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1256 Normannia

Hilda asteroid and slow rotator

Field	Value
minorplanet	yes
name	1256 Normannia
background	#D6D6D6
image	001256-asteroid shape model (1256) Normannia.png
caption	Shape model of Normannia from its lightcurve
discovery_ref
discoverer	K. Reinmuth
discovery_site	Heidelberg Obs.
discovered	8 August 1932
mpc_name	(1256) Normannia
alt_names	1932 PD1930 KO
pronounced
named_after	Normans/Normandy
(people/region in France)
mp_category	main-belt(outer)
Hildabackground
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	87.43 yr (31,933 days)
aphelion	4.1995 AU
perihelion	3.5903 AU
semimajor	3.8949 AU
eccentricity	0.0782
period	7.69 yr (2,808 days)
mean_anomaly	5.5363°
mean_motion	/ day
inclination	4.1732°
asc_node	236.94°
arg_peri	101.06°
dimensions	km
69.02 km (derived)
km
km
rotation	h (poor)
h (poor)
h
(poor) h
h
albedo	0.0364 (derived)

spectral_type	Tholen DD
B–V 0.737
U–B 0.239
abs_magnitude	(R)9.669.7410.02

(people/region in France) Hildabackground 69.02 km (derived) km km h (poor) h (poor) h h

B–V 0.737 U–B 0.239

1256 Normannia (prov. designation: ) is a dark Hilda asteroid and slow rotator from the outermost regions of the asteroid belt, approximately 69 km in diameter. It was discovered on 8 August 1932, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The asteroid was likely named after the Normans who gave their name to the region of Normandy in France.

Orbit and classification

Normannia is a member of the Hilda group of asteroids, which are in 3:2 orbital resonance with the gas-giant Jupiter. When applying the Hierarchical Clustering Method to its proper orbital elements, Normannia is a background asteroid that does not belong to neither the Hilda family (001) nor the Schubart family (002), the only two asteroid families known within the Hilda group.

It orbits the Sun in the outermost asteroid belt at a distance of 3.6–4.2 AU once every 7 years and 8 months (2,808 days; semi-major axis of 3.89 AU). Its orbit has an eccentricity of 0.08 and an inclination of 4° with respect to the ecliptic. The body's observation arc begins with its first identification as at Lowell Observatory in May 1930, more than two years prior to its official discovery observation at Heidelberg.

Naming

This minor planet was probably named after the Normans ("Norseman"), mainly Danish and Norwegian Vikings who settled in the historical region of Normandy in northwestern France. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115).

Physical characteristics

In the Tholen classification, Normannia is a dark D-type asteroid. Observations by Pan-STARRS and by the Wide-field Infrared Survey Explorer (WISE) also characterized the asteroid as a D-type.

Rotation period

In September 2010, a rotational lightcurve of Normannia was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 488.063 hours with a brightness amplitude of 0.39 magnitude (). This makes it one of the Top-100 slow rotators known to exist. Other observations gave several poor lightcurves with a much shorter period between 6.4 and 18.8 hours ().

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, Normannia measures between 68.253 and 73.26 kilometers in diameter and its surface has an albedo between 0.046 and 0.052.

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0364 and a diameter of 69.02 kilometers based on an absolute magnitude of 10.02.

Notes

References

{{OED. Normannic

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-karl-wilhelm-reinmuth named-minor-planets slow-rotating-minor-planets d-type-asteroids-(tholen) astronomical-objects-discovered-in-1932

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