Session Notes for rd1810 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 RD1810, we schedule 19 out of the thirty sources in the astro mode of sked. We used a maxscan value of 720 seconds. Seventeen 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. We use a 512Mbps mode to accomodate mixed mode testing of stations K2, Gs and Wf. The station Ny-Alesund was set with a 12 degree lower elevation limit due to a rocket launch event. Kokee will observe INT I18346 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1810 Description R&D-12/2018 Scheduler: NASA Correlator: HAYS Start: 2018-346-18:00:00 End: 2018-347-18:00:00 Current yyyyddd: 2018346 (2018.95) ( 18465 MJD, WED. 12DEC.) Greenwich sidereal time: 23:25:32 (18:00:00 UT) Sun's RA and DEC: 17h 19.3m -23d 6.4 =========================================================== First observations Observation listing from file ./rd1810.skd for experiment RD1810 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Mc Ny On Gs Wf K2 0537-441 18346-180000| 137 137 | 1803+784 18346-180000| 40 77 40 74 40 40 77| 1144+402 18346-180259| 40 40 72 51 72 56| 1741-038 18346-180519| 40 40 40| 0202+319 18346-180645| 49 44 45 72 72 | 0823-223 18346-180742| 40 40 | 0241+622 18346-180934| 569 564 720 674 720 | 0528-250 18346-181110| 258 258 | End of listing. =========================================================== Last observations Observation listing from file ./rd1810.skd for experiment RD1810 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Mc Ny On Gs Wf K2 0410+110 18347-172510| 528 666 645 666 | 1349-439 18347-172944| 720 703 720| 2029+024 18347-173220| 262 262 | 2155-304 18347-173857| 184 184 | 3C418 18347-174129| 40 40 40 40 | 1251-197 18347-174336| 516 516 | 2145+082 18347-174447| 615 615 561 | 1418+546 18347-175409| 108 86 76 108| 0823-223 18347-175440| 40 40 | 0716+714 18347-175837| 40 45 41 71 52 71 | End of listing. =========================================================== SKED Summary from file ./rd1810.skd for experiment RD1810 (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 = 62.6 (Baseline Ho-On on 2355-106) RMS = 6.6 Total time: 1439 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Mc=MEDICINA Ny=NYALES20 On=ONSALA60 Gs=GGAO12M Wf=WESTFORD K2=KOKEE12M Hh Ho Kk Mc Ny On Gs Wf K2 Avg % obs. time: 44 47 38 55 53 39 43 39 43 45 % cal. time: 1 1 2 2 2 2 1 1 1 1 % slew time: 24 18 9 25 10 12 3 5 0 12 % idle time: 29 32 51 16 35 46 52 54 54 42 total # scans: 106 115 137 166 158 164 99 104 96 127 # scans/hour : 4 5 6 7 7 7 4 4 4 5 Avg scan (sec): 360 353 237 288 287 207 376 322 388 312 # data tracks: 32 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 32 Total TB(M5): 2.4 2.6 2.1 3.1 2.9 2.2 38.1 34.3 38.1 14.0 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Mc Ny On Gs Wf K2 Total ------------------------------------------------------- Hh| 32 0 76 35 39 14 9 0 205 Ho| 77 10 10 5 0 4 32 170 Kk| 28 49 47 15 21 48 285 Mc| 102 112 33 29 13 403 Ny| 112 35 32 14 389 On| 36 33 20 404 Gs| 84 44 261 Wf| 49 261 K2| 220 Number of 2-station scans: 171 Number of 3-station scans: 148 Number of 4-station scans: 41 Number of 5-station scans: 24 Number of 6-station scans: 9 Number of 7-station scans: 3 Number of 8-station scans: 0 Number of 9-station scans: 0 Total number of scans: 396 Total number of obs: 1299 Total integrated obs-time: 356544 Average obs-time: 274.5 Histogram of observation durations Dur: 35 70 105 140 175 210 245 280 315 350 385 420 455 490 525 560 595 630 665 700 735 #Obs: | 601| 57| 29| 13| 20| 13| 42| 18| 32| 12| 16| 8| 33| 33| 66| 52| 26| 58| 61| 109| Average X-band SNRs by baseline | Hh Ho Kk Mc Ny On Gs Wf K2 AVG ------------------------------------------------------ Hh| 25 - 37 38 35 28 35 - 34 Ho| 26 32 38 26 - 30 27 27 Kk| 64 64 45 39 38 34 42 Mc| 70 64 46 56 54 57 Ny| 65 48 57 51 60 On| 38 51 47 55 Gs| 51 41 45 Wf| 40 49 K2| 39 Average S-band SNRs by baseline | Hh Ho Kk Mc Ny On Gs Wf K2 AVG ------------------------------------------------------ Hh| 31 - 25 24 21 19 18 - 24 Ho| 31 17 18 15 - 20 20 26 Kk| 36 37 29 30 24 34 32 Mc| 26 24 21 20 22 25 Ny| 23 20 20 18 25 On| 18 18 19 22 Gs| 35 33 28 Wf| 29 27 K2| 28 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: GGAO12M HARTRAO HOBART26 KOKEE KOKEE12M MEDICINA NYALES20 ONSALA60 WESTFORD 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 Gs GGAO12M 17640feet (Thin ) 56250 (HIGH ) 14 Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kk KOKEE Mark5B K2 KOKEE12M Mark5B Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 14 Ny NYALES20 Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14 Wf WESTFORD 17640feet (Thin ) 56250 (HIGH ) 14 =========================================================== 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 Kk Mc Ny On Gs Wf Hh Ho Kk Mc Ny On Gs Wf Ho 20 Ho 15 Kk 20 20 Kk 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 Gs 20 20 20 20 20 20 Gs 15 15 15 15 15 15 Wf 20 20 20 20 20 20 20 Wf 15 15 15 15 15 15 15 K2 20 20 20 20 20 20 20 20 K2 15 15 15 15 15 15 15 15 ===========================================================