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17246 Christophedumas (provisional designation 2000 GL74) is a stony Koronian asteroid and binary system from the outer regions of the asteroid belt, approximately 4.6 kilometers in diameter.
Discovery[1] | |
---|---|
Discovered by | LINEAR |
Discovery site | Lincoln Lab ETS |
Discovery date | 5 April 2000 |
Designations | |
(17246) Christophedumas | |
Pronunciation | /kriːstɔːf djuːˈmɑː/[2] |
Named after | Christophe Dumas (planetary scientist)[3] |
2000 GL74 · 1973 VM | |
main-belt · Koronis[4][5] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 45.84 yr (16,742 days) |
Aphelion | 2.9023 AU |
Perihelion | 2.7772 AU |
2.8398 AU | |
Eccentricity | 0.0220 |
4.79 yr (1,748 days) | |
180.58° | |
0° 12m 21.6s / day | |
Inclination | 2.4444° |
34.451° | |
229.77° | |
Known satellites | 1[5][6][lower-alpha 1] |
Physical characteristics | |
Dimensions | 4.5 km[7] 4.81 km (calculated)[4] |
10 h[8] | |
0.21[5] | |
S[4] | |
13.9[1][4] | |
It was discovered on 5 April 2000, by the LINEAR program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, United States.[3] It was named after planetary scientist Christophe Dumas. The asteroid's minor-planet moon was discovered in 2004.[5]
Christophedumas is a member of the Koronis family, which is named after 158 Koronis. It orbits the Sun in the outer main-belt at a distance of 2.8–2.9 AU once every 4 years and 9 months (1,748 days). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic.[1] The asteroid's observation arc begins 29 years prior to its official discovery observation, with a precovery taken at Palomar Observatory in April 1971.[3]
On 9 January 2129, Christophedumas will come within 3,639,998 kilometers of 3 Juno, one of the largest asteroids in the main-belt, and will pass it with a relative velocity of 6.597 km/s.[1]
Christophedumas is a presumed stony S-type asteroid. With an albedo of 0.21, it is more reflective than most asteroids in the outer main-belt.[5] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.21 and calculates a diameter of 4.81 kilometers based on an absolute magnitude of 13.9.[4]
In December 2007, a rotational lightcurve of Christophedumas was obtained from photometric observations by Israeli astronomer David Polishook and colleagues. Lightcurve analysis gave a rotation period of 10 hours with a brightness amplitude of 0.15 magnitude (U=n.a.).[8] The team of astronomers also ruled out that Christophedumas might be an Escaping Ejecta Binary (EEB), that are thought to be created by fragments ejected from a disruptive impact event.[8]
In 2004, a minor-planet moon, designated S/2004 (17246) 1, was discovered orbiting its primary, making Christophedumas a binary asteroid.[5][lower-alpha 1] With a secondary-to-primary mean-diameter ratio of 0.22, the moon measures approximately 1 kilometer in diameter, based on a diameter of 4.5 kilometers for its primary.[7] While its rotation period and orbital eccentricity is not yet known, it is known that the moon completes one orbit every 90 days (2034 hours) with a semi-major axis of 228 kilometers.[6][7]
From the surface of Christophedumas, the moon would have an apparent diameter of about 0.668°, slightly larger than the Moon appears from Earth.[lower-alpha 2]
This minor planet was named after planetary scientist Christophe Dumas (born 1968), an observer of Solar System objects and expert in using adaptive optics. Dumas is a co-discoverer of the first asteroid moon imaged from Earth.[3] The approved naming citation was published by the Minor Planet Center on 20 June 2016 (M.P.C. 100606).[9][10]
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