29 Amphitrite

29 Amphitrite
Lightcurve-based 3D-model of Amphitrite
Discovery [1]
Discovered by A. Marth
Discovery site London
Discovery date 1 March 1854
Designations
MPC designation (29) Amphitrite
Pronunciation /ˌæmfɪˈtraɪtiː/
am-fi-TRY-tee
Named after
 Amphitrite [2]
(Greek mythology)
A899 NG
main-belt [1][3] · (middle)
background [4][5]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 162.83 yr (59,472 d)
Aphelion 2.7400 AU
Perihelion 2.3712 AU
2.5556 AU
Eccentricity 0.0722
4.09 yr (1,492 d)
187.97°
0° 14m 28.68s / day
Inclination 6.0823°
356.37°
63.036°
Physical characteristics
Dimensions 233 km × 212 km × 193 km[6]
Mean diameter
 189.559±1.129 km[7]
196±22 km[8]
206.86 km[9]
212.22±6.8 km[10]
227.149±3.975 km[11]
Mass 1.18×1019 kg[6]
Mean density
 2.36±0.26 g/cm3[6]
5.3921 h[12][5]
0.1568±0.0348[11]
0.1793±0.012[10]
0.195[9]
0.216±0.043[7]
S [5]
5.85[1][3]
6.0[4]

    29 Amphitrite (/ˌæmfɪˈtraɪtiː/ am-fi-TRY-tee) is one of the largest S-type asteroids, approximately 200 kilometers (124 miles) in diameter, and probably third largest after Eunomia and Juno, although Iris and Herculina are similar in size.

    Discovery

    Clockwise (29) Amphitrite, (324) Bamberga, (2) Pallas and (89) Julia. Picture by VLT

    Amphitrite was discovered by Albert Marth on March 1, 1854, at the private South Villa Observatory, in Regent's Park, London. It was Marth's only asteroid discovery. Its name was chosen by George Bishop, the owner of the observatory, who named it after Amphitrite, a sea goddess in Greek mythology.[2]

    Characteristics

    Amphirite's orbit is less eccentric and inclined than those of its larger cousins; indeed, it is the most circular of any asteroid discovered up to that point. As a consequence, it never becomes as bright as Iris or Hebe, especially as it is much further from the Sun than those asteroids. It can reach magnitudes of around +8.6 at a favorable opposition, but usually is around the binocular limit of +9.5.

    In 2007, James Baer and Steven R. Chesley estimated Amphitrite to have a mass of 1.9×1019 kg.[13] A more recent estimate by Baer suggests it has a mass of 1.18×1019 kg.[6]

    A satellite of the asteroid is suspected to exist, based on lightcurve data collected by Edward F. Tedesco.[14][15] In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.[16]

    References

    1. 1 2 3 "29 Amphitrite". Minor Planet Center. Retrieved 1 June 2018.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (29) Amphitrite. Springer Berlin Heidelberg. p. 18. ISBN 978-3-540-00238-3. Retrieved 1 June 2018.
    3. 1 2 3 "JPL Small-Body Database Browser: 29 Amphitrite" (2018-05-23 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2018.
    4. 1 2 "Asteroid (29) Amphitrite". AstDyS-2, Asteroids – Dynamic Site. Retrieved 25 May 2018.
    5. 1 2 3 "Asteroid 29 Amphitrite". Small Bodies Data Ferret. Retrieved 1 June 2018.
    6. 1 2 3 4 Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 2008-11-27.
    7. 1 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" (PDF). The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 1 June 2018.
    8. ↑ Hanus, J.; Marchis, F.; Durech, J. (September 2013). "Sizes of main-belt asteroids by combining shape models and Keck adaptive optics observations" (PDF). Icarus. 226 (1): 1045–1057. arXiv:1308.0446. Bibcode:2013Icar..226.1045H. doi:10.1016/j.icarus.2013.07.023. Retrieved 1 June 2018.
    9. 1 2 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 1 June 2018. Online catalog
    10. 1 2 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Archived from the original on 3 June 2016. Retrieved 1 June 2018.
    11. 1 2 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 June 2018. (catalog)
    12. ↑ "LCDB Data for (29) Amphitrite". Asteroid Lightcurve Database (LCDB). Retrieved 1 June 2018.
    13. ↑ Baer, James; Steven R. Chesley (2008). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" (PDF). Celestial Mechanics and Dynamical Astronomy. Springer Science+Business Media B.V. 2007. 100 (2008): 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. Retrieved 2008-11-10.
    14. ↑ Tedesco, E. F. (March 1979). "Binary Asteroids: Evidence for Their Existence from Lightcurves". Science, New Series. 203 (4383): 905–907. Bibcode:1979Sci...203..905T. doi:10.1126/science.203.4383.905. PMID 17771729.
    15. ↑ van Flandern, T. C.; Tedesco, E. F.; Binzel, R. P. (1979). "Satellites of asteroids". Asteroids. Tucson, AZ: University of Arizona Press. pp. 443–465.
    16. ↑ Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results", Abstracts of the Lunar and Planetary Science Conference, 19, pp. 405–406, Bibcode:1988LPI....19..405G

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