1627 Ivar

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**1627 Ivar**
Discovery ^A

Discoverer	Ejnar Hertzsprung
Discovery date	September 25, 1929
Alternate designations ^B	1929 SH; 1957 NA; 1957 XA
Category	Amor, Mars crosser
Orbital elements ^C
Epoch November 26, 2005 (JD 2453700.5 )
Eccentricity (e)	0.397
Semi-major axis (a)	278.746 Gm (1.863 AU)
Perihelion (q)	168.152 Gm, (1.124 AU)
Aphelion (Q)	389.340 Gm (2.603 AU)
Orbital period (P)	929.016 d, (2.544 a)
Mean orbital speed	20.934 km/s
Inclination (i)	8.447 °
Longitude of the ascending node (Ω)	133.203°
Argument of perihelion (ω)	167.604°
Mean anomaly (M)	2.701°
Physical characteristics ^D
Dimensions	9.1 km
Mass
Density
Surface gravity
Escape velocity
Rotation period	4.80 h
Spectral class	S
Absolute magnitude	13.2
Albedo (geometric)	.140
Mean surface temperature
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1627 Ivar is a large Mars-crosser asteroid that was discovered in 1929 by Ejnar Hertzsprung at Johannesburg, South Africa. Although it does not cross Earth's orbit, during 1900-2100 it comes closer to the Earth with its 2074 pass at 21.1 Gm (0.141 AU) than it does to Mars (22.5 Gm or 0.150 AU in 1975).

[edit] References

Catchall Catalog of Minor Planets
NeoDys
JPL neo page, including orbit diagrams
telnet for JPL Horizons more comprehensive than web version
JPL Horizons web version

See also: List of asteroids

Minor planets
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For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.