.2 52 F 1 0 22 39 00 22 40 00 GL0134 22 12 53 24.4 123.3 -3.4 -43.4 -8 1 1 0 22 40 00 22 49 00 --- 22 21 54 25.9 125.1 -3.2 -42.3 532 F 1 0 22 40 00 22 49 00 J0141-0928 22 21 54 24.8 123.7 -3.3 -43.2 -8 1 1 0 22 49 00 22 50 00 =0138-097 22 22 55 24.9 123.9 -3.3 -43.0 52 F 1 0 22 49 00 22 50 00 GL0134 22 22 55 26.0 125.3 -3.2 -42.1 -8 1 1 0 22 50 00 22 59 00 --- 22 31 56 27.5 127.2 -3.0 -40.9 532 F 1 0 22 50 00 22 59 00 J0141-0928 22 31 56 26.4 125.8 -3.2 -41.9 -8 1 1 0 22 59 00 23 00 00 =0138-097 22 32 56 26.6 126.0 -3.1 -41.7 52 F 1 0 22 59 00 23 00 00 GL0134 22 32 56 27.7 127.4 -3.0 -40.8 -8 1 1 0 23 00 00 23 09 00 --- 22 41 58 29.1 129.3 -2.9 -39.5 532 F 1 0 23 00 00 23 09 00 J0141-0928 22 41 58 28.1 127.8 -3.0 -40.5 -8 1 1 0 23 09 00 23 10 00 =0138-097 22 42 58 28.2 128.1 -3.0 -40.4 52 F 1 0 23 09 00 23 10 00 GL0134 22 42 58 29.3 129.6 -2.9 -39.4 -8 1 1 0 23 10 00 23 19 00 --- 22 51 59 30.7 131.6 -2.7 -38.0 532 F 1 0 23 10 00 23 19 00 J0141-0928 22 51 59 29.6 130.0 -2.8 -39.0 -8 1 1 0 23 19 00 23 20 00 =0138-097 22 53 00 29.8 130.2 -2.8 -38.9 52 F 1 0 23 19 00 23 20 00 GL0134 22 53 00 30.8 131.8 -2.7 -37.8 -8 1 1 0 23 20 00 23 29 00 --- 23 02 01 32.2 133.9 -2.5 -36.4 532 F 1 0 23 20 00 Schedule for VLBA_LA (Code La ) 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 02 01 31.2 132.3 -2.7 -37.5 -8 1 1 0 23 29 00 23 30 00 =0138-097 23 03 01 31.3 132.5 -2.6 -37.3 52 F 1 0 23 29 00 23 30 00 GL0134 23 03 01 32.3 134.1 -2.5 -36.2 -8 1 1 0 23 30 00 23 39 00 --- 23 12 03 33.6 136.3 -2.4 -34.7 532 F 1 0 23 30 00 23 39 00 J0141-0928 23 12 03 32.7 134.6 -2.5 -35.8 -8 1 1 0 23 39 00 23 40 00 =0138-097 23 13 03 32.8 134.8 -2.5 -35.7 52 F 1 0 23 39 00 23 40 00 GL0134 23 13 03 33.7 136.5 -2.4 -34.5 -8 1 1 0 23 40 00 23 49 00 --- 23 22 04 35.0 138.8 -2.2 -32.8 532 F 1 0 23 40 00 23 49 00 J0141-0928 23 22 04 34.1 137.0 -2.3 -34.1 -8 1 1 0 23 49 00 23 50 00 =0138-097 23 23 04 34.2 137.3 -2.3 -33.9 52 F 1 0 23 49 00 23 50 00 GL0134 23 23 04 35.1 139.0 -2.2 -32.6 -8 1 1 0 23 50 00 23 59 00 --- 23 32 06 36.3 141.3 -2.0 -30.9 532 F 1 0 23 50 00 23 59 00 J0141-0928 23 32 06 35.4 139.5 -2.2 -32.3 -8 1 1 0 23 59 00 23 59 59 =0138-097 23 33 06 35.6 139.8 -2.1 -32.1 51 F 1 0 23 59 00 --- Sat 