Session Notes for rd1303.skd Prepared by K. Le Bail and J. Gipson, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== Vetting of sources for the good geodetic catalog and GAIA proposal sources (category 4) Good geodetic sources are scarce. In 2011, 39 of them were removed because of time variability of their position (Special Handling Sources). As for now, there are 266 sources in source.cat.geodetic.good. To select a set of additional geodetic sources, we use Jing Sun's approach descrebed in her PhD thesis. Our criteria is as followed, slightly modified from Sun's: - The structure index SI is less than or equal to 2.5 (IERS technical note no 35, Table 1, 701 sources); - The X-band flux of the sources is greater than 0.25 Jy (flux.cat, 658 sources). We obtain a set of 152 sources. 105 are in our initial list of good geodetic sources, 47 are not. We are interested in these 47 sources which are not in our geodetic catalog. The goal is two-fold. First we want to verify that we can actually observe these sources. Second we want to get accurate flux models for the sources. Assuming that we successfully detect these sources we will add them to the geodetic catalog. In the last R&D session (RD1302), we scheduled 29 sources and 18 were remaining sources in our list. In this R&D session, we added 14 more sources from the vetting sources proposal. We also added 7 sources from the category 4 of the GAIA proposal from the Observatory of Bordeaux. These sources have a poor position accuracy because they have been observed in very few sessions (1, 2, 4 or 9). The goal is to be able to obtain a better position for these sources. Kokee and Wettzell will observe INT I13134 during the time from 1815 UT to 1945 UT. ----- Parameter listing -------------------------------------- Experiment: RD1303 Description R&D-03/2013 Scheduler: NASA Correlator: HAYS Start: 2013-134-17:30:00 End: 2013-135-17:30:00 Current yyyyddd: 2013134 (2013.37) ( 16427 MJD, TUES 14MAY.) Greenwich sidereal time: 9: 0: 0.00 (17:30: 0 UT) Sun's RA and DEC: 3h 26.8m 18d 47.4 =========================================================== First observations Observation listing from file ./rd1303.skd for experiment RD1303 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Ny On Tc Wz 1502+036 13134-173000| 139 127 116 139 94| 2255-282 13134-173000| 235 235 | End of listing. =========================================================== Last observations Observation listing from file ./rd1303.skd for experiment RD1303 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Ny On Tc Wz 0308-611 13135-172334| 158 158 | 0008-264 13135-172804| 58 58 | 1324+224 13135-172818| 52 56 56 43| End of listing. =========================================================== SKED Summary from file ./rd1303.skd for experiment RD1303 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 3.5 Min = 0.0 Max = 110.8 (Baseline Kk-Ny on 2254+074) RMS = 8.4 Total time: 1439 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Ny=NYALES20 On=ONSALA60 Tc=TIGO Wz=WETTZELL Hh Ho Kk Ny On Tc Wz Avg % obs. time: 40 37 32 49 35 53 47 42 % cal. time: 3 2 2 3 3 3 3 3 % slew time: 52 33 14 16 17 3 11 21 % idle time: 4 26 50 31 45 40 37 34 total # scans: 244 214 198 268 241 222 297 240 # scans/hour : 10 9 8 11 10 9 12 10 Avg scan (sec): 141 151 140 157 124 206 137 150 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total GBytes: 2469 2323 2001 3021 2149 3295 2924 2597 Total GB(M5): 2195 2065 1779 2686 1910 2929 2599 2309 # of tapes : 1.0 1.0 1.0 1.0 1.0 1.0 1.0 tape change times (hhmm): Total number of tapes: 7.0 Total GBytes (M5) recorded: 16162.1 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Ny On Tc Wz Total --------------------------------------------- Hh| 77 0 53 95 131 103 459 Ho| 84 18 10 112 19 320 Kk| 97 61 44 57 343 Ny| 151 15 200 534 On| 35 184 536 Tc| 46 383 Wz| 609 Number of 2-station scans: 318 Number of 3-station scans: 212 Number of 4-station scans: 93 Number of 5-station scans: 8 Number of 6-station scans: 0 Number of 7-station scans: 0 Total # of scans, observations: 631 1592 Average X-band SNRs by baseline | Hh Ho Kk Ny On Tc Wz AVG -------------------------------------------- Hh| 51 - 34 40 21 66 42 Ho| 35 31 29 18 38 33 Kk| 42 34 18 47 36 Ny| 59 17 68 55 On| 23 83 58 Tc| 25 20 Wz| 66 Average S-band SNRs by baseline | Hh Ho Kk Ny On Tc Wz AVG -------------------------------------------- Hh| 52 - 23 24 15 31 28 Ho| 33 28 18 19 24 31 Kk| 30 27 15 31 28 Ny| 26 12 31 28 On| 13 33 27 Tc| 13 16 Wz| 30 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode setup for: HARTRAO HOBART26 KOKEE NYALES20 ONSALA60 TIGOCONC WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 506.368 Mbits 253.184 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 8.00 MHz 1 16(*2) 32 0.00 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 channels recorded per sub-pass X S Total 19.780 11.868 31.648 =========================================================== Tape types ID Station Tape length Density Passes Hh HARTRAO Mark5B Ho HOBART26 Mark5A Kk KOKEE Mark5B Ny NYALES20 Mark5B On ONSALA60 Mark5A Tc TIGOCONC Mark5B Wz WETTZELL Mark5A =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) Hh Ho Kk Ny On Tc Hh Ho Kk Ny On Tc Ho 20 Ho 15 Kk 20 20 Kk 15 15 Ny 20 20 20 Ny 15 15 15 On 20 20 20 20 On 15 15 15 15 Tc 15 15 15 15 15 Tc 12 12 12 12 12 Wz 20 20 20 20 20 15 Wz 15 15 15 15 15 12 ===========================================================