119 Althaea

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.

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
Alternative designations	A872 GA; 1972 KO
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 (sidereal)	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
Synodic 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

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]