Session Notes for crf104 Prepared by K. Le Bail, NVI, Inc./GSFC and Alet de Witt, HartRAO ================================================================ PURPOSE AND GENERAL NOTES ================================================================ The purpose of this CRF session is to perform astrometric observations in order to strenghten the ICRF in the southern sky. The scheduling technique basically continues the technique used by Alan Fey in previous CRF sessions; however, this session uses five additional sources in the south provided by Alet de Witt. The scheduling strategy follows the template of CRF98: the scan length is 6 minutes for each source with a default flux value of 0.60 Jy in both X- and S-band. However we modified the frequency mode from to 256-16N. The source list (43 sources) was modified by replacing five of the sources by five other sources that had less than ten observations (as found in the most recent S/X catalog) as well as K-band and Ka-band sources not in the S/X catalog but that are potential targets. =========================================================== ----- Parameter listing -------------------------------------- Experiment: CRF104 Description tbd Scheduler: NASA Correlator: SHAO Start: 2018-009-17:30:00 End: 2018-010-17:30:00 Current yyyyddd: 2018009 (2018.02) ( 18128 MJD, TUES 9JAN.) Greenwich sidereal time: 00:46:48 (17:30:00 UT) Sun's RA and DEC: 19h 24.0m -22d 2.0 =========================================================== First observations Observation listing from file ./crf104.skd for experiment CRF104 Source Start DURATIONS name yyddd-hhmmss Ht Ho K1 Ke Kk Km Nt Yg 1055+018 18009-173000| 360 360 360 360 360 360| 2351-154 18009-173000| 360 360 | 2255-282 18009-173654| 360 360 | 1244-255 18009-173740| 360 360 360 360 360| 0524+034 18009-174544| 360 360 360 360 360 360| End of listing. =========================================================== Observation listing from file ./crf104.skd for experiment CRF104 Source Start DURATIONS name yyddd-hhmmss Ht Ho K1 Ke Kk Km Nt Yg 2126-158 18010-170724| 360 360 | 1334-127 18010-170838| 360 360 360 360 360| 2059+034 18010-171412| 360 360 | 1244-255 18010-171554| 360 360 360 360 360| 0019+058 18010-172142| 360 360 | 1130+009 18010-172334| 360 360 360 360 360 360| End of listing. =========================================================== SKED Summary from file ./crf104.skd for experiment CRF104 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 8.2 Min = 0.0 Max = 28.0 (Baseline Ho-Nt on 1456+044) RMS = 5.1 Total time: 1440 minutes ( 24.0 hours). Key: Ht=HART15M Ho=HOBART26 K1=KASHIM11 Ke=KATH12M Kk=KOKEE Km=KUNMING Nt=NOTO Yg=YARRA12M Ht Ho K1 Ke Kk Km Nt Yg Avg % obs. time: 50 74 75 77 52 68 38 77 64 % cal. time: 1 2 2 2 1 2 1 2 2 % slew time: 5 20 3 6 4 12 6 6 8 % idle time: 42 4 20 14 42 17 54 14 26 total # scans: 120 177 179 184 124 163 90 184 152 # scans/hour : 5 7 7 8 5 7 4 8 6 Avg scan (sec): 360 360 360 360 360 360 360 360 360 # data tracks: 16 16 16 16 16 16 16 16 # Mk5 tracks: 16 16 16 16 16 16 16 16 Total TB(M5): 1.38 2.04 2.06 2.12 1.43 1.88 1.04 2.12 1.76 # OF OBSERVATIONS BY BASELINE | Ht Ho K1 Ke Kk Km Nt Yg Total -------------------------------------------------- Ht| 41 47 49 0 71 90 52 350 Ho| 170 176 124 132 11 173 827 K1| 175 119 139 17 172 839 Ke| 124 140 19 181 864 Kk| 81 0 121 569 Km| 41 143 747 Nt| 22 200 Yg| 864 Number of 2-station scans: 51 Number of 3-station scans: 17 Number of 4-station scans: 14 Number of 5-station scans: 47 Number of 6-station scans: 119 Number of 7-station scans: 9 Number of 8-station scans: 0 Total number of scans: 257 Total number of obs: 2630 Total integrated obs-time: 946800 Average obs-time: 360.0 Average X-band SNRs by baseline | Ht Ho K1 Ke Kk Km Nt Yg AVG ------------------------------------------------- Ht| 62 23 34 - 97 75 31 59 Ho| 22 34 51 95 72 31 45 K1| 12 19 34 27 11 19 Ke| 28 52 40 17 28 Kk| 78 - 25 38 Km| 114 47 66 Nt| 37 71 Yg| 26 Average S-band SNRs by baseline | Ht Ho K1 Ke Kk Km Nt Yg AVG ------------------------------------------------- Ht| 52 39 31 - 95 71 32 58 Ho| 31 25 61 76 56 26 42 K1| 18 45 56 42 19 33 Ke| 36 44 33 15 27 Kk| 110 - 38 54 Km| 102 47 68 Nt| 35 66 Yg| 28 =========================================================== Recording mode Name Code CDP-SXN SX Recording mode for: HART15M HOBART26 KASHIM11 KATH12M KUNMING NOTO YARRA12M Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:2 256 Mbits 128 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 8.00 MHz 1 16(*2) 32 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 10.00 6.00 16.00 Recording mode for: KOKEE Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 256 Mbits 128 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 8.00 MHz 1 16(*1) 16 X-band spanned bw= 360.0 MHz rms spanned bw= 140.2 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 10.00 6.00 16.00 =========================================================== Tape types ID Station Tape length Density Passes Ht HART15M Mark5B Ho HOBART26 Mark5B K1 KASHIM11 K5 Ke KATH12M Mark5B Kk KOKEE Mark5B Km KUNMING Mark5B Nt NOTO Mark5B Yg YARRA12M Mark5B =========================================================== SNR targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 3) X-band (ast_margin 0) S-band (ast_margin 0) Ht Ho K1 Ke Kk Km Nt Ht Ho K1 Ke Kk Km Nt Ho 14 Ho 12 K1 12 12 K1 12 12 Ke 14 14 12 Ke 12 12 12 Kk 14 14 12 14 Kk 12 12 12 12 Km 14 14 12 14 14 Km 12 12 12 12 12 Nt 14 14 12 14 14 14 Nt 12 12 12 12 12 12 Yg 14 14 12 14 14 14 14 Yg 12 12 12 12 12 12 12 ===========================================================