Session Notes for rd2008 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2008 will observe a total of 57 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 I20253 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2008 Description R&D-09/2020 Scheduler: OSO Correlator: WASH Start: 2020-253-17:30:00 End: 2020-254-17:30:00 Current yyyyddd: 2020253 (2020.69) ( 19102 MJD, WED. 9SEP.) Greenwich sidereal time: 16:46:53 (17:30:00 UT) Sun's RA and DEC: 11h 14.0m 4d 56.5 =========================================================== First observations Observation listing from file ./rd2008.skd for experiment RD2008 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ma Ny On Wz 0954+658 20253-173000| 52 100 40 49 52 100| 2136+141 20253-173241| 40 140 220 209 220| 1055+018 20253-173259| 94 94 | 1633+38 20253-173735| 40 106 84 98 78 106| 1123+264 20253-174026| 322 411 375 148 411 159| 1502+106 20253-174347| 121 236 236| 1743+173 20253-174839| 280 226 241 77 280 116| End of listing. =========================================================== Last observations Observation listing from file ./rd2008.skd for experiment RD2008 Source Start DURATIONS name yyddd-hhmmss Ft Hh Kk Ma Ny On Wz 1510-089 20254-170109| 53 40 92 40 92| 1800+440 20254-170514| 278 344 286 328 200 344| 1123+264 20254-171208| 319 337 337 147 315 169| 2029+121 20254-171608| 103 60 103| 1038+52B 20254-171900| 320 320 310 154 320 152| 1743+173 20254-172255| 80 68 80| 1342+663 20254-172520| 270 270 270 113 225 110| 1502+106 20254-172801| 109 109 109| End of listing. =========================================================== SKED Summary from file ./rd2008.skd for experiment RD2008 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 9.5 Min = 0.0 Max = 49.7 (Baseline Kk-Ma on 2029+121) RMS = 6.2 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Kk=KOKEE Ma=MATERA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ft Hh Kk Ma Ny On Wz Avg % obs. time: 62 43 35 68 60 72 70 59 % cal. time: 2 2 2 3 3 3 4 3 % slew time: 27 36 6 24 16 14 10 20 % idle time: 8 18 57 5 19 10 15 19 total # scans: 204 200 137 254 263 231 317 229 # scans/hour : 9 8 6 11 11 10 13 10 Avg scan (sec): 261 185 218 230 199 270 192 221 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 6.81 4.74 3.83 7.49 6.69 7.99 7.77 6.47 # OF OBSERVATIONS BY BASELINE | Ft Hh Kk Ma Ny On Wz Total --------------------------------------------- Ft| 146 52 188 139 187 183 895 Hh| 0 165 127 150 181 769 Kk| 84 130 76 132 474 Ma| 184 229 234 1084 Ny| 170 250 1000 On| 214 1026 Wz| 1194 Number of 2-station scans: 7 Number of 3-station scans: 85 Number of 4-station scans: 39 Number of 5-station scans: 91 Number of 6-station scans: 121 Number of 7-station scans: 0 Total number of scans: 343 Total number of obs: 3221 Total integrated obs-time: 623368 Average obs-time: 193.5 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 #Obs: | 664| 273| 348| 317| 278| 192| 179| 155| 151| 130| 85| 46| 54| 86| 65| 39| 25| 27| 107| Average X-band SNRs by baseline | Ft Hh Kk Ma Ny On Wz AVG -------------------------------------------- Ft| 65 39 63 66 50 82 64 Hh| - 117 147 94 158 117 Kk| 44 61 39 68 54 Ma| 141 115 194 123 Ny| 126 219 138 On| 155 105 Wz| 156 Average S-band SNRs by baseline | Ft Hh Kk Ma Ny On Wz AVG -------------------------------------------- Ft| 35 38 30 26 26 36 31 Hh| - 55 49 49 64 51 Kk| 46 60 43 67 54 Ma| 47 48 72 51 Ny| 48 72 53 On| 62 47 Wz| 63 =========================================================== 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 NYALES20 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 Density Passes Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Kk KOKEE Mark5B Ma MATERA Mark5B Ny NYALES20 Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 1 Wz WETTZELL Mark5B =========================================================== 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 Ny On Ft Hh Kk Ma Ny On Hh 20 Hh 15 Kk 20 20 Kk 15 15 Ma 20 20 20 Ma 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 ===========================================================