4954 Eric

From Wikipedia, the free encyclopedia
Jump to: navigation, search
4954 Eric
Eric June 18 2013.gif
Orbit diagram of 4954 Eric with location of object on June 18, 2013
Discovery[1]
Discovery date 23 September 1990
Designations
MPC designation (1990) SQ
MPO 328722
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)
Jupiter MOID 2.70197 AU (404.209 Gm)
Jupiter Tisserand parameter 3.657
Physical characteristics
Dimensions 10.8 km
Mean radius
5.4 km
12.052[3] hours
B-type asteroid[4]
12.6

4954 Eric (or 1990 SQ) is an Amor asteroid with a diameter of 10.8 km that was discovered by American astronomer Brian P. Roman on 1990 September 23.[5] It was named after its discoverer's son, Eric Roman. The asteroid has a rotation period of 12.05 hours.[3]

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.[5] It currently makes closer approaches to Mars than it does Earth.

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][6]

References[edit]

  1. ^ "(4954) Eric = 1990 SQ". Minor Planet Center. Retrieved 2015-06-04. 
  2. ^ a b c "JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 2013-04-11. 
  3. ^ a b Hanuš, J.; et al. (March 2013), "Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution", Astronomy & Astrophysics, 551: A67, arXiv:1301.6943Freely accessible, Bibcode:2013A&A...551A..67H, doi:10.1051/0004-6361/201220701. 
  4. ^ based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)
  5. ^ a b "JPL Close-Approach Data: 4954 Eric (1990 SQ)" (2012-09-04 last obs). Retrieved 2013-10-30. 
  6. ^ N. McBride and I. Gilmour - An Introduction to the Solar System (2004) - Page 394

External links[edit]