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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457203.5 (2015-Jun-30.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06483423301977979 1.3858e-08  
q 1.424728150119112 2.1116e-08 au
tp 2457123.258791786706
(2015-Apr-10.75879179)
2.6476e-05 TDB
node 245.058830058264 1.9747e-06 deg
peri 95.43206202903089 1.3532e-05 deg
i 20.28026346113776 5.0211e-07 deg
  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
 Jupiter MOID = 3.52504 au 
 T_jup = 4.428 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.92036240005109E-16 -2.913765625010193E-16 1.20284511960654E-13 -9.948744059632246E-15 6.031759518524779E-14 3.451283776411206E-15
q -2.913765625010193E-16 4.458894449326778E-16 -1.696950802077655E-13 1.482708212046554E-14 -8.475306815390059E-14 -5.198971816186182E-15
tp 1.20284511960654E-13 -1.696950802077655E-13 7.009857649036956E-10 -3.289690627660051E-11 3.562609328875912E-10 5.019494159743685E-13
node -9.948744059632246E-15 1.482708212046554E-14 -3.289690627660051E-11 3.899281895710527E-12 -1.874924791920442E-11 -3.292310055968236E-13
peri 6.031759518524779E-14 -8.475306815390059E-14 3.562609328875912E-10 -1.874924791920442E-11 1.831118659302222E-10 4.55466906271994E-13
i 3.451283776411206E-15 -5.198971816186182E-15 5.019494159743685E-13 -3.292310055968236E-13 4.55466906271994E-13 2.521115583751709E-13

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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