Session Notes for rd2109 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2109 will observe a total of 59 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 I21326 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2109 Description R&D-11/2021 Scheduler: OSO Correlator: WASH Start: 2021-326-16:30:00 End: 2021-327-16:30:00 Current yyyyddd: 2021326 (2021.89) ( 19541 MJD, MON. 22NOV.) Greenwich sidereal time: 20:37:31 (16:30:00 UT) Sun's RA and DEC: 15h 53.8m -20d 16.3 =========================================================== First observations Observation listing from file ./rd2109.skd for experiment RD2109 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz Is Ny 0149+218 21326-163000| 242 141 242 212 229 242 214| 0014+813 21326-163438| 40 40 58 199 199 42 40| 0812+367 21326-163612| 51 114 114 96| 1040+244 21326-163840| 250 294 294| 2022-077 21326-163944| 215 40 185 215 | 0707+476 21326-164432| 209 165 247 162 239 247 198| 1637+574 21326-164921| 431 40 298 258 261 431 188| 2150+173 21326-165507| 318 390 318 435 435 105| End of listing. =========================================================== Last observations Observation listing from file ./rd2109.skd for experiment RD2109 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz Is Ny 0138-097 21327-161136| 147 83 146 147 | 1637+574 21327-161212| 70 168 168 42| 0426+273 21327-161444| 6 283 253 6 283| 2127-096 21327-161945| 61 61 55 | 1633+38 21327-162126| 97 97 71| 0013-005 21327-162411| 109 45 54 104 109| 2201+315 21327-162651| 179 179 40 179 179| End of listing. =========================================================== SKED Summary from file ./rd2109.skd for experiment RD2109 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.6 Min = 0.0 Max = 144.0 (Baseline Mc-Is on 0414-189) RMS = 7.8 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Is=ISHIOKA Ny=NYALES20 Hh Kk Mc Ns On Wz Is Ny Avg % obs. time: 40 51 57 68 72 71 66 69 62 % cal. time: 2 2 3 2 3 3 3 3 3 % slew time: 32 11 34 2 14 7 4 19 16 % idle time: 25 35 5 27 10 18 27 8 20 total # scans: 166 196 243 208 223 251 223 299 226 # scans/hour : 7 8 10 9 9 10 9 12 9 Avg scan (sec): 209 225 203 283 280 244 254 199 236 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.45 5.64 6.32 7.53 8.00 7.85 7.25 7.63 6.83 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc Ns On Wz Is Ny Total -------------------------------------------------- Hh| 0 158 46 146 157 55 82 644 Kk| 57 137 54 68 149 180 645 Mc| 102 207 228 98 159 1009 Ns| 112 100 142 192 831 On| 202 97 149 967 Wz| 102 171 1028 Is| 196 839 Ny| 1129 Number of 2-station scans: 0 Number of 3-station scans: 92 Number of 4-station scans: 160 Number of 5-station scans: 39 Number of 6-station scans: 58 Number of 7-station scans: 50 Number of 8-station scans: 0 Total number of scans: 399 Total number of obs: 3546 Total integrated obs-time: 795567 Average obs-time: 224.4 Histogram of observation durations Dur: 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 #Obs: | 435| 216| 280| 241| 228| 211| 237| 210| 184| 170| 119| 120| 95| 63| 48| 40| 69| 102| 478| Average X-band SNRs by baseline | Hh Kk Mc Ns On Wz Is Ny AVG ------------------------------------------------- Hh| - 51 46 42 72 49 60 55 Kk| 40 42 42 61 52 61 51 Mc| 59 71 126 47 82 77 Ns| 62 93 47 97 67 On| 112 44 83 72 Wz| 70 123 101 Is| 67 55 Ny| 84 Average S-band SNRs by baseline | Hh Kk Mc Ns On Wz Is Ny AVG ------------------------------------------------- Hh| - 29 19 24 37 32 30 30 Kk| 37 29 38 50 55 48 44 Mc| 17 31 50 27 31 34 Ns| 18 23 21 26 23 On| 44 25 31 31 Wz| 37 43 42 Is| 33 34 Ny| 35 =========================================================== 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 Ns On Wz Is Hh Kk Mc Ns On Wz Is Kk 20 Kk 15 Mc 20 20 Mc 15 15 Ns 20 20 20 Ns 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 Is 20 20 20 20 20 20 Is 15 15 15 15 15 15 Ny 20 20 20 20 20 20 20 Ny 15 15 15 15 15 15 15 ===========================================================