254 Augusta

254 Augusta is a main-belt asteroid, discovered on 31 March 1886 by astronomer Johann Palisa at Vienna Observatory, Austria. The stony S-type asteroid measures about 12 kilometers in diameter.^[1] It is the first-numbered member of the Augusta family, after which the small Asteroid family and subgroup of the main-belt has been named. Augusta was named after the German–Austrian writer Auguste von Littrow (1819–1890), widow of astronomer Carl Ludwig von Littrow, who was a former director of the Vienna Observatory.^[3]

254 Augusta

Modelled shape of Augusta from its lightcurve
Discovery[1]
Discovered by	J. Palisa
Discovery site	Vienna Obs.
Discovery date	31 March 1886
Designations
MPC designation	(254) Augusta
Pronunciation	/ɒˈɡʌstə/[2]
Named after	Auguste von Littrow[3]
Alternative designations	A886 FA
Minor planet category	Augusta · main-belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	130.04 yr (47498 d)
Aphelion	2.4613 AU (368.21 Gm)
Perihelion	1.9281 AU (288.44 Gm)
Semi-major axis	2.1947 AU (328.32 Gm)
Eccentricity	0.12147
Orbital period (sidereal)	3.25 yr (1187.5 d)
Average orbital speed	20.1 km/s[citation needed]
Mean anomaly	340.92°
Mean motion	0° 18m 11.34s / day
Inclination	4.5131°
Longitude of ascending node	28.473°
Argument of perihelion	233.14°
Earth MOID	0.916708 AU (137.1376 Gm)
Jupiter MOID	2.58938 AU (387.366 Gm)
TJupiter	3.656
Physical characteristics
Dimensions	12.11±1.1 km
Synodic rotation period	5.8949 h (0.24562 d)
Geometric albedo	0.1695±0.036
Spectral type	B–V = 0.845 U–B = 0.505 Tholen = S
Absolute magnitude (H)	12.13