Session Notes for rd2403 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2403 will observe a total of 55 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 I24094 from 1800 UT to 1845 UT / DOY 094 INT II4094 from 2315 UT to 0045 UT / DOYS 094-095 INT I24095 from 1715 UT to 1800 UT / DOY 095 The fill command was used for all stations using a fill offset of 10 seconds. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2403 Description R&D-04/2024 Scheduler: OSO Correlator: SHAO Start: 2024-094-17:30:00 End: 2024-095-17:30:00 Current yyyyddd: 2024094 (2024.26) ( 20404 MJD, WED. 3APR.) Greenwich sidereal time: 06:20:08 (17:30:00 UT) Sun's RA and DEC: 0h 53.2m 5d 41.8 =========================================================== First observations Observation listing from file ./rd2403.skd for experiment RD2403 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ma Ns On Wz 0754+100 24094-173000| 161 279 187 279 233 | 0234+285 24094-173514| 176 53 176 111 | 1147+245 24094-173849| 150 71 150 78 | 0159+723 24094-174200| 276 103 276 100 | 4C39.25 24094-174535| 40 106 106 | 0528+134 24094-174946| 480 480 480 480 480 | End of listing. =========================================================== Last observations Observation listing from file ./rd2403.skd for experiment RD2403 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ma Ns On Wz 1221+809 24095-165508| 104 78 79 104| 0636+680 24095-165734| 480 289 480 328 347| 0949+354 24095-170413| 125 227 285 285| 0506+056 24095-171019| 480 128 223 480 259 114| 1739+522 24095-171310| 110 110| 0823-223 24095-171539| 108 237 237 | 0812+367 24095-172118| 480 480 146 434 211 | 0529+483 24095-172609| 72 72 | 1044+719 24095-172907| 53 53 53 | End of listing. =========================================================== SKED Summary from file ./rd2403.skd for experiment RD2403 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.7 Min = 0.0 Max = 27.3 (Baseline Kk-Wz on 1147+245) RMS = 4.4 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: 60 38 37 67 69 72 65 58 % cal. time: 2 2 2 3 2 3 3 2 % slew time: 20 30 6 25 1 16 9 16 % idle time: 16 29 55 5 27 9 22 24 total # scans: 166 161 130 252 169 238 284 200 # scans/hour : 7 7 5 11 7 10 12 8 Avg scan (sec): 314 204 244 228 351 260 197 256 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 6.66 4.20 4.05 7.36 7.59 7.92 7.18 6.42 # OF OBSERVATIONS BY BASELINE | Ft Hh Kk Ma Ns On Wz Total --------------------------------------------- Ft| 82 57 136 93 131 136 635 Hh| 0 134 64 127 139 546 Kk| 89 77 81 122 426 Ma| 149 235 218 961 Ns| 151 150 684 On| 205 930 Wz| 970 Number of 2-station scans: 34 Number of 3-station scans: 61 Number of 4-station scans: 64 Number of 5-station scans: 103 Number of 6-station scans: 63 Number of 7-station scans: 0 Total number of scans: 325 Total number of obs: 2576 Total integrated obs-time: 587420 Average obs-time: 228.0 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: | 258| 171| 209| 204| 221| 132| 146| 139| 92| 112| 120| 78| 72| 59| 39| 42| 57| 41| 384| Average X-band SNRs by baseline | Ft Hh Kk Ma Ns On Wz AVG -------------------------------------------- Ft| 45 33 44 36 37 63 45 Hh| - 69 54 60 89 67 Kk| 45 55 44 81 55 Ma| 70 95 158 90 Ns| 78 122 75 On| 147 86 Wz| 118 Average S-band SNRs by baseline | Ft Hh Kk Ma Ns On Wz AVG -------------------------------------------- Ft| 28 45 23 17 21 33 27 Hh| - 36 22 33 45 35 Kk| 49 40 47 77 54 Ma| 22 38 56 38 Ns| 24 35 26 On| 57 38 Wz| 51 =========================================================== 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 ===========================================================