4954 Eric

4954 Eric
	Shape model of Eric from its lightcurve
Discovery
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
	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 (sidereal)	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
Synodic rotation period	12.052 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 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.
1 2 3 "JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 11 April 2013.
1 2 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. S2CID 118627434.
1 2 "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
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
4954 Eric at the JPL Small-Body Database

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

[JPL-NEO-H13-2] 1 2 3 "JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 11 April 2013.

[AAA551_A67-3] 1 2 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. S2CID 118627434.

[jpl-close-4] 1 2 "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.

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