Session Notes for rd2406 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2406 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. During the time, Wettzell (Wz) and Kokee (Kk) will observe: INT I24191 from 1730 UT to 1845 UT / DOY 191 INT II4191 from 2315 UT to 0045 UT / DOYS 191-192 INT I24192 from 1715 UT to 1800 UT / DOY 192 The fill command was used for all stations using a fill offset of 10 seconds. The station Ft was tagged along. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2406 Description R&D-07/2024 Scheduler: OSO Correlator: SHAO Start: 2024-191-17:30:00 End: 2024-192-17:30:00 Current yyyyddd: 2024191 (2024.52) ( 20501 MJD, TUES 9JUL.) Greenwich sidereal time: 12:42:34 (17:30:00 UT) Sun's RA and DEC: 7h 17.9m 22d 13.6 =========================================================== First observations Observation listing from file ./rd2406.skd for experiment RD2406 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz Km Ft 1717+178 24191-173000| 154 350 412 412 225 | 1424+240 24191-173525| 40 40 | 1347+539 24191-173727| 371 371 | 1130+009 24191-173856| 277 175 277 | 1221+809 24191-174504| 421 480 480 118 | 1933-400 24191-175252| 40 40 | 0805+410 24191-175409| 183 183 | 1550-242 24191-175655| 447 480 480 | 0620+389 24191-175800| 439 439 | 0814+425 24191-180609| 292 292 | End of listing. =========================================================== Last observations Observation listing from file ./rd2406.skd for experiment RD2406 Source Start DURATIONS name yyddd-hhmmss Hh Kk Mc Ns On Wz Km Ft 1550-242 24192-164330| 480 480 480 263 | 0805+410 24192-164444| 241 475 475 | 2155-304 24192-165101| 61 61 | 0722+145 24192-165350| 480 480 480 | 1736+324 24192-165733| 480 409 480 421 | 1104+728 24192-170648| 480 480 480 348 277 | 1424+240 24192-171339| 97 81 97 | 0805+410 24192-171553| 194 180 | 1550-242 24192-171837| 460 480 480 | 0620+389 24192-171942| 480 465 | 1319-093 24192-172854| 66 66 66 | End of listing. =========================================================== SKED Summary from file ./rd2406.skd for experiment RD2406 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 4.6 Min = 0.0 Max = 90.0 (Baseline Kk-Ns on 0722+145) RMS = 6.6 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Mc=MEDICINA Ns=NYALE13S On=ONSALA60 Wz=WETTZELL Km=KUNMING Ft=FORTLEZA Hh Kk Mc Ns On Wz Km Ft Avg % obs. time: 45 36 64 34 71 63 47 2 45 % cal. time: 2 1 2 1 2 2 2 0 2 % slew time: 32 6 25 0 11 5 42 1 16 % idle time: 21 56 8 63 15 29 7 95 37 total # scans: 166 110 185 85 180 179 215 13 141 # scans/hour : 7 5 8 4 8 7 9 1 6 Avg scan (sec): 232 280 299 350 341 305 190 156 268 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 4.93 3.94 7.09 3.81 7.85 6.99 5.24 0.26 5.01 # OF OBSERVATIONS BY BASELINE | Hh Kk Mc Ns On Wz Km Ft Total -------------------------------------------------- Hh| 0 128 21 99 117 126 10 501 Kk| 36 41 52 44 65 3 241 Mc| 29 130 157 139 7 626 Ns| 56 28 32 6 213 On| 123 121 7 588 Wz| 142 8 619 Km| 3 628 Ft| 44 Number of 2-station scans: 102 Number of 3-station scans: 53 Number of 4-station scans: 63 Number of 5-station scans: 83 Number of 6-station scans: 16 Number of 7-station scans: 1 Number of 8-station scans: 0 Total number of scans: 318 Total number of obs: 1730 Total integrated obs-time: 438412 Average obs-time: 253.4 Histogram of observation durations Dur: 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 #Obs: | 166| 104| 130| 84| 81| 88| 100| 83| 103| 85| 64| 51| 59| 35| 58| 40| 42| 43| 314| Average X-band SNRs by baseline | Hh Kk Mc Ns On Wz Km Ft AVG ------------------------------------------------- Hh| - 50 33 43 71 69 35 57 Kk| 40 32 43 49 47 37 43 Mc| 46 66 106 77 42 73 Ns| 46 75 42 29 45 On| 96 61 42 63 Wz| 100 70 90 Km| 43 73 Ft| 43 Average S-band SNRs by baseline | Hh Kk Mc Ns On Wz Km Ft AVG ------------------------------------------------- Hh| - 27 18 24 36 44 27 32 Kk| 40 24 39 43 48 40 40 Mc| 17 27 40 42 25 34 Ns| 17 24 21 15 20 On| 35 34 26 30 Wz| 48 33 39 Km| 33 42 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: 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 17640feet (Thin ) 56250 (HIGH ) 1 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) Hh Kk Mc Ns On Wz Km Hh Kk Mc Ns On Wz Km Kk 20 Kk 15 Mc 20 20 Mc 15 15 Ns 20 20 20 Ns 15 15 15 On 20 20 20 20 On 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 Ft 20 20 20 20 20 20 20 Ft 15 15 15 15 15 15 15 ===========================================================