CORE-B701
(Continuous Observations of the Rotation of the Earth-B701)
2000 May 10
Notes prepared by
Cynthia Thomas and Nancy Vandenberg,NVI/GSFC
Schedule name: CB701.SKD on CDDISA
Nominal Start: 18:30 U.T. on May 10 (day 131)
first observation at 18:30 U.T. on 1749+096 for SM-NY-TS
first observation at 18:30 U.T. on 0552+398 for AP-YK-65-FT
Nominal Stop: 18:30 U.T. on May 11 (day 132)
last observation at 17:58 U.T. on 0552+398 for YK
last observation at 18:09 U.T. on 0804+499 for SM
last observation at 18:12 U.T. on 1606+106 for NY-TS
last observation at 18:14 U.T. on 0727-115 for 65
last observation at 18:18 U.T. on 0454-234 for AP-FT
Correlator: Haystack
**Frequency Sequence**: CDPSX - Standard CDP SX sequence.
(360 MHz wide at X, 85 MHz wide at S)
1 letter 2 letter
Station Code Code # of tapes # of obs Occupation Code
Algonquin G AP 2 (HDT) 242 72828201
Yellowknife X YK 2 (HDT) 148 72965101
Crimea C SM 2 (HDT) 162 73323401
DSS65 M 65 1 (TT) 273 13313301
Fortaleza F FT 1 (HDT) 139 72974801
Ny Alesund N NY 1 (TT) 267 73313301
Tsukuba T TS 1 (TT) 218 73452301
Purpose
=======
The purpose of the CORE-B sessions is to obtain EOP data on days adjacent
to the main NEOS/CORE-A and CORE-3 sessions and thus extend the span of
continuous data. The secondary purpose of CORE-B is to provide observing
sessions during which the stations can demonstrate their performance and
their ability to participate in future regular CORE sessions.
The CORE-B networks are numbered 7 and 8 to distinguish them from the
networks used in 1999.
Schedule
========
This is a new schedule generated by C. Thomas with the automatic mode of
sked. The characteristics of the CORE-B schedules have changed slightly.
Changes were made to smooth out the distribution of observations over the
sky. Following are the characteristics of the CORE-B schedule file:
1) This schedule was optimized for sky coverage.
2) Only the observations in the previous 2 hours of the schedule were
considered for the minor options. The best 60% of the configurations
were considered for minor options.
3) The "minor options" were set to select observations to maximize the
total number of observations, to minimize the idle time between scans,
and to minimize time between scans on the same source by thirty minutes.
5) The minimum SNR limits for the baselines were set to 20 for X-band
and 15 for S-band, with the exception of the Yellowknife baselines. The
minimum SNR limits for the Yellowknife baselines were set to 15 for X-bannd
and 12 for S-band.
6) This schedule was made using 66 sources which helped improve the sky
coverage.
Simulation Results
==================
Simulated data from this schedule was used in a global solution to
estimate the formal errors. The table below lists the formal errors
for Earth orientation parameters. These results meet the simulation
goals for the CORE-B network.
Also shown in the table are the maximum correlations between the Earth
orientation parameters and other parameters.
____________________________________________
| | | | |
| EOP |Formal| Other | |
|Parameters |Errors|Parameters|Correlation|
|____________|______|_________ |___________|
| | | | |
|X-Wobble | 85.86| ------- | Under 40% |
| | | | |
|Y-Wobble | 75.73| ------- | under 40% |
| | | | |
|UT1-TAI | 2.87| ------- | under 40% |
| | | | |
|UT1-TAI Rate| 4.42| ------- | under 40% |
| | | | |
____________________________________________
Flux Information
================
Several years ago John Gipson wrote a program called snranal which
compares the measured performance of an experiment with respect to the
predicted. One of the things this program calculates is an empirical
flux density for each source. Recently J. Gipson compared the fluxes
generated by this program with those from more careful modeling. The
agreement is generally good (~15%) for those sources which have been
observed more than 20 times. In order to account for changes in the flux
catalog since the last update, J. Gipson adjusted the fluxes in the flux
catalog for the sources in the current source catalog using the following
databases:
Date Experiment
==== ==========
99NOV02 CORE-A074
99NOV02 NEOS-A340
99NOV09 NEOS-A341
99NOV16 NEOS-A342
99NOV30 NEOS-A344
99DEC14 NEOS-A346
99DEC21 NEOS-A347
99DEC28 NEOS-A348
Procedures
==========
Please generate the procedures for this session using drudg.
Correlation
==========
This experiment will be correlated at the Haystack Correlator with all
baselines being correlated.
