(16635) 1993 QO

compiled by Wm. Robert Johnston
last updated 28 November 2008

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 2.2983105 AU
orbital period P: 3.48 y (=1,272.66 d)
eccentricity e: 0.2842122
perihelion distance q: 1.6451026 AU
aphelion distance Q: 2.9515184 AU
inclination i: 21.94747°
argument of perihelion omega: 77.93916°
ascending node OMEGA: 313.85617°
mean anomaly M: 349.16429°
perihelion passage TP: 2007-12-04.31
Epoch: 27 OCT 2007
data arc: 1986-2006 (325 obs.)

orbital data, secondary:
semimajor axis a: (16 km?)
semimajor axis/primary radius a/Rp: (5.5?)
orbital period P: 32.25 ± 0.03 h [C1143]
eccentricity e: ?

other data, primary:
diameter: (6 km?)
absolute magnitude H: 13.9 [JPL]
14.0 ± 0.3 [C1143]
rotation period: 2.2083 ± 0.0002 h [C1143]
amplitude delta M: 0.17 [C08a]
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) assumed
geometric albedo: (0.12) assumed
mass: ?
density: ?
type: ?

other data, secondary:
diameter: (1.5 km?)
diameter ratio Ds/Dp: 0.27 [C1143]
component magnitude difference: (2.8)
rotation period: 7.622 ± 0.002 h [C1143]

--(16635) 1993 QO--discovery and notes:

Primary discovered 20 August 1993 by E. F. Helin from Palomar Obseratory, California, USA; subsequently linked to prediscovery observations from 1986. Alternate designation 1986 QC.

Secondary identified by D. Pray, P. Pravec, P. Kusnirak, K. Hornoch, Yu. Krugly, V. Chiorny, M. Husarik, M. Pikler, J. Vilagi, S. Gajdos, A. Galad, W. Cooney, J. Gross, D. Terrell, N. Gartonyuk, R. Stephens, R. Durkee, F. Marchis, M. Baek, B. Macomber, V. Reddy, F. Colas, J. Lecacheux, and J. Ries based on lightcurve observations from 2 September to 9 November 2007; announced 19 November 2007.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2007, 2008 by Wm. Robert Johnston.
Last modified 28 November 2008.
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