 Lightcurve-base 3D-model of 1234 Elyna. | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 18 October 1931 |
| Designations | |
| (1234) Elyna | |
| Pronunciation | /ɪˈlaɪnə/[2] |
Named after | Elȳna (Kobresia)[3] (flowering plant) |
| 1931 UF · 1933 BN | |
| main-belt · (outer) Eos[4][5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.63 yr (31,277 days) |
| Aphelion | 3.2788AU |
| Perihelion | 2.7526 AU |
| 3.0157 AU | |
| Eccentricity | 0.0873 |
| 5.24yr (1,913 days) | |
| 148.48° | |
| 0° 11m 17.52s / day | |
| Inclination | 8.5120° |
| 304.68° | |
| 87.424° | |
| Physical characteristics | |
| Dimensions | 22.876±0.465 km[6] 22.88±0.47 km[6] 25.38±8.51 km[7] 25.70±3.2 km[8] 26.00 km(derived)[4] 29.08±0.90 km[9] |
| 5.421±0.001h[10] 5.4219±0.0001 h[11] 5.4221±0.0001 h[11] 17.6 h(poor)[12] | |
| 0.055±0.004[9] 0.0672±0.020[8] 0.10±0.07[7] 0.1286(derived)[4] 0.162±0.031[6] | |
| SMASS =K[1][4] | |
| 10.71±0.24[13] · 10.77[4][12] · 10.80[6] · 10.9[1] · 10.98[7] · 11.50[8][9] | |
1234 Elyna/ɪˈlaɪnə/, provisional designation1931 UF, is an Eoanasteroid from the outer regions of theasteroid belt, approximately 25 kilometers in diameter. It was discovered on 18 October 1931, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory.[14] The asteroid was named after the flowering plantElyna (Kobresia; bog sedges).[3]
Elyna is a member theEos family (606),[4][5] the largestasteroid family of theouter main belt consisting of nearly 10,000 asteroids.[15]: 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 aneccentricity of 0.09 and aninclination of 9° with respect to theecliptic.[1] The body'sobservation arc begins at Heidelberg, four days after its official discovery observation.[14]
In theSMASS classification,Elyna is aK-type asteroid,[1][4] which agrees with the overallspectral type for members of the Eos family.[15]: 23
Several rotationallightcurves ofElyna were obtained from photometric observations since 1983. Lightcurve analysis gave arotation period of 5.421 hours with a consolidated brightness amplitude between 0.21 and 0.37magnitude (U=3-/2/3/1).[10][11][12]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Elyna measures between 22.876 and 29.08 kilometers in diameter and its surface has analbedo between 0.055 and 0.162.[6][7][8][9]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1286 and a diameter of 26.00 kilometers based on anabsolute magnitude of 10.77.[4]
Thisminor planet was named after theflowering plantElyna, a subgenus of the genusKobresia in the familyCyperaceae, sometimes called bog sedges. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 114).[3]
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 planet1019 Strackea later on.[3] The astronomerBrian 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).[3]
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 with1054 Forsytia, that were all named after plants, in particularflowering plants(also see list of minor planets named after animals and plants).[16]
