1234 Elyna

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1234 Elyna
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 18 October 1931
MPC designation (1234) Elyna
Named after
Elyna (Kobresia)[2]
(flowering plant)
1931 UF · 1933 BN
main-belt · (outer)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 85.63 yr (31,277 days)
Aphelion 3.2788 AU
Perihelion 2.7526 AU
3.0157 AU
Eccentricity 0.0873
5.24 yr (1,913 days)
0° 11m 17.52s / day
Inclination 8.5120°
Physical characteristics
Dimensions 22.876±0.465 km[5]
22.88±0.47 km[5]
25.38±8.51 km[6]
25.70±3.2 km[7]
26.00 km (derived)[3]
29.08±0.90 km[8]
5.421±0.001 h[9]
5.4219±0.0001 h[10]
5.4221±0.0001 h[10]
17.6 h (poor)[11]
0.1286 (derived)[3]
SMASS = K[1][3]
10.71±0.24[12] · 10.77[3][11] · 10.80[5] · 10.9[1] · 10.98[6] · 11.50[7][8]

1234 Elyna, provisional designation 1931 UF, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 18 October 1931, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory.[13] The asteroid was named after the flowering plant Elyna (Kobresia; bog sedges).[2]

Orbit and classification[edit]

Elyna is a member the Eos family (606),[3][4] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.[14]:23 It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,913 days; semi-major axis 3.02 AU). Its orbit has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg, four days after its official discovery observation.[13]

Physical characteristics[edit]

In the SMASS classification, Elyna is a K-type asteroid,[1][3] which agrees with the overall spectral type for members of the Eos family.[14]:23

Rotation period[edit]

Several rotational lightcurves of Elyna were obtained from photometric observations since 1983. Lightcurve analysis gave a rotation period of 5.421 hours with a consolidated brightness amplitude between 0.21 and 0.37 magnitude (U=3-/2/3/1).[9][10][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, Elyna measures between 22.876 and 29.08 kilometers in diameter and its surface has an albedo between 0.055 and 0.162.[5][6][7][8]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1286 and a diameter of 26.00 kilometers based on an absolute magnitude of 10.77.[3]


This minor planet was named after the flowering plant Elyna, a subgenus of the genus Kobresia in the Cyperaceae family, sometimes called bog sedges. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 114).[2]


The initials of the minor planets (1227) through (1234), all discovered by Reinmuth, spell out "G. Stracke". Gustav Stracke was a German astronomer and orbit computer, who had asked that no planet be named after him. In this manner Reinmuth was able to honour the man whilst honoring his wish. Nevertheless, Reinmuth directly honored Stracke by naming planet 1019 Strackea later on.[2] The astronomer Brian Marsden was honored by the same type of meta-naming using consecutive initial letters in 1995, spelling out "Brian M." in the sequence of minor planets (5694) through (5699).[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). 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).[15]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1234 Elyna (1931 UF)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 6 January 2018. 
  2. ^ a b c d e Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1234) Elyna. Springer Berlin Heidelberg. pp. 102–103. ISBN 978-3-540-00238-3. Archived from the original on 12 March 2016. Retrieved 27 January 2018. 
  3. ^ a b c d e f g h "LCDB Data for (1234) Elyna". Asteroid Lightcurve Database (LCDB). Retrieved 6 January 2018. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 6 January 2018. 
  5. ^ a b c d e 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 6 January 2018. 
  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 6 January 2018. 
  7. ^ 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. Archived from the original on 2016-06-03. Retrieved 6 January 2018. 
  8. ^ 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 6 January 2018. 
  9. ^ a b Aznar Macias, Amadeo; Carreno Garcerain, Alfonso; Arce Masego, Enrique; Brines Rodriguez, Pedro; Lozano de Haro, Juan; Fornas Silva, Alvaro; et al. (July 2016). "Twenty-one Asteroid Lightcurves at Group Observadores de Asteroides (OBAS): Late 2015 to Early 2016". The Minor Planet Bulletin. 43 (3): 257–263. Bibcode:2016MPBu...43..257A. ISSN 1052-8091. Retrieved 6 January 2018. 
  10. ^ a b c Behrend, Raoul. "Asteroids and comets rotation curves – (1234) Elyna". Geneva Observatory. Retrieved 6 January 2018. 
  11. ^ a b c Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus: 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 6 January 2018. 
  12. ^ 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 6 January 2018. 
  13. ^ a b "1234 Elyna (1931 UF)". Minor Planet Center. Retrieved 6 January 2018. 
  14. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 6 January 2018. 
  15. ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1054) Forsytia. Springer Berlin Heidelberg. p. 90. ISBN 978-3-540-00238-3. Archived from the original on 24 September 2017. Retrieved 27 January 2018. 

External links[edit]