2839 Annette

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]

2839 Annette
Shape model of Annette from its lightcurve
Discovery [1]
Discovered byC. W. Tombaugh
Discovery siteLowell Obs.
Discovery date5 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 arc87.67 yr (32,023 days)
Aphelion2.5493 AU
Perihelion1.8838 AU
2.2166 AU
Eccentricity0.1501
3.30 yr (1,205 days)
200.55°
0° 17m 55.32s / day
Inclination4.8085°
44.569°
6.8264°
Physical characteristics
Mean diameter
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]

    Orbit and classification

    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]

    Naming

    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]

    Physical characteristics

    Rotation period
    Lightcurve-based 3D-model of Annette

    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]

    References
    1. "JPL Small-Body Database Browser: 2839 Annette (1929 TP)" (2017-06-02 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
    2. Schmadel, Lutz D. (2007). "(2839) Annette". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 232. doi:10.1007/978-3-540-29925-7_2840. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2839) Annette". Asteroid Lightcurve Database (LCDB). Retrieved 9 March 2017.
    4. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 9 March 2017.
    5. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 9 March 2017.
    6. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    7. Warner, Brian D. (September 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - late 2005 and early 2006" (PDF). Minor Planet Bulletin. 33 (3): 58–62. Bibcode:2006MPBu...33...58W. ISSN 1052-8091. Retrieved 18 March 2020.
    8. Buchheim, Robert K. (September 2007). "Lightcurves of 25 Phocaea, 468 Lina, 482 Petrina 551 Ortrud, 741 Botolphia, 834 Burnhamia, 2839 Annette, and 3411 Debetencourt" (PDF). Minor Planet Bulletin. 34 (3): 68–71. Bibcode:2007MPBu...34...68B. ISSN 1052-8091. Retrieved 18 March 2020.
    9. "2839 Annette (1929 TP)". Minor Planet Center. Retrieved 9 March 2017.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 March 2017.
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