Session Notes for rd1502 Prepared by K. Le Bail and J. Gipson, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal: observation of 14 sources in category 4, 4 sources in category 3 with bad position uncertainties, and 3 sources in categories 1 and 2 with no observation in the past 12 months. The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted a proposal to observe 195 ICRF2 transfer sources in the context of the GAIA mission. Those 195 sources are divided in four categories. The forth category contains 24 sources which are not part of the IVS monitoring program and which have a poor position accuracy. The goal in observing them in R&D sessions is at first to improve their position accuracy. We noticed that 4 sources in category 3 have a position uncertainties between 100 and 200 microas. They will be observed in this session to improve their uncertainties. Also, 3 sources in categories 1 and 2 have not been observed in the past 12 months, probably because they are weak sources. They will be observed in this session to re-evaluate their flux. In RD1502, we use 20 sources of the GAIA proposal in the astro mode of sked. Forty of the good geodetic sources are used as base of a stable sources set and uniform sky coverage. We use the sked flux catalog except for five sources. These sources have updated flux values in the BVID flux catalog that we use in RD1502. Wettzell and Kokee will observe INT I15098 during the time from 1815 UT to 1945 UT. ----- Parameter listing -------------------------------------- Experiment: RD1502 Description R&D-04/2015 Scheduler: NASA Correlator: HAYS Start: 2015-098-18:00:00 End: 2015-099-18:00:00 Current yyyyddd: 2015098 (2015.27) ( 17121 MJD, WED. 8APR.) Greenwich sidereal time: 07:06:42 (18:00:00 UT) Sun's RA and DEC: 1h 8.6m 7d 17.0 =========================================================== First observations Observation listing from file ./rd1502.skd for experiment RD1502 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Ma Ny On Wz Sh 1324+224 15098-180000| 409 397 436 290 436 224 193| 1418+546 15098-180530| 45 40 40 40| 1803+784 15098-180841| 40 40 40 40 40 | 1244-255 15098-181000| 66 50 66| 0241+622 15098-181204| 101 272 187 272 143 | End of listing. =========================================================== Last observations Observation listing from file ./rd1502.skd for experiment RD1502 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Ma Ny On Wz Sh 0241+622 15098-181204| 101 272 187 272 143 | 1143-332 15098-181246| 207 202 207| 1406-076 15098-181842| 40 40 | 2353+816 15098-181853| 285 187 285 138| 1424-418 15098-182156| 40 40 | 0912+297 15098-182655| 480 480 480 349| 1803+784 15098-183410| 40 40| End of listing. =========================================================== SKED Summary from file ./rd1502.skd for experiment RD1502 (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 Ho-On on 2008-159) RMS = 7.9 Total time: 1439 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Ma=MATERA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Sh=SESHAN25 Hh Ho Kk Ma Ny On Wz Sh Avg % obs. time: 41 46 51 54 65 38 54 51 50 % cal. time: 2 3 2 2 2 2 2 3 2 % slew time: 38 33 12 18 11 14 7 25 20 % idle time: 17 18 34 25 21 45 36 20 28 total # scans: 183 223 176 200 174 180 187 227 193 # scans/hour : 8 9 7 8 7 8 8 9 8 Avg scan (sec): 196 177 249 232 323 180 248 195 224 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 2.3 2.5 2.8 3.0 3.6 2.1 3.0 2.8 2.8 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Ma Ny On Wz Sh Total -------------------------------------------------- Hh| 64 0 108 43 71 84 49 419 Ho| 101 30 31 13 24 138 401 Kk| 19 71 29 34 82 336 Ma| 76 132 115 54 534 Ny| 65 99 73 458 On| 86 51 447 Wz| 71 513 Sh| 518 Number of 2-station scans: 243 Number of 3-station scans: 164 Number of 4-station scans: 73 Number of 5-station scans: 31 Number of 6-station scans: 15 Number of 7-station scans: 5 Number of 8-station scans: 0 Total number of scans: 531 Total number of obs: 1813 Total integrated obs-time: 388277 Average obs-time: 214.2 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: | 486| 89| 71| 74| 139| 68| 109| 48| 26| 27| 64| 48| 68| 39| 84| 77| 53| 62| 181Average X-band SNRs by baseline | Hh Ho Kk Ma Ny On Wz Sh AVG ------------------------------------------------- Hh| 29 - 35 35 30 41 38 35 Ho| 25 27 32 26 30 38 31 Kk| 34 33 29 33 33 30 Ma| 47 45 56 48 45 Ny| 54 56 54 47 On| 59 54 46 Wz| 63 52 Sh| 45 Average S-band SNRs by baseline | Hh Ho Kk Ma Ny On Wz Sh AVG ------------------------------------------------- Hh| 30 - 22 20 19 23 21 23 Ho| 36 21 19 20 23 27 28 Kk| 24 21 25 22 26 27 Ma| 20 20 24 19 21 Ny| 23 22 21 21 On| 24 20 21 Wz| 24 23 Sh| 24 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: HARTRAO HOBART26 KOKEE MATERA NYALES20 ONSALA60 SESHAN25 WETTZELL Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 512 Mbits 256 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 8.00 MHz 1 32(*1) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 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 Hh HARTRAO Mark5B Ho HOBART26 Mark5A Kk KOKEE Mark5B Ma MATERA Mark5B Ny NYALES20 Mark5B On ONSALA60 Mark5B Sh SESHAN25 Mark5B Wz WETTZELL Mark5A =========================================================== 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 Ho Kk Ma Ny On Wz Hh Ho Kk Ma Ny On Wz Ho 20 Ho 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 Sh 20 20 20 20 20 20 20 Sh 15 15 15 15 15 15 15 ===========================================================