Session Notes for rd1710 Prepared by K. Le Bail, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted in 2012 a proposal to observe 195 ICRF2 transfer sources in the context of the GAIA mission. These sources were added to the GSFC monitoring program and 37 sources were scheduled in Gaia-dedicated R&D sessions. In February 2017, we studied the position uncertainties and the observation frequency of the 195 sources of the LAB proposal. Twenty-seven of these sources have a bad observation frequency: they were observed successfully in less than five sessions a year while the LAB requirement was twelve sessions a year. Most of these sources have bad uncertainties compared to the other sources of the set (larger than 50 microas). Three additional sources have good position uncertainties and an observation frequency of five to eleven successful sessions a year. However they are sources that were observed in previous Gaia-dedicated R&D sessions and the concern is that if they are not scheduled in coming dedicated R&D sessions, their observation frequency may drop. The sources scheduled in the Gaia-dedicated R&D sessions scheduled to observe after March 1st, 2017 are these thirty sources. When compared to the previous categories determined by the LAB, one source was in category 1, five sources were in category 2, five sources were in category 3 and nineteen sources were in category 4. In RD1710, we could schedule only twenty sources in the astro mode of sked. We used a maxscan value of 800 seconds. Forty of the good geodetic sources are used as base of a stable source set and uniform sky coverage. We use the sked flux catalog for all sources. Wettzell will observe INT I17277 during the time from 1815 UT to 1945 UT. The command FILL was used on all stations (except Ny and Wz) and on the entire period with a fill_off (buffer offset) of 5 seconds. The command was not used on Ny and Wz because of the media capacity. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1710 Description R&D-10/2017 Scheduler: NASA Correlator: HAYS Start: 2017-277-18:00:00 End: 2017-278-18:00:00 Current yyyyddd: 2017277 (2017.76) ( 18031 MJD, WED. 4OCT.) Greenwich sidereal time: 18:54:27 (18:00:00 UT) Sun's RA and DEC: 12h 43.0m -4d 37.6 =========================================================== First observations Observation listing from file ./rd1710.skd for experiment RD1710 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Ma Ny On Wz 1909+161 17277-180000| 800 800 800 800 800 415| 0340+362 17277-181543| 415 335 200 415 | 1639-062 17277-181556| 57 57 | 0017+200 17277-182237| 91 91 40 | 0241+622 17277-182407| 290 290 | 2155-304 17277-182731| 671 586 595 671 | End of listing. =========================================================== Last observations Observation listing from file ./rd1710.skd for experiment RD1710 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Ma Ny On Wz 1758-651 17278-171628| 286 286 | 1215+303 17278-171953| 339 339| 2155-304 17278-172325| 190 190 190 | 0133+476 17278-172821| 49 40 49 40| 2329-415 17278-172834| 177 177 | 0529+483 17278-173003| 49 49 47| 1330+476 17278-173206| 745 745 577| 0017+200 17278-173519| 40 40 40 | 2355-106 17278-173827| 40 40 | 0048-427 17278-174135| 105 105 | 0312+100 17278-174603| 747 747 | 2029+024 17278-174722| 753 753 568| End of listing. =========================================================== SKED Summary from file ./rd1710.skd for experiment RD1710 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 3.8 Min = 0.0 Max = 49.7 (Baseline Ho-Wz on 0823-223) RMS = 7.5 Total time: 1437 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Ma=MATERA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ft Hh Ho Ma Ny On Wz Avg % obs. time: 41 61 55 71 67 42 62 57 % cal. time: 1 2 2 2 2 2 2 2 % slew time: 16 33 28 17 9 9 6 17 % idle time: 40 2 14 10 21 46 29 24 total # scans: 117 153 170 166 163 143 159 153 # scans/hour : 5 6 7 7 7 6 7 6 Avg scan (sec): 302 346 280 368 353 251 337 319 # data tracks: 32 32 32 32 32 16 32 # Mk5 tracks: 32 32 32 32 32 16 32 Total TB(M5): 2.3 3.4 3.0 3.9 3.7 1.1 3.4 3.0 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Ma Ny On Wz Total --------------------------------------------- Ft| 37 40 43 14 56 21 211 Hh| 87 63 26 21 51 285 Ho| 34 47 11 26 245 Ma| 67 76 88 371 Ny| 60 100 314 On| 53 277 Wz| 339 Number of 2-station scans: 220 Number of 3-station scans: 116 Number of 4-station scans: 58 Number of 5-station scans: 9 Number of 6-station scans: 1 Number of 7-station scans: 0 Total number of scans: 404 Total number of obs: 1021 Total integrated obs-time: 314912 Average obs-time: 308.4 Histogram of observation durations Dur: 40 80 120 160 200 240 280 320 360 400 440 480 520 560 600 640 680 720 760 800 #Obs: | 322| 64| 40| 60| 51| 25| 53| 32| 9| 26| 38| 16| 43| 40| 25| 49| 20| 25| 83| Average X-band SNRs by baseline | Ft Hh Ho Ma Ny On Wz AVG -------------------------------------------- Ft| 31 25 47 35 49 34 38 Hh| 33 33 28 36 32 32 Ho| 26 39 36 29 32 Ma| 69 80 63 57 Ny| 69 74 61 On| 62 63 Wz| 57 Average S-band SNRs by baseline | Ft Hh Ho Ma Ny On Wz AVG -------------------------------------------- Ft| 29 25 23 17 23 18 23 Hh| 36 26 21 31 24 29 Ho| 25 27 22 25 29 Ma| 23 26 23 24 Ny| 19 24 23 On| 19 23 Wz| 23 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: FORTLEZA HARTRAO HOBART26 MATERA NYALES20 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 Recording mode for: ONSALA60 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= 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 10.00 6.00 16.00 =========================================================== Tape types ID Station Tape length Density Passes Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Ho HOBART26 Mark5A Ma MATERA Mark5B Ny NYALES20 Mark5B On ONSALA60 Mark5B Wz WETTZELL 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) Ft Hh Ho Ma Ny On Ft Hh Ho Ma Ny On Hh 20 Hh 15 Ho 20 20 Ho 15 15 Ma 20 20 20 Ma 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 ===========================================================