COVER INFORMATION Station: VLBA_HN (Code Hn ) Experiment: BK113C: R Leo and R Crt 3mm & 7mm SiO Exp. Code: BK113C Schedule Version: 3.00 Processed by SCHED version: NRAO internal release of 4 October 2004 PI: Athol Kemball Address: NCSA/UIUC 605 E. Springfield Ave Champaign, IL 61820 Phone: 217 244 2756 EMAIL: akemball@uiuc.edu Fax: 217 244 0287 Phone during observation: 217 384 5166 Observing mode: 3mm & 7mm Notes: Spectral line polarimetry at 3mm & 7mm Please ensure pulse cal is OFF Please use all available 3mm antennas Schedule for VLBA_HN (Code Hn ) Page 2 BK113C: R Leo and R Crt 3mm & 7mm SiO 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). 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) ---------------------------------------------------------------------------------------- --- Fri 31 Dec 2004 Day 366 --- ---------- Scan added by Sched for reference pointing ---------- 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 08 01 55 J0359+50 09 54 20 32.7 -48.4 5.9 60.4 0 1 1 0 Stopped 08 02 55 --- 09 55 20 32.6 -48.3 5.9 60.3 60 S 1 0 ---------- Scan added by Sched for reference pointing ---------- 08 02 55 J0359+50 09 55 20 32.6 -48.3 5.9 60.3 -4 1 1 0 Stopped 08 03 55 --- 09 56 20 32.4 -48.2 5.9 60.2 56 S 1 0 Next scan frequencies: 86244.07 86244.07 86252.07 86252.07 Next BBC frequencies: 744.07 744.07 752.07 752.07 Next scan bandwidths: 8.00 8.00 8.00 8.00 08 04 00 J0359+50 09 56 25 32.4 -48.2 5.9 60.1 0 1 1 0 08 03 55 08 17 00 --- 10 09 27 30.7 -47.0 6.2 58.3 780 F 1 5233 ---------- Scan added by Sched for reference pointing ---------- Next scan frequencies: 43123.38 43123.38 43223.38 43223.38 Next BBC frequencies: 723.38 723.38 823.38 823.38 Next scan bandwidths: 2.00 2.00 2.00 2.00 08 19 55 RLEO 10 12 23 58.0 191.4 0.4 8.5 10 1 1 5233 Stopped 08 20 55 --- 10 13 23 58.0 191.9 0.4 8.8 60 S 1 5233 Next scan frequencies: 86244.07 86244.07 86252.07 86252.07 Next BBC frequencies: 744.07 744.07 752.07 752.07 Next scan bandwidths: 8.00 8.00 8.00 8.00 08 21 00 RLEO 10 13 28 58.0 191.9 0.4 8.9 1 1 1 5233 08 20 55 08 45 00 --- 10 37 32 56.7 202.6 0.8 16.7 1440 F 1 14867 Schedule for VLBA_HN (Code Hn ) Page 3 BK113C: R Leo and R Crt 3mm & 7mm SiO 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). 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) ---------------------------------------------------------------------------------------- --- Fri 31 Dec 2004 Day 366 --- Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 Next scan bandwidths: 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 08 45 40 RLEO 10 38 12 56.6 202.9 0.8 16.9 35 1 2 14867 08 45 00 08 54 00 --- 10 46 33 56.0 206.4 1.0 19.4 500 R 1 16733 Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 08 56 00 RCRT 10 48 34 28.7 176.7 -0.2 -2.6 59 1 2 16733 08 54 30 09 12 00 --- 11 04 36 28.7 181.0 0.1 0.8 960 R 1 9733 Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 09 14 00 J0359+50 11 06 37 23.4 318.9 7.1 49.8 22 1 2 9733 09 12 30 09 21 00 --- 11 13 38 22.5 319.7 7.2 48.8 420 R 1 6333 Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 09 23 00 J0359+50 11 15 38 22.3 319.9 7.3 48.5 114 1 2 6333 09 23 00 09 30 00 --- 11 22 39 21.5 320.7 7.4 47.4 420 R 1 3533 ---------- Scan added by Sched for reference pointing ---------- 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 09 31 55 J0359+50 11 24 35 21.3 321.0 7.4 47.1 109 1 2 3533 Stopped 09 32 55 --- 11 25 35 21.2 321.1 7.4 47.0 60 S 1 3533 Schedule for VLBA_HN (Code Hn ) Page 4 BK113C: R Leo and R Crt 3mm & 7mm SiO 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). 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) ---------------------------------------------------------------------------------------- --- Fri 31 Dec 2004 Day 366 --- ---------- Scan added by Sched for reference pointing ---------- 09 32 55 J0359+50 11 25 35 21.2 321.1 7.4 47.0 -4 1 2 3533 Stopped 09 33 55 --- 11 26 35 21.0 321.2 7.4 46.8 56 S 1 3533 Next scan frequencies: 86244.07 86244.07 86252.07 86252.07 Next BBC frequencies: 744.07 744.07 752.07 752.07 Next scan bandwidths: 8.00 8.00 8.00 8.00 09 34 00 J0359+50 11 26 40 21.0 321.2 7.4 46.8 1 1 3 3533 09 33 55 09 47 00 --- 11 39 42 19.6 322.7 7.7 44.8 780 F 1 1700 ---------- Scan added by Sched for reference pointing ---------- Next scan frequencies: 43123.38 43123.38 43223.38 43223.38 Next BBC frequencies: 723.38 723.38 823.38 823.38 Next scan bandwidths: 2.00 2.00 2.00 2.00 09 49 55 RLEO 11 42 37 49.8 226.9 1.9 33.0 105 1 3 1700 Stopped 09 50 55 --- 11 43 38 49.7 227.2 1.9 33.2 60 S 1 1700 Next scan frequencies: 86244.07 86244.07 86252.07 86252.07 Next BBC frequencies: 744.07 744.07 752.07 752.07 Next scan bandwidths: 8.00 8.00 8.00 8.00 09 51 00 RLEO 11 43 43 49.7 227.2 1.9 33.2 1 1 3 1700 09 50 55 10 15 00 --- 12 07 47 46.3 234.4 2.3 37.4 1440 F 1 11334 Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 Next scan bandwidths: 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 10 15 40 RLEO 12 08 27 46.2 234.6 2.3 37.5 35 1 3 11334 10 15 00 10 24 00 --- 12 16 48 44.9 236.9 2.5 38.7 500 F 1 14934 Schedule for VLBA_HN (Code Hn ) Page 5 BK113C: R Leo and R Crt 3mm & 7mm SiO 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). 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) ---------------------------------------------------------------------------------------- --- Fri 31 Dec 2004 Day 366 --- Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 10 26 00 RCRT 12 18 48 26.1 200.7 1.3 15.8 76 1 4 14934 10 24 30 10 42 00 --- 12 34 51 25.0 204.7 1.6 18.8 960 R 1 13266 Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 10 44 00 J0359+50 12 36 51 13.7 329.9 8.6 35.7 31 1 4 13266 10 42 30 10 51 00 --- 12 43 53 13.1 330.8 8.7 34.6 420 R 1 9866 Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 10 53 00 J0359+50 12 45 53 12.9 331.1 8.8 34.2 114 1 4 9866 10 53 00 11 00 00 --- 12 52 54 12.3 332.0 8.9 33.1 420 R 1 7066 Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 11 45 40 RLEO 13 38 42 31.2 255.7 3.8 46.4 2683 1 4 7066 11 45 00 11 54 00 --- 13 47 03 29.7 257.3 4.0 46.8 500 R 1 3466 Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 11 56 00 RCRT 13 49 03 17.5 221.8 2.8 31.0 90 1 5 3466 11 54 30 12 12 00 --- 14 05 06 15.5 225.2 3.1 33.2 960 F 1 3534 Schedule for VLBA_HN (Code Hn ) Page 6 BK113C: R Leo and R Crt 3mm & 7mm SiO 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). 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) ---------------------------------------------------------------------------------------- --- Fri 31 Dec 2004 Day 366 --- Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 12 14 00 3C279 14 07 06 38.7 202.8 1.2 16.5 68 1 5 3534 12 12 30 12 21 00 --- 14 14 07 38.2 204.9 1.3 18.0 420 F 1 6934 Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 12 23 00 3C279 14 16 08 38.0 205.5 1.3 18.5 114 1 5 6934 12 23 00 12 30 00 --- 14 23 09 37.4 207.6 1.4 19.9 420 F 1 9734 Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 13 15 40 RLEO 15 08 56 14.8 271.9 5.4 48.3 2689 1 5 9734 13 15 00 13 24 00 --- 15 17 18 13.3 273.3 5.5 48.2 500 F 1 13334 Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 13 26 00 RCRT 15 19 18 4.8 239.4 4.3 H 41.6 91 1 6 13334 13 24 30 13 42 00 --- 15 35 21 2.2 242.2 4.6 D 43.0 0 R 1 14866 Next scan frequencies: 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 Next BBC frequencies: 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 13 44 00 3C279 15 37 21 29.1 227.4 2.7 32.8 60 1 6 14866 13 42 30 13 51 00 --- 15 44 22 28.2 229.0 2.8 33.8 420 R 1 11466 Schedule for VLBA_HN (Code Hn ) Page 7 BK113C: R Leo and R Crt 3mm & 7mm SiO 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). 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) ---------------------------------------------------------------------------------------- --- Fri 31 Dec 2004 Day 366 --- Next scan frequencies: 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 Next BBC frequencies: 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 13 53 00 3C279 15 46 22 27.9 229.5 2.8 34.0 114 1 6 11466 13 53 00 14 00 00 --- 15 53 24 26.9 231.1 2.9 35.0 420 R 1 8666 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: 4 Station: VLBA Total bit rate: 256 Format: NONE Bits per sample: 2 Sample rate: 32.000 Number of channels: 4 Passes/head pos: 0 Speedup factor: 0.00 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: 1 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 