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J/AJ/109/1352 Stellar occultation candidates (McDonald+ 1995)
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Triton stellar occultation candidates: 1995-1999
McDonald S.W., Elliot J.L.
<Astron. J. 109, 1352 (1995)>
=1995AJ....109.1352M (SIMBAD/NED BibCode)
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ADC_Keywords: Occultations ; Positional data
Abstract:
We have completed a search for candidates for stellar occultations by
Triton over the years 1995-1999 CCD strip scan images provided star
positions in the relevant sky area to a depth of about 17.5Rmag. Over
this time period, we find that Triton passes within 1.0arcsec of 75
stars. Appulses with geocentric minimum separations of less than
0.35arcsec will result in stellar occultations, but further astrometry
and photometry is necessary to refine individual predictions for
identification of actual occultations. Finder charts are included to
aid in further studies and prediction refinement. The two most
promising potential occultations, Tr176 and Tr180, occur in 1997.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 95 75 Possible occultations by Triton
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See also:
J/AJ/104/862 : Stellar occultation candidates (McDonald+ 1992)
Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 5 A5 --- ID Star name
7- 14 A8 "DD/MM/YY" AppDate Date of the closest approach
16- 17 I2 h Apph UT time of the closest approach
19- 20 I2 min Appm UT time of the closest approach
22- 25 F4.2 arcsec SepMin Minimum separation of the closest approach
27- 29 I3 deg PA Position angle of Triton relative to the
star at the time of the closest approach
(North to East)
31- 34 F4.1 mag Rmag CCD magnitude
36- 39 F4.1 km/s Vel Velocity of the occultation shadow
41 A1 --- l_S/N Limit flag on S/N
42- 44 I3 --- S/N Signal to noise ratio (1)
46- 48 I3 deg Dist Angular distance between Triton and the Sun
50- 51 I2 h RAh Right ascension (J2000) of the star
53- 54 I2 min RAm Right ascension (J2000) of the star
56- 61 F6.3 s RAs Right ascension (J2000) of the star
63 A1 --- DE- Declination sign
64- 65 I2 deg DEd Declination (J2000) of the star
67- 68 I2 arcmin DEm Declination (J2000) of the star
70- 74 F5.2 arcsec DEs Declination (J2000) of the star
76- 79 I4 deg Elon [-179/155] Sub_Earth longitude of the star
at the mid-time of the event
81- 95 A15 --- Strip Strip numbers on which an image of the
candidate star was measured
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Note (1): The S/N for the light curve has been calculated for an averaging
interval of 20km (the approximate scale height of Triton's
atmosphere), based on the S/N of 30.3 achieved for Tr60 by Elliot
et al. (1993BAAS...25.1106E) with the 0.9m KAO telescope with a CCD
photometer (no filter). Background limited performance has been
assumed, which may lead to an overestimate of S/N for the brightest
sources. Potential observers should evaluate the S/N for their own
photometric equipment.
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 01-Apr-1997