1862 Apollo
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Discovery
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| Discovered by | Karl Reinmuth |
| Discovery date | April 24, 1932 |
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Designations
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| Named after | Apollo |
| Alternate name(s) | 1932 HA |
| Minor planet category |
Apollo  Venus-crosser asteroid, Mars-crosser asteroid |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 343.216 Gm (2.294 AU) |
| Perihelion | 96.850 Gm (0.647 AU) |
| Semi-major axis | 220.033 Gm (1.471 AU) |
| Eccentricity | 0.560 |
| Orbital period | 651.543 d (1.78 a) |
| Average orbital speed | 22.50 km/s |
| Mean anomaly | 38.337° |
| Inclination | 6.355° |
| Longitude of ascending node | 35.777° |
| Argument of perihelion | 285.784° |
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Physical characteristics
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| Dimensions | 1.7 km |
| Mass | 5.1×1012? kg |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | 0.0005? m/s² |
| Escape velocity | 0.0009? km/s |
| Rotation period | 0.1277265 d (3.065436 h) |
| Albedo | 0.21 [1] |
| Temperature | ~222 K |
| Spectral type | Q |
| Absolute magnitude (H) | 16.25 |
1862 Apollo (
/əˈpɒloʊ/) is a Q-type asteroid, discovered by Karl Reinmuth in 1932, but lost and not recovered until 1973. It is named after the Greek god Apollo.
It is the namesake of the Apollo asteroids, and the first one discovered, although because it was lost for a time its asteroid number (1862) is higher than that of some other Apollo asteroids such as 1566 Icarus. Analysis of the spin of this object provided observational evidence of the YORP effect.
It was the first asteroid recognized to cross Earth's orbit. It is also a Venus- and Mars-crosser asteroid.
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[edit] Moon
On November 4, 2005, it was announced that an asteroid moon, or satellite of Apollo, had been detected by radar observations from Arecibo Observatory, Puerto Rico, October 29 – November 2, 2005. The standard provisional designation for this satellite is S/2005 (1862) 1. The announcement is contained in the International Astronomical Union Circular (IAUC) 8627 [2]. The satellite is just 80 m across and orbits Apollo closely, in an orbit a mere 3 km in radius [3].
[edit] Further reading
- Durech, J.; Vokrouhlický, D.; Kaasalainen, M.; Weissman, P.; Lowry, S. C.; Beshore, E.; Higgins, D.; Krugly, Y. N. et al. (September 2008). "New photometric observations of asteroids (1862) Apollo and (25143) Itokawa – an analysis of YORP effect". Astronomy and Astrophysics 488 (1): 345–350. Bibcode 2008A&A...488..345D. doi:10.1051/0004-6361:200809663. http://www.rni.helsinki.fi/~mjk/YorpApoIto.pdf.
[edit] See also
[edit] External links
- (1862) Apollo in the Minor Planet Center's Database
- NASA JPL orbital simulation 1862 Apollo (Java)
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