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Discovery
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| Discovered by | Ejnar Hertzsprung |
| Discovery date | September 25, 1929 |
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Designations
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| Alternate name(s) | 1929 SH; 1957 NA; 1957 XA |
| Minor planet category |
Amor, Mars crosser |
| Epoch November 26, 2005 (JD 2453700.5 ) | |
| Aphelion | 389.340 Gm (2.603 AU) |
| Perihelion | 168.152 Gm, (1.124 AU) |
| Semi-major axis | 278.746 Gm (1.863 AU) |
| Eccentricity | 0.397 |
| Orbital period | 929.016 d, (2.544 a) |
| Average orbital speed | 20.934 km/s |
| Mean anomaly | 2.701° |
| Inclination | 8.447 ° |
| Longitude of ascending node | 133.203° |
| Argument of perihelion | 167.604° |
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Physical characteristics
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| Dimensions | 9.1 km |
| Rotation period | 4.80 h |
| Albedo | .140 |
| Spectral type | S |
| Absolute magnitude (H) | 13.2 |
1627 Ivar is a large Mars-crosser asteroid that was discovered in 1929 by Ejnar Hertzsprung at the Union Observatory in 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).
See also: List of asteroids
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