COVER INFORMATION Station: VLBA_PT (Code Pt ) Experiment: 3mm observing with autopeak Exp. Code: BJ045E Schedule Version: 1.00 Processed by SCHED version: 6.05 June 2006 PI: Bill Junor Address: ISR-1, Space & Atmospheric Sciences MS D466, LANL, P.O. Box 1663 Los Alamos, New Mexico, 87545 U.S.A. Phone: 505 667 0788 EMAIL: bjunor@lanl.gov Fax: 505 665 7395 Phone during observation: 505 699 7692 Observing mode: 3mm 512-8-2 Notes: Will use reference pointing. COVER LETTER: BJ045 SUMMARY: This project needs about 40 hours times 28 baselines to meet the sensitivity requirements. This time can be accumulated in many separated sessions but MK should appear in all sessions. Each session should be a full track with all antennas to set the calibration and ensure full uv coverage. Tropospheric weather is the problem for these 3mm observations. 3C274 is mostly a night-time object now. 2 tapes per station. -------------------------------------------------------------------- Here is the official dynamic scheduling sheet: ================================================================ Preferred Dynamic Contraints. Alter [defaults] as desired. ================================================================ Equipment constraints: Stations. Below each station code, the "o" indicates an [optional] station that is to be used if it is available. Change "o" to "r" if the station is required or change "o" to "n" if the station is not to be used. SC HN NL FD LA PT KP OV BR MK n o o o o o o o n r Minimum number of stations [7]: May we swap PT for a single VLA antenna? [no] Consult http://www.aoc.nrao.edu/~gtaylor/y1gotcha.html to decide. If you adopt the default, then both PT and VLA1 must be in the stations list in the keyin file. Bands and polarizations. Below each band code, insert "R" if the righthand polarization is to be used, "L" if the lefthand polarization is to be used, "d" if dual polarizations are to be used, or "o" if the band is in your setups but scheduling should not be constrained by its availability. 90cm 50cm 20cm 13cm 6cm 4cm 2cm 1cm 7mm 3mm d Weather constraints: [appropriate for bands marked "L", "R", or "d" above and for at least the minimum number of stations] Best tropospheric conditions for 3mm. Date constraints: Preferred date(s), usually a series start [none]: Excluded dates plus reason [none]: Preferred interval between segments in days [none]: Special conditions (e.g., a series with different spacings in time) [See the comments at the top.]: Must include MK Schedule for VLBA_PT (Code Pt ) Page 2 3mm observing with autopeak 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. For disks, the footages are really the GBytes 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 ---------------------------------------------------------------------------------------- --- Thu 24 Aug 2006 Day 236 --- Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 17 31 04 3C273 08 30 00 25.7 106.4 -4.0 -52.5 0 1 1 0 Stopped 17 36 03 --- 08 35 00 26.7 107.2 -3.9 -52.1 299 S 1 0 Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 17 36 33 3C273 08 35 30 26.8 107.3 -3.9 -52.1 25 1 1 0 17 36 33 17 42 32 --- 08 41 30 28.0 108.3 -3.8 -51.7 359 F 1 4787 17 36 41 17 44 32 3C274 08 43 30 34.1 98.6 -3.8 -56.7 101 1 1 4787 17 44 32 17 55 30 --- 08 54 30 36.4 100.4 -3.6 -56.3 658 F 1 13563 17 44 40 17 56 00 3C274 08 55 00 36.5 100.5 -3.6 -56.3 25 1 2 13563 