Session Notes for rd2003 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 RD2003, we schedule 21 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. Medicina and Noto are tagged along. Wettzell and Kokee will observe INT I20085 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2003 Description R&D-03/2020 Scheduler: NASA Correlator: WASH Start: 2020-085-18:00:00 End: 2020-086-18:00:00 Current yyyyddd: 2020085 (2020.23) ( 18934 MJD, WED. 25MAR.) Greenwich sidereal time: 06:14:37 (18:00:00 UT) Sun's RA and DEC: 0h 20.4m 2d 12.3 =========================================================== First observations Observation listing from file ./rd2003.skd for experiment RD2003 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ny On Wz Nt Mc 0458-020 20085-180000| 40 135 40 170 170 65 69| 0016+731 20085-180416| 236 236 40 40 100 236 160| 1030+415 20085-180651| 40 40 169 169 | 0834-201 20085-181119| 167 40 167 40 98| 1330+476 20085-181244| 136 136 | 1215+303 20085-181517| 253 232 253 600 600| End of listing. =========================================================== Last observations Observation listing from file ./rd2003.skd for experiment RD2003 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ny On Wz Nt Mc 3C446 20086-173714| 40 40 | 0003-066 20086-173934| 50 50 | IIIZW2 20086-174207| 436 436 | 0528-250 20086-174527| 577 295 577 426 577 376| 0823-223 20086-175312| 63 63 63| 0748+126 20086-175701| 169 169 40 40 56 169 169| 1053+704 20086-175858| 52 40 52 52 | End of listing. =========================================================== SKED Summary from file ./rd2003.skd for experiment RD2003 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 5.5 Min = 0.0 Max = 54.3 (Baseline Ft-Kk on 0823-223) RMS = 7.7 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Kk=KOKEE Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Nt=NOTO Mc=MEDICINA Ft Hh Kk Ny On Wz Nt Mc Avg % obs. time: 42 63 42 69 62 71 48 42 55 % cal. time: 2 2 2 2 3 2 2 2 2 % slew time: 26 30 8 10 16 5 21 22 18 % idle time: 29 4 47 18 18 21 28 33 25 total # scans: 186 142 151 177 227 161 136 148 166 # scans/hour : 8 6 6 7 9 7 6 6 7 Avg scan (sec): 193 383 241 338 234 381 305 248 290 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.60 6.97 4.65 7.66 6.80 7.84 5.30 4.70 6.07 # OF OBSERVATIONS BY BASELINE | Ft Hh Kk Ny On Wz Nt Mc Total -------------------------------------------------- Ft| 58 63 32 123 35 75 107 493 Hh| 0 63 34 101 51 37 344 Kk| 69 104 34 47 62 379 Ny| 100 105 49 50 468 On| 79 99 126 665 Wz| 64 49 467 Nt| 82 467 Mc| 513 Number of 2-station scans: 99 Number of 3-station scans: 120 Number of 4-station scans: 90 Number of 5-station scans: 56 Number of 6-station scans: 17 Number of 7-station scans: 4 Number of 8-station scans: 0 Total number of scans: 386 Total number of obs: 1898 Total integrated obs-time: 450335 Average obs-time: 237.3 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: | 562| 193| 104| 109| 84| 47| 30| 48| 62| 64| 26| 29| 61| 45| 47| 20| 86| 60| 221| Average X-band SNRs by baseline | Ft Hh Kk Ny On Wz Nt Mc AVG ------------------------------------------------- Ft| 35 33 32 33 49 40 45 38 Hh| - 44 34 53 42 54 45 Kk| 36 37 56 43 51 41 Ny| 46 68 49 68 51 On| 71 62 75 52 Wz| 96 145 75 Nt| 142 72 Mc| 81 Average S-band SNRs by baseline | Ft Hh Kk Ny On Wz Nt Mc AVG ------------------------------------------------- Ft| 23 34 18 20 29 50 27 28 Hh| - 22 25 27 50 39 30 Kk| 30 37 48 98 50 46 Ny| 23 28 46 32 28 On| 37 68 38 36 Wz| 83 64 42 Nt| 154 81 Mc| 58 =========================================================== 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 MEDICINA NOTO 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 Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 14 Nt NOTO 17640feet (Thin ) 56250 (HIGH ) 14 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 Wz Nt Ft Hh Kk Ny On Wz Nt 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 Nt 20 20 20 20 20 20 Nt 15 15 15 15 15 15 Mc 20 20 20 20 20 20 20 Mc 15 15 15 15 15 15 15 ===========================================================