_Annette.png) Shape model ofAnnette from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | C. W. Tombaugh |
| Discovery site | Lowell Obs. |
| Discovery date | 5 October 1929 |
| Designations | |
| (2839) Annette | |
Named after | Annette Tombaugh (discoverer's daughter)[2] |
| 1929 TP · 1937 AB1 1939 UL · 1962 TE 1970 BB · 1972 XF1 1982 VP | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.67 yr (32,023 days) |
| Aphelion | 2.5493AU |
| Perihelion | 1.8838 AU |
| 2.2166 AU | |
| Eccentricity | 0.1501 |
| 3.30yr (1,205 days) | |
| 200.55° | |
| 0° 17m 55.32s / day | |
| Inclination | 4.8085° |
| 44.569° | |
| 6.8264° | |
| Physical characteristics | |
| 5.41±0.86 km[4] 7.313±0.150 km[5] 7.562±0.122 km[6] | |
| 10.457±0.003 h[7] 10.4595±0.0001 h[8] | |
| 0.0563±0.0118[6] 0.060±0.005[5] 0.24(assumed)[3] 0.47±0.22[4] | |
| S[3] | |
| 12.9[1] · 12.92[4] · 14.35[3][6][8] | |
2839 Annette (prov. designation:1929 TP) is a brightFlora asteroid from the inner regions of theasteroid belt. It was discovered on 5 October 1929, by American astronomerClyde Tombaugh atLowell Observatory during his search forPluto.[9] The presumedS-type asteroid has arotation period of 10.5 hours and measures approximately five kilometers (three miles) in diameter. It was named after the discoverer's daughter.[2]
Annette is aS-type asteroid and member of theFlora family, one of the largest families of stony asteroids. It orbits the Sun in theinner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,205 days). Its orbit has aneccentricity of 0.15 and aninclination of 5° with respect to theecliptic.[1] Due to aprecovery taken at Lowell Observatory, the body'sobservation arc was extended by 4 days prior to its official discovery observation.[9]
Thisminor planet was named after Clyde Tombaugh's daughter, Annette.[2] The approved naming citation was published by theMinor Planet Center on 22 June 1986 (M.P.C. 10845).[10]
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The first rotationallightcurve ofAnnette was obtained by American astronomerBrian Warner at his Palmer Divide Observatory, Colorado, in December 2005. It gave arotation period of 10.457 hours with a brightness variation of 0.92magnitude (U=3-).[7] In November 2006, a second lightcurve by astronomer Robert Buchheim at Altimira Observatory in southern California gave a concurring period of 10.4595 hours and an amplitude of 0.64 magnitude (U=3). He also noted a significantly fainterabsolute magnitude of 14.35 than previously reported.[8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Annette measures between 5.41 and 7.562 kilometers in diameter and its surface has analbedo between 0.056 and 0.47,[4][5][6] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the largest member and namesake of its family – and calculates a diameter of 3.66 kilometers using Robert Buchheim's fainterabsolute magnitude of 14.35.[3]
