1080 Orchis
Modelled shape of Orchis from its lightcurve
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg 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 arc111.76 yr (40,821 days)
Aphelion3.0452 AU
Perihelion1.7924 AU
2.4188 AU
Eccentricity0.2590
3.76 yr (1,374 days)
278.54°
0° 15m 43.2s / day
Inclination4.5873°
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]

    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]

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1080 Orchis (1927 QB)" (2017-10-29 last obs.). Jet Propulsion Laboratory. Retrieved 28 November 2017.
    2. ↑ "orchis". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    3. 1 2 3 Schmadel, Lutz D. (2007). "(1080) Orchis". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 92. doi:10.1007/978-3-540-29925-7_1081. ISBN 978-3-540-00238-3.
    4. 1 2 3 4 5 6 7 "LCDB Data for (1080) Orchis". Asteroid Lightcurve Database (LCDB). Retrieved 28 November 2017.
    5. 1 2 "Asteroid 1080 Orchis – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
    6. 1 2 3 4 Masiero, Joseph R.; Nugent, C.; Mainzer, A. K.; Wright, E. L.; Bauer, J. M.; Cutri, R. M.; et al. (October 2017). "NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos". The Astronomical Journal. 154 (4): 10. arXiv:1708.09504. Bibcode:2017AJ....154..168M. doi:10.3847/1538-3881/aa89ec.
    7. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497. Retrieved 28 November 2017.
    8. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    9. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010.
    10. 1 2 3 4 5 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    11. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381. Retrieved 28 November 2017.
    12. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. S2CID 46350317. Retrieved 28 November 2017.
    13. 1 2 Strabla, Luca; Quadri, Ulisse; Girelli, Roberto (July 2011). "Minor Planet Lightcurve Analysis at Bassano Bresciano Observatory: 2010 October - 2011 March". The Minor Planet Bulletin. 38 (3): 169–172. Bibcode:2011MPBu...38..169S. ISSN 1052-8091. Retrieved 28 November 2017.
    14. 1 2 Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. S2CID 119112278.
    15. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. S2CID 8342929. Retrieved 28 November 2017.
    16. 1 2 Ruthroff, John C. (April 2011). "Lightcurve Analysis of Eight Main-belt Asteroids and a Revised Period for 185 Eunike". The Minor Planet Bulletin. 38 (2): 86–88. Bibcode:2011MPBu...38...86R. ISSN 1052-8091. Retrieved 28 November 2017.
    17. 1 2 "Asteroid 1080 Orchis". Small Bodies Data Ferret. Retrieved 13 March 2020.
    18. 1 2 "1080 Orchis (1927 QB)". Minor Planet Center. Retrieved 28 November 2017.
    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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