Astronomy:2839 Annette

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Short description: Flora family asteroid
2839 Annette
002839-asteroid shape model (2839) Annette.png
Shape model of Annette from its lightcurve
Discovery [1]
Discovered byC. W. Tombaugh
Discovery siteLowell Obs.
Discovery date5 October 1929
Designations
(2839) Annette
Named afterAnnette Tombaugh
(discoverer's daughter)[2]
1929 TP · 1937 AB1
1939 UL · 1962 TE
1970 BB · 1972 XF1
1982 VP
Minor planet categorymain-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc87.67 yr (32,023 days)
|{{{apsis}}}|helion}}2.5493 AU
|{{{apsis}}}|helion}}1.8838 AU
2.2166 AU
Eccentricity0.1501
Orbital period3.30 yr (1,205 days)
Mean anomaly200.55°
Mean motion0° 17m 55.32s / day
Inclination4.8085°
Longitude of ascending node44.569°
6.8264°
Physical characteristics
Mean diameter5.41±0.86 km[4]
7.313±0.150 km[5]
7.562±0.122 km[6]
Rotation period10.457±0.003 h[7]
10.4595±0.0001 h[8]
Geometric albedo0.0563±0.0118[6]
0.060±0.005[5]
0.24 (assumed)[3]
0.47±0.22[4]
S [3]
Absolute magnitude (H)12.9[1] · 12.92[4] · 14.35[3][6][8]


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]

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 ({{{1}}}).[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 ({{{1}}}). 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. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 2839 Annette (1929 TP)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002839. Retrieved 14 June 2017. 
  2. ↑ 2.0 2.1 2.2 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 978-3540002383. https://archive.org/details/dictionaryminorp00schm. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "LCDB Data for (2839) Annette". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2839%7CAnnette. Retrieved 9 March 2017. 
  4. ↑ 4.0 4.1 4.2 4.3 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. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  5. ↑ 5.0 5.1 5.2 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 9 March 2017. 
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  7. ↑ 7.0 7.1 Warner, Brian D. (September 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory – late 2005 and early 2006". Minor Planet Bulletin 33 (3): 58–62. ISSN 1052-8091. Bibcode: 2006MPBu...33...58W. http://www.minorplanet.info/MPB/issues/MPB_33-3.pdf. Retrieved 18 March 2020. 
  8. ↑ 8.0 8.1 8.2 Buchheim, Robert K. (September 2007). "Lightcurves of 25 Phocaea, 468 Lina, 482 Petrina 551 Ortrud, 741 Botolphia, 834 Burnhamia, 2839 Annette, and 3411 Debetencourt". Minor Planet Bulletin 34 (3): 68–71. ISSN 1052-8091. Bibcode: 2007MPBu...34...68B. http://www.minorplanet.info/MPB/issues/MPB_34-3.pdf. Retrieved 18 March 2020. 
  9. ↑ 9.0 9.1 "2839 Annette (1929 TP)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2839. Retrieved 9 March 2017. 
  10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 9 March 2017. 

External links



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