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1939 Loretta

Carbonaceous main-belt asteroid

Field	Value
minorplanet	yes
name	1939 Loretta
background	#D6D6D6
discovery_ref
discovered	17 October 1974
discoverer	C. Kowal
discovery_site	Palomar Obs.
mpc_name	(1939) Loretta
alt_names	1974 UC1934 JE
1934 LQ1939 EH
1939 GP1950 DT
1950 ES1951 MF
1955 CA
1975 XW
named_after	Loretta Kowal
(daughter of discoverer)
mp_category	main-beltThemistian
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	67.21 yr (24,547 days)
aphelion	3.5154 AU
perihelion	2.7291 AU
semimajor	3.1222 AU
eccentricity	0.1259
period	5.52 yr (2,015 days)
mean_anomaly	24.968°
mean_motion	/ day
inclination	0.9058°
asc_node	40.473°
arg_peri	189.36°
dimensions	km
km
29.83 km (derived)
km

rotation	h
albedo	0.0721 (derived)

spectral_type	C
abs_magnitude	10.811.011.1

1934 LQ1939 EH 1939 GP1950 DT 1950 ES1951 MF 1955 CA 1975 XW (daughter of discoverer) km 29.83 km (derived) km

1939 Loretta, provisional designation , is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 17 October 1974, by American astronomer Charles Kowal at Palomar Observatory in California, who named it after his daughter, Loretta Kowal. The discovery of the asteroid took place during Kowal's follow-up observations of Jupiter's moon Leda, which he had discovered one month prior.

Orbit and classification

Loretta is a member of the Themis family, a dynamical family of main-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.5 AU once every 5 years and 6 months (2,015 days). Its orbit has an eccentricity of 0.13 and an inclination of 1° with respect to the ecliptic.

First identified as at the South African Johannesburg Observatory, Lorettas first used observation was made at the Finnish Turku Observatory in 1939, extending the body's observation arc by 35 years prior to its discovery.

Physical characteristics

Loretta has been characterized as a carbonaceous C-type asteroid.

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Loretta measures between 26.3 and 30.4 kilometers in diameter, and its surface has an albedo between 0.092 and 0.101. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.072 and a diameter of 29.8 kilometers with an absolute magnitude of 11.1.

Rotation period

A fragmentary rotational lightcurve of Loretta was obtained from photometric observations made by French amateur astronomer Pierre Antonini in March 2011. It gave an approximate rotation period of 25 hours with a brightness variation of 0.12 magnitude ().

Naming

This minor planet was named by the discoverer after his daughter, Loretta Kowal. The official was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3828).

References

Kowal, C. T.. (1974). "Thirteenth satellite of Jupiter". Astronomical Journal.

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.

themis-asteroids discoveries-by-charles-t.-kowal named-minor-planets astronomical-objects-discovered-in-1974

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