1085 Amaryllis

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1085 Amaryllis
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 31 August 1927
MPC designation (1085) Amaryllis
Pronunciation /ˌæməˈrɪlɪs/
Named after
(flowering plant)
1927 QH · 1964 CL
A908 HB · A915 QA
A921 RC
main-belt · (outer)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 109.40 yr (39,957 days)
Aphelion 3.3182 AU
Perihelion 3.0506 AU
3.1844 AU
Eccentricity 0.0420
5.68 yr (2,076 days)
0° 10m 24.24s / day
Inclination 6.6396°
Physical characteristics
Dimensions 65.55±14.66 km[5]
67.14±21.21 km[6]
69.281±0.124 km[7]
69.68 km (derived)[3]
69.95±1.4 km[8]
71.025±1.105 km[9]
72.93±0.78 km[10]
18.111±0.025 h[11]
18.2±0.1 h[12]
0.0437 (derived)[3]
X[13] · C (assumed)[3]
9.40[8][9][10] · 9.70[5] · 9.8[1][3] · 9.81[6] · 9.92±0.25[13]

1085 Amaryllis (/ˌæməˈrɪlɪs/), provisional designation 1927 QH, is a background asteroid from the outer regions of the asteroid belt, approximately 69 kilometers in diameter. It was discovered on 31 August 1927, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[14] The asteroid was named after the flowering planet Amaryllis.[2]

Orbit and classification[edit]

Amaryllis is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 3.1–3.3 AU once every 5 years and 8 months (2,076 days). Its orbit has an eccentricity of 0.04 and an inclination of 7° with respect to the ecliptic.[1]

The asteroid was first identified as A908 HB at Taunton Observatory (803) in April 1908. A few days later, the body's observation arc begins at the United States Naval Observatory (786) in May 1908, or more than 19 years prior to its official discovery observation at Heidelberg.[14]

Physical characteristics[edit]

Amaryllis has been characterized as an X-type asteroid by Pan-STARRS photometric survey.[13] It is also an assumed carbonaceous C-type asteroid.[3]

Rotation period[edit]

In March 2004, a first rotational lightcurve of Amaryllis was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 18.2 hours with a brightness variation of 0.20 magnitude (U=2).[12] In May 2016, the Spanish amateur astronomer group OBAS (Asteroid Observers, Spanish: Observadores de Asteroids) measured a refined period of 18.111 hours with an amplitude of 0.19 magnitude (U=3-).[11]

Diameter and albedo[edit]

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, Amaryllis measures between 65.55 and 72.93 kilometers in diameter and its surface has an albedo between 0.04 and 0.067.[5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0437 and a diameter of 69.68 kilometers based on an absolute magnitude of 9.8.[3]


This minor planet was named after the flowering planet Amaryllis, also known as belladonna lily, Jersey lily, naked lady, or amarillo. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 102).[2]

Reinmuth's flowers[edit]

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) and also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were named after plants, in particular flowering plants (also see list of minor planets named after animals and plants § Plants).[15]


  1. ^ a b c d "JPL Small-Body Database Browser: 1085 Amaryllis (1927 QH)" (2017-09-23 last obs.). Jet Propulsion Laboratory. Retrieved 24 October 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1085) Amaryllis. Springer Berlin Heidelberg. p. 92. ISBN 978-3-540-00238-3. Retrieved 24 October 2017. 
  3. ^ a b c d e f g "LCDB Data for (1085) Amaryllis". Asteroid Lightcurve Database (LCDB). Retrieved 24 October 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 24 October 2017. 
  5. ^ a b c d 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:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 24 October 2017. 
  6. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 24 October 2017. 
  7. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 24 October 2017. 
  8. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 24 October 2017. 
  9. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 24 October 2017. 
  10. ^ a b c d 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. Retrieved 24 October 2017. 
  11. ^ a b Mansego, Enrique Arce; Rodriguez, Pedro Brines; de Haro, Juan Lozano; Chiner, Onofre Rodrigo; Silva, Alvaro Fornas; Porta, David Herrero; et al. (October 2016). "Eighteen Asteroids Lightcurves at Asteroides Observers (OBAS) - MPPD: 2016 March-May". The Minor Planet Bulletin. 43 (4): 332–336. Bibcode:2016MPBu...43..332M. ISSN 1052-8091. Retrieved 24 October 2017. 
  12. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1085) Amaryllis". Geneva Observatory. Retrieved 24 October 2017. 
  13. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 24 October 2017. 
  14. ^ a b "1085 Amaryllis (1927 QH)". Minor Planet Center. Retrieved 24 October 2017. 
  15. ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1054) Forsytia. Springer Berlin Heidelberg. p. 90. ISBN 978-3-540-00238-3. Retrieved 7 October 2017. 

External links[edit]