(939) Isberga

compiled by Wm. Robert Johnston
last updated 25 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: 2.2471115 AU
orbital period P: 3.37 y (=1,230.37 d)
eccentricity e: 0.1769515
perihelion distance q: 1.8494817 AU
aphelion distance Q: 2.6447413 AU
inclination i: 2.58829°
argument of perihelion omega: 5.87823°
ascending node OMEGA: 327.23344°
mean anomaly M: 332.71115°
perihelion passage TP: 2008-01-28.26
Epoch: 27 OCT 2007
data arc: 1920-2003 (521 obs.)

orbital data, secondary:
semimajor axis a: (35 km?)
semimajor axis/primary radius a/Rp: (6?)
orbital period P: 26.8 ± 0.1 h [M07a]
eccentricity e: ?

other data, primary:
diameter: (~11 km)
absolute magnitude H: 12.14 [JPL]
rotation period: 2.9173 ± 0.0003 h [M07a]
amplitude delta M: 0.25; 0.15 [M07a]
color index U-B: 0.54 ± 0.02 [JPL]
color index B-V: 0.93 ± 0.02 [JPL]
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) assumed
geometric albedo: (0.20) assumed
mass: ?
density: ?
type: S [JPL]

other data, secondary:
diameter: ?
diameter ratio Ds/Dp: ?
component magnitude difference: ?
rotation period: ?

--(939) Isberga--discovery and notes:

Primary discovered 4 October 1920 by K. Reinmuth at Heidelberg. Alternate designations 1920 HR, 1930 QP, 1957 QE, and 1957 UU.

Secondary identified by Lawrence A. Molnar, Melissa J. Haegert, Christopher N. Beaumont, Marjorie J. Block, Timothy H. Brom, Andrew R.Butler, Peter L. Cook, Allyson G. Green, Joshua P. Holtrop,Kathleen M. Hoogeboom, Jason J. Kulisek, Jonathan S. Lovelace, Jeffery S. Olivero, Achyut Shrestha, Jessie F. Taylor, Kenneth D.Todd, John D. Vander Heide, and Samuel O. Van Scoter, based on lightcurve observations from 26 February-4 March 2006.

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 25 November 2008.
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