31 Dec 2005 Day 365 --- 00 00 00 GL0134 23 33 06 36.4 141.6 -2.0 -30.7 -8 1 1 0 00 00 00 00 09 00 --- 23 42 08 37.5 144.0 -1.9 -28.9 532 F 1 0 00 00 18 00 09 00 J0141-0928 23 42 08 36.7 142.2 -2.0 -30.3 -8 1 1 0 00 09 00 00 10 00 =0138-097 23 43 08 36.8 142.4 -2.0 -30.1 52 F 1 0 00 09 00 00 12 00 J2253+1608 23 45 08 67.4 213.3 0.8 27.7 53 1 1 0 00 12 00 00 18 00 =2251+158 23 51 09 66.7 216.6 0.9 30.2 360 F 1 0 00 12 18 00 18 00 GL0134 23 51 09 38.6 146.5 -1.7 -27.0 -62 1 1 0 00 18 00 00 27 00 --- 00 00 11 39.5 149.1 -1.6 -25.0 478 F 1 0 00 18 00 00 27 00 J0141-0928 00 00 11 38.8 147.1 -1.7 -26.5 -7 1 1 0 00 27 00 00 28 00 =0138-097 00 01 11 38.9 147.4 -1.7 -26.3 53 F 1 0 00 27 00 00 28 00 GL0134 00 01 11 39.6 149.4 -1.6 -24.8 -7 1 1 0 00 28 00 00 37 00 --- 00 10 12 40.5 152.0 -1.4 -22.7 533 F 1 0 00 28 00 00 37 00 J0141-0928 00 10 12 39.9 150.0 -1.5 -24.3 -7 1 1 0 00 37 00 00 38 00 =0138-097 00 11 12 40.0 150.3 -1.5 -24.0 53 F 1 0 00 37 00 Schedule for VLBA_LA (Code La ) 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 11 12 40.6 152.4 -1.4 -22.4 -7 1 1 0 00 38 00 00 47 00 --- 00 20 14 41.4 155.1 -1.2 -20.3 533 F 1 0 00 38 00 00 47 00 J0141-0928 00 20 14 40.9 153.0 -1.4 -21.9 -7 1 1 0 00 47 00 00 48 00 =0138-097 00 21 14 41.0 153.3 -1.3 -21.7 53 F 1 0 00 47 00 00 48 00 GL0134 00 21 14 41.5 155.4 -1.2 -20.0 -7 1 1 0 00 48 00 00 57 00 --- 00 30 16 42.2 158.2 -1.1 -17.8 533 F 1 0 00 48 00 00 57 00 J0141-0928 00 30 16 41.7 156.1 -1.2 -19.5 -7 1 1 0 00 57 00 00 58 00 =0138-097 00 31 16 41.8 156.4 -1.2 -19.2 53 F 1 0 00 57 00 00 58 00 GL0134 00 31 16 42.3 158.6 -1.1 -17.5 -7 1 1 0 00 58 00 01 07 00 --- 00 40 17 42.9 161.5 -0.9 -15.2 533 F 1 0 00 58 00 01 07 00 J0141-0928 00 40 17 42.5 159.2 -1.0 -17.0 -7 1 1 0 01 07 00 01 08 00 =0138-097 00 41 17 42.6 159.6 -1.0 -16.7 53 F 1 0 01 07 00 01 08 00 GL0134 00 41 17 43.0 161.8 -0.9 -14.9 -7 1 1 0 01 08 00 01 17 00 --- 00 50 19 43.5 164.8 -0.7 -12.5 533 F 1 0 01 08 00 01 17 00 J0141-0928 00 50 19 43.2 162.5 -0.9 -14.3 -7 1 1 0 01 17 00 01 18 00 =0138-097 00 51 19 43.2 162.8 -0.8 -14.1 53 F 1 0 01 17 00 01 18 00 GL0134 00 51 19 43.6 165.1 -0.7 -12.2 -7 1 1 0 01 18 00 01 27 00 --- 01 00 20 44.0 168.1 -0.6 -9.8 533 F 1 0 01 18 00 01 27 