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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06481282727176914 3.362e-08  
a 1.5235385961208 2.6574e-09 au
q 1.424793752248549 5.2091e-08 au
i 20.28235595639164 4.9124e-06 deg
node 245.0410184963105 8.9112e-06 deg
peri 95.50200047251583 4.6291e-05 deg
M 263.8388129424268 4.7561e-05 deg
tp 2459183.974593041557
(2020-Nov-30.47459304)
9.103e-05 TDB
period 686.8764364921454
1.88
1.7971e-06
4.92e-09
d
yr
n .5241117337472045 1.3713e-09 deg/d
Q 1.622283439993051 2.8297e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1403  
   data-arc span      14942 days (40.91 yr)  
   first obs. used      1979-11-21  
   last obs. used      2020-10-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41645  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:44:51  

Additional Information
 Earth MOID = .498303 au 
 Jupiter MOID = 3.52628 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 16.1   n/a PDS3 (MPC 28113)  
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. 2019-August); 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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