Session Notes for rd2105 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2105 will observe a total of 71 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 with an offset of 10 seconds. Wettzell and Kokee will observe INT I21174 during the time from 1815 UT to 1945 UT. Nyale13s (Ns) is tagged along. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2105 Description R&D-06/2021 Scheduler: OSO Correlator: SHAO Start: 2021-174-18:00:00 End: 2021-175-18:00:00 Current yyyyddd: 2021174 (2021.48) ( 19389 MJD, WED. 23JUN.) Greenwich sidereal time: 12:08:29 (18:00:00 UT) Sun's RA and DEC: 6h 10.8m 23d 24.7 =========================================================== First observations Observation listing from file ./rd2105.skd for experiment RD2105 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Km Ny On Wz Ns 1743+173 21174-180000| 40 69 44 154 135 157 157| 1511-100 21174-180318| 62 115 115 | 2150+173 21174-180338| 125 104 125 125 | 1823+568 21174-180629| 261 262 232 283 283| 1933-400 21174-180814| 83 40 83 | 2201+315 21174-181147| 85 45 40 60 43 85| 0159+723 21174-181347| 73 40 40 53 73 73| End of listing. =========================================================== Last observations Observation listing from file ./rd2105.skd for experiment RD2105 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Km Ny On Wz Ns 1633+382 21175-174055| 57 40 54 48 70 70| 1823+568 21175-174242| 40 40 40 90 115 115| 0109+224 21175-174428| 125 118 125 | 1443-162 21175-174531| 290 150 265 290 | 0237-027 21175-174830| 48 48 | 1951+355 21175-175113| 306 137 517 517 263 | 1717+178 21175-175615| 215 40 57 215| 0048-427 21175-175749| 121 121 | 1459+480 21175-175806| 104 104 | End of listing. =========================================================== SKED Summary from file ./rd2105.skd for experiment RD2105 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 9.0 Min = 0.0 Max = 102.9 (Baseline Ho-On on 0847-120) RMS = 8.9 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ns=NYALE13S Hh Ho Kk Km Ny On Wz Ns Avg % obs. time: 37 42 55 44 69 71 71 61 56 % cal. time: 2 2 2 4 4 3 4 2 3 % slew time: 34 26 11 44 18 18 9 1 21 % idle time: 26 30 30 6 8 7 15 35 20 total # scans: 185 162 215 364 309 289 309 190 252 # scans/hour : 8 7 9 15 13 12 13 8 11 Avg scan (sec): 173 221 222 105 194 212 199 276 199 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.10 4.59 6.11 4.91 7.67 7.85 7.85 6.71 6.22 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Km Ny On Wz Ns Total -------------------------------------------------- Hh| 54 0 158 108 134 158 51 663 Ho| 79 135 67 53 65 34 487 Kk| 159 165 124 122 116 765 Km| 262 232 269 158 1373 Ny| 243 238 177 1260 On| 248 170 1204 Wz| 156 1256 Ns| 862 Number of 2-station scans: 45 Number of 3-station scans: 72 Number of 4-station scans: 101 Number of 5-station scans: 104 Number of 6-station scans: 117 Number of 7-station scans: 13 Number of 8-station scans: 0 Total number of scans: 452 Total number of obs: 3935 Total integrated obs-time: 612705 Average obs-time: 155.7 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 630 #Obs: | 1221| 461| 454| 410| 289| 199| 156| 133| 83| 78| 55| 49| 38| 58| 36| 33| 37| 28| 9| 108| Average X-band SNRs by baseline | Hh Ho Kk Km Ny On Wz Ns AVG ------------------------------------------------- Hh| 61 - 66 52 39 72 49 58 Ho| 57 84 72 47 86 75 71 Kk| 55 61 39 64 68 57 Km| 92 60 108 74 79 Ny| 83 124 122 92 On| 97 75 69 Wz| 119 100 Ns| 90 Average S-band SNRs by baseline | Hh Ho Kk Km Ny On Wz Ns AVG ------------------------------------------------- Hh| 37 - 44 26 22 37 29 33 Ho| 53 48 28 21 33 38 39 Kk| 61 50 36 53 61 53 Km| 46 35 55 45 48 Ny| 32 45 47 41 On| 40 33 33 Wz| 49 46 Ns| 45 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO HOBART26 KOKEE KUNMING 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 Ho HOBART26 Mark5B Kk KOKEE Mark5B Km KUNMING 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 Ho Kk Km Ny On Wz Hh Ho Kk Km Ny On Wz Ho 20 Ho 15 Kk 20 20 Kk 15 15 Km 20 20 20 Km 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 On 20 20 20 20 20 On 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 Ns 20 20 20 20 20 20 20 Ns 15 15 15 15 15 15 15 ===========================================================