00 J0141-0928 01 00 20 43.7 165.8 -0.7 -11.6 -8 1 1 0 01 27 00 01 28 00 =0138-097 01 01 21 43.8 166.1 -0.7 -11.4 52 F 1 0 01 27 00 01 28 00 GL0134 01 01 21 44.1 168.5 -0.6 -9.5 -8 1 1 0 01 28 00 01 37 00 --- 01 10 22 44.4 171.5 -0.4 -7.0 532 F 1 0 01 28 00 01 37 00 J0141-0928 01 10 22 44.2 169.2 -0.5 -8.9 -8 1 1 0 01 37 00 01 38 00 =0138-097 01 11 22 44.2 169.5 -0.5 -8.6 52 F 1 0 01 37 00 01 38 00 GL0134 01 11 22 44.4 171.9 -0.4 -6.7 -8 1 1 0 01 38 00 01 47 00 --- 01 20 24 44.6 175.0 -0.2 -4.1 532 F 1 0 01 38 00 01 47 00 J0141-0928 01 20 24 44.5 172.6 -0.4 -6.1 -8 1 1 0 01 47 00 01 48 00 =0138-097 01 21 24 44.5 173.0 -0.3 -5.8 52 F 1 0 01 47 00 Schedule for VLBA_LA (Code La ) 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 21 24 44.6 175.3 -0.2 -3.8 -8 1 1 0 01 48 00 01 57 00 --- 01 30 25 44.7 178.4 -0.1 -1.3 532 F 1 0 01 48 00 01 57 00 J0141-0928 01 30 25 44.7 176.1 -0.2 -3.2 -8 1 1 0 01 57 00 01 58 00 =0138-097 01 31 26 44.7 176.4 -0.2 -2.9 52 F 1 0 01 57 00 01 58 00 GL0134 01 31 26 44.7 178.8 -0.1 -1.0 -8 1 1 0 01 58 00 02 07 00 --- 01 40 27 44.7 181.9 0.1 1.6 532 F 1 0 01 58 00 02 07 00 J0141-0928 01 40 27 44.8 179.6 0.0 -0.4 -8 1 1 0 02 07 00 02 08 00 =0138-097 01 41 27 44.8 179.9 0.0 -0.1 52 F 1 0 02 07 00 02 10 00 J0237+2848 01 43 27 76.5 117.1 -0.9 -55.5 51 1 1 0 02 10 00 02 16 00 =0234+285 01 49 28 77.6 120.6 -0.8 -52.9 360 F 1 0 02 10 18 02 16 00 3C48 01 49 28 86.5 223.2 0.2 41.6 -74 1 1 0 02 16 00 02 22 00 --- 01 55 29 85.6 235.6 0.3 53.1 286 F 1 0 02 16 00 02 32 00 GL0134 02 05 31 44.2 190.6 0.5 8.7 511 1 1 0 02 32 00 02 41 00 --- 02 14 33 43.8 193.6 0.7 11.2 540 F 1 0 02 32 18 02 41 00 J0141-0928 02 14 33 44.1 191.3 0.5 9.3 -7 1 1 0 02 41 00 02 42 00 =0138-097 02 15 33 44.1 191.6 0.6 9.6 53 F 1 0 02 41 00 02 42 00 GL0134 02 15 33 43.7 193.9 0.7 11.4 -7 1 1 0 02 42 00 02 51 00 --- 02 24 34 43.2 196.9 0.8 13.9 533 F 1 0 02 42 00 02 51 00 J0141-0928 02 24 34 43.7 194.7 0.7 12.0 -7 1 1 0 02 51 00 02 52 00 =0138-097 02 25 34 43.6 195.0 0.7 12.3 53 F 1 0 02 51 00 02 52 00 GL0134 02 25 34 43.2 197.3 0.8 14.1 -7 1 1 0 02 52 00 03 01 00 --- 02 34 36 42.6 200.2 1.0 16.5 533 F 1 0 02 52 00 03 01 00 J0141-0928 02 34 36 43.1 198.0 0.9 14.7 -7 1 1 0 03 01 00 03 02 00 =0138-097 02 35 36 43.0 198.3 0.9 15.0 53 F 1 0 03 01 00 03 02 00 GL0134 02 35 36 42.5 200.5 1.0 16.8 -7 1 1 0 03 02 00 03 11 00 --- 02 44 38 41.8 203.4 1.2 19.0 533 F 1 0 03 02 00 03 11 00 J0141-0928 02 44 38 42.4 201.2 1.0 17.3 -7 1 1 0 03 11 00 03 12 00 =0138-097 02 45 38 42.3 201.5 1.1 17.6 53 F 1 0 03 11 00 Schedule for VLBA_LA (Code La ) 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 45 38 41.8 203.7 1.2 19.3 -7 1 1 0 03 12 00 03 21 00 --- 02 54 39 41.0 206.5 1.3 21.5 533 F 1 0 03 12 00 03 21 00 J0141-0928 02 54 39 41.6 204.4 1.2 19.8 -7 1 1 0 03 21 00 03 22 00 =0138-097 02 55 39 41.5 204.7 1.2 20.1 53 F 1 0 03 21 00 03 22 00 GL0134 02 55 39 40.9 206.8 1.3 21.7 -7 1 1 0 03 22 00 03 31 00 --- 03 04 41 40.0 209.5 1.5 23.9 533 F 1 0 03 22 00 03 31 00 J0141-0928 03 04 41 40.7 207.4 1.4 22.3 -7 1 1 0 03 31 00 03 32 00 =0138-097 03 05 41 40.6 207.7 1.4 22.5 53 F 1 0 03 31 00 03 32 00 GL0134 03 05 41 39.9 209.8 1.5 24.1 -7 1 1 0 03 32 00 03 41 00 --- 03 14 42 39.0 212.4 1.7 26.1 533 F 1 0 03 32 00 03 41 00 J0141-0928 03 14 42 39.7 210.4 1.5 24.6 -7 1 1 0 03 41 00 03 42 00 =0138-097 03 15 43 39.6 210.7 1.6 24.8 53 F 1 0 03 41 00 03 42 00 GL0134 03 15 43 38.9 212.7 1.7 26.3 -7 1 1 0 03 42 00 03 51 00 --- 03 24 44 37.9 215.2 1.8 28.3 533 F 1 0 03 42 00 03 51 00 J0141-0928 03 24 44 38.7 213.3 1.7 26.8 -8 1 1 0 03 51 00 03 52 00 =0138-097 03 25 44 38.6 213.6 1.7 27.1 52 F 1 0 03 51 00 03 52 00 GL0134 03 25 44 37.7 215.4 1.8 28.5 -8 1 1 0 03 52 00 04 01 00 --- 03 34 46 36.6 217.9 2.0 30.3 532 F 1 0 03 52 00 04 01 00 J0141-0928 03 34 46 37.5 216.1 1.9 29.0 -8 1 1 0 04 01 00 04 02 00 =0138-097 03 35 46 37.4 216.3 1.9 29.2 52 F 1 0 04 01 00 04 02 00 GL0134 03 35 46 36.5 218.1 2.0 30.5 -8 1 1 0 04 02 00 04 11 00 --- 03 44 47 35.4 220.5 2.2 32.3 532 F 1 0 04 02 00 04 11 00 J0141-0928 03 44 47 36.3 218.7 2.1 31.0 -8 1 1 0 04 11 00 04 12 00 =0138-097 03 45 48 36.2 219.0 2.1 31.2 52 F 1 0 04 11 00 04 12 00 GL0134 03 45 48 35.2 220.7 2.2 32.5 -8 1 1 0 04 12 00 04 15 00 --- 03 48 48 34.8 221.5 2.2 33.0 172 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: 5 Station: VLBA_LA 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: 5 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