Session Notes for rd2503 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2503 will observe a total of 66 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 I25147 from 1730 UT to 1845 UT / DOY 147 INT II5147 from 2315 UT to 0045 UT / DOY 147-148 During the time, Wettzell (Wz) will observe: INT I25148 from 1715 UT to 1730 UT / DOY 148 The fill command was used for all stations using a fill offset of 10 seconds. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2503 Description R&D-05/2025 Scheduler: OSO Correlator: SHAO Start: 2025-147-17:30:00 End: 2025-148-17:30:00 Current yyyyddd: 2025147 (2025.40) ( 20823 MJD, TUES 27MAY.) Greenwich sidereal time: 09:52:05 (17:30:00 UT) Sun's RA and DEC: 4h 19.3m 21d 25.3 =========================================================== First observations Observation listing from file ./rd2503.skd for experiment RD2503 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Km Wz Yg 1511-100 25147-173000| 140 102 40 140| 1933-400 25147-173330| 111 88 111| 2029+121 25147-173734| 40 40 40| 2150+173 25147-173923| 242 123 242| 1739+522 25147-174413| 40 40| 1743+173 25147-174910| 324 356 356| 1313-333 25147-175856| 40 40 86 86| End of listing. =========================================================== Last observations Observation listing from file ./rd2503.skd for experiment RD2503 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Km Wz Yg 1739+522 25148-171241| 117 40 40 117| 1045-188 25148-171413| 47 47 | 2150+173 25148-171549| 279 380 123 380| 2244-372 25148-172317| 106 138 138| 1111+149 25148-172344| 51 51 | 0010-401 25148-172623| 85 114 114| 1313-333 25148-172747| 133 133 | 0116-219 25148-172908| 52 52 | End of listing. =========================================================== SKED Summary from file ./rd2503.skd for experiment RD2503 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 9.4 Min = 0.0 Max = 69.7 (Baseline Ho-Km on 4C39.25 ) RMS = 8.7 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING Wz=WETTZELL Yg=YARRA12M Hh Ho Kk Km Wz Yg Avg % obs. time: 33 53 54 27 53 71 49 % cal. time: 1 3 2 3 2 3 2 % slew time: 23 30 8 65 5 8 24 % idle time: 42 13 35 3 39 18 26 total # scans: 116 222 170 281 171 227 197 # scans/hour : 5 9 7 12 7 9 8 Avg scan (sec): 244 206 274 84 268 271 224 # data tracks: 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 Total TB(M5): 3.63 5.86 5.96 3.01 5.86 7.86 5.36 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Km Wz Yg Total ---------------------------------------- Hh| 50 0 79 81 62 272 Ho| 121 176 52 172 571 Kk| 147 70 121 459 Km| 142 182 726 Wz| 88 433 Yg| 625 Number of 2-station scans: 84 Number of 3-station scans: 113 Number of 4-station scans: 120 Number of 5-station scans: 40 Number of 6-station scans: 0 Total number of scans: 357 Total number of obs: 1543 Total integrated obs-time: 269847 Average obs-time: 174.9 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: | 517| 154| 124| 106| 96| 92| 46| 63| 36| 49| 57| 38| 15| 18| 23| 4| 7| 9| 89| Average X-band SNRs by baseline | Hh Ho Kk Km Wz Yg AVG --------------------------------------- Hh| 94 - 81 124 46 88 Ho| 73 95 104 58 80 Kk| 67 64 39 61 Km| 99 50 77 Wz| 51 89 Yg| 50 Average S-band SNRs by baseline | Hh Ho Kk Km Wz Yg AVG --------------------------------------- Hh| 45 - 54 65 32 51 Ho| 56 46 44 31 43 Kk| 62 72 39 56 Km| 56 33 49 Wz| 33 54 Yg| 33 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO HOBART26 KOKEE KUNMING WETTZELL YARRA12M 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 Ho HOBART26 Mark5B Kk KOKEE Mark5B Km KUNMING Mark5B Wz WETTZELL 17640feet (Thin ) 56250 (HIGH ) 1 Yg YARRA12M Mark5B =========================================================== 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 Ho Kk Km Wz Hh Ho Kk Km Wz Ho 20 Ho 15 Kk 20 20 Kk 15 15 Km 20 20 20 Km 15 15 15 Wz 20 20 20 20 Wz 15 15 15 15 Yg 20 20 20 20 20 Yg 15 15 15 15 15 ===========================================================