Session Notes for crf109 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. This session uses ten 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 is different from the previous CRF sessions: the flux values are from the sked flux catalog and the scan length varies from 0 to 420 seconds. The initial source list (43 sources) is the source list of CRF97. 33 sources are defining sources and ten sources are of interest : they had less than ten observations (as found in the most recent S/X catalog) or are K-band and Ka-band sources not in the S/X catalog but potential targets. =========================================================== ----- Parameter listing -------------------------------------- Experiment: CRF109 Description tbd Scheduler: NASA Correlator: SHAO Start: 2018-331-17:30:00 End: 2018-332-17:30:00 Current yyyyddd: 2018331 (2018.91) ( 18450 MJD, TUES 27NOV.) Greenwich sidereal time: 21:56:19 (17:30:00 UT) Sun's RA and DEC: 16h 14.0m -21d 12.2 =========================================================== First observations Observation listing from file ./crf109.skd for experiment CRF109 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kg 0454-234 18331-173000| 20 60 60| 0048-427 18331-173357| 110 80 110 | 2227-088 18331-173800| 10 10 | 1045-188 18331-173852| 50 50| 0017+200 18331-174030| 30 30 | 0808+019 18331-174131| 110 110| End of listing. =========================================================== Observation listing from file ./crf109.skd for experiment CRF109 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kg 2029+121 18332-171546| 40 40 | 0454-234 18332-171616| 10 10| 0607-157 18332-171741| 20 20| 2216-038 18332-171833| 200 200 | 0743-006 18332-171929| 20 20| 0722+145 18332-172105| 150 150| 0017+200 18332-172409| 30 30 | 0605-085 18332-172504| 83 83| 0420-014 18332-172811| 99 99 99| End of listing. =========================================================== SKED Summary from file ./crf109.skd for experiment CRF109 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 17.1 Min = 0.0 Max = 49.7 (Baseline Hh-Kg on 0048-427) RMS = 8.5 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kg=KOGANEI Ft Hh Ho Kg Avg % obs. time: 25 32 43 40 35 % cal. time: 3 4 4 4 3 % slew time: 32 58 42 6 35 % idle time: 39 5 10 50 27 total # scans: 232 306 331 313 295 # scans/hour : 10 13 14 13 12 Avg scan (sec): 92 91 113 109 100 # data tracks: 32 32 32 32 # Mk5 tracks: 32 32 32 32 Total TB(M5): 2.74 3.55 4.78 4.37 3.86 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kg Total ------------------------------ Ft| 221 29 0 250 Hh| 89 82 392 Ho| 299 417 Kg| 381 Number of 2-station scans: 462 Number of 3-station scans: 86 Number of 4-station scans: 0 Total number of scans: 548 Total number of obs: 720 Total integrated obs-time: 74091 Average obs-time: 102.9 Histogram of observation durations Dur: 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 #Obs: | 105| 216| 84| 78| 50| 42| 21| 37| 6| 13| 2| 6| 5| 1| 28| 7| 19| Average X-band SNRs by baseline | Ft Hh Ho Kg AVG ----------------------------- Ft| 32 33 - 32 Hh| 55 32 37 Ho| 35 40 Kg| 35 Average S-band SNRs by baseline | Ft Hh Ho Kg AVG ----------------------------- Ft| 23 23 - 23 Hh| 40 29 28 Ho| 28 30 Kg| 28 =========================================================== Recording mode Name Code AVSX16N1 SX Recording mode for: FORTLEZA Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:2 1024 Mbits 128 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 16.00 MHz 1 16(*2) 32 X-band spanned bw= 360.0 MHz rms spanned bw= 135.6 MHz S-band spanned bw= 188.0 MHz rms spanned bw= 61.7 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 19.13 11.48 30.61 Recording mode for: HARTRAO HOBART26 KOGANEI 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= 188.0 MHz rms spanned bw= 61.7 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 =========================================================== 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) Ft Hh Ho Ft Hh Ho Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kg 20 20 20 Kg 15 15 15 ===========================================================