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1080 Orchis

Main-belt asteroid

Field	Value
minorplanet	yes
name	1080 Orchis
background	#D6D6D6
image	001080-asteroid shape model (1080) Orchis.png
caption	Modelled shape of Orchis from its lightcurve
discovery_ref
discoverer	K. Reinmuth
discovery_site	Heidelberg Obs.
discovered	30 August 1927
mpc_name	(1080) Orchis
alt_names	1927 QB1955 DT
A906 BH
pronounced
named_after	Orchis (flowering plant)
mp_category	main-belt(inner)
background
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	111.76 yr (40,821 days)
aphelion	3.0452 AU
perihelion	1.7924 AU
semimajor	2.4188 AU
eccentricity	0.2590
period	3.76 yr (1,374 days)
mean_anomaly	278.54°
mean_motion	/ day
inclination	4.5873°
asc_node	2.0437°
arg_peri	57.028°
mean_diameter	km
km
km
km
km
km
km
rotation	h
h
h
h
pole_ecliptic_lat	{{plainlist
* (255.0°, 27.0°) (λ<sub>1</sub>/β<sub>1</sub>)<ref name	"Ferret" /
* (71.0°, 28.0°) (λ<sub>2</sub>/β<sub>2</sub>)<ref name	"Ferret" /}}
albedo

spectral_type	Tholen F
B–V 0.624
U–B 0.206
abs_magnitude	(R)12.2012.3212.43

A906 BH background km km km km km km h h h

(255.0°, 27.0°) (λ1/β1)
(71.0°, 28.0°) (λ2/β2)}}

B–V 0.624 U–B 0.206

1080 Orchis, provisional designation , is a dark background asteroid from the inner regions of the asteroid belt. It was discovered on 30 August 1927, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The carbonaceous F-type asteroid has a rotation period of 16.1 hours and measures approximately 22 km in diameter. It was named after the flowering plant Orchis.

Orbit and classification

Orchis is a non-family asteroid of the main belt's background population. It orbits the Sun in the inner asteroid belt at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,374 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.26 and an inclination of 5° with respect to the ecliptic. The asteroid was first observed as at Heidelberg in January 1906. The body's observation arc begins with its official discovery observation in August 1927.

Naming

This minor planet was named after the flowering plant Orchis, a genus in the orchid family. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 102).

Reinmuth's flowers

Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between and . This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).

Physical characteristics

In the Tholen classification, Orchis is an uncommon F-type asteroid, a type which belongs to the wider C-complex of carbonaceous asteroids.

Rotation period and poles

In 2010, three rotational lightcurves of Orchis were obtained from photometric observations. Lightcurve analysis gave a rotation period of 16.061, 16.075 and 16.1 hours with a brightness amplitude of between 0.23 and 0.31 magnitude (). A modeled lightcurve based on optical data from a large collaboration network found a concurring period of 16.0657 hours and two spin axis of (255.0°, 27.0°) and (71.0°, 28.0°) in ecliptic coordinates (λ, β).

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 Wide-field Infrared Survey Explorer, Orchis measures between 20.755 and 24.62 kilometers in diameter and its surface has an albedo between 0.029 and 0.051. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0430 and a diameter of 23.28 kilometers based on an absolute magnitude of 12.2.

References

{{OED. orchis

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.

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