SKED Summary from file ./cb701.skd for experiment CB701
(all scans with at least one subnet station)
SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl
0003-066I x x xx x x x x x x I 10 28 3.5
0048-097I x x x x x I 5 9 1.2
0059+581I x x x x x x x x xI 9 74 3.8
0104-408I x x I 2 2 3.0
0106+013I x x x x x x x x xx xx I 12 55 5.9
0119+115I x xx x x x x x xx x xI 12 25 2.1
0119+041I x x I 2 4 .4
0208-512I I 0 0 .0
0229+131I I 0 0 .0
0235+164I I 0 0 .0
CTA26 I x x x x xx x x x x I 10 27 3.0
0402-362I x I 1 1 .5
0454-234I x x x x x xx x x I 9 15 3.5
0458-020I xx x x x xxI 7 16 1.8
0530-727I I 0 0 .0
0528+134Ix x x x xxxx xxxx xxx x x xx x x x I 22 74 6.5
0537-441I I 0 0 .0
0552+398I x x xx x x xx xx xx xxx xx xx x xx xx x xx x xI 29 292 18.7
0556+238I x xx x x xx x x x x x I 12 41 3.3
0637-752I I 0 0 .0
0718+793I x x x x x x x x I 8 48 2.3
0727-115I x x x x x x xx x I 9 24 3.4
0749+540Ixx x x x x x x x x xx x x x x I 16 169 9.2
0804+499I x x I 2 12 .7
0805+410I x x x x xI 5 27 1.8
0823+033Ix x x x xxx xx x x x x x xx I 16 37 3.9
OJ287 I xx x xx xx x x x x x xI 13 53 4.4
0919-260I I 0 0 .0
0920-397I I 0 0 .0
4C39.25 Ix x x x xx xx xx xx x x x x x x x x xI 21 198 12.6
OK290 I xx x x xx x x xI 9 22 1.7
0955+476I x x x x x x x x x x I 10 84 4.8
1034-293I x x x I 3 3 1.0
1044+719I x x x x x x x x x x I 10 121 5.8
1053+815I x x x x x x x I 7 55 2.9
1057-797I I 0 0 .0
1104-445I I 0 0 .0
1124-186I x x x I 3 7 1.1
1128+385I x x x x x x I 6 33 2.4
1144-379I x I 1 1 .6
1219+044I xx xx xxx x xx x x x x I 14 53 5.5
1255-316I x x I 2 2 .7
1300+580I x x x x x x x I 7 51 2.6
1334-127I xx x x x x x x x I 9 15 2.1
1351-018I x x x x x x x I 7 18 5.5
1357+769I x x x x x x x x x I 9 121 6.5
1424-418I I 0 0 .0
1451-375I x I 1 1 .6
1606+106I x x x xx x xx x xx x x x xxx x x x I 20 67 6.3
1622-253I x x x x xxx I 7 11 2.8
NRAO512 Ix x x x x x xx x x x I 11 56 3.7
1726+455I x x x x x x x x I 8 26 1.6
1739+522I x I 1 6 .3
1741-038I x x x xxx xx xxxx x x x I 15 35 4.0
1749+096Ix x x xx xx x x x x I 11 78 7.4
1815-553I I 0 0 .0
1908-201I x x xx xxx x x x I 10 22 3.5
1954-388I x x x I 3 3 2.0
1958-179I x x I 2 4 .6
2005-489I I 0 0 .0
2052-474I I 0 0 .0
2121+053I I 0 0 .0
2128-123I I 0 0 .0
2134+00 I I 0 0 .0
2145+067I I 0 0 .0
2255-282I I 0 0 .0
Total scans, obs: 418 2126
Average number of obs. per baseline per source (normalized by up-time) = 3.2
Min = .0 Max = 75.8 (Baseline Ny-Ts on 1351-018) RMS = 5.4
Total time: 1430 minutes ( 23.8 hours).
Key: Ap=ALGOPARK Yk=ARIES_9M Sm=CRIMEA 65=DSS65 Ft=FORTLEZA
Ny=NYALES20 Ts=TSUKUB32
Ap Yk Sm 65 Ft Ny Ts Avg
% obs. time: 22 23 22 25 16 36 27 25
% cal. time: 2 1 1 3 1 3 2 2
% slew time: 56 18 24 44 22 13 10 27
% idle time: 18 56 51 26 59 46 59 45
# of tapes : 1.4 1.4 1.4 .5 1.0 .6 .5
total # scans: 242 148 162 273 139 267 218 207
# scans/hour : 10 6 6 11 5 11 9 8.6
Avg scan (sec): 79 134 121 81 104 117 107 106
# OF OBSERVATIONS BY BASELINE
| Ap Yk Sm 65 Ft Ny Ts StnTotal
------------------------------------------
Ap|242 85 94 171 98 166 99 713
Yk| 148 44 67 27 91 118 432
Sm| 162 150 49 142 77 556
65| 273 108 205 113 814
Ft| 139 45 10 337
Ny| 267 167 816
Ts| 218 584
Number of 2-station scans: 123
Number of 3-station scans: 104
Number of 4-station scans: 99
Number of 5-station scans: 59
Number of 6-station scans: 31
Number of 7-station scans: 2
Total # of scans, observations: 418 2126
Average baseline components for all observations
Average XY = 5400.
Average XZ = 4358.
Average YZ = 4280.
Average length = 5942.