Session Notes for rd1508 Prepared by K. Le Bail and J. Gipson, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal - Observation of : - 1 source in category 1 and 2 sources in category 2 with bad position uncertainties, - 1 source in category 1 and 4 sources in category 2 that were poorly observed in the past 24 months, - 1 source in category 3 that was not observed in the past 12 months, - 24 sources in category 4. The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted a proposal to observe 195 ICRF2 transfer sources in the context of the GAIA mission. Those 195 sources are divided in four categories. The forth category contains 24 sources which are not part of the IVS monitoring program and which have a poor position accuracy. The goal in observing them in R&D sessions is to improve their position accuracy. We noticed one source in category 1 and two sources in category 2 have position uncertainties between 100 and 200 microas. They will be observed in this session to improve their uncertainties. Also, five sources in categories 1 and 2 have been poorly observed in the past 24 months, and one source in category 3 was not observed at all in the past 12 months. This is probably due to the fact these sources are weak or they are in the Southern hemisphere. They will be observed in this session. In RD1508, we were able to schedule these 33 sources of the GAIA proposal in the astro mode of sked. Forty of the good geodetic sources are used as base of a stable sources set and uniform sky coverage. We use the sked flux catalog except for three sources. Wettzell and Kokee will observe INT I15280 during the time from 1815 UT to 1945 UT. ----- Parameter listing -------------------------------------- Experiment: RD1508 Description R&D-10/2015 Scheduler: NASA Correlator: HAYS Start: 2015-280-18:00:00 End: 2015-281-18:00:00 Current yyyyddd: 2015280 (2015.77) ( 17303 MJD, WED. 7OCT.) Greenwich sidereal time: 19:04:15 (18:00:00 UT) Sun's RA and DEC: 12h 52.1m -5d 34.8 =========================================================== First observations Observation listing from file ./rd1508.skd for experiment RD1508 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Mc Ny T6 Wz 1803+784 15280-180000| 40 40 40 40 40 40| 2353-686 15280-180000| 40 40 | 1144-379 15280-180416| 69 58 69 | 0823-223 15280-180756| 93 93 | 2239+096 15280-181009| 108 129 129 40 97| 0627-199 15280-181101| 40 40 | End of listing. =========================================================== Last observations Observation listing from file ./rd1508.skd for experiment RD1508 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Mc Ny T6 Wz 1144-379 15280-180416| 69 58 69 | 0823-223 15280-180756| 93 93 | 2239+096 15280-181009| 108 129 129 40 97| 0627-199 15280-181101| 40 40 | 1144+402 15280-181336| 40 40 40| 0325+395 15280-181459| 382 382 43 | 2314-409 15280-181515| 182 182 | 0104-408 15280-182118| 45 45 40 | 0241+622 15280-182217| 454 454 | End of listing. =========================================================== SKED Summary from file ./rd1508.skd for experiment RD1508 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 3.4 Min = 0.0 Max = 47.2 (Baseline Mc-T6 on 0823-223) RMS = 6.2 Total time: 1438 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Mc=MEDICINA Ny=NYALES20 T6=TIANMA65 Wz=WETTZELL Ft Hh Ho Kk Mc Ny T6 Wz Avg % obs. time: 16 38 58 53 54 61 31 50 45 % cal. time: 1 2 2 2 2 2 3 2 2 % slew time: 17 32 23 10 25 12 49 7 22 % idle time: 65 27 16 34 17 24 17 40 30 total # scans: 110 146 152 146 196 194 218 195 169 # scans/hour : 5 6 6 6 8 8 9 8 7 Avg scan (sec): 122 226 331 311 240 271 123 220 229 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 0.9 2.1 3.2 2.9 3.0 3.4 1.7 2.7 2.5 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Mc Ny T6 Wz Total -------------------------------------------------- Ft| 62 26 10 55 22 5 45 225 Hh| 43 0 68 38 45 58 314 Ho| 74 7 18 104 9 281 Kk| 37 54 103 36 314 Mc| 125 58 161 511 Ny| 82 144 483 T6| 56 453 Wz| 509 Number of 2-station scans: 166 Number of 3-station scans: 175 Number of 4-station scans: 79 Number of 5-station scans: 32 Number of 6-station scans: 4 Number of 7-station scans: 0 Number of 8-station scans: 0 Total number of scans: 456 Total number of obs: 1545 Total integrated obs-time: 301899 Average obs-time: 195.4 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540#Obs: | 619| 145| 56| 64| 32| 44| 15| 70| 46| 47| 57| 37| 43| 52| 31| 29| 158Average X-band SNRs by baseline | Ft Hh Ho Kk Mc Ny T6 Wz AVG ------------------------------------------------- Ft| 43 24 34 59 50 166 66 52 Hh| 32 - 57 33 83 56 51 Ho| 19 24 27 60 29 38 Kk| 34 39 66 49 44 Mc| 60 129 91 75 Ny| 98 64 62 T6| 197 97 Wz| 85 Average S-band SNRs by baseline | Ft Hh Ho Kk Mc Ny T6 Wz AVG ------------------------------------------------- Ft| 27 21 29 28 25 68 28 27 Hh| 28 - 34 19 58 29 32 Ho| 23 17 17 41 19 30 Kk| 26 29 51 34 35 Mc| 25 60 34 33 Ny| 39 25 27 T6| 79 52 Wz| 35 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: FORTLEZA HARTRAO HOBART26 KOKEE MEDICINA NYALES20 TIANMA65 WETTZELL Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 512 Mbits 128 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 8.00 MHz 1 32(*1) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 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 Kk KOKEE Mark5B Mc MEDICINA Mark5B Ny NYALES20 Mark5B T6 TIANMA65 Mark5B Wz WETTZELL Mark5A =========================================================== 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 Kk Mc Ny T6 Ft Hh Ho Kk Mc Ny T6 Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Mc 20 20 20 20 Mc 15 15 15 15 Ny 20 20 20 20 20 Ny 15 15 15 15 15 T6 30 30 30 30 30 30 T6 20 20 20 20 20 20 Wz 20 20 20 20 20 20 30 Wz 15 15 15 15 15 15 20 ===========================================================