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1212 Francette

Hildian asteroid

Field	Value
minorplanet	yes
name	1212 Francette
background	#D6D6D6
discovery_ref
discoverer	L. Boyer
discovery_site	Algiers Obs.
discovered	3 December 1931
mpc_name	(1212) Francette
alt_names	1931 XC
1949 HZ1965 JB
A918 KA
named_after	Francette Boyer
(discoverer's wife)
mp_category	main-belt(outer)
Hilda
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	85.98 yr (31,406 days)
aphelion	4.7109 AU
perihelion	3.1972 AU
semimajor	3.9541 AU
eccentricity	0.1914
period	7.86 yr (2,872 days)
mean_anomaly	282.89°
mean_motion	/ day
inclination	7.5898°
asc_node	149.58°
arg_peri	348.23°
jupiter_moid	0.3433 AU
dimensions	km
km
km
rotation	h (poor)
h
albedo

spectral_type	Tholen PP
SMASS X
B–V 0.693
U–B 0.215
abs_magnitude	9.54

1949 HZ1965 JB A918 KA (discoverer's wife) Hilda km km h

SMASS X B–V 0.693 U–B 0.215

1212 Francette (provisional designation ****) is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 82 kilometers in diameter. It was discovered on 3 December 1931, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa, who named it after his wife Francette Boyer.

Orbit and classification

Francette is the second largest member of the small Hilda family (001), an asteroid family within the dynamical Hilda group, that stays in an orbital resonance with the gas giant Jupiter. It orbits the Sun in the outermost asteroid belt at a distance of 3.2–4.7 AU once every 7 years and 10 months (2,872 days; semi-major axis of 3.95 AU). Its orbit has an eccentricity of 0.19 and an inclination of 8° with respect to the ecliptic.

The asteroid was first observed as at Simeiz Observatory in May 1918. The body's observation arc begins at Algiers with its official discovery observation.

Physical characteristics

In the Tholen classification, Francette is a primitive P-type asteroid. In the SMASS classification it is an X-type asteroid. The Wide-field Infrared Survey Explorer (WISE) also characterizes Francette as a dark P-type, while the overall spectral type for members of the Hilda family is typically that of a carbonaceous C-type.

Rotation period

In July 2016, a rotational lightcurve of Francette was obtained from photometric observations by American astronomers Brian Warner, Robert Stephens and Dan Coley at the Center for Solar System Studies (U80–82) in California. Lightcurve analysis gave a rotation period of 22.433 hours with a brightness variation of 0.13 magnitude (), superseding a period of 16 hours, previously measured in the 1970s.

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Francette measures between 76.395 and 85.81 kilometers in diameter and its surface has an albedo between 0.037 and 0.046.

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0400 and a diameter of 82.13 kilometers based on an absolute magnitude of 9.54.

Naming

This minor planet was named by the discoverer after his wife, Francette Boyer. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 112).

Notes

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

hilda-asteroids discoveries-by-louis-boyer-(astronomer) named-minor-planets p-type-asteroids-(tholen) x-type-asteroids-(smass) astronomical-objects-discovered-in-1931

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