1627 Ivar
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| 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 | |
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| 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
- NeoDys
- NASA JPL Small-Body Database Browser on 1627 Ivar
- telnet for JPL Horizons more comprehensive than web version
- JPL Horizons web version
See also: List of asteroids
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