Session Notes for rd2106 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2106 will observe a total of 64 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 I21237 during the time from 1815 UT to 1945 UT. Nyale13s (Ns) and Ishioka (Is) are tagged along. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2106 Description R&D-08/2021 Scheduler: OSO Correlator: WASH Start: 2021-237-18:00:00 End: 2021-238-18:00:00 Current yyyyddd: 2021237 (2021.65) ( 19452 MJD, WED. 25AUG.) Greenwich sidereal time: 16:16:52 (18:00:00 UT) Sun's RA and DEC: 10h 18.8m 10d 29.5 =========================================================== First observations Observation listing from file ./rd2106.skd for experiment RD2106 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc On Wz Is Ns 2145+067 21237-180000| 87 40 65 87 85 | 0010+405 21237-180208| 90 77 79 90 | 0014+813 21237-180440| 48 40 40 48 40 40| 1221+809 21237-180616| 104 55 40 104 | 1147+245 21237-180909| 68 40 66 68 40| 0954+658 21237-181118| 51 40 41 51 40 40| 0949+354 21237-181307| 113 136 136 113 | 1732+389 21237-182010| 40 81 81 40| 1717+178 21237-182249| 40 47 47 40| 1633+38 21237-182525| 40 40 40 40| End of listing. =========================================================== Last observations Observation listing from file ./rd2106.skd for experiment RD2106 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc On Wz Is Ns 2141+175 21238-170946| 520 483 520 520 520| 0010+405 21238-171916| 146 82 127 146 121 134| 1012+232 21238-172328| 242 190 223 242 | 1342+663 21238-172837| 107 50 85 107 82 63| 0804+499 21238-173120| 196 158 196 196 159 113| 1022+194 21238-173526| 182 133 182 182 112| 0636+680 21238-173932| 213 193 211 213 200 147| 0707+476 21238-174356| 292 104 268 292 139 92| 1717+178 21238-175005| 40 134 198 198 40| 2150+173 21238-175435| 166 81 140 166 123| 0444+634 21238-175812| 98 98 98 98 | End of listing. =========================================================== SKED Summary from file ./rd2106.skd for experiment RD2106 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.7 Min = 0.0 Max = 59.2 (Baseline On-Is on 1145-071) RMS = 6.5 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA On=ONSALA60 Wz=WETTZELL Is=ISHIOKA Ns=NYALE13S Hh Kk Mc On Wz Is Ns Avg % obs. time: 32 30 46 67 69 13 24 40 % cal. time: 2 2 4 4 4 1 2 3 % slew time: 33 6 45 19 9 3 1 17 % idle time: 32 62 4 9 17 82 72 40 total # scans: 183 135 330 312 315 127 199 228 # scans/hour : 8 6 14 13 13 5 8 10 Avg scan (sec): 152 189 121 186 189 90 102 147 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 3.57 3.27 5.11 7.45 7.64 1.46 2.61 4.45 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc On Wz Is Ns Total --------------------------------------------- Hh| 0 182 182 172 50 79 665 Kk| 132 117 135 75 111 570 Mc| 310 311 124 198 1257 On| 293 113 187 1202 Wz| 125 187 1223 Is| 94 581 Ns| 856 Number of 2-station scans: 6 Number of 3-station scans: 13 Number of 4-station scans: 107 Number of 5-station scans: 126 Number of 6-station scans: 82 Number of 7-station scans: 0 Total number of scans: 334 Total number of obs: 3177 Total integrated obs-time: 382581 Average obs-time: 120.4 Histogram of observation durations Dur: 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 525 #Obs: | 1145| 310| 356| 363| 218| 165| 103| 98| 85| 77| 31| 32| 19| 16| 25| 15| 18| 14| 22| 65| Average X-band SNRs by baseline | Hh Kk Mc On Wz Is Ns AVG -------------------------------------------- Hh| - 48 40 71 34 40 50 Kk| 30 33 60 29 30 38 Mc| 64 112 34 52 65 On| 107 29 46 62 Wz| 46 69 86 Is| 36 35 Ns| 49 Average S-band SNRs by baseline | Hh Kk Mc On Wz Is Ns AVG -------------------------------------------- Hh| - 25 21 35 24 21 26 Kk| 31 32 55 40 30 38 Mc| 27 42 23 23 30 On| 41 19 20 28 Wz| 28 28 39 Is| 22 25 Ns| 24 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO ISHIOKA 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 Is ISHIOKA K5 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 On Wz Is Hh Kk Mc On Wz Is Kk 20 Kk 15 Mc 20 20 Mc 15 15 On 20 20 20 On 15 15 15 Wz 20 20 20 20 Wz 15 15 15 15 Is 20 20 20 20 20 Is 15 15 15 15 15 Ns 20 20 20 20 20 20 Ns 15 15 15 15 15 15 ===========================================================