Session Notes for rd2401 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2401 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 I24010 from 1800 UT to 1845 UT / DOY 010 INT II4010 from 2315 UT to 0045 UT / DOYS 010-011 INT I24011 from 1715 UT to 1800 UT / DOY 011 The fill command was used for all stations using a fill offset of 10 seconds. Kunming (Km) and Onsala60 (On) are scheduled in a tag-along mode: performance evaluation after a 6-month maintenance period for Km, and issues with its S-band data in week 52 for On. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2401 Description R&D-01/2024 Scheduler: OSO Correlator: WASH Start: 2024-010-18:00:00 End: 2024-011-18:00:00 Current yyyyddd: 2024010 (2024.03) ( 20320 MJD, WED. 10JAN.) Greenwich sidereal time: 01:19:02 (18:00:00 UT) Sun's RA and DEC: 19h 26.5m -21d 56.9 =========================================================== First observations Observation listing from file ./rd2401.skd for experiment RD2401 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Mc Ns Wz Km On 0234+285 24010-180000| 288 47 71 288 40 57| NRAO190 24010-180307| 40 40 | 0202-172 24010-180629| 79 40 79 48| 0227-369 24010-180904| 126 224 224 | 2136+141 24010-181516| 151 229 229 45| 1823+568 24010-182059| 370 311 370 166| 0414-189 24010-183027| 242 226 242 232 | 0116-219 24010-183707| 89 66 89 | 0013-005 24010-184012| 505 561 561 | 1951+355 24010-185145| 720 720 720 720 720 | End of listing. =========================================================== Last observations Observation listing from file ./rd2401.skd for experiment RD2401 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Mc Ns Wz Km On 0149+218 24011-170159| 613 162 194 613 273 64 316| 0414-189 24011-170733| 75 133 133 | 0506+056 24011-171056| 40 58 58 40 | 0812+367 24011-171237| 143 143 143 91| 0227-369 24011-171432| 207 97 207 | 0309+411 24011-172041| 720 425 506 720 166 | 0202-172 24011-173125| 40 40 40| 0237+040 24011-173404| 720 683 720 720 166 | 0406-127 24011-174733| 180 167 242 69 | 0116-219 24011-175309| 100 66 117 | 0306+102 24011-175643| 197 197 197 55 | End of listing. =========================================================== SKED Summary from file ./rd2401.skd for experiment RD2401 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.0 Min = 0.0 Max = 51.7 (Baseline Mc-Wz on 1313-333) RMS = 5.3 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ns=NYALE13S Wz=WETTZELL Km=KUNMING On=ONSALA60 Ft Hh Kk Mc Ns Wz Km On Avg % obs. time: 62 33 32 54 73 66 12 30 45 % cal. time: 2 2 1 3 2 3 2 2 2 % slew time: 19 28 4 37 1 8 14 10 16 % idle time: 16 36 62 5 24 22 72 57 37 total # scans: 139 142 101 260 146 242 132 144 163 # scans/hour : 6 6 4 11 6 10 6 6 7 Avg scan (sec): 388 202 272 181 431 236 76 181 245 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 6.90 3.68 3.52 6.01 8.06 7.30 1.28 3.34 5.01 # OF OBSERVATIONS BY BASELINE | Ft Hh Kk Mc Ns Wz Km On Total -------------------------------------------------- Ft| 72 37 130 88 102 48 81 558 Hh| 0 137 47 110 68 52 486 Kk| 82 63 98 48 57 385 Mc| 133 226 125 134 967 Ns| 135 73 106 645 Wz| 123 131 925 Km| 69 554 On| 630 Number of 2-station scans: 10 Number of 3-station scans: 51 Number of 4-station scans: 75 Number of 5-station scans: 72 Number of 6-station scans: 59 Number of 7-station scans: 17 Number of 8-station scans: 0 Total number of scans: 284 Total number of obs: 2575 Total integrated obs-time: 495238 Average obs-time: 192.3 Histogram of observation durations Dur: 35 70 105 140 175 210 245 280 315 350 385 420 455 490 525 560 595 630 665 700 735 #Obs: | 973| 233| 237| 196| 121| 91| 96| 70| 91| 47| 76| 59| 37| 38| 12| 29| 33| 21| 24| 91| Average X-band SNRs by baseline | Ft Hh Kk Mc Ns Wz Km On AVG ------------------------------------------------- Ft| 42 35 43 41 65 36 34 44 Hh| - 65 49 99 70 53 67 Kk| 48 47 84 54 38 55 Mc| 65 163 78 95 89 Ns| 110 51 59 66 Wz| 100 134 116 Km| 65 71 On| 77 Average S-band SNRs by baseline | Ft Hh Kk Mc Ns Wz Km On AVG ------------------------------------------------- Ft| 23 38 21 15 29 23 17 23 Hh| - 33 18 44 43 27 33 Kk| 43 35 71 60 38 50 Mc| 19 60 43 39 39 Ns| 31 21 18 23 Wz| 51 51 49 Km| 36 41 On| 34 =========================================================== 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: HARTRAO KOKEE KUNMING 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 Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Kk KOKEE Mark5B Km KUNMING 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) Ft Hh Kk Mc Ns Wz Km Ft Hh Kk Mc Ns Wz Km Hh 20 Hh 15 Kk 20 20 Kk 15 15 Mc 20 20 20 Mc 15 15 15 Ns 20 20 20 20 Ns 15 15 15 15 Wz 20 20 20 20 20 Wz 15 15 15 15 15 Km 20 20 20 20 20 20 Km 15 15 15 15 15 15 On 20 20 20 20 20 20 20 On 15 15 15 15 15 15 15 ===========================================================