Session Notes for rd2004
PI: Patrick Charlot, Bordeaux Observatory
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PURPOSE AND GENERAL NOTES
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GAIA proposal
The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted in 2012 a proposal to
observe 195 ICRF2 transfer sources in the context of the GAIA mission. These sources
were added to the GSFC monitoring program and 37 sources were scheduled in Gaia-dedicated
R&D sessions.
In February 2017, we studied the position uncertainties and the observation frequency
of the 195 sources of the LAB proposal. Twenty-seven of these sources have a bad
observation frequency: they were observed successfully in less than five sessions a year
while the LAB requirement was twelve sessions a year. Most of these sources have
bad uncertainties compared to the other sources of the set (larger than 50 microas).
Three additional sources have good position uncertainties and an observation frequency of
five to eleven successful sessions a year. However they are sources that were observed in
previous Gaia-dedicated R&D sessions and the concern is that if they are not scheduled in
coming dedicated R&D sessions, their observation frequency may drop.
The sources scheduled in the Gaia-dedicated R&D sessions scheduled to observe after
March 1st, 2017 are these thirty sources.
When compared to the previous categories determined by the LAB, one source was in
category 1, five sources were in category 2, five sources were in category 3 and
nineteen sources were in category 4.
In RD2004, we schedule 29 out of the thirty sources in the astro mode of sked. We use a
maxscan value of 600 seconds. We use the sked flux catalog for all sources.
The command fill is used with an offset of 10 seconds.
We use a modified version of the 1Gbps wide-band mode currently used to schedule AOV sessions.
Ny-Alesund will observe INT I20127 during the time from 1815 UT to 1945 UT.
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----- Parameter listing --------------------------------------
Experiment: RD2004 Description R&D-05/2020
Scheduler: NASA Correlator: SHAO
Start: 2020-127-18:00:00 End: 2020-128-18:00:00
Current yyyyddd: 2020127 (2020.35) ( 18976 MJD, WED. 6MAY.)
Greenwich sidereal time: 09:00:12 (18:00:00 UT)
Sun's RA and DEC: 2h 56.8m 16d 48.9
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First observations
Observation listing from file ./rd2004.skd for experiment RD2004
Source Start DURATIONS
name yyddd-hhmmss Ft Hh Ho Km Ny On Wz
1149-084 20127-180000| 67 40 42 40 67|
0955+476 20127-180215| 40 40 42 42|
1144-379 20127-180301| 161 126 161 |
3C418 20127-180441| 40 149 117 149|
0823-223 20127-180826| 103 150 118 150|
1349-439 20127-180858| 49 49 |
1330+476 20127-181157| 201 183 175 201|
0131-522 20127-181253| 40 40 |
End of listing.
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Last observations
Observation listing from file ./rd2004.skd for experiment RD2004
Source Start DURATIONS
name yyddd-hhmmss Ft Hh Ho Km Ny On Wz
0241+622 20128-173837| 436 475 475 |
1251-197 20128-173905| 568 600 600 600|
0322+222 20128-174743| 129 107 129 |
1333-337 20128-175022| 354 354 135 |
1330+476 20128-175135| 248 248 133|
1125+366 20128-175423| 124 124|
0955+476 20128-175658| 40 40 40 40|
1519-273 20128-175833| 77 77 77 |
0059+581 20128-175912| 38 38 38|
End of listing.
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SKED Summary from file ./rd2004.skd for experiment RD2004
(all scans with at least one subnet station)
Average number of obs. per baseline per source(normalized by up-time) = 6.6
Min = 0.0 Max = 102.9 (Baseline Ho-On on 0823-223) RMS = 9.2
Total time: 1440 minutes ( 24.0 hours).
Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Km=KUNMING Ny=NYALES20
On=ONSALA60 Wz=WETTZELL
Ft Hh Ho Km Ny On Wz Avg
% obs. time: 39 57 59 60 67 58 72 59
% cal. time: 2 2 2 3 2 2 3 2
% slew time: 27 34 26 27 11 14 7 21
% idle time: 30 6 12 10 19 25 18 18
total # scans: 159 151 163 229 179 201 218 185
# scans/hour : 7 6 7 10 7 8 9 8
Avg scan (sec): 214 329 310 227 322 248 287 276
# data tracks: 32 32 32 32 32 32 32
# Mk5 tracks: 32 32 32 32 32 32 32
Total TB(M5): 4.36 6.36 6.48 6.66 7.37 6.39 8.00 6.51
# OF OBSERVATIONS BY BASELINE
| Ft Hh Ho Km Ny On Wz Total
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Ft| 47 36 19 47 94 75 318
Hh| 78 84 28 30 60 327
Ho| 120 25 7 18 284
Km| 88 67 97 475
Ny| 130 136 454
On| 147 475
Wz| 533
Number of 2-station scans: 156
Number of 3-station scans: 181
Number of 4-station scans: 84
Number of 5-station scans: 17
Number of 6-station scans: 4
Number of 7-station scans: 0
Total number of scans: 442
Total number of obs: 1433
Total integrated obs-time: 373073
Average obs-time: 260.3
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: | 383| 64| 99| 95| 70| 57| 33| 39| 49| 41| 30| 28| 53| 26| 36| 30| 27| 33| 240|
Average X-band SNRs by baseline
| Ft Hh Ho Km Ny On Wz AVG
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Ft| 35 30 68 81 54 75 58
Hh| 35 51 47 49 63 47
Ho| 51 33 66 31 42
Km| 116 106 117 85
Ny| 133 164 123
On| 159 115
Wz| 126
Average S-band SNRs by baseline
| Ft Hh Ho Km Ny On Wz AVG
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Ft| 22 20 35 34 26 34 28
Hh| 22 33 24 30 31 27
Ho| 31 17 20 20 25
Km| 51 51 52 42
Ny| 47 53 45
On| 52 44
Wz| 47
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Recording mode
Name Code
AOVSX16W SX
Recording mode for: FORTLEZA
Mode Tot.Rate Tot.BandW #BBC #bits Barrel
Mk341:2 1024 Mbits 128 MHz 14 2 NONE
Chan.BW #Subpasses Tracks(*fan) Tot.tracks
16.00 MHz 1 16(*2) 32
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 HOBART26 KUNMING NYALES20 ONSALA60 WETTZELL
Mode Tot.Rate Tot.BandW #BBC #bits Barrel
Mk341:1 1024 Mbits 256 MHz 14 2 NONE
Chan.BW #Subpasses Tracks(*fan) Tot.tracks
16.00 MHz 1 32(*1) 32
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
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Tape types
ID Station Tape length Density Passes
Ft FORTLEZA Mark5A
Hh HARTRAO Mark5B
Ho HOBART26 Mark5B
Km KUNMING Mark5B
Ny NYALES20 Mark5B
On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14
Wz WETTZELL Mark5B
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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 Ho Km Ny On Ft Hh Ho Km Ny On
Hh 20 Hh 15
Ho 20 20 Ho 15 15
Km 20 20 20 Km 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
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