Session Notes for rd2502 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2502 will observe a total of 57 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) will observe: INT I25071 from 1800 UT to 1845 UT / DOY 071 INT II5071 from 2315 UT to 0045 UT / DOY 071-072 INT I25072 from 1715 UT to 1800 UT / DOY 072 The fill command was used for all stations using a fill offset of 10 seconds. Fortleza (Ft) in tagalong mode. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2502 Description R&D-03/2025 Scheduler: OSO Correlator: SHAO Start: 2025-071-18:00:00 End: 2025-072-18:00:00 Current yyyyddd: 2025071 (2025.19) ( 20747 MJD, WED. 12MAR.) Greenwich sidereal time: 05:22:32 (18:00:00 UT) Sun's RA and DEC: 23h 32.1m -3d 0.6 =========================================================== First observations Observation listing from file ./rd2502.skd for experiment RD2502 Source Start DURATIONS name yyddd-hhmmss Kk Km Ma Wz Sh Ft 0954+658 25071-180000| 116 40 116 64 | 1739+522 25071-180257| 67 40 67 | 0159+723 25071-180533| 121 74 121 62 | 1459+480 25071-180856| 325 197 325 272 | 0707+476 25071-181541| 127 217 217 | 1717+178 25071-182220| 213 40 213 | End of listing. =========================================================== Last observations Observation listing from file ./rd2502.skd for experiment RD2502 Source Start DURATIONS name yyddd-hhmmss Kk Km Ma Wz Sh Ft 1044+719 25072-170824| 302 118 266 302 53 | 1147+245 25072-171416| 40 126 44 126 | 0919-260 25072-171901| 40 86 67 | 1012+232 25072-172154| 133 149 138 | 0745+241 25072-172539| 43 164 140 | 1130+009 25072-172947| 411 491 482 | 1022+194 25072-173908| 539 563 543 | 0919-260 25072-174957| 43 83 67 | 1012+232 25072-175247| 135 138 138 | 1147+245 25072-175612| 40 63 48 | 4C39.25 25072-175829| 91 91 91 | End of listing. =========================================================== SKED Summary from file ./rd2502.skd for experiment RD2502 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.3 Min = 0.0 Max = 72.0 (Baseline Kk-Ma on 0306+102) RMS = 8.1 Total time: 1440 minutes ( 24.0 hours). Key: Kk=KOKEE Km=KUNMING Ma=MATERA Wz=WETTZELL Sh=SESHAN25 Ft=FORTLEZA Kk Km Ma Wz Sh Ft Avg % obs. time: 37 38 61 59 55 0 42 % cal. time: 2 3 2 2 3 0 2 % slew time: 8 51 13 5 33 0 19 % idle time: 52 7 24 33 8 99 37 total # scans: 147 273 173 199 271 7 178 # scans/hour : 6 11 7 8 11 0 7 Avg scan (sec): 219 119 302 255 174 48 185 # data tracks: 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 Total TB(M5): 4.12 4.15 6.69 6.49 6.05 0.04 4.59 # OF OBSERVATIONS BY BASELINE | Kk Km Ma Wz Sh Ft Total ---------------------------------------- Kk| 124 69 92 121 3 409 Km| 152 175 263 4 718 Ma| 150 157 3 531 Wz| 174 7 598 Sh| 5 720 Ft| 22 Number of 2-station scans: 34 Number of 3-station scans: 107 Number of 4-station scans: 109 Number of 5-station scans: 49 Number of 6-station scans: 0 Total number of scans: 299 Total number of obs: 1499 Total integrated obs-time: 254579 Average obs-time: 169.8 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: | 525| 150| 127| 136| 85| 61| 45| 45| 47| 35| 27| 28| 37| 11| 12| 20| 9| 16| 83| Average X-band SNRs by baseline | Kk Km Ma Wz Sh Ft AVG --------------------------------------- Kk| 62 32 74 86 28 67 Km| 50 111 217 51 128 Ma| 128 57 30 71 Wz| 132 58 115 Sh| 48 138 Ft| 47 Average S-band SNRs by baseline | Kk Km Ma Wz Sh Ft AVG --------------------------------------- Kk| 71 45 72 65 25 65 Km| 36 64 97 39 71 Ma| 53 29 17 40 Wz| 55 26 59 Sh| 26 66 Ft| 27 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: FORTLEZA Mode Tot.Rate #Chan Chan.BW Tot.BW #BBC #bits Tracks*(fan) Tot.tracks Barrel Mk341:2 1024 Mbps 16 16 Mhz 256 Mhz 14 2 32*(2) 64 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 Recording mode for: KOKEE KUNMING MATERA SESHAN25 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 Ft FORTLEZA Mark5A Kk KOKEE Mark5B Km KUNMING Mark5B Ma MATERA Mark5B Sh SESHAN25 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) Kk Km Ma Wz Sh Kk Km Ma Wz Sh Km 20 Km 15 Ma 20 20 Ma 15 15 Wz 20 20 20 Wz 15 15 15 Sh 20 20 20 20 Sh 15 15 15 15 Ft 20 20 20 20 20 Ft 15 15 15 15 15 ===========================================================