Session Notes for rd2303 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2303 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. Wettzell (Wz) and Kokee (Kk) will observe INT I23102 during the time from 1815 UT to 1945 UT. Tianma60 was scheduled with a lower slewing rate to keep the slewing time lower than 50%. The fill command was used for all stations using a fill offset of 10 seconds. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2303 Description R&D-04/2023 Scheduler: OSO Correlator: SHAO Start: 2023-102-18:00:00 End: 2023-103-18:00:00 Current yyyyddd: 2023102 (2023.28) ( 20047 MJD, WED. 12APR.) Greenwich sidereal time: 07:22:43 (18:00:00 UT) Sun's RA and DEC: 1h 23.5m 8d 46.9 =========================================================== First observations Observation listing from file ./rd2303.skd for experiment RD2303 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ny Ns On T6 Wz 1637+574 23102-180000| 117 40 79 117 81 40 106| 1147+245 23102-180232| 241 62 175 241 173 211| 0300+470 23102-180712| 117 40 295 295 290 282| 2022-077 23102-181107| 199 199 | 0812+367 23102-181325| 86 148 206 206 188 95| 0507+179 23102-181750| 70 132 173 173 165 | End of listing. =========================================================== Last observations Observation listing from file ./rd2303.skd for experiment RD2303 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ny Ns On T6 Wz 1045-188 23103-174446| 40 122 146 171 171| 0444+634 23103-174542| 239 239 | 0743-006 23103-174823| 40 86 40 100 100| 1823+568 23103-175045| 44 48 48 | 0607-157 23103-175106| 40 162 236 236| 0149+218 23103-175251| 74 60 74 | 1221+809 23103-175519| 281 281 281 | 1145-071 23103-175616| 224 224 224 224 224| End of listing. =========================================================== SKED Summary from file ./rd2303.skd for experiment RD2303 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.8 Min = 0.0 Max = 72.0 (Baseline On-T6 on 1045-188) RMS = 8.1 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Ns=NYALE13S On=ONSALA60 T6=TIANMA65 Wz=WETTZELL Hh Kk Mc Ny Ns On T6 Wz Avg % obs. time: 38 48 63 69 68 72 16 70 56 % cal. time: 2 2 2 3 2 2 2 2 2 % slew time: 25 10 25 16 1 12 39 5 17 % idle time: 34 39 9 11 28 13 42 21 25 total # scans: 140 178 197 258 191 195 162 204 190 # scans/hour : 6 7 8 11 8 8 7 9 8 Avg scan (sec): 236 233 278 231 307 320 83 298 248 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.23 5.31 7.02 7.64 7.51 7.98 1.72 7.79 6.15 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc Ny Ns On T6 Wz Total -------------------------------------------------- Hh| 0 118 70 38 105 83 111 525 Kk| 51 147 115 61 55 65 494 Mc| 131 92 160 120 180 852 Ny| 174 140 103 136 901 Ns| 115 68 88 690 On| 104 153 838 T6| 123 656 Wz| 856 Number of 2-station scans: 72 Number of 3-station scans: 89 Number of 4-station scans: 57 Number of 5-station scans: 59 Number of 6-station scans: 46 Number of 7-station scans: 45 Number of 8-station scans: 0 Total number of scans: 368 Total number of obs: 2906 Total integrated obs-time: 639488 Average obs-time: 220.1 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: | 695| 152| 157| 126| 131| 140| 104| 118| 122| 116| 131| 86| 73| 110| 59| 48| 42| 33| 463| Average X-band SNRs by baseline | Hh Kk Mc Ny Ns On T6 Wz AVG ------------------------------------------------- Hh| - 92 87 60 72 215 126 112 Kk| 68 61 40 41 192 90 73 Mc| 107 73 114 233 207 139 Ny| 100 101 257 150 119 Ns| 70 168 105 86 On| 176 162 112 T6| 297 227 Wz| 173 Average S-band SNRs by baseline | Hh Kk Mc Ny Ns On T6 Wz AVG ------------------------------------------------- Hh| - 52 44 19 41 111 64 58 Kk| 41 46 24 35 116 55 48 Mc| 39 19 46 87 72 54 Ny| 25 37 81 50 44 Ns| 19 35 25 24 On| 67 61 45 T6| 100 85 Wz| 63 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO KOKEE MEDICINA NYALES20 NYALE13S ONSALA60 TIANMA65 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 T6 TIANMA65 Mark5B 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 T6 Hh Kk Mc Ny Ns On T6 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 T6 20 20 20 20 20 20 T6 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ===========================================================