Session Notes for rd2104 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2104 will observe a total of 51 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 I21125 during the time from 1815 UT to 1945 UT. Nyale13s (Ns) is tagged along. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2104 Description R&D-05/2021 Scheduler: OSO Correlator: SHAO Start: 2021-125-18:00:00 End: 2021-126-18:00:00 Current yyyyddd: 2021125 (2021.34) ( 19340 MJD, WED. 5MAY.) Greenwich sidereal time: 08:55:18 (18:00:00 UT) Sun's RA and DEC: 2h 52.0m 16d 28.1 =========================================================== First observations Observation listing from file ./rd2104.skd for experiment RD2104 Source Start DURATIONS name yyddd-hhmmss Hh Kk Km Mc Ny On Wz Ns 1637+574 21125-180000| 117 51 40 92 91 117 40| 1147+245 21125-180247| 47 146 89 190 183 190 42| 0754+100 21125-180703| 40 110 197 176 197 55| 1145-071 21125-181107| 55 114 111 120 120 | End of listing. =========================================================== Last observations Observation listing from file ./rd2104.skd for experiment RD2104 Source Start DURATIONS name yyddd-hhmmss Hh Kk Km Mc Ny On Wz Ns 1717+178 21126-173104| 211 103 211 | 0919-260 21126-173159| 54 118 163 163 | 1219+044 21126-173546| 480 480 480 480 480 480 | 1432+200 21126-174609| 480 239 480 357 480 366 448| 1738+499 21126-175256| 69 51 75 75 | 1657+265 21126-175456| 77 77 77 | 1256-220 21126-175704| 166 166 166 166 | 0656+082 21126-175752| 118 118 40| End of listing. =========================================================== SKED Summary from file ./rd2104.skd for experiment RD2104 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 8.9 Min = 0.0 Max = 49.7 (Baseline Kk-Wz on 0656+082) RMS = 6.6 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Km=KUNMING Mc=MEDICINA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ns=NYALE13S Hh Kk Km Mc Ny On Wz Ns Avg % obs. time: 36 38 47 53 69 71 69 27 51 % cal. time: 2 2 3 3 3 3 3 2 3 % slew time: 33 8 33 38 15 15 8 1 19 % idle time: 28 52 16 5 12 10 18 69 27 total # scans: 166 138 260 261 264 237 270 167 220 # scans/hour : 7 6 11 11 11 10 11 7 9 Avg scan (sec): 185 237 156 176 226 259 222 141 199 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 3.94 4.18 5.20 5.87 7.63 7.85 7.67 3.01 5.67 # OF OBSERVATIONS BY BASELINE | Hh Kk Km Mc Ny On Wz Ns Total -------------------------------------------------- Hh| 0 107 135 92 112 139 56 641 Kk| 99 64 99 73 73 72 480 Km| 170 188 153 175 112 1004 Mc| 190 202 243 129 1133 Ny| 206 196 160 1131 On| 197 137 1080 Wz| 131 1154 Ns| 797 Number of 2-station scans: 45 Number of 3-station scans: 58 Number of 4-station scans: 77 Number of 5-station scans: 62 Number of 6-station scans: 78 Number of 7-station scans: 59 Number of 8-station scans: 0 Total number of scans: 379 Total number of obs: 3710 Total integrated obs-time: 652266 Average obs-time: 175.8 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: | 754| 329| 280| 369| 307| 275| 211| 137| 100| 121| 70| 139| 89| 103| 78| 28| 52| 20| 248| Average X-band SNRs by baseline | Hh Kk Km Mc Ny On Wz Ns AVG ------------------------------------------------- Hh| - 59 46 46 36 64 34 49 Kk| 65 42 43 29 65 28 46 Km| 71 72 50 100 49 69 Mc| 72 64 117 52 73 Ny| 73 112 73 75 On| 98 44 62 Wz| 67 95 Ns| 53 Average S-band SNRs by baseline | Hh Kk Km Mc Ny On Wz Ns AVG ------------------------------------------------- Hh| - 44 25 23 19 32 20 28 Kk| 72 43 49 42 59 38 52 Km| 42 46 36 57 37 47 Mc| 30 28 44 25 34 Ny| 31 43 30 36 On| 39 22 31 Wz| 30 43 Ns| 29 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO KOKEE KUNMING 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 Kk KOKEE Mark5B Km KUNMING 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 Km Mc Ny On Wz Hh Kk Km Mc Ny On Wz Kk 20 Kk 15 Km 20 20 Km 15 15 Mc 20 20 20 Mc 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 On 20 20 20 20 20 On 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 Ns 20 20 20 20 20 20 20 Ns 15 15 15 15 15 15 15 ===========================================================