1080 Orchis

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1080 Orchis
001080-asteroid shape model (1080) Orchis.png
Modelled shape of Orchis from its lightcurve
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date30 August 1927
Designations
(1080) Orchis
Pronunciation /ˈɔːrkɪs/ [2]
Named after
 Orchis (flowering plant) [3]
1927 QB ·1955 DT
A906 BH
main-belt  ·(inner) [4]
background [5]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 111.76 yr (40,821 days)
Aphelion 3.0452 AU
Perihelion 1.7924 AU
2.4188 AU
Eccentricity 0.2590
3.76 yr (1,374 days)
278.54°
0° 15m 43.2s / day
Inclination 4.5873°
2.0437°
57.028°
Physical characteristics
Mean diameter
20.755±8.470 km [6]
21.797±0.130 km [7]
21.86±0.26 km [8]
22.918±0.241 km [9]
23.28±1.7 km [4] [10]
23.53±6.59 km [11]
24.62±6.75 km [12]
16.061±0.004 h [13]
16.0657±0.0005 h [14]
16.075±0.0207 h [15]
16.1±0.1 h [16]
  • (255.0°, 27.0°) (λ1/β1) [17]
  • (71.0°, 28.0°) (λ2/β2) [17]
0.029±0.002 [7]
0.03±0.02 [11]
0.031±0.032 [12]
0.0331±0.0028 [9]
0.0430±0.007 [4] [10]
0.0508±0.0499 [6]
0.051±0.001 [8]
Tholen = F [1] [4]
B–V = 0.624 [1]
U–B = 0.206 [1]
12.133±0.002(R) [15]  ·12.20 [1] [4] [8] [9] [10] [11]  ·12.32 [6]  ·12.43 [12]

    1080 Orchis, provisional designation 1927 QB, is an 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. [18] The carbonaceous F-type asteroid has a rotation period of 16.1 hours and measures approximately 22 kilometers (14 miles) in diameter. It was named after the flowering plant Orchis . [3]

    Contents

    Orbit and classification

    Orchis is a non-family asteroid of the main belt's background population. [5] 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. [1] The asteroid was first observed as A906 BH at Heidelberg in January 1906. The body's observation arc begins with its official discovery observation in August 1927. [18]

    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 ). [3]

    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 (1009) and (1200). 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). [19]

    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. [1] [4]

    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 ( U=2+/2/3 ). [13] [15] [16] 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). [14]

    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. [6] [7] [8] [9] [10] [11] [12] 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. [4] [10]

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    References

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    2. ↑ "orchis" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
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