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
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 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. [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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    19. ↑ Schmadel, Lutz D. (2007). "(1054) Forsytia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 90. doi:10.1007/978-3-540-29925-7_1055. ISBN   978-3-540-00238-3.
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