119 Althaea

119 Althaea
	A three-dimensional model of 119 Althaea based on its light curve.
Discovery
Discovered by	James Craig Watson
Discovery date	3 April 1872
Designations
MPC designation	(119) Althaea
Pronunciation	/ælˈθiːə/[1]
Named after	Althaea
Minor planet category	Main belt
Orbital characteristics[2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	143.99 yr (52593 d)
Aphelion	2.7896 AU (417.32 Gm)
Perihelion	2.37335 AU (355.048 Gm)
Semi-major axis	2.58147 AU (386.182 Gm)
Eccentricity	0.080623
Orbital period	4.15 yr (1515.0 d)
Average orbital speed	18.51 km/s
Mean anomaly	114.868°
Mean motion	0° 14m 15.472s / day
Inclination	5.7831°
Longitude of ascending node	203.674°
Argument of perihelion	170.021°
Earth MOID	1.37297 AU (205.393 Gm)
Jupiter MOID	2.58409 AU (386.574 Gm)
TJupiter	3.413
Physical characteristics
Dimensions	57.30±1.1 km
Mass	2.0×1017 kg
Equatorial surface gravity	0.0160 m/s²
Equatorial escape velocity	0.0303 km/s
Rotation period	11.484 h (0.4785 d)[2][3]
Geometric albedo	0.2306±0.010
Temperature	~173 K
Spectral type	S
Absolute magnitude (H)	8.42

Althaea (minor planet designation: 119 Althaea) is a main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on April 3, 1872,[3] and named after Althaea, the mother of Meleager in Greek mythology. Two occultations by Althaea were observed in 2002, only a month apart.

Based upon its spectrum, this is classified as an S-type asteroid.[4] Photometric observations made in 1988 at the Félix Aguilar Observatory produced a light curve with a period of 11.484 ± 0.010 hours with a brightness variation of 0.365 ± 0.010 in magnitude.[3]

References

Noah Webster (1884) A Practical Dictionary of the English Language
Yeomans, Donald K., "119 Althaea", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
Hutton, R. G. (June 1990), "V+B Photoelectric Photometry of Asteroid 119 Althaea", The Minor Planet Bulletin, 17, pp. 15–17, Bibcode:1990MPBu...17...15H.
DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1), pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.

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