Issue |
Astron. Astrophys. Suppl. Ser.
Volume 140, Number 1, November II 1999
|
|
---|---|---|
Page(s) | 21 - 28 | |
DOI | https://doi.org/10.1051/aas:1999115 | |
Published online | 15 November 1999 |
CCD photometry and new models of 5 minor planets
1
Department of Experimental Physics & Astronomical Observatory, JATE University, H-6720 Szeged, Dóm tér 9., Hungary
2
Guest Observer at Konkoly Observatory, Hungary
3
Department of Physical Geography, ELTE University, H-1088 Budapest, Ludovika tér 2., Hungary
Received:
28
June
1999
Accepted:
6
September
1999
We present new R filtered CCD observations of 5 faint and moderately
faint asteroids carried out between October, 1998 and January, 1999.
The achieved accuracy is between 0.01-0.03 mag, depending mainly
on the target brightness.
The obtained sinodic periods and amplitudes:
683 Lanzia – , 0.13 mag; 725 Amanda –
,
≥0.40 mag;
852 Wladilena –
, 0.32 mag (December, 1998) and 0.27 mag
(January, 1999); 1627 Ivar –
,
0.77 mag (December, 1998) and 0.92 mag (January, 1999).
The Near Earth Object 1998 PG unambiguously showed doubly-periodic
lightcurve, suggesting the possibility of a relatively fast
precession (
,
).
Collecting all data from the literature, we determined new models
for 3 minor planets. The resulting spin vectors and
triaxial ellipsoids have been calculated by an amplitude-method.
Sidereal periods and senses of rotation were calculated
for two asteroids (683 and 1627) by a modified epoch-method.
The results are:
,
,
,
,
= 0
1964156 ± 0
0000001, retrograde;
,
,
,
;
,
,
,
,
= 0
1999154 ± 0
0000003, retrograde.
The obtained shape of 1627 is in good agreement with
radar images by [Ostro et al. (1990)].
Key words: solar system: general minor planets
© European Southern Observatory (ESO), 1999