Session Notes for rd2102 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2102 will observe a total of 50 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 I21041 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2102 Description R&D-02/2021 Scheduler: OSO Correlator: SHAO Start: 2021-041-18:00:00 End: 2021-042-18:00:00 Current yyyyddd: 2021041 (2021.11) ( 19256 MJD, WED. 10FEB.) Greenwich sidereal time: 03:24:08 (18:00:00 UT) Sun's RA and DEC: 21h 38.3m -14d 6.1 =========================================================== First observations Observation listing from file ./rd2102.skd for experiment RD2102 Source Start DURATIONS name yyddd-hhmmss Hh Kk Ma On Wz 1221+809 21041-180000| 79 40 53 79| 0814+425 21041-180203| 40 75 97 97| 0745+241 21041-180434| 40 95 103 103| 0743-006 21041-180722| 40 118 125 125| End of listing. =========================================================== Last observations Observation listing from file ./rd2102.skd for experiment RD2102 Source Start DURATIONS name yyddd-hhmmss Hh Kk Ma On Wz 0528+134 21042-173649| 480 207 480 277| 0014+813 21042-174233| 131 107 131| 1101+384 21042-174556| 221 190 199 221| 0834+250 21042-175014| 109 40 70 109| 2209+236 21042-175312| 283 398 289 398| 1758+388 21042-175856| 54 54 | End of listing. =========================================================== SKED Summary from file ./rd2102.skd for experiment RD2102 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 10.9 Min = 0.0 Max = 51.4 (Baseline Hh-Wz on 1313-333) RMS = 7.6 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Ma=MATERA On=ONSALA60 Wz=WETTZELL Hh Kk Ma On Wz Avg % obs. time: 36 21 62 64 69 51 % cal. time: 2 1 4 3 3 3 % slew time: 36 5 28 17 8 19 % idle time: 26 72 5 15 18 28 total # scans: 195 96 305 279 295 234 # scans/hour : 8 4 13 12 12 10 Avg scan (sec): 158 190 177 198 203 185 # data tracks: 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 Total TB(M5): 3.93 2.33 6.91 7.08 7.68 5.59 # OF OBSERVATIONS BY BASELINE | Hh Kk Ma On Wz Total ----------------------------------- Hh| 0 195 168 181 544 Kk| 88 89 95 272 Ma| 272 288 843 On| 263 792 Wz| 827 Number of 2-station scans: 7 Number of 3-station scans: 68 Number of 4-station scans: 238 Number of 5-station scans: 0 Total number of scans: 313 Total number of obs: 1639 Total integrated obs-time: 268683 Average obs-time: 163.9 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: | 356| 192| 191| 156| 106| 104| 66| 71| 57| 47| 35| 16| 16| 17| 13| 29| 20| 20| 127| Average X-band SNRs by baseline | Hh Kk Ma On Wz AVG ---------------------------------- Hh| - 89 78 124 97 Kk| 39 39 69 50 Ma| 105 182 120 On| 169 113 Wz| 152 Average S-band SNRs by baseline | Hh Kk Ma On Wz AVG ---------------------------------- Hh| - 46 40 62 49 Kk| 47 48 76 58 Ma| 44 70 54 On| 70 52 Wz| 69 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO KOKEE MATERA 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 Density Passes Hh HARTRAO Mark5B Kk KOKEE Mark5B Ma MATERA Mark5B 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 Ma On Hh Kk Ma On Kk 20 Kk 15 Ma 20 20 Ma 15 15 On 20 20 20 On 15 15 15 Wz 20 20 20 20 Wz 15 15 15 15 ===========================================================