Session Notes for crf107 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 and we use a 1Gbps narrow-band mode currently used to schedule AOV sessions. The scheduling strategy follows the template of previous CRF sessions: the scan length is 5 minutes for each source with a default flux value of 0.50 Jy in both X- and S-band. The source list (43 sources) is the source list of CRF104. It 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. Koganei and Fortleza are tagged along to test the frequency mode on these stations. =========================================================== ----- Parameter listing -------------------------------------- Experiment: CRF107 Description tbd Scheduler: HART Correlator: SHAO Start: 2018-177-17:30:00 End: 2018-178-17:30:00 Current yyyyddd: 2018177 (2018.48) ( 18296 MJD, TUES 26JUN.) Greenwich sidereal time: 11:49:09 (17:30:00 UT) Sun's RA and DEC: 6h 22.1m 23d 20.4 =========================================================== First observations Observation listing from file ./crf107.skd for experiment CRF107 Source Start DURATIONS name yyddd-hhmmss Hh Ho Nt Ft Kg 1741-038 18177-173000| 300 300 300 300| 1424-418 18177-173830| 300 300 300 300 | 1256-220 18177-174528| 300 300 300 | 1145-071 18177-175215| 300 300 300 | 1055+018 18177-175848| 300 300 300 | 1219+044 18177-180541| 300 300 300 | 1013+054 18177-181303| 300 300 300 | 1130+009 18177-181952| 300 300 300 | 1705+018 18177-182920| 300 300 300| 1953-325 18177-183706| 300 300 300| End of listing. =========================================================== Last observations Observation listing from file ./crf107.skd for experiment CRF107 Source Start DURATIONS name yyddd-hhmmss Hh Ho Nt Ft Kg 1557+032 18178-163212| 300 300 300 300| 1741-038 18178-163918| 300 300 300| 1424-418 18178-164733| 300 300 | 1354-152 18178-165446| 300 300 300 | 1705+018 18178-170245| 300 300 300 300| 1219+044 18178-171147| 300 300 300 | 1424-418 18178-171954| 300 300 300 300 | End of listing. =========================================================== SKED Summary from file ./crf107.skd for experiment CRF107 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 11.2 Min = 0.0 Max = 62.6 (Baseline Nt-Kg on 1920-211) RMS = 8.6 Total time: 1435 minutes ( 23.9 hours). Key: Hh=HARTRAO Ho=HOBART26 Nt=NOTO Ft=FORTLEZA Kg=KOGANEI Hh Ho Nt Ft Kg Avg % obs. time: 63 34 51 25 29 41 % cal. time: 2 1 2 1 1 1 % slew time: 31 13 12 7 0 13 % idle time: 3 50 34 67 69 45 total # scans: 182 99 147 71 83 116 # scans/hour : 8 4 6 3 3 5 Avg scan (sec): 300 300 300 300 300 300 # data tracks: 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 Total TB(M5): 6.99 3.80 5.64 2.73 3.19 4.47 # OF OBSERVATIONS BY BASELINE | Hh Ho Nt Ft Kg Total ----------------------------------- Hh| 96 144 71 80 391 Ho| 61 6 73 236 Nt| 71 51 327 Ft| 0 148 Kg| 204 Number of 2-station scans: 17 Number of 3-station scans: 124 Number of 4-station scans: 44 Number of 5-station scans: 0 Total number of scans: 185 Total number of obs: 653 Total integrated obs-time: 195900 Average obs-time: 300.0 Histogram of observation durations Dur: 300 #Obs: | Average X-band SNRs by baseline | Hh Ho Nt Ft Kg AVG ---------------------------------- Hh| 88 108 28 46 76 Ho| 106 27 46 78 Nt| 34 56 84 Ft| - 31 Kg| 49 Average S-band SNRs by baseline | Hh Ho Nt Ft Kg AVG ---------------------------------- Hh| 69 94 28 52 67 Ho| 82 24 45 64 Nt| 34 62 74 Ft| - 31 Kg| 52 =========================================================== Recording mode Name Code AOVSX16N SX Recording mode for: FORTLEZA HARTRAO HOBART26 KOGANEI NOTO Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 1024 Mbits 256 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 16.00 MHz 1 32(*1) 32 X-band spanned bw= 360.0 MHz rms spanned bw= 135.6 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 19.13 11.48 30.61 =========================================================== Tape types ID Station Tape length Density Passes Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kg KOGANEI K5 Nt NOTO Mark5B =========================================================== SNR targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) X-band (ast_margin 0) S-band (ast_margin 0) Hh Ho Nt Ft Hh Ho Nt Ft Ho 14 Ho 12 Nt 14 14 Nt 12 12 Ft 14 14 14 Ft 12 12 12 Kg 14 14 14 14 Kg 12 12 12 12 ===========================================================