Petit-Prince (moon)

(45) Eugenia I Petit-Prince is the larger, outer moon of asteroid 45 Eugenia. It was discovered in 1998 by astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii. Initially, it received the provisional designation S/1998 (45) 1. Petit-Prince was the first asteroid moon to be discovered with a ground-based telescope. Previously, the only known moon of an asteroid was Dactyl, discovered by the Galileo space probe, around 243 Ida.

Discovered byW. J. Merline, L. M. Close,
C. Dumas, C. R. Chapman,
F. Roddier, F. Menard,
D. C. Slater, G. Duvert,
J. C. Shelton, T. Morgan
Discovery date1 November 1998
MPC designationS/1998 (45) 1
PronunciationFrench: [pətipʁɛ̃s]
Named after
The Little Prince
Main belt
Orbital characteristics[2]
1184 ± 12 km
Eccentricity0.0100 ± 0.0002
4.766 ± 0.001 d
18.1 m/s
Inclination8.0 ± 0.1°
(with respect to Eugenia equator)
Satellite of45 Eugenia
Physical characteristics
Dimensions~ 13 km (estimate) [3]
Mass~ 1.2×1015 kg (estimate) [4]
Equatorial escape velocity
~ 5 m/s (estimate)
13.6 [5]


    Petit-Prince is 13 km in diameter, compared to 45 Eugenia's 214 km. It takes five days to complete an orbit around Eugenia.


    The discoverers chose the name in honour of Empress Eugénie's son, the Prince Imperial.[6] However, they also intended an allusion to the children's book The Little Prince by Antoine de Saint-Exupéry, which is about a prince who lives on an asteroid.[7]

    In their submission of the name to the IAU, the discovers justified the double meaning by arguing for similarities between the Prince Imperial and the Little Prince:

    "Both princes were young and adventurous, and had little fear of danger. Both were of rather small stature. They both left the confines of their cozy little worlds (asteroid B612 for the Little Prince and Chislehurst for the Prince Imperial). They both then undertook long journeys to end up in Africa, whereupon they both meet rather violent deaths ... And in both cases they lay alone for one night each after "death" and then "returned" back home..."[7]

    See also


    1. IAUC 7129, announcing the discovery
    2. synthesis of several observations Archived 13 September 2006 at the Wayback Machine, F. Marchis.
    3. Assuming the same albedo as Eugenia, then using the difference in absolute magnitude
    4. Assuming same density and albedo as Eugenia
    5. W.J. Merline at al. (1999). "Discovery of a moon orbiting the asteroid 45 Eugenia". Nature. 401 (6753): 565. Bibcode:1999Natur.401..565M. doi:10.1038/44089.
    6. "Solar System Exploration: Asteroids – Moons". National Aeronautics and Space Administration. 2011. Retrieved 18 September 2011.
    7. William J. Merlin; et al. (2000). "On a Permanent Name for Asteroid S/1998(45)1" (TXT). Department of Space Studies, Southwest Research Institute. Retrieved 9 November 2011.
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