17 56 00 18 06 58 --- 09 06 00 38.7 102.4 -3.4 -55.7 658 R 1 12861 17 56 08 18 08 58 3C274 09 08 00 39.1 102.7 -3.4 -55.6 113 1 2 12861 18 08 58 18 19 56 --- 09 19 00 41.3 104.8 -3.2 -54.9 658 R 1 4085 18 09 06 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 18 20 26 3C273 09 19 30 35.3 115.5 -3.2 -48.2 12 1 2 4085 Stopped 18 25 25 --- 09 24 30 36.2 116.5 -3.1 -47.7 299 S 1 4085 Schedule for VLBA_PT (Code Pt ) Page 3 3mm observing with autopeak 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. For disks, the footages are really the GBytes 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 ---------------------------------------------------------------------------------------- --- Thu 24 Aug 2006 Day 236 --- Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 18 25 55 3C273 09 25 00 36.3 116.6 -3.1 -47.6 25 1 3 4085 18 25 55 18 31 54 --- 09 31 00 37.4 117.9 -3.0 -46.9 359 F 1 702 18 26 03 18 33 53 3C274 09 33 00 44.1 107.5 -3.0 -53.8 100 1 3 702 18 33 53 18 44 52 --- 09 44 00 46.2 109.7 -2.8 -52.7 658 F 1 9478 18 34 01 18 45 22 3C274 09 44 30 46.3 109.9 -2.8 -52.7 25 1 4 9478 18 45 22 18 56 20 --- 09 55 30 48.5 112.3 -2.6 -51.5 658 R 1 16946 18 45 30 18 58 19 3C274 09 57 30 48.8 112.8 -2.6 -51.2 113 1 4 16946 18 58 19 19 09 18 --- 10 08 30 50.9 115.4 -2.4 -49.8 658 R 1 8170 18 58 27 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 19 09 48 3C273 10 09 00 44.0 126.9 -2.3 -41.4 10 1 4 8170 Stopped 19 14 47 --- 10 14 00 44.9 128.2 -2.3 -40.5 299 S 1 8170 Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 19 15 17 3C273 10 14 30 44.9 128.4 -2.2 -40.4 25 1 4 8170 19 15 17 19 21 16 --- 10 20 30 45.9 130.0 -2.1 -39.3 359 R 1 3383 19 15 25 19 23 15 3C274 10 22 30 53.5 119.1 -2.1 -47.6 99 1 5 3383 19 23 15 19 34 14 --- 10 33 30 55.4 122.3 -2.0 -45.7 658 F 1 5392 19 23 23 Schedule for VLBA_PT (Code Pt ) Page 4 3mm observing with autopeak 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. For disks, the footages are really the GBytes 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 ---------------------------------------------------------------------------------------- --- Thu 24 Aug 2006 Day 236 --- 19 34 43 3C274 10 34 00 55.5 122.4 -2.0 -45.6 25 1 5 5392 19 34 43 19 45 42 --- 10 45 00 57.4 125.9 -1.8 -43.3 658 F 1 14168 19 34 51 19 47 41 3C274 10 47 00 57.7 126.5 -1.7 -42.8 113 1 6 14168 19 47 41 19 58 40 --- 10 58 00 59.5 130.4 -1.6 -40.1 658 R 1 12256 19 47 49 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 19 59 09 3C273 10 58 30 51.4 141.8 -1.5 -30.8 8 1 6 12256 Stopped 20 04 09 --- 11 03 30 52.0 143.5 -1.4 -29.4 299 S 1 12256 Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 20 04 39 3C273 11 04 00 52.1 143.7 -1.4 -29.3 25 1 6 12256 20 04 39 20 10 38 --- 11 10 00 52.8 145.9 -1.3 -27.6 359 R 1 7469 20 04 47 20 12 37 3C274 11 12 00 61.6 135.9 -1.3 -36.1 96 1 7 7469 20 12 37 20 23 35 --- 11 23 00 63.1 140.7 -1.1 -32.4 658 F 1 1307 20 12 45 20 24 05 3C274 11 23 30 63.2 140.9 -1.1 -32.2 25 1 7 1307 20 24 05 20 35 04 --- 11 34 30 64.6 146.2 -0.9 -28.1 658 F 1 10083 20 24 13 20 37 03 3C274 11 36 30 64.8 147.2 -0.9 -27.3 113 1 8 10083 20 37 03 20 48 01 --- 11 47 30 65.9 153.1 -0.7 -22.5 658 R 1 16341 20 37 11 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 20 48 31 3C273 11 48 00 56.3 161.1 -0.7 -15.5 5 1 8 16341 Stopped 20 53 31 --- 11 53 00 56.6 163.3 -0.6 -13.7 299 S 1 16341 Schedule for VLBA_PT (Code Pt ) Page 5 3mm observing with autopeak 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. For disks, the footages are really the GBytes 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 ---------------------------------------------------------------------------------------- --- Thu 24 Aug 2006 Day 236 --- Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 20 54 00 3C273 11 53 30 56.6 163.5 -0.6 -13.6 25 1 8 16341 20 54 00 20 59 59 --- 11 59 30 57.0 166.2 -0.5 -11.4 359 R 1 11554 20 54 08 21 01 59 3C274 12 01 30 67.0 161.2 -0.5 -15.9 94 1 8 11554 21 01 59 21 12 57 --- 12 12 30 67.6 167.9 -0.3 -10.2 658 R 1 2778 21 02 07 21 13 27 3C274 12 13 00 67.7 168.3 -0.3 -9.9 25 1 9 2778 21 13 27 21 24 25 --- 12 24 00 68.0 175.3 -0.1 -3.9 658 F 1 5998 21 13 35 21 26 25 3C274 12 26 00 68.0 176.6 -0.1 -2.8 113 1 9 5998 21 26 25 21 37 23 --- 12 37 00 68.0 183.8 0.1 3.2 658 F 1 14774 21 26 33 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 21 37 53 3C273 12 37 30 57.7 183.8 0.1 3.1 3 1 9 14774 Stopped 21 42 52 --- 12 42 30 57.6 186.1 0.2 5.0 299 S 1 14774 Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 21 43 22 3C273 12 43 00 57.6 186.3 0.2 5.2 25 1 10 14774 21 43 22 21 49 21 --- 12 49 00 57.4 189.1 0.3 7.5 359 R 1 15639 21 43 30 21 51 21 3C274 12 51 00 67.6 192.8 0.3 10.8 93 1 10 15639 21 51 21 22 02 19 --- 13 02 00 67.0 199.6 0.5 16.5 658 R 1 6863 21 51 29 Schedule for VLBA_PT (Code Pt ) Page 6 3mm observing with autopeak 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. For disks, the footages are really the GBytes 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 ---------------------------------------------------------------------------------------- --- Thu 24 Aug 2006 Day 236 --- 22 02 49 3C274 13 02 30 66.9 199.9 0.5 16.7 25 1 11 6863 22 02 49 22 13 47 --- 13 13 30 66.0 206.2 0.7 21.9 658 F 1 1913 22 02 57 22 15 47 3C274 13 15 30 65.9 207.3 0.7 22.9 113 1 11 1913 22 15 47 22 26 45 --- 13 26 30 64.7 213.1 0.9 27.5 658 F 1 10689 22 15 55 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 22 27 15 3C273 13 27 00 55.0 205.7 1.0 21.0 5 1 11 10689 Stopped 22 32 14 --- 13 32 00 54.6 207.7 1.0 22.6 299 S 1 10689 Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 22 32 44 3C273 13 32 30 54.5 207.9 1.1 22.8 25 1 11 10689 22 32 44 22 38 43 --- 13 38 30 53.9 210.2 1.2 24.6 359 F 1 15476 22 32 52 22 40 43 3C274 13 40 30 63.0 219.9 1.2 32.8 96 1 12 15476 22 40 43 22 51 41 --- 13 51 30 61.5 224.6 1.3 36.4 658 R 1 10948 22 40 51 22 52 11 3C274 13 52 00 61.4 224.8 1.3 36.6 25 1 12 10948 22 52 11 23 03 09 --- 14 03 00 59.7 229.1 1.5 39.7 658 R 1 2172 22 52 19 23 05 09 3C274 14 05 00 59.4 229.8 1.6 40.3 113 1 13 2172 23 05 09 23 16 07 --- 14 16 00 57.6 233.7 1.7 43.0 658 F 1 6604 23 05 17 Next scan frequencies: 43115.99 43115.99 43215.99 43215.99 Next BBC frequencies: 715.99 715.99 815.99 815.99 Next scan bandwidths: 16.00 16.00 16.00 16.00 23 16 37 3C273 14 16 30 49.2 223.5 1.8 34.7 7 1 13 6604 Stopped 23 21 36 --- 14 21 30 48.5 225.1 1.9 35.8 299 S 1 6604 Schedule for VLBA_PT (Code Pt ) Page 7 3mm observing with autopeak 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. For disks, the footages are really the GBytes 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 ---------------------------------------------------------------------------------------- --- Thu 24 Aug 2006 Day 236 --- Next scan frequencies: 