Session Notes for rd1703 Prepared by K. Le Bail, 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. In RD1703, we were able to schedule 30 sources in the astro mode of sked. We used a maxscan value of 620 seconds. 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 for all sources. ----- Parameter listing -------------------------------------- Experiment: RD1703 Description R&D-11/2016 Scheduler: NASA Correlator: SHAO Start: 2017-051-16:30:00 End: 2017-052-16:30:00 Current yyyyddd: 2017051 (2017.14) ( 17805 MJD, MON. 20FEB.) Greenwich sidereal time: 02:33:11 (16:30:00 UT) Sun's RA and DEC: 22h 16.9m -10d 40.7 =========================================================== First observations Observation listing from file ./rd1703.skd for experiment RD1703 Source Start DURATIONS name yyddd-hhmmss Hh Ho Km Mc Ny On Wz 0420+022 17051-163000| 66 40 40 40 66 40| 0700-197 17051-163346| 40 40 40 40 40| 1144+402 17051-163730| 40 40 40 40 40| 1418+546 17051-163921| 40 40 40 40 40| 0241+622 17051-164245| 40 87 87 87 66| 1022+194 17051-164631| 150 90 158 158 125| End of listing. =========================================================== Last observations Observation listing from file ./rd1703.skd for experiment RD1703 Source Start DURATIONS name yyddd-hhmmss Hh Ho Km Mc Ny On Wz 0241+622 17052-162348| 40 87 87 87 66| 0522-611 17052-162509| 149 149 | 1803+784 17052-162653| 40 40 40 40 40| 3C418 17052-162833| 40 40 40 40| 0454-463 17052-162920| 40 40 | End of listing. =========================================================== SKED Summary from file ./rd1703.skd for experiment RD1703 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 4.1 Min = 0.0 Max = 110.8 (Baseline Ho-On on 1936-155) RMS = 7.2 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Km=KUNMING Mc=MEDICINA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Hh Ho Km Mc Ny On Wz Avg % obs. time: 49 36 56 58 64 42 55 51 % cal. time: 1 1 2 2 2 2 2 2 % slew time: 27 16 22 27 11 14 7 18 % idle time: 22 46 19 12 21 41 34 28 total # scans: 125 106 170 201 191 183 205 168 # scans/hour : 5 4 7 8 8 8 9 7 Avg scan (sec): 340 290 285 248 292 196 233 268 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 2.7 2.0 3.1 3.2 3.6 2.3 3.1 2.8 # OF OBSERVATIONS BY BASELINE | Hh Ho Km Mc Ny On Wz Total --------------------------------------------- Hh| 59 80 61 34 35 58 327 Ho| 81 10 25 9 13 197 Km| 65 79 51 81 437 Mc| 143 146 153 578 Ny| 128 143 552 On| 141 510 Wz| 589 Number of 2-station scans: 86 Number of 3-station scans: 143 Number of 4-station scans: 69 Number of 5-station scans: 39 Number of 6-station scans: 17 Number of 7-station scans: 1 Total number of scans: 355 Total number of obs: 1595 Total integrated obs-time: 382761 Average obs-time: 240.0 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 630#Obs: | 420| 175| 112| 57| 64| 64| 40| 60| 54| 86| 20| 49| 33| 34| 25| 27| 24| 17| 73| 161Average X-band SNRs by baseline | Hh Ho Km Mc Ny On Wz AVG -------------------------------------------- Hh| 31 34 36 31 31 42 35 Ho| 36 31 27 27 34 33 Km| 34 36 30 42 36 Mc| 49 45 67 49 Ny| 43 57 46 On| 54 44 Wz| 55 Average S-band SNRs by baseline | Hh Ho Km Mc Ny On Wz AVG -------------------------------------------- Hh| 29 26 20 20 18 22 23 Ho| 34 24 21 16 25 29 Km| 25 25 22 27 27 Mc| 21 19 25 22 Ny| 18 23 22 On| 21 19 Wz| 24 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: HARTRAO HOBART26 KUNMING MEDICINA NYALES20 ONSALA60 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 =========================================================== 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 Km Mc Ny On Hh Ho Km Mc Ny On Ho 20 Ho 15 Km 20 20 Km 15 15 Mc 20 20 20 Mc 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 On 20 20 20 20 20 On 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 ===========================================================