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2839 Annette (prov. designation: 1929 TP) is a bright Flora asteroid from the inner regions of the asteroid belt. It was discovered on 5 October 1929, by American astronomer Clyde Tombaugh at Lowell Observatory during his search for Pluto.[9] The presumed S-type asteroid has a rotation period of 10.5 hours and measures approximately 5 kilometers (3.1 miles) in diameter. It was named after the discoverer's daughter.[2]
_Annette.png) Shape model of Annette from its lightcurve | |
| 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 | 2.5493 AU |
| Perihelion | 1.8838 AU |
| 2.2166 AU | |
| Eccentricity | 0.1501 |
| 3.30 yr (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] | |
Annette is a S-type asteroid and member of the Flora family, one of the largest families of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,205 days). Its orbit has an eccentricity of 0.15 and an inclination of 5° with respect to the ecliptic.[1] Due to a precovery taken at Lowell Observatory, the body's observation arc was extended by 4 days prior to its official discovery observation.[9]
This minor planet was named after Clyde Tombaugh's daughter, Annette.[2] The approved naming citation was published by the Minor Planet Center on 22 June 1986 (M.P.C. 10845).[10]
Rotation period
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The first rotational lightcurve of Annette was obtained by American astronomer Brian Warner at his Palmer Divide Observatory, Colorado, in December 2005. It gave a rotation period of 10.457 hours with a brightness variation of 0.92 magnitude (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 fainter absolute magnitude of 14.35 than previously reported.[8]
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Annette measures between 5.41 and 7.562 kilometers in diameter and its surface has an albedo between 0.056 and 0.47,[4][5][6] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 3.66 kilometers using Robert Buchheim's fainter absolute magnitude of 14.35.[3]
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