Session Notes for rd2301 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2301 will observe a total of 56 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. Two sources were scheduled using flux density values from BVID (missing from the sked flux catalog). Wettzell (Wz) and Kokee (Kk) will observe INT I23025 during the time from 1815 UT to 1945 UT. The fill command was used for all stations using a fill offset of 10 seconds. Session Notes for rd2301 =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2301 Description R&D-01/2023 Scheduler: OSO Correlator: WASH Start: 2023-025-18:00:00 End: 2023-026-18:00:00 Current yyyyddd: 2023025 (2023.07) ( 19970 MJD, WED. 25JAN.) Greenwich sidereal time: 02:19:08 (18:00:00 UT) Sun's RA and DEC: 20h 31.4m -18d 53.5 =========================================================== First observations Observation listing from file ./rd2301.skd for experiment RD2301 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz 1739+522 23025-180000| 212 40 212 142 186| 0507+179 23025-180413| 70 92 182 163 182| 0234+285 23025-180801| 40 81 112 89 112| 0306+102 23025-181032| 173 249 332 332 268| 0745+241 23025-181719| 135 218 313 313 | 0237+040 23025-182351| 185 282 385 385 | End of listing. =========================================================== Last observations Observation listing from file ./rd2301.skd for experiment RD2301 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz 0743-006 23026-173625| 40 133 174 174| 0406-127 23026-174024| 480 480 480 480| 0722+145 23026-175126| 90 153 200 188 200| 0506+056 23026-175524| 276 276 276 276 114| 1012+232 23026-175757| 123 123| End of listing. =========================================================== SKED Summary from file ./rd2301.skd for experiment RD2301 (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 = 62.6 (Baseline Kk-Wz on 1236+077) RMS = 5.8 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Hh Kk Mc Ns On Wz Avg % obs. time: 34 35 57 65 74 72 56 % cal. time: 2 1 3 2 3 3 2 % slew time: 27 5 35 1 15 7 15 % idle time: 36 58 4 31 8 17 26 total # scans: 142 107 253 170 225 246 190 # scans/hour : 6 4 11 7 9 10 8 Avg scan (sec): 209 286 196 330 283 253 259 # data tracks: 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 Total TB(M5): 3.80 3.92 6.36 7.19 8.14 7.96 6.23 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc Ns On Wz Total ---------------------------------------- Hh| 0 136 68 128 131 463 Kk| 100 88 83 107 378 Mc| 164 221 233 854 Ns| 164 155 639 On| 205 801 Wz| 831 Number of 2-station scans: 9 Number of 3-station scans: 44 Number of 4-station scans: 72 Number of 5-station scans: 141 Number of 6-station scans: 0 Total number of scans: 266 Total number of obs: 1983 Total integrated obs-time: 464860 Average obs-time: 234.4 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: | 203| 118| 161| 128| 109| 101| 136| 122| 123| 110| 65| 79| 44| 43| 33| 33| 26| 28| 321| Average X-band SNRs by baseline | Hh Kk Mc Ns On Wz AVG --------------------------------------- Hh| - 54 45 45 80 57 Kk| 44 51 50 79 57 Mc| 59 74 125 78 Ns| 64 97 67 On| 122 77 Wz| 106 Average S-band SNRs by baseline | Hh Kk Mc Ns On Wz AVG --------------------------------------- Hh| - 29 18 26 41 30 Kk| 39 31 43 63 45 Mc| 17 32 49 34 Ns| 19 27 22 On| 47 33 Wz| 45 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO KOKEE MEDICINA 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 Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 1 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 Hh Kk Mc Ns On 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 ===========================================================