622 Esther

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)
Alternative designations	1906 WP
Minor planet category	main-belt ·(inner)
Orbital characteristics
	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
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

Last updated September 25, 2025

622 Esther is a minor planet orbiting the Sun.

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]

References

1 2 Lutz D. Schmadel (2003). Dictionary of Minor Planet Names (Fifth ed.). Heidelberg, N. Y: Springer Science & Business Media. p. 63. ISBN 978-3-540-00238-3.
↑ "622 Esther (1906 WP)". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 5 May 2016.
1 2 Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018 , retrieved 14 April 2015.

External links

622 Esther at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
622 Esther at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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[namedafter-1] 1 2 Lutz D. Schmadel (2003). Dictionary of Minor Planet Names (Fifth ed.). Heidelberg, N. Y: Springer Science & Business Media. p. 63. ISBN 978-3-540-00238-3.

[jpldata-2] "622 Esther (1906 WP)". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 5 May 2016.

[icarus186_1_126-3] 1 2 Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018 , retrieved 14 April 2015.

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