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5261 Eureka (1990 MB)
Classification: Mars-crossing Asteroid          SPK-ID: 2005261
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06473226137602331 1.3852e-08  
a 1.523519689230185 2.0866e-09 au
q 1.424898814495418 2.1108e-08 au
i 20.28076986432268 5.0215e-07 deg
node 245.0353978240619 1.9747e-06 deg
peri 95.42954329105918 1.3556e-05 deg
M 8.727892669893144 1.4643e-05 deg
tp 2459183.847577166047
(2020-Nov-30.34757717)
2.7924e-05 TDB
period 686.8636504780007
1.88
1.4111e-06
3.863e-09
d
yr
n .5241214901232137 1.0767e-09 deg/d
Q 1.622140563964951 2.2216e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1518  
   data-arc span      15059 days (41.23 yr)  
   first obs. used      1979-11-21  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41704  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 17:20:05  

Additional Information
 Earth MOID = .496594 au 
 Jupiter MOID = 3.52504 au 
 T_jup = 4.428 
[ 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 16.13   n/a E2021B10  
diameter diameter 1.878 km 0.231 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 2.6902 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Koehn, B.W.; Bowell, E.L.G.; Skiff, B.A.; Sanborn, J.J.; et al. (2014) Minor Planet Bull. 41, 286-300.]
geometric albedo albedo 0.182   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
SMASSII spectral type spec_B Sr   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)

5261 Eureka (1990 MB)          Discovered 1990-Jun-20 by Holt and Levy 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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