Session Notes for rd1808 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 RD1808, we schedule 28 out of the thirty sources in the astro mode of sked. We use a maxscan value of 600 seconds. We use the sked flux catalog for all sources. The source 3C48 is added to the astro set of sources to monitor the position. In RD1808, we focus on scheduling each source on at least 3 scans. For this reason only 25 of the good geodetic sources are used as base of a stable source set and uniform sky coverage. The command fill is used with an offset of 10 seconds. We use a 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I18283 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1808 Description R&D-10/2018 Scheduler: NASA Correlator: SHAO Start: 2018-283-18:00:00 End: 2018-284-18:00:00 Current yyyyddd: 2018283 (2018.78) ( 18402 MJD, WED. 10OCT.) Greenwich sidereal time: 19:17:09 (18:00:00 UT) Sun's RA and DEC: 13h 4.1m -6d 49.4 =========================================================== First observations Observation listing from file ./rd1808.skd for experiment RD1808 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Ma Ny Wz 2155-304 18283-180000| 377 387 334 120 337 387| 3C371 18283-180408| 91 67 91 | 0133+476 18283-180726| 40 47 40 40 47| 0241+622 18283-180907| 52 126 126| 1144-379 18283-180910| 79 79 | 1215+303 18283-180938| 100 100 | 0716+714 18283-181228| 49 40 49| 1758-651 18283-181247| 170 170 170 | End of listing. =========================================================== Last observations Observation listing from file ./rd1808.skd for experiment RD1808 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Ma Ny Wz 1348+308 18284-174343| 387 379 396 396| 2314-409 18284-174353| 342 342 131 | 3C418 18284-174807| 40 40 | 3C371 18284-175116| 47 58 47 52 58| 0316-444 18284-175135| 361 361 | 1418+546 18284-175306| 89 110 115 110 115| 1144+402 18284-175546| 106 40 40 106| 0241+622 18284-175743| 127 127 | 2355-106 18284-175852| 58 58 58 58| End of listing. =========================================================== SKED Summary from file ./rd1808.skd for experiment RD1808 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.9 Min = 0.0 Max = 57.6 (Baseline Kk-Km on 1349-439) RMS = 8.8 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING Ma=MATERA Ny=NYALES20 Wz=WETTZELL Ft Hh Ho Kk Km Ma Ny Wz Avg % obs. time: 42 48 62 57 60 64 71 70 59 % cal. time: 2 2 2 2 3 2 2 3 2 % slew time: 29 36 29 11 28 19 12 8 22 % idle time: 26 13 6 29 9 13 13 18 16 total # scans: 184 159 177 174 228 203 203 227 194 # scans/hour : 8 7 7 7 10 8 8 9 8 Avg scan (sec): 198 258 302 285 228 273 303 265 263 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.66 5.26 6.85 6.34 6.64 7.09 7.88 7.71 6.55 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Km Ma Ny Wz Total -------------------------------------------------- Ft| 72 61 33 30 91 69 90 446 Hh| 74 0 66 79 39 71 401 Ho| 71 97 22 24 17 366 Kk| 109 46 81 61 401 Km| 76 97 90 565 Ma| 132 176 622 Ny| 159 601 Wz| 664 Number of 2-station scans: 134 Number of 3-station scans: 178 Number of 4-station scans: 90 Number of 5-station scans: 63 Number of 6-station scans: 13 Number of 7-station scans: 0 Number of 8-station scans: 0 Total number of scans: 478 Total number of obs: 2033 Total integrated obs-time: 490878 Average obs-time: 241.5 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 #Obs: | 444| 172| 176| 117| 117| 135| 75| 77| 22| 49| 62| 83| 65| 49| 43| 43| 28| 56| 220| Average X-band SNRs by baseline | Ft Hh Ho Kk Km Ma Ny Wz AVG ------------------------------------------------- Ft| 47 35 34 53 45 50 65 49 Hh| 47 - 46 54 54 82 55 Ho| 26 40 33 32 39 37 Kk| 42 53 54 74 47 Km| 69 76 91 60 Ma| 84 112 76 Ny| 133 84 Wz| 99 Average S-band SNRs by baseline | Ft Hh Ho Kk Km Ma Ny Wz AVG ------------------------------------------------- Ft| 27 19 29 30 21 22 29 25 Hh| 30 - 36 28 30 40 32 Ho| 27 27 18 18 19 25 Kk| 46 39 40 54 40 Km| 34 38 43 37 Ma| 32 42 33 Ny| 49 37 Wz| 42 =========================================================== Recording mode Name Code AOVSX16W 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= 720.0 MHz rms spanned bw= 275.0 MHz S-band spanned bw= 88.0 MHz rms spanned bw= 30.9 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 KOKEE KUNMING MATERA NYALES20 WETTZELL 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= 720.0 MHz rms spanned bw= 275.0 MHz S-band spanned bw= 88.0 MHz rms spanned bw= 30.9 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 Km KUNMING Mark5B Ma MATERA Mark5B Ny NYALES20 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 Kk Km Ma Ny Ft Hh Ho Kk Km Ma Ny Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Km 20 20 20 20 Km 15 15 15 15 Ma 20 20 20 20 20 Ma 15 15 15 15 15 Ny 20 20 20 20 20 20 Ny 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ===========================================================