1627 Ivar
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| Discovery | |
|---|---|
| Discovered by | Ejnar Hertzsprung |
| Discovery date | September 25, 1929 |
| Designations | |
| Alternative names | 1929 SH; 1957 NA; 1957 XA |
| Minor planet category | Amor, Mars crosser |
| Orbital characteristics | |
| 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° |
| Physical characteristics | |
| Dimensions | 9.1 km |
| Rotation period | 4.80 h |
| Albedo | .140 |
| Spectral type | S |
| Absolute magnitude (H) | 13.2 |
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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).
In 1985, this object was detected with radar from the Arecibo Observatory at a distance of 0.20 AU. The measured radar cross-section was 7.5 km2.[1]
References
- ↑ Ostro, S. J. et al. (October 1991), "Asteroid radar astrometry", Astronomical Journal 102: 1490–1502, Bibcode:1991AJ....102.1490O, doi:10.1086/115975.
External links
- telnet for JPL Horizons more comprehensive than web version
- JPL Horizons web version
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