(45) Eugenia, Petit-Prince, and S/2004 (45) 1

compiled by Wm. Robert Johnston
last updated 3 November 2012

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: 2.7201828416453 AU
orbital period P: 4.4865 y (=1638.7 d)
eccentricity e: 0.0821997415915194
perihelion distance q: 2.49658451498037 AU
aphelion distance Q: 2.94378117 AU
inclination i: 6.60985681622563°
argument of perihelion omega: 85.1432692310302°
ascending node OMEGA: 147.939965512827°
mean anomaly M: 23.2709349995467°
perihelion passage TP: 2005-05-04.0729435
Epoch: 18 AUG 2005
data arc: 1866-2005 (1243 obs.)

orbital data, Petit-Prince:
semimajor axis a: 1184 ± 12 km [MAb]
semimajor axis/primary radius a/Rp: (11)
orbital period P: 4.766 ± 0.001 d [MAb]
eccentricity e: 0.010 ± 0.0002 [MAb]
inclination i: 8.0° ± 0.1° [MAb]

orbital data, S/2004 (45) 1:
semimajor axis a: (700 km?) [I8817]
semimajor axis/primary radius a/Rp: (7?)
orbital period P: (2 d?)
eccentricity e: ?
inclination i: ?

other data, primary:
diameter: 214.6 ± 4.2 km [IR]
triaxial ratios a/b, b/c: 1.36, 1.4? [SBb]
absolute magnitude H: 7.46 [JPL]
rotation period: 0.2374647 d (=5.69915 h) [SBb]
amplitude delta M: 0.08-0.41 [MPb]
color index U-B: 0.274 ± 0.030 [SBa]
color index B-V: 0.676 ± 0.018 [SBa]
color index V-R: ?
color index R-I: ?
slope parameter G: 0.07 [SBc]
geometric albedo: 0.040 ± 0.002 [IR]
mass: 5.8x1018 kg [MAb]
density: 1.12 ± 0.3 g/cm3 [MAb]
type: FC [SBd]

other data, Petit-Prince:
diameter: (12.7 ± 0.8 km)
diameter ratio Ds/Dp: (0.059)
component magnitude difference: 6.14 ± 0.1 [M99a]
rotation period: ?

other data, S/2004 (45) 1:
diameter: 6 km? [I8817]
diameter ratio Ds/Dp: (0.03?)
component magnitude difference: (8?)
rotation period: ?

--(45) Eugenia--discovery and notes:

Primary discovered 27 June 1857 from Paris, France, by H. Goldschmidt. Alternate designation 1941 BN.

Petit-Prince discovered 1 November 1998 by W. J. Merline, L. M. Close, C. Dumas, C. R. Chapman, F. Roddier, F. Menard, D. C. Slater, G. Duvert, J. C. Shelton, and T. Morgan at the Canada-France-Hawaii Telescope at Mauna Kea, Hawaii; announced 20 March 1999. In (October) 2000 the companion was permanently designated (45) Eugenia I (Petit-Prince).

S/2004 (45) 1 discovered 14 February 2004 by F. Marchis, M. Baek, P. Descamps, J. Berthier, D. Hestroffer, and F. Vachier using the adaptive optics Very Large Telescope YEPUN; announced 7 March 2007. It has been nicknamed "Princesse".

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

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2001-2008, 2012 by Wm. Robert Johnston.
Last modified 3 November 2012.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.