Session Notes for rd2405 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2405 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. During the time, Wettzell (Wz) and Kokee (Kk) will observe: INT I24178 from 1730 UT to 1845 UT / DOYS 178 INT II4178 from 2315 UT to 0045 UT / DOYS 178-179 INT I24179 from 1715 UT to 1800 UT / DOY 179 The fill command was used for all stations using a fill offset of 10 seconds. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2405 Description R&D-06/2024 Scheduler: OSO Correlator: WASH Start: 2024-178-18:00:00 End: 2024-179-18:00:00 Current yyyyddd: 2024178 (2024.49) ( 20488 MJD, WED. 26JUN.) Greenwich sidereal time: 12:21:24 (18:00:00 UT) Sun's RA and DEC: 6h 24.5m 23d 19.0 =========================================================== First observations Observation listing from file ./rd2405.skd for experiment RD2405 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz 1633+38 24178-180000| 40 65 198 198 | 1147+245 24178-180442| 138 76 138 113 | 4C39.25 24178-180735| 40 71 71 | 1044+719 24178-180952| 40 97 97 | 1012+232 24178-181243| 532 592 600 600 | 1256-220 24178-182439| 40 101 101 | 1511-100 24178-182743| 186 40 186 | End of listing. =========================================================== Last observations Observation listing from file ./rd2405.skd for experiment RD2405 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz 1256-220 24179-170127| 40 100 140 140| 1012+232 24179-170511| 532 600 600 600 367| 0444+634 24179-171200| 180 180| 1743+173 24179-171943| 223 286 333 333 | 1443-162 24179-172621| 360 417 422 | 1555+001 24179-173417| 91 179 242 | 1145-071 24179-173928| 135 178 204 | 1022+194 24179-174356| 282 359 447 | 1511-100 24179-175238| 40 103 132 | 1236+077 24179-175557| 243 243 243 | End of listing. =========================================================== SKED Summary from file ./rd2405.skd for experiment RD2405 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 5.8 Min = 0.0 Max = 24.1 (Baseline Kk-Mc on 1147+245) RMS = 3.7 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Hh Kk Mc Ns On Wz Avg % obs. time: 34 42 62 57 76 70 57 % cal. time: 1 1 3 1 2 2 2 % slew time: 24 4 31 1 13 6 14 % idle time: 39 53 3 40 8 20 28 total # scans: 120 92 218 126 196 201 158 # scans/hour : 5 4 9 5 8 8 7 Avg scan (sec): 248 390 247 390 335 302 318 # data tracks: 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 Total TB(M5): 3.80 4.59 6.90 6.28 8.42 7.76 6.29 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc Ns On Wz Total ---------------------------------------- Hh| 0 111 36 101 98 346 Kk| 83 73 76 92 324 Mc| 117 193 184 688 Ns| 116 109 451 On| 161 647 Wz| 644 Number of 2-station scans: 15 Number of 3-station scans: 53 Number of 4-station scans: 76 Number of 5-station scans: 92 Number of 6-station scans: 0 Total number of scans: 236 Total number of obs: 1550 Total integrated obs-time: 458606 Average obs-time: 295.9 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: | 177| 132| 111| 114| 113| 70| 66| 42| 57| 31| 39| 45| 55| 37| 53| 22| 34| 47| 305| Average X-band SNRs by baseline | Hh Kk Mc Ns On Wz AVG --------------------------------------- Hh| - 63 34 51 92 65 Kk| 53 35 51 86 58 Mc| 56 107 187 106 Ns| 58 101 62 On| 169 98 Wz| 139 Average S-band SNRs by baseline | Hh Kk Mc Ns On Wz AVG --------------------------------------- Hh| - 35 19 29 44 34 Kk| 60 34 57 86 61 Mc| 20 43 64 46 Ns| 21 32 26 On| 61 43 Wz| 58 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO 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 17640feet (Thin ) 56250 (HIGH ) 1 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 Ns On Hh Kk Mc Ns On Kk 20 Kk 15 Mc 20 20 Mc 15 15 Ns 20 20 20 Ns 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 ===========================================================