29 Amphitrite

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29 Amphitrite

Discovery A
Discoverer	A. Marth
Discovery date	March 1, 1854
Alternate designations B	A899 NG
Category	Main belt
Orbital elements C
Epoch June 14, 2006 (JD 2453900.5)
Eccentricity (e)	0.073
Semi-major axis (a)	382.103 Gm (2.554 AU)
Perihelion (q)	354.398 Gm (2.369 AU)
Aphelion (Q)	409.809 Gm (2.739 AU)
Orbital period (P)	1491.013 d (4.08 a)
Mean orbital speed	18.61 km/s
Inclination (i)	6.096°
Longitude of the ascending node (Ω)	356.501°
Argument of perihelion (ω)	63.433°
Mean anomaly (M)	229.662°
Physical characteristics D
Dimensions	212.2 km †
Mass	1.0×1019 kg
Density	2.0 g/cm³
Surface gravity	0.0593 m/s²
Escape velocity	0.1122 km/s
Rotation period	0.2246 d (5.390 h) [1]
Spectral class	S
Absolute magnitude	5.85
Albedo (geometric)	0.1793 [2]
Mean surface temperature	~170 K
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29 Amphitrite (am'-fə-trye'-tee (key)) is one of the largest Main belt asteroids.

Amphitrite was discovered by Albert Marth on March 1, 1854. It was his only asteroid discovery. It is named after Amphitrite, a sea goddess in Greek mythology.

A satellite is suspected based on the lightcurve data.^{[1] [2]}

[edit] Aspects

Stationary, retrograde	Opposition	Distance to Earth (AU)	Maximum brightness (mag)	Stationary, prograde	Conjunction to Sun
February 7, 2005	March 30, 2005	1.66907	9.2	May 19, 2005	November 22, 2005
May 25, 2006	July 12, 2006	1.65122	9.4	September 1, 2006	March 7, 2007
October 2, 2007	November 18, 2007	1.38949	8.8	December 30, 2007	July 26, 2008
January 30, 2009	March 21, 2009	1.64688	9.1	May 11, 2009	November 14, 2009
May 16, 2010	July 3, 2010	1.67434	9.4	August 22, 2010	February 25, 2011
September 19, 2011	November 6, 2011	1.39018	8.7	December 19, 2011	July 15, 2012
January 22, 2013	March 12, 2013	1.62243	9.1	May 2, 2013	November 6, 2013
May 6, 2014	June 24, 2014	1.69407	9.5	August 13, 2014	February 15, 2015
September 7, 2015	October 25, 2015	1.39680	8.7	December 8, 2015	July 3, 2016
January 14, 2017	March 3, 2017	1.59637	9.1	April 23, 2017	October 29, 2017
April 27, 2018	June 16, 2018	1.71002	9.5	August 4, 2018	February 6, 2019
August 27, 2019	October 14, 2019	1.40915	8.7	November 28, 2019	June 21, 2020

[edit] References

1. ^ Tedesco, E. F. (March 1979). "Binary Asteroids: Evidence for Their Existence from Lightcurves". Science, New Series 203 (4383): 905-907.
2. ^ van Flandern, T. C.; Tedesco, E. F.; Binzel, R. P. (1979). "Satellites of asteroids". 'Asteroids', 443-465, Tucson, AZ: University of Arizona Press.

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