Session Notes for rd2205 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2205 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 for all stations with an offset of 10 seconds. Wettzell (Wz) and Kokee (Kk) will observe INT I22131 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2205 Description R&D-05/2022 Scheduler: OSO Correlator: WASH Start: 2022-131-18:00:00 End: 2022-132-18:00:00 Current yyyyddd: 2022131 (2022.36) ( 19711 MJD, WED. 11MAY.) Greenwich sidereal time: 09:18:00 (18:00:00 UT) Sun's RA and DEC: 3h 14.4m 18d 0.7 =========================================================== First observations Observation listing from file ./rd2205.skd for experiment RD2205 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ny Ns On Wz 0300+470 22131-180000| 88 40 84 127 46 127| 1726+455 22131-180258| 125 47 80 125 69 103| 1044+719 22131-180538| 40 153 158 131 158| 1236+077 22131-180916| 198 236 257 520 520 344| 1130+009 22131-181418| 110 125 125 | 0812+367 22131-181915| 86 116 144 144 124 | End of listing. =========================================================== Last observations Observation listing from file ./rd2205.skd for experiment RD2205 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ny Ns On Wz 0743-006 22132-172954| 40 40 40 | 1236+077 22132-173436| 198 238 132 383 383 353| 1130+009 22132-173938| 111 111 108 | 1758+388 22132-174404| 652 268 216 406 652 390| 1441+252 22132-174949| 107 113 113 | 0812+367 22132-175643| 187 187 40 94 187 94| 1743+173 22132-175858| 52 52 | End of listing. =========================================================== SKED Summary from file ./rd2205.skd for experiment RD2205 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 5.5 Min = 0.0 Max = 44.3 (Baseline Hh-Ny on 2131-021) RMS = 4.1 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Hh Kk Mc Ny Ns On Wz Avg % obs. time: 32 47 61 69 73 78 72 62 % cal. time: 1 2 3 3 2 2 2 2 % slew time: 21 7 32 16 1 12 5 14 % idle time: 44 43 3 11 23 7 20 22 total # scans: 113 143 232 256 163 188 172 181 # scans/hour : 5 6 10 11 7 8 7 8 Avg scan (sec): 244 284 228 232 385 357 360 298 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 3.53 5.20 6.76 7.59 8.02 8.58 7.93 6.80 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc Ny Ns On Wz Total --------------------------------------------- Hh| 0 102 99 59 83 68 411 Kk| 112 139 89 90 90 520 Mc| 213 147 184 170 928 Ny| 163 174 159 947 Ns| 145 130 733 On| 167 843 Wz| 784 Number of 2-station scans: 29 Number of 3-station scans: 61 Number of 4-station scans: 16 Number of 5-station scans: 52 Number of 6-station scans: 117 Number of 7-station scans: 0 Total number of scans: 275 Total number of obs: 2583 Total integrated obs-time: 702949 Average obs-time: 272.1 Histogram of observation durations Dur: 35 70 105 140 175 210 245 280 315 350 385 420 455 490 525 560 595 630 665 700 735 #Obs: | 484| 255| 234| 180| 160| 153| 144| 87| 93| 78| 101| 63| 66| 75| 39| 27| 44| 44| 70| 186| Average X-band SNRs by baseline | Hh Kk Mc Ny Ns On Wz AVG -------------------------------------------- Hh| - 78 71 49 74 65 69 Kk| 38 56 37 38 34 42 Mc| 88 56 91 84 76 Ny| 84 88 72 78 Ns| 57 49 58 On| 74 74 Wz| 66 Average S-band SNRs by baseline | Hh Kk Mc Ny Ns On Wz AVG -------------------------------------------- Hh| - 36 40 22 33 34 34 Kk| 39 49 27 38 39 39 Mc| 37 19 36 39 34 Ny| 28 37 35 37 Ns| 19 20 22 On| 35 33 Wz| 34 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO 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 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 Ny Ns On Hh Kk Mc Ny Ns On Kk 20 Kk 15 Mc 20 20 Mc 15 15 Ny 20 20 20 Ny 15 15 15 Ns 20 20 20 20 Ns 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 ===========================================================