_Marlene.png) Modelled shape ofMarlene from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 12 November 1923 |
| Designations | |
| (1010) Marlene | |
Named after | Marlene Dietrich (German actress and singer)[2] |
| 1923 PF · 1937 NB1 1950 CJ · 1950 EY A903 UD · A908 VA 1923 PF | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.61 yr (41,495 days) |
| Aphelion | 3.2329AU |
| Perihelion | 2.6278 AU |
| 2.9303 AU | |
| Eccentricity | 0.1033 |
| 5.02yr (1,832 days) | |
| 265.92° | |
| 0° 11m 47.4s / day | |
| Inclination | 3.9070° |
| 98.747° | |
| 279.74° | |
| Physical characteristics | |
| Dimensions | 43.38 km(derived)[3] 43.47±1.1 km[4] 46.37±0.51 km[5] 46.876±0.165 km[6] 47.07±0.75 km[7] 49.74±17.50 km[8] 51.085±0.156 km[9] |
| 29.0±0.4h[10] 31.06±0.02 h[11][a] 31.0651±0.0005 h[12] 31.066±0.005 h[13] | |
| 0.03±0.02[8] 0.0468±0.0119[9] 0.047±0.007[5] 0.0540(derived)[3] 0.056±0.002[7] 0.0647±0.003[4] | |
| C[3] | |
| 10.40[4][7][9] · 10.60[3][5][8] · 10.7[1] | |
1010 Marlene (prov. designation:A923 VHor1923 PF) is a carbonaceous backgroundasteroid from the outer regions of theasteroid belt, approximately 47 kilometers in diameter. It was discovered on 12 November 1923, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[14] The asteroid was named after German actress and singerMarlene Dietrich.[2]
Marlene is not a member of any knownasteroid family. It orbits the Sun in theouter main-belt at a distance of 2.6–3.2 AU once every 5.02 years (1,832 days). Its orbit has aneccentricity of 0.10 and aninclination of 4° with respect to theecliptic.[1]
The asteroid was first identified asA903 UD at the discovering observatory in October 1903. The body'sobservation arc begins at Heidelberg in January 1924, more than two months after its official discovery observation.[14]
Thisminor planet was named after German-bornMarlene Dietrich (1901–1992), actor, singer and high-profile entertainer duringWorld War II. The name was proposed by astronomer Gustav Stracke. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 97).[2]
Marlene is an assumed carbonaceousC-type asteroid.[3]
Photometric measurements ofMarlene – made by American astronomerBrian Warner at the Palmer Divide Observatory (716), Colorado, in February 2005 – showed alightcurve with a longer-than averagerotation period of31.06±0.02 hours and a brightness variation of0.32±0.02 inmagnitude (U=2+).[11][a] Most asteroids have periodsshorter than 20 hours.
Another lightcurve, obtained by French amateur astronomerRené Roy, gave a period of 29.0 hours and an amplitude of 0.17 magnitude (U=2).[10]
In 2013 and 2016, an international study modeled a lightcurve with a concurring period of 31.0651 and 31.066 hours, respectively. The study also determined twospin axis of (299.0°, 42.0°) and (106.0°, 47.0°) inecliptic coordinates (λ, β) (U=n.a.).[12][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,Marlene measures between 43.47 and 51.085 kilometers in diameter and its surface has analbedo between 0.03 and 0.0647.[4][5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.054 and a diameter of 43.38 kilometers based on anabsolute magnitude of 10.6.[3]