Frequency Set: 3 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 1 LO sum= 43123.38 43123.38 43223.38 43223.38 BBC fr= 723.38 723.38 823.38 823.38 Bandwd= 2.000 2.000 2.000 2.000 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 Track assignments are: barrel=roll_off Setup file: v3mm-sio.set Matches group v3mm_ff in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 3 Station: VLBA Total bit rate: 128 Format: VLBA1:4 Bits per sample: 2 Sample rate: 16.000 Number of channels: 4 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 85500.00 85500.00 85500.00 85500.00 Net SB= U U U U Pol. = RCP LCP RCP LCP BBC = 1 2 3 4 BBC SB= U U U U IF = 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: 2 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 1 LO sum= 86244.07 86244.07 86252.07 86252.07 BBC fr= 744.07 744.07 752.07 752.07 Bandwd= 8.000 8.000 8.000 8.000 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 Track assignments are: track1= 2, 18, 3, 19 barrel=roll_auto Setup file: v7mm-sio.set Matches group v7mm_b8 in /home/filehost/cwalker/sched/catalogs/freq.dat Setup group: 1 Station: VLBA Total bit rate: 128 Format: VLBA1:2 Bits per sample: 2 Sample rate: 8.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 2.00 Tape speeds: Low density - 133.330 ips, High density - 80.00 ips Time per pass for 17600 ft, High density tapes is: 00:44:00 1st LO= 42200.00 42200.00 42200.00 42200.00 42200.00 42200.00 42200.00 42200.00 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 = A C A C A C A C VLBA FE= 7mm omit 7mm omit VLBA Synth= 15.4 7.4 11.6 The following frequency sets based on this setup were used. Frequency Set: 4 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 2 LO sum= 43122.38 43122.38 43126.38 43126.38 42820.81 42820.81 42880.16 42880.16 BBC fr= 922.38 922.38 926.38 926.38 620.81 620.81 680.16 680.16 Bandwd= 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 Frequency Set: 5 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 2 LO sum= 43121.14 43121.14 43125.14 43125.14 42819.58 42819.58 42878.92 42878.92 BBC fr= 921.14 921.14 925.14 925.14 619.58 619.58 678.92 678.92 Bandwd= 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 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, 10, 18, 26, 3, 11, 19, 27 barrel=roll_auto SOURCE LIST -- BK113C: R Leo and R Crt 3mm & 7mm SiO 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) (B1950) (J2000) (Date) * RCRT 10 58 05.816739 * 11 00 33.827357 11 00 48.627973 -18 03 22.31578 *-18 19 29.60492 -18 20 57.07065 From catalog imbedded in main SCHED input file. Doppler based on LSR frame and radio definition. Velocities: 11.50 11.50 11.50 11.50 11.50 11.50 11.50 11.50 Proper motion used. Reference epoch: 1991.25000 At epoch: RA = 11 00 33.853900 Dec = -18 19 29.58100 Rates: RA = -27.49 mas/yr Dec = -1.74 mas/yr Paralax: 0.4500 mas. Planetary motion (includes proper motion). Ref. MJD: 53370.3451 Rates: RA = -0.52856E-05 s/day Dec = -0.47639E-05 arcsec/day * RLEO 09 44 52.219465 * 09 47 33.489867 09 47 50.158592 11 39 39.16106 * 11 25 43.05892 11 24 21.24333 From catalog imbedded in main SCHED input file. Doppler based on LSR frame and radio definition. Velocities: -2.40 -2.40 -2.40 -2.40 -2.40 -2.40 -2.40 -2.40 Proper motion used. Reference epoch: 1991.25000 At epoch: RA = 09 47 33.490400 Dec = 11 25 43.64600 Rates: RA = -0.57 mas/yr Dec = -42.70 mas/yr Paralax: 9.8700 mas. Planetary motion (includes proper motion). Ref. MJD: 53370.3451 Rates: RA = -0.10614E-06 s/day Dec = -0.11691E-03 arcsec/day J0359+5057 03 55 45.261360 * 03 59 29.747261 03 59 52.979748 0355+508 50 49 20.28556 * 50 57 50.16151 50 58 54.75627 * J0359+50 /home/filehost/cwalker/sched/catalogs/sources.vlba NRAO150 ICRF - Ext.1 Source - 1998 IERS Annual Report Doppler based on other sources. J1256-0547 12 53 35.831293 * 12 56 11.166560 12 56 26.076443 1253-055 -05 31 07.99572 *-05 47 21.52458 -05 48 57.02875 * 3C279 /home/filehost/cwalker/sched/catalogs/sources.vlba J1256-05 ICRF - Ext.1 Source - 1998 IERS Annual Report Doppler based on other sources. 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) RCRT 104.9 RLEO 134.8 J0359+50 137.8 3C279 84.9 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