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4954 Eric (1990 SQ)
Classification: Amor [NEO]          SPK-ID: 2004954
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 510 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4493198620269856 1.8104e-08  
a 2.00095784248719 3.9546e-09 au
q 1.101887740779031 3.6589e-08 au
i 17.42882575921403 4.1871e-07 deg
node 358.439727274738 3.7976e-06 deg
peri 52.57924500111029 2.8844e-06 deg
M 220.6303992751508 6.5047e-06 deg
tp 2459600.740368787975
(2022-Jan-21.24036879)
1.9787e-05 TDB
period 1033.844769693601
2.83
3.0648e-06
8.391e-09
d
yr
n .3482147519174397 1.0323e-09 deg/d
Q 2.900027944195349 5.7314e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2926  
   data-arc span      16805 days (46.01 yr)  
   first obs. used      1975-06-07  
   last obs. used      2021-06-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40523  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jun-11 05:50:17  

Additional Information
 Earth MOID = .193716 au 
 Jupiter MOID = 2.70199 au 
 T_jup = 3.658 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.58   n/a E2021B10  
diameter diameter 10.8 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 12.056 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Krugly, Yu.N.; Shevchenko, V.G. (1994) Abstracts of Small Bodies Conf.; Mariehamn, p. 86.]
[Pravec, P.; Wolf, M.; Varady, M.; Barta, P. (1995) Earth, Moon, and Planets 71, 177-187.]
[Zeigler, K.W.; Monsees, R.D.; Brown, L. (1998) Minor Planet Bull. 25, 13-14.]
[Warner, B.D (2011) Minor Planet Bull. 38, 25-31.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
[Warner, B.D. (2014) Minor Planet Bull. 41, 157-168.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.176   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4954 Eric (1990 SQ)          Discovered 1990-Sep-23 by Roman, B. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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