Session Notes for rd2002 PI: Patrick Charlot, Bordeaux Observatory =========================================================== 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 RD2002, we schedule 22 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 command fill is used with an offset of 10 seconds. We use a modified version of the 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I20043 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2002 Description R&D-02/2020 Scheduler: NASA Correlator: WASH Start: 2020-043-18:00:00 End: 2020-044-18:00:00 Current yyyyddd: 2020043 (2020.12) ( 18892 MJD, WED. 12FEB.) Greenwich sidereal time: 03:29:01 (18:00:00 UT) Sun's RA and DEC: 21h 43.2m -13d 41.4 =========================================================== First observations Observation listing from file ./rd2002.skd for experiment RD2002 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ny On Wz 0016+731 20043-180000| 45 106 40 90 106| 0420+022 20043-180306| 91 40 162 154 162| 0109+224 20043-180648| 600 517 600 587 259| 1726+455 20043-181150| 40 40| 1053+704 20043-181319| 101 101| 1330+476 20043-181830| 194 194 | 0522-611 20043-182023| 292 292 | End of listing. =========================================================== Last observations Observation listing from file ./rd2002.skd for experiment RD2002 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ny On Wz 0137+012 20044-173042| 600 600 600| 0241+622 20044-173223| 544 544 | 0528-250 20044-174405| 582 483 582 174| 1330+476 20044-174751| 143 143 126| 1215+303 20044-175055| 152 152 | 0522-611 20044-175457| 293 293 | 1053+704 20044-175507| 41 41 41 40| 1726+455 20044-175658| 43 40 43 40| 1417+385 20044-175847| 63 40 63 | End of listing. =========================================================== SKED Summary from file ./rd2002.skd for experiment RD2002 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 9.2 Min = 0.0 Max = 630.0 (Baseline Ny-Wz on 0410+110) RMS = 36.7 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Kk=KOKEE Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ft Hh Kk Ny On Wz Avg % obs. time: 39 63 46 72 59 72 59 % cal. time: 2 2 2 2 2 2 2 % slew time: 27 28 10 10 15 5 16 % idle time: 31 7 41 14 22 21 23 total # scans: 164 144 188 181 213 163 175 # scans/hour : 7 6 8 8 9 7 7 Avg scan (sec): 207 378 212 345 240 380 293 # data tracks: 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 Total TB(M5): 4.34 6.96 5.11 7.99 6.53 7.93 6.48 # OF OBSERVATIONS BY BASELINE | Ft Hh Kk Ny On Wz Total ---------------------------------------- Ft| 66 67 16 84 35 268 Hh| 0 56 39 99 260 Kk| 84 112 33 296 Ny| 97 101 354 On| 78 410 Wz| 346 Number of 2-station scans: 214 Number of 3-station scans: 133 Number of 4-station scans: 49 Number of 5-station scans: 6 Number of 6-station scans: 0 Total number of scans: 402 Total number of obs: 967 Total integrated obs-time: 264230 Average obs-time: 273.2 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: | 231| 53| 45| 65| 45| 24| 20| 36| 34| 37| 22| 8| 51| 50| 24| 22| 51| 27| 122| Average X-band SNRs by baseline | Ft Hh Kk Ny On Wz AVG --------------------------------------- Ft| 49 34 36 37 69 43 Hh| - 42 47 58 51 Kk| 40 38 56 40 Ny| 52 63 50 On| 94 53 Wz| 68 Average S-band SNRs by baseline | Ft Hh Kk Ny On Wz AVG --------------------------------------- Ft| 28 38 17 24 33 29 Hh| - 20 31 27 26 Kk| 32 37 50 37 Ny| 24 25 25 On| 41 32 Wz| 32 =========================================================== 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 KOKEE NYALES20 ONSALA60 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 Kk KOKEE Mark5B Ny NYALES20 Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14 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 Kk Ny On Ft Hh Kk Ny On Hh 20 Hh 15 Kk 20 20 Kk 15 15 Ny 20 20 20 Ny 15 15 15 On 20 20 20 20 On 15 15 15 15 Wz 20 20 20 20 20 Wz 15 15 15 15 15 ===========================================================