| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 12 January 1924 |
| Designations | |
| (1092) Lilium | |
| Pronunciation | /ˈlɪliəm/[2] |
Named after | Līlium[3](flowering plant) |
| 1924 PN · 1929 BE 1936 QE | |
| main-belt · (outer)[4] background[5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.67 yr (40,421 days) |
| Aphelion | 3.1444AU |
| Perihelion | 2.6552 AU |
| 2.8998 AU | |
| Eccentricity | 0.0843 |
| 4.94yr (1,804 days) | |
| 200.62° | |
| 0° 11m 58.56s / day | |
| Inclination | 5.3885° |
| 307.49° | |
| 316.51° | |
| Physical characteristics | |
| Dimensions | 37.78±12.75 km[6] 40.276±0.243 km[7] 42.853±0.266 km[8] 43.23±0.33 km[9] 46.17±1.5 km[10] 49.56±13.84 km[11] 52.79±0.87 km[12] |
| 17.63h[13] 24.60±0.05 h[14][a] | |
| 0.030±0.001[12] 0.0390±0.003[10] 0.04±0.02[11] 0.044±0.005[9] 0.0452±0.0071[8] 0.05±0.03[6] | |
| C(assumed)[4] B–V = 0.840[1] U–B = 0.330[1] | |
| 10.82[1][4][8][9][10][11][12][13] 10.90±0.28[15] · 10.97[6] | |
1092 Lilium, provisional designation1924 PN, is a dark, carbonaceous backgroundasteroid from the outer regions of theasteroid belt, approximately 44 kilometers in diameter. It was discovered on 12 January 1924, by German astronomerKarl Reinmuth at theHeidelberg Observatory in southwest Germany.[16] The asteroid was named after the flowerLilium (true lily).[3]
Lilium is a non-family asteroid from the main belt'sbackground population.[5] It orbits the Sun in theouter asteroid belt at a distance of 2.7–3.1 AU once every 4 years and 11 months (1,804 days). Its orbit has aneccentricity of 0.08 and aninclination of 5° with respect to theecliptic.[1]
The body'sobservation arc begins with aprecovery image taken at theLowell Observatory in July 1906, almost 18 years prior to its official discovery observation at Heidelberg.[16]
Lilium is an assumed carbonaceousC-type asteroid.[4]
In February 2008, a rotationallightcurve ofLilium was obtained from photometric observations by American astronomerBrian Warner at his Palmer Divide Observatory (716) in Colorado.[a] Lightcurve analysis gave a longer-than averagerotation period of 24.60 hours with a brightness amplitude of 0.25magnitude (U=3),[14] superseding a period of 17.63 hours byRichard Binzel from March 1984 (U=1).[13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Lilium measures between 37.78 and 52.79 kilometers in diameter and its surface has analbedo between 0.030 and 0.05.[6][7][8][9][10][11][12]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0390 and a diameter of 46.17 kilometers based on anabsolute magnitude of 10.82.[4]
Thisminor planet was named by the discoverer after the true lily flowering planet,Lilium. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 103).[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).[17]
