Issue |
A&A
Volume 437, Number 3, July III 2005
|
|
---|---|---|
Page(s) | 1147 - 1150 | |
Section | Celestial mechanics and astrometry | |
DOI | https://doi.org/10.1051/0004-6361:20042387 | |
Published online | 30 June 2005 |
CCD astrometric observations of Amalthea and Thebe
1
Observatório Nacional, Rua General José Cristino 77, 20921-400 Rio de Janeiro, Brazil e-mail: cave@on.br
2
Observatório do Valongo, Ladeira Pedro Antônio 43, 20080-090 Rio de Janeiro, Brazil
3
Institut de Mécanique Céleste et de Calcul des Éphémérides, 77 avenue Denfert Rochereau, 75014 Paris, France
Received:
4
January
2005
Accepted:
14
March
2005
This paper presents the results of observations of Jupiter's
satellites Amalthea and Thebe made in 1995, 1996 and 2001 at the
Laboratório Nacional de Astrofísica (LNA), Brazil. The
observations were made in visible light wavelengths with a 1.6 m
reflector telescope and the light of Jupiter was covered by a mask
placed near the CCD surface. The already published positions for 1995,
whose astrometric reduction used the Galilean satellites, are
now reduced using the stars in the CCD fields like the new positions
of 1996 and 2001. The 2001 data are much better than those obtained
in 1995, and that those from 1996 show large residuals. Considering
the 310 frames observed, the mean residual is about 001 and
the standard deviation is about 0
15.
Key words: astrometry / Jupiter satellites / Amalthea and Thebe
© ESO, 2005
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