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 Next BBC frequencies: 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 23 22 06 3C273 14 22 00 48.4 225.2 1.9 35.9 25 1 13 6604 23 22 06 23 28 05 --- 14 28 00 47.5 227.0 2.0 37.2 359 F 1 11391 23 22 14 23 30 05 3C274 14 30 00 55.2 238.1 2.0 45.9 98 1 14 11391 23 30 05 23 41 03 --- 14 41 00 53.3 241.2 2.2 47.9 658 R 1 15034 23 30 13 23 41 33 3C274 14 41 30 53.2 241.4 2.2 47.9 25 1 14 15034 23 41 33 23 52 31 --- 14 52 30 51.2 244.3 2.4 49.6 658 R 1 6258 23 41 41 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: /home/filehost/cwalker/sched/setups/pt7mm.set Matches group v7mm_c8 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 12 Station: VLBA_PT Total bit rate: 256 Format: NONE Bits per sample: 2 Sample rate: 32.000 Number of channels: 4 Setup not used for recording data. 1st LO= 42400.00 42400.00 42400.00 42400.00 Net SB= U U U U Pol. = RCP LCP RCP LCP BBC = 1 2 3 4 BBC SB= U U U U IF = A C A C VLBA FE= 7mm omit 7mm omit VLBA Synth= 15.4 7.6 11.6 The following frequency sets based on this setup were used. Frequency Set: 4 Setup file default. Used pcal sets: 1 LO sum= 43115.99 43115.99 43215.99 43215.99 BBC fr= 715.99 715.99 815.99 815.99 Bandwd= 16.000 16.000 16.000 16.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = OFF PCALXB1= S1 S2 S3 S4 OFF OFF OFF OFF PCALXB2= M1 M2 M3 M4 OFF OFF OFF OFF PCALFR1= 0 0 0 0 0 0 0 0 PCALFR2= 0 0 0 0 0 0 0 0 Setup file: v3mm-512-8-2.set Matches group v3mm_ff in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 4 Station: VLBA_PT Total bit rate: 512 Format: VLBA1:4 Bits per sample: 2 Sample rate: 32.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 1.00 Tape used at high density at 160.000 ips. Time per pass is 22.00 minutes. Two tape drives will be used. Required by this setup. 1st LO= 85500.00 85500.00 85500.00 85500.00 85500.00 85500.00 85500.00 85500.00 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 3mm omit 3mm VLBA Synth= 12.9 15.4 12.1 The following frequency sets based on this setup were used. Frequency Set: 11 Setup file default. Used pcal sets: 2 LO sum= 86212.49 86212.49 86228.49 86228.49 86244.49 86244.49 86260.49 86260.49 BBC fr= 712.49 712.49 728.49 728.49 744.49 744.49 760.49 760.49 Bandwd= 16.000 16.000 16.000 16.000 16.000 16.000 16.000 16.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 2 PCAL = OFF PCALXB1= S1 S2 S3 S4 S5 S6 S7 S8 PCALXB2= M1 M2 M3 M4 M5 M6 M7 M8 PCALFR1= 0 0 0 0 0 0 0 0 PCALFR2= 0 0 0 0 0 0 0 0 Track assignments are: track1= 2, 18, 3, 19, 66, 82, 67, 83 barrel=roll_auto SOURCE LIST -- 3mm observing with autopeak 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) J1229+0203 12 26 33.245836 * 12 29 06.699732 12 29 26.240492 0.30 1226+023 02 19 43.30565 * 02 03 08.59815 02 01 01.96093 0.20 * 3C273 /home/filehost/cwalker/sched/catalogs/sources.vlba 3C273B VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro J1229+02 0.798 scan hours, 20.245 baseline hours above horizon. J1230+1223 12 28 17.569279 * 12 30 49.423381 12 31 08.838164 0.31 1228+126 12 40 01.74901 * 12 23 28.04383 12 21 23.38997 0.20 * 3C274 /home/filehost/cwalker/sched/catalogs/sources.vlba J1230+12 VLBA Calib Survey - GSFC sols. - created L.Petrov 2005f_astro 4.205 scan hours, 110.065 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) 3C273 34.7 3C274 33.5 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