Session Notes for rd2108 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2108 will observe a total of 55 optically-bright ICRF3 sources selected from the Gaia Data Release 2 catalog with the following criteria: (i) relatively compact VLBI structure (structure index < 3), (ii) stronger than 0.25 Jy at X and S band, (iii) not observed in any of the IVS sessions during the past 30 days (excluding the intensive sessions), (iv) observed at least 6 times since August 2014 (beginning of the Gaia operations) and with no gap longer than two years. The optical magnitude of the sources ranges from 16.0 to 20.0. The goal is to improve the overall temporal coverage of the observations by IVS of those optically-bright ICRF3 sources during the Gaia operations. The command fill is used with an offset of 10 seconds. Wettzell and Kokee will observe INT I21279 during the time from 1815 UT to 1945 UT. Nyale13s (Ns), Ny-Alesund (Ny), and Ishioka (Is) are tagged along. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2108 Description R&D-10/2021 Scheduler: OSO Correlator: WASH Start: 2021-279-18:00:00 End: 2021-280-18:00:00 Current yyyyddd: 2021279 (2021.76) ( 19494 MJD, WED. 6OCT.) Greenwich sidereal time: 19:02:28 (18:00:00 UT) Sun's RA and DEC: 12h 50.4m -5d 24.4 =========================================================== First observations Observation listing from file ./rd2108.skd for experiment RD2108 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc On Wz Is Ns Ny 0014+813 21279-180000| 422 40 76 117 115 422| 0106+013 21279-180253| 40 92 110 130 130 | 2325-150 21279-180539| 43 68 94 94 | 2145+067 21279-180827| 40 77 99 118 118| 2022-077 21279-181101| 40 80 167 167 | End of listing. =========================================================== Last observations Observation listing from file ./rd2108.skd for experiment RD2108 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc On Wz Is Ns Ny 1342+663 21280-170834| 80 41 67 89 89 88| 1145+268 21280-171057| 362 156 189 362 344| 2029+024 21280-171820| 393 478 467 527 527| IIIZW2 21280-172809| 163 127 127 163 152 146| 0234+285 21280-173130| 590 40 40 106 590 590 82| 2142+110 21280-173404| 250 296 296 308 308| 2250+194 21280-173957| 600 600 600 600 600| 2155-304 21280-175313| 106 177 177 | IIIZW2 21280-175752| 118 118 118 118 118 118| End of listing. =========================================================== SKED Summary from file ./rd2108.skd for experiment RD2108 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 5.7 Min = 0.0 Max = 45.0 (Baseline Wz-Is on 2022-077) RMS = 6.5 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA On=ONSALA60 Wz=WETTZELL Is=ISHIOKA Ns=NYALE13S Ny=NYALES20 Hh Kk Mc On Wz Is Ns Ny Avg % obs. time: 43 31 56 72 72 21 4 60 45 % cal. time: 2 1 3 3 3 1 0 2 2 % slew time: 35 4 37 14 7 1 0 9 14 % idle time: 19 64 4 10 17 77 95 28 40 total # scans: 187 77 274 245 258 52 8 173 159 # scans/hour : 8 3 11 10 11 2 0 7 7 Avg scan (sec): 198 343 175 255 242 348 429 298 285 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.74 3.38 6.14 8.00 8.00 2.31 0.44 6.60 4.95 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc On Wz Is Ns Ny Total -------------------------------------------------- Hh| 0 186 170 177 15 2 103 653 Kk| 75 66 77 35 3 62 318 Mc| 244 255 52 8 172 992 On| 230 47 7 166 930 Wz| 51 5 160 955 Is| 3 45 248 Ns| 8 36 Ny| 716 Number of 2-station scans: 10 Number of 3-station scans: 21 Number of 4-station scans: 84 Number of 5-station scans: 119 Number of 6-station scans: 41 Number of 7-station scans: 2 Number of 8-station scans: 0 Total number of scans: 277 Total number of obs: 2424 Total integrated obs-time: 480310 Average obs-time: 198.1 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: | 524| 235| 337| 245| 188| 110| 138| 82| 72| 42| 37| 31| 27| 38| 34| 9| 22| 39| 214| Average X-band SNRs by baseline | Hh Kk Mc On Wz Is Ns Ny AVG ------------------------------------------------- Hh| - 53 43 76 43 85 54 57 Kk| 29 33 60 73 109 68 51 Mc| 71 121 40 39 83 78 On| 119 45 55 87 77 Wz| 79 97 143 109 Is| 99 90 64 Ns| 97 76 Ny| 93 Average S-band SNRs by baseline | Hh Kk Mc On Wz Is Ns Ny AVG ------------------------------------------------- Hh| - 26 21 34 31 63 26 27 Kk| 32 36 59 102 126 70 55 Mc| 31 48 28 28 34 35 On| 46 32 52 37 35 Wz| 52 59 54 47 Is| 76 58 50 Ns| 125 73 Ny| 44 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO ISHIOKA KOKEE MEDICINA NYALES20 NYALE13S ONSALA60 WETTZELL Mode Tot.Rate #Chan Chan.BW Tot.BW #BBC #bits Tracks*(fan) Tot.tracks Barrel Mk341:1 1024 Mbps 16 16 Mhz 256 Mhz 14 2 32*(1) 32 NONE 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 Speed Hh HARTRAO Mark5B Is ISHIOKA K5 Kk KOKEE Mark5B Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 1 Ny NYALES20 Mark5B Ns NYALE13S 17650feet (Thin ) 33333 (Low ) 1 On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 1 Wz WETTZELL 17640feet (Thin ) 56250 (HIGH ) 1 =========================================================== 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 Kk Mc On Wz Is Ns Hh Kk Mc On Wz Is Ns Kk 20 Kk 15 Mc 20 20 Mc 15 15 On 20 20 20 On 15 15 15 Wz 20 20 20 20 Wz 15 15 15 15 Is 20 20 20 20 20 Is 15 15 15 15 15 Ns 20 20 20 20 20 20 Ns 15 15 15 15 15 15 Ny 20 20 20 20 20 20 20 Ny 15 15 15 15 15 15 15 ===========================================================