_Eric.png) Shape model of Eric from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | Brian P. Roman |
| Discovery site | Palomar Obs. |
| Discovery date | 23 September 1990 |
| Designations | |
| (4954) Eric | |
| 1990 SQ | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 14681 days (40.19 yr) |
| Aphelion | 2.8993 AU (433.73 Gm) |
| Perihelion | 1.10393 AU (165.146 Gm) |
| 2.0016 AU (299.44 Gm) | |
| Eccentricity | 0.44848 |
| 2.83 yr (1034.4 d) | |
| 314.18° | |
| 0° 20m 52.944s / day | |
| Inclination | 17.4461° |
| 358.52° | |
| 52.429° | |
| Earth MOID | 0.194843 AU (29.1481 Gm) |
| Physical characteristics | |
| Dimensions | 10.8 km |
| 5.4 km | |
| 12.052[3] hours | |
| S (SMASSII) | |
| 12.6 | |
4954 Eric (prov. designation: 1990 SQ) is an eccentric, stony asteroid, classified as near-Earth object of the Amor group, approximately 11 kilometers (6.8 miles) in diameter. It was discovered by American astronomer Brian Roman at Palomar Observatory on 23 September 1990.[4] The asteroid was named after its discoverer's son, Eric Roman.
It is the largest near-Earth asteroid discovered since 3552 Don Quixote in 1983.[2] On 2007 October 11 the asteroid passed 0.2865 AU (42,860,000 km; 26,630,000 mi) from Earth.[4] It currently makes closer approaches to Mars than it does Earth. The asteroid has a rotation period of 12.05 hours.[3]
Other large near-Earth asteroids include 1036 Ganymed (32 km), 3552 Don Quixote (19 km), 433 Eros (17 km), and 1866 Sisyphus (8.5 km).[2][5]
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