Session Notes for rd2110 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2110 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 except Ns with an offset of 10 seconds. Tianma65 (T6) will not observe RD2110 (unavailability due to maintenance). HartRAO (Hh) will not observe RD2110 from 1310 UT on day 349 until the end of the session. Ishioka (Is) will replace Kokee in INT I21348. Kokee (Kk) will observe RD2110 without downtime (no e-transfer). Wettzell (Wz) and Ishioka (Is) will observe INT I21348 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2110 Description R&D-12/2021 Scheduler: OSO Correlator: SHAO Start: 2021-348-17:30:00 End: 2021-349-17:30:00 Current yyyyddd: 2021348 (2021.95) ( 19563 MJD, TUES 14DEC.) Greenwich sidereal time: 23:04:25 (17:30:00 UT) Sun's RA and DEC: 17h 29.3m -23d 14.9 =========================================================== First observations Observation listing from file ./rd2110.skd for experiment RD2110 Source Start DURATIONS name yyddd-hhmmss Hh Is Kk Ma Ny Ns On Wz 0234+285 21348-173000| 40 93 197 40 41 252 252| 1739+522 21348-173217| 40 40 40 40 | 1342+663 21348-173348| 196 196 194 103 | 2022-077 21348-173537| 89 40 64 89| 1637+574 21348-173756| 59 61 40 53 61 43 58| 1842+681 21348-173933| 225 204 192 186 192 202 225| 0954+658 21348-174359| 282 282 263 99 240 274 138| 2136+141 21348-174720| 40 40 40| 1221+809 21348-174930| 483 483 458 108 390 390 199| 0506+056 21348-175342| 235 221 235| End of listing. =========================================================== Last observations Observation listing from file ./rd2110.skd for experiment RD2110 Source Start DURATIONS name yyddd-hhmmss Hh Is Kk Ma Ny Ns On Wz 0954+658 21349-163919| 306 282 261 274 210 210 306| 1637+574 21349-164506| 59 62 40 53 62 43 58| 1459+480 21349-164643| 600 396 600 393 600 600 417| 1726+455 21349-165408| 214 155 214| 0306+102 21349-165852| 281 202 247 252 252 281| 1743+173 21349-170443| 161 133 158 161 133 161| 1823+568 21349-170814| 213 213 99 158 115 155 183| 0221+067 21349-171232| 181 137 163 181 168 180| 0507+179 21349-171611| 171 111 126 171 107 168| 1459+480 21349-171956| 590 409 590 406 590 590 431| 1726+455 21349-172734| 136 136 136| End of listing. =========================================================== SKED Summary from file ./rd2110.skd for experiment RD2110 (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 = 102.9 (Baseline Is-Wz on 0202-172) RMS = 7.0 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Is=ISHIOKA Kk=KOKEE Ma=MATERA Ny=NYALES20 Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Hh Is Kk Ma Ny Ns On Wz Avg % obs. time: 21 67 58 67 67 68 74 69 61 % cal. time: 1 3 3 3 4 3 3 4 3 % slew time: 26 4 12 24 23 2 18 10 15 % idle time: 51 25 26 6 6 27 4 16 21 total # scans: 125 233 225 236 335 227 244 313 242 # scans/hour : 5 10 9 10 14 9 10 13 10 Avg scan (sec): 144 250 224 244 172 257 262 191 217 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 2.31 7.45 6.45 7.36 7.36 7.48 8.19 7.67 6.78 # OF OBSERVATIONS BY BASELINE | Hh Is Kk Ma Ny Ns On Wz Total -------------------------------------------------- Hh| 36 0 89 76 41 76 113 431 Is| 156 141 211 160 158 181 1043 Kk| 107 207 155 128 149 902 Ma| 192 168 212 220 1129 Ny| 217 214 262 1379 Ns| 184 169 1094 On| 222 1194 Wz| 1316 Number of 2-station scans: 29 Number of 3-station scans: 88 Number of 4-station scans: 80 Number of 5-station scans: 42 Number of 6-station scans: 69 Number of 7-station scans: 96 Number of 8-station scans: 0 Total number of scans: 404 Total number of obs: 4244 Total integrated obs-time: 873356 Average obs-time: 205.8 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 #Obs: | 898| 389| 478| 337| 205| 281| 250| 234| 137| 103| 173| 169| 112| 53| 40| 39| 42| 24| 280| Average X-band SNRs by baseline | Hh Is Kk Ma Ny Ns On Wz AVG ------------------------------------------------- Hh| 61 - 63 69 49 57 92 69 Is| 57 52 72 42 48 78 59 Kk| 40 63 34 39 62 51 Ma| 83 57 77 129 77 Ny| 83 90 128 87 Ns| 55 74 59 On| 116 74 Wz| 102 Average S-band SNRs by baseline | Hh Is Kk Ma Ny Ns On Wz AVG ------------------------------------------------- Hh| 46 - 33 37 18 30 46 36 Is| 63 30 39 18 29 45 38 Kk| 41 54 23 38 55 47 Ma| 34 17 33 50 34 Ny| 24 37 49 40 Ns| 17 22 20 On| 48 34 Wz| 45 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO ISHIOKA KOKEE MATERA 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 Is ISHIOKA K5 Kk KOKEE Mark5B Ma MATERA Mark5B 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 Is Kk Ma Ny Ns On Hh Is Kk Ma Ny Ns On Is 20 Is 15 Kk 20 20 Kk 15 15 Ma 20 20 20 Ma 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 Ns 20 20 20 20 20 Ns 15 15 15 15 15 On 20 20 20 20 20 20 On 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ===========================================================