Session Notes for rd2103 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2103 will observe a total of 53 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. NYALE13S (Ns) is tagged-along. Wettzell and Kokee will observe INT I21104 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2103 Description R&D-04/2021 Scheduler: OSO Correlator: SHAO Start: 2021-104-18:00:00 End: 2021-105-18:00:00 Current yyyyddd: 2021104 (2021.28) ( 19319 MJD, WED. 14APR.) Greenwich sidereal time: 07:32:31 (18:00:00 UT) Sun's RA and DEC: 1h 32.7m 9d 40.8 =========================================================== First observations Observation listing from file ./rd2103.skd for experiment RD2103 Source Start DURATIONS name yyddd-hhmmss Hh Kk Km Mc On Wz Ns 1055+018 21104-180000| 134 59 40 109 134 | 1342+663 21104-180306| 51 40 40 51 51 40| 1221+809 21104-180442| 84 67 40 56 84 | 1823+568 21104-180657| 48 40 40 47 48 40| 1633+38 21104-180839| 194 128 40 169 194 40| 0812+367 21104-181304| 40 116 75 93 116 40| 0722+145 21104-181545| 48 84 84 70| 0607-157 21104-181856| 40 85 85 | End of listing. =========================================================== Last observations Observation listing from file ./rd2103.skd for experiment RD2103 Source Start DURATIONS name yyddd-hhmmss Hh Kk Km Mc On Wz Ns 4C39.25 21105-172906| 40 162 109 154 162 40| 1045-188 21105-173325| 175 40 52 149 175 | 1738+476 21105-173718| 147 73 64 124 147 57| 0949+354 21105-174048| 136 193 173 179 193 121| 1022+194 21105-174449| 116 185 162 190 190 94| 1236+077 21105-174909| 55 307 187 282 307 | 0607-157 21105-175512| 128 40 102 128 | 0300+470 21105-175810| 100 100 100 100 40| End of listing. =========================================================== SKED Summary from file ./rd2103.skd for experiment RD2103 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 11.4 Min = 0.0 Max = 80.0 (Baseline Km-On on 0035-252) RMS = 8.0 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Km=KUNMING Mc=MEDICINA On=ONSALA60 Wz=WETTZELL Ns=NYALE13S Hh Kk Km Mc On Wz Ns Avg % obs. time: 34 31 42 48 67 69 22 45 % cal. time: 2 1 3 4 3 4 2 3 % slew time: 34 6 34 41 18 9 1 21 % idle time: 28 60 20 6 11 18 73 31 total # scans: 199 125 278 325 300 324 188 248 # scans/hour : 8 5 12 14 13 14 8 10 Avg scan (sec): 149 216 130 128 192 184 103 157 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 3.81 3.45 4.61 5.32 7.39 7.64 2.48 4.96 # OF OBSERVATIONS BY BASELINE | Hh Kk Km Mc On Wz Ns Total --------------------------------------------- Hh| 0 163 187 169 172 65 756 Kk| 82 105 106 121 104 518 Km| 246 226 256 140 1113 Mc| 287 301 171 1297 On| 273 168 1229 Wz| 176 1299 Ns| 824 Number of 2-station scans: 9 Number of 3-station scans: 35 Number of 4-station scans: 64 Number of 5-station scans: 152 Number of 6-station scans: 100 Number of 7-station scans: 0 Total number of scans: 360 Total number of obs: 3518 Total integrated obs-time: 437418 Average obs-time: 124.3 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: | 1092| 375| 423| 397| 237| 228| 145| 134| 81| 80| 65| 48| 45| 33| 28| 16| 15| 6| 70| Average X-band SNRs by baseline | Hh Kk Km Mc On Wz Ns AVG -------------------------------------------- Hh| - 102 74 58 109 42 82 Kk| 66 38 44 75 39 53 Km| 110 93 158 79 109 Mc| 102 173 77 107 On| 167 70 100 Wz| 104 142 Ns| 74 Average S-band SNRs by baseline | Hh Kk Km Mc On Wz Ns AVG -------------------------------------------- Hh| - 62 37 32 52 31 44 Kk| 90 45 50 73 42 59 Km| 61 53 79 51 65 Mc| 41 64 36 49 On| 62 31 46 Wz| 43 63 Ns| 39 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO KOKEE KUNMING 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 Density Passes Hh HARTRAO Mark5B Kk KOKEE Mark5B Km KUNMING 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 Km Mc On Wz Hh Kk Km Mc On Wz Kk 20 Kk 15 Km 20 20 Km 15 15 Mc 20 20 20 Mc 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 Ns 20 20 20 20 20 20 Ns 15 15 15 15 15 15 ===========================================================