(148780) Altjira

(148780) Altjira
compiled by Wm. Robert Johnston
last updated 23 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:	44.0728 AU
orbital period P:	292.59 y (=106,869.8 d)
eccentricity e:	0.063409
perihelion distance q:	41.2782 AU
aphelion distance Q:	46.8675 AU
inclination i:	5.20273°
argument of perihelion omega:	296.18°
ascending node OMEGA:	1.904°
mean anomaly M:	114.93°
perihelion passage TP:	1913-11-10.8
Epoch:	10 APR 2007
data arc:	2001-2006 (37 obs.)

orbital data, secondary:

semimajor axis a: (5,800 km separation?) [N07a]
semimajor axis/primary radius a/Rp: ?
orbital period P: (23 d?)
eccentricity e: ?

other data, primary:

diameter:	(340 km?)
absolute magnitude H:	5.44 ± 1.57 [JPL] 5.1 [N07a]
rotation period:	?
amplitude delta M:	?
color index B-V:	?
color index V-R:	?
color index B-R:	1.65
color index R-I:	?
slope parameter G:	(0.15) assumed
geometric albedo:	(0.09) assumed
mass:	?
density:	?
type:	?

other data, secondary:

diameter: (246 km?)
diameter ratio Ds/Dp: (0.72)
component magnitude difference: 0.7 ± 0.2 [N07a]
rotation period: ?

--(148780) Altjira--discovery and notes:

Primary discovered 20 October 2001 by M. W. Buie at Kitt Peak, United States. Alternate designation 2001 UQ18.

Companion reported March 2007.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

Noll, Keith S., Grundy, William M., Chiang, Eugene I., Margot, Jean-Luc, & Kern, Susan D. 2007, ArXiv Astrophysics e-prints Binaries in the Kuiper Belt
Sheppard, Scott S. 2007, ArXiv e-prints Light Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions and Absolute Magnitudes
Elliot, J. L., Kern, S. D., Washburn, K. E., Buie, M. W., Wasserman, L. H., Millis, R. L., & Marsden, B. G. 2001, Minor Planet Electronic Circulars 2001 UN18,

© 2007, 2008 by Wm. Robert Johnston.
Last modified 23 November 2008.
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