| Discovery A | |
|---|---|
| Discoverer | Miklós Lovas |
| Discovery date | January 20, 1982 |
| Alternate designations B | 1982 BB |
| Category | Apollo, Mars crosser |
| Orbital elements C | |
| | |
| Eccentricity (e) | .354 |
| Semi-major axis (a) | 210.158 Gm (1.405 AU) |
| Perihelion (q) | 135.672 Gm (0.907 AU) |
| Aphelion (Q) | 284.640 Gm (1.903 AU) |
| Orbital period (P) | 608.208 d 1.665 a |
| Mean orbital speed | 40.496 km/s |
| Inclination (i) | 20.931° |
| Longitude of the ascending node (Ω) | 129.834° |
| Argument of perihelion (ω) | 253.967° |
| Mean anomaly (M) | 55.517° |
| Physical characteristics D | |
| Diameter | km |
| Mass | |
| Density | |
| Surface gravity | |
| Escape velocity | |
| Rotation period | h |
| Spectral class | E |
| Absolute magnitude | 15.0 |
| Albedo (geometric) | .53 |
| Mean surface temperature | |
3103 Eger is an Apollo and Mars-crosser asteroid that was discovered in 1982, by Miklós Lovas. It was named after the city of Eger, Hungary.
It makes eight approaches to Earth less than 30 Gm (0.2 AU) in the 20th and 21st centuries. The last close approach was in August 2006 at 19.2 Gm (0.13 AU). The next is in August 2011 at 22.9 Gm (0.15 AU).
Interestingly, 3103 Eger is the only asteroid besides 4 Vesta identified as the parent body for specific meteorites. 4 Vesta is the parent body for Howardite, Eucrite, and Diogenite meteorites, while 3103 Eger is the parent body for Aubrite meteorites. In this characteristic 3103 Eger is related spectroscopically to the 434 Hungaria type asteroids, which are a Hirayama-family of orbital types, and E-type asteroids which form a spectroscopical type.
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