622 Esther

622 Esther is a minor planet orbiting the Sun.

622 Esther

Discovery
Discovered by	Joel Hastings Metcalf
Discovery site	Taunton, Massachusetts
Discovery date	13 November 1906
Designations
MPC designation	(622) Esther
Named after	Esther (biblical figure)[1]
Alternative designations	1906 WP
Minor planet category	main-belt · (inner)
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	109.40 yr (39959 d)
Aphelion	2.9999 AU (448.78 Gm)
Perihelion	1.8313 AU (273.96 Gm)
Semi-major axis	2.4156 AU (361.37 Gm)
Eccentricity	0.24189
Orbital period (sidereal)	3.75 yr (1371.3 d)
Mean anomaly	93.681°
Mean motion	0° 15m 45.072s / day
Inclination	8.6435°
Longitude of ascending node	142.046°
Argument of perihelion	256.687°
Earth MOID	0.859795 AU (128.6235 Gm)
Jupiter MOID	2.48023 AU (371.037 Gm)
TJupiter	3.461
Physical characteristics[3]
Dimensions	40 × 24 × 24 km ± 26% 29±8 km
Sidereal rotation period	47.5 h (1.98 d)
Spectral type	S-type asteroid
Absolute magnitude (H)	10.3

The asteroid is named after the biblical figure Esther.^[1]

In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.11 AU. The resulting data yielded an effective diameter of 29 ± 8 km.^[3]