Notes.
An asterisk (*) between the asteroid number and name
denotes a new or significantly changed entry (data have been changed
over three units of the last decimals or have been added) as
compared with the lightcurve parameters table published last year.
Also asterisk marks entries where the reliability code has been changed
or new symbol A or B or T has been added (or eliminated).
In column “Period” the rotation period expressed
in hours is given. The value quoted is the most reliable of the
individual values reported, or a subjective “best estimate” based
on sometimes discordant results. In column “Variation” the
amplitude of variation or range of amplitude observed at all
aspects is given (some adjustments have been made to estimate
the amplitude which would have been observed at low phase angle
at the same aspect). In column “Note” a reliability code is given
as follows:
Very tentative result, may be completely wrong.
Reasonably secure result, based on over half coverage of
the lightcurve.
Secure result, full lightcurve coverage, no ambiguity of
period.
Multiple apparition coverage, pole position reported.
A blank reliability code implies incomplete or inconclusive result.
Following the reliability code is a space for remarks, with the
following meanings.
Number of extrema per rotation cycle
(e.g., 1, 3). Unless otherwise noted, two per cycle is assumed.
Ambiguous period. The “most likely”
period is listed, with other possibilities listed in a footnote ordered
by asteroid number, below.
Suspected binary object, based on a second
periodicity in the lightcurve data (see footnote).
Rotation period “determined”
from published data, but not given by author(s) of original data.
- No lightcurve published.
- Photographic photometry.
- “Tumbling”, that is, non-principal axis rotation motion.
- Visual photometry.
- Radar observation.
Footnotes and alternative values for ambiguous periods
- A P=13.13 or 6.668 hours
- A P=26.56 hours
- B synchronous, equal diameters
- A P=14.46 hours
- A P=10.9 hours
- A P=42.62 hours
- T P=250 hours
- A P=12 hours
- A P=10.1 hours
- A P= 4.35 or 8.03 hours
- A P= 8.67 hours
- A P=19.35 hours
- A P=16.804 hours
- A P=38.4 hours
- A P= 2.9 hours
- A P=12.0 hours
- A P= 6.78 hours
- B synchronous, 10.6 km and 7.4 km in diameter
B? a modulation of P=7.90 h., ampl.=0.15 mag. was observed near
minimum light of the longer period variation. Binzel [1] interprets
this as the real rotation period, with the long period
being a precession period caused by unseen satellite
- B synchronous, equal diameters
- B 2.7 km in diameter, separation = 140 km; adaptive optics
- A P=16.45 hours
- A P= 8.86 hours
- A P=10.3 hours
- A P= 5.5 hours
- A P= 3.862 hours
- A P= 6.65 hours
B P=27.72 h., ampl. = 0.08 mag.
Binary based on apparent eclipse events in the lightcurve with a period (secondary
orbital?) of the longer value given [2]
- B P=36.57 h., ampl.=0.3 mag.
- T P1=176 hours, P2=130 hours
- B synchronous, equal diameters
- A P=12 hours
B? P= 6.760 h., ampl. = 0.08 mag.
Suspected binary based on apparent eclipse events in the lightcurve with a period
(secondary orbital?) of the longer value given [3]
- A P= 2.919 hours
- A P= 3.638 hours
- A P= 7.69 or 11.9 hours
- A P= 3.638 hours
- B 2 km in diameter, separation = 230 km; HST
B? P= 7.003 h., ampl. = 0.09 mag.
Suspected binary based on a second periodicity in the lightcurve data
with a period (secondary orbital?) of the longer value given [3]
- A P= 9.8 hours
- B P=32.69 h., ampl.=0.18 mag. [4]
- T P=52.79 hours
- B P=11.9 h., ampl.=0.08 mag.
- B P=14.53 h., ampl.=0.2 mag.
- B P=17.45 h., ampl.=0.34 mag.
- B synchronous, 0.63 km and 0.57 km in diameter
- A P=10.22 hours
- A P=19.34 hours
- B P=17.72 h., ampl.=0.2 mag., 0.42 km and 0.20 km in diameter
- A P=122.3 hours
- B P=16.40 h., ampl.=0.14 mag.
References:
R. P. Binzel// A photoelectric survey of 130 asteroids.
Icarus, 1987. V. 72, P. 135–208
- IAUC 6680, 1997
Pravec P. et al.// Two-period lightcurves of 1996 FG3, 1998 PG
and (5407) 1992 AX: one probable and two possible binary
asteroids. Icarus, 2000. V. 146, P.190–203
Pravec P. et al.// Occultation/eclipse events in binary asteroid
1991 VH. Icarus, 1998. V. 133, P.79–88
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