Session Notes for rd2308 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2308 will observe a total of 54 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. Wettzell (Wz) and Kokee (Kk) will observe INT I23256 during the time from 1815 UT to 1945 UT and INT II3256 during the time from 2315 UT to 0045 UT. The fill command was used for all stations except Ma and Ns using a fill offset of 10 seconds. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2308 Description R&D-09/2023 Scheduler: OSO Correlator: SHAO Start: 2023-256-18:00:00 End: 2023-257-18:00:00 Current yyyyddd: 2023256 (2023.70) ( 20201 MJD, WED. 13SEP.) Greenwich sidereal time: 17:29:52 (18:00:00 UT) Sun's RA and DEC: 11h 25.8m 3d 41.2 =========================================================== First observations Observation listing from file ./rd2308.skd for experiment RD2308 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ma Ns On Wz 1633+38 23256-180000| 129 129 40 64 49 80| 1221+809 23256-180212| 384 290 315 384 152| 1511-100 23256-180531| 40 40 40| 2029+121 23256-181029| 156 120 71 156 156 40| 0123+257 23256-181149| 191 191| 1743+173 23256-181526| 293 172 137 293 183 | 2201+315 23256-181946| 40 40 | End of listing. =========================================================== Last observations Observation listing from file ./rd2308.skd for experiment RD2308 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ma Ns On Wz 1101+384 23257-172254| 720 450 720 720 511| 0123+257 23257-173211| 169 215 215| 1347+539 23257-173634| 617 617 290 613 341 369| 2127-096 23257-174355| 207 227 227 227| 2201+315 23257-174848| 40 40 | 1842-289 23257-175008| 148 129 148 148| 1738+476 23257-175041| 71 71 | 1511-100 23257-175541| 59 40 40 50 59| 1800+440 23257-175809| 40 111 111| 1531-352 23257-175831| 89 89 | End of listing. =========================================================== SKED Summary from file ./rd2308.skd for experiment RD2308 (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 = 45.0 (Baseline Ft-Kk on 2232-488) RMS = 5.2 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Kk=KOKEE Ma=MATERA Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Ft Hh Kk Ma Ns On Wz Avg % obs. time: 52 42 38 65 63 76 69 58 % cal. time: 1 2 1 2 2 2 2 2 % slew time: 16 32 5 18 1 11 7 13 % idle time: 30 24 55 14 34 10 21 27 total # scans: 108 151 104 182 135 176 207 151 # scans/hour : 5 6 4 8 6 7 9 6 Avg scan (sec): 419 240 318 306 400 373 287 334 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 5.79 4.63 4.24 7.14 6.91 8.40 7.60 6.39 # OF OBSERVATIONS BY BASELINE | Ft Hh Kk Ma Ns On Wz Total --------------------------------------------- Ft| 73 22 76 44 62 73 350 Hh| 0 113 38 96 114 434 Kk| 48 75 52 78 275 Ma| 83 154 152 626 Ns| 98 92 430 On| 144 606 Wz| 653 Number of 2-station scans: 70 Number of 3-station scans: 65 Number of 4-station scans: 62 Number of 5-station scans: 60 Number of 6-station scans: 30 Number of 7-station scans: 0 Total number of scans: 287 Total number of obs: 1687 Total integrated obs-time: 548723 Average obs-time: 325.3 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: | 251| 82| 93| 131| 64| 57| 138| 129| 71| 89| 53| 47| 33| 30| 110| 34| 35| 34| 21| 185| Average X-band SNRs by baseline | Ft Hh Kk Ma Ns On Wz AVG -------------------------------------------- Ft| 50 36 42 41 42 66 48 Hh| - 60 50 54 94 65 Kk| 50 43 47 70 52 Ma| 65 73 124 76 Ns| 67 91 63 On| 132 78 Wz| 103 Average S-band SNRs by baseline | Ft Hh Kk Ma Ns On Wz AVG -------------------------------------------- Ft| 23 29 17 13 18 25 20 Hh| - 27 18 25 39 28 Kk| 34 22 36 47 34 Ma| 16 24 36 26 Ns| 17 21 18 On| 40 27 Wz| 36 =========================================================== 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 MATERA 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 Ma MATERA 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) Ft Hh Kk Ma Ns On Ft Hh Kk Ma Ns On Hh 20 Hh 15 Kk 20 20 Kk 15 15 Ma 20 20 20 Ma 15 15 15 Ns 20 20 20 20 Ns 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 ===========================================================