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JPL Small-Body Database Browser
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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 452 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4493837521459633 3.103e-08  
a 2.000855357844555 4.3184e-09 au
q 1.101703469635015 6.181e-08 au
i 17.42944102921627 6.225e-06 deg
node 358.443609176273 1.0726e-05 deg
peri 52.58954719863921 1.2166e-05 deg
M 150.9533898540223 7.1813e-06 deg
tp 2458567.026713982191
(2019-Mar-24.52671398)
1.9436e-05 TDB
period 1033.765343841021
2.83
3.3468e-06
9.163e-09
d
yr
n .3482415058163945 1.1274e-09 deg/d
Q 2.900007246054095 6.2591e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2606  
   data-arc span      16365 days (44.80 yr)  
   first obs. used      1975-06-07  
   last obs. used      2020-03-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41328  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-28 06:14:22  

Additional Information
 Earth MOID = .194663 au 
 Jupiter MOID = 2.70097 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 12.5   n/a MPO416765  
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. 2019-August); 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.]
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

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