4954 Eric

4954 Eric
	Shape model of Eric from its lightcurve
Discovery[1]
Discovered by	Brian P. Roman
Discovery site	Palomar Obs.
Discovery date	23 September 1990
Designations
MPC designation	(4954) Eric
Alternative designations	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)
Semi-major axis	2.0016 AU (299.44 Gm)
Eccentricity	0.44848
Orbital period	2.83 yr (1034.4 d)
Mean anomaly	314.18°
Mean motion	0° 20m 52.944s / day
Inclination	17.4461°
Longitude of ascending node	358.52°
Argument of perihelion	52.429°
Earth MOID	0.194843 AU (29.1481 Gm)
Physical characteristics
Dimensions	10.8 km
Mean radius	5.4 km
Rotation period	12.052[3] hours
Spectral type	S (SMASSII)
Absolute magnitude (H)	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.

Orbit diagram of 4954 Eric with location of object on 18 June 18 2013

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]

References

"(4954) Eric = 1990 SQ". Minor Planet Center. Retrieved 4 June 2015.
"JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 11 April 2013.
Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; Warner, B. D.; Pilcher, F.; 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 and Astrophysics. 551: 16. arXiv:1301.6943. Bibcode:2013A&A...551A..67H. doi:10.1051/0004-6361/201220701.
"JPL Close-Approach Data: 4954 Eric (1990 SQ)" (2012-09-04 last obs). Retrieved 30 October 2013.
Philip A. Bland; Elaine A. Moore; Ian Wright; Mike Widdowson (2004). An Introduction to the Solar System. Cambridge University Press. p. 394. ISBN 978-0-521-54620-1.

External links

4954 Eric at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
4954 Eric at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[MPC-object-1] "(4954) Eric = 1990 SQ". Minor Planet Center. Retrieved 4 June 2015.

[JPL-NEO-H13-2] "JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 11 April 2013.

[AAA551_A67-3] Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; Warner, B. D.; Pilcher, F.; 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 and Astrophysics. 551: 16. arXiv:1301.6943. Bibcode:2013A&A...551A..67H. doi:10.1051/0004-6361/201220701.

[jpl-close-4] "JPL Close-Approach Data: 4954 Eric (1990 SQ)" (2012-09-04 last obs). Retrieved 30 October 2013.

[5] Philip A. Bland; Elaine A. Moore; Ian Wright; Mike Widdowson (2004). An Introduction to the Solar System. Cambridge University Press. p. 394. ISBN 978-0-521-54620-1.