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JPL Small-Body Database Browser
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185 Eunike
Classification: Main-belt Asteroid          SPK-ID: 2000185
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1284428929294858 3.3446e-08  
a 2.739787275704732 7.2341e-09 au
q 2.387881072001821 9.1046e-08 au
i 23.23850014955452 4.0833e-06 deg
node 153.7831709971248 9.3498e-06 deg
peri 223.4859823814803 1.8477e-05 deg
M 272.6385173000503 1.7623e-05 deg
tp 2459402.467729657886
(2021-Jul-06.96772966)
8.1934e-05 TDB
period 1656.432310951634
4.54
6.5604e-06
1.796e-08
d
yr
n .2173345675641747 8.6077e-10 deg/d
Q 3.091693479407642 8.1632e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3174  
   data-arc span      49507 days (135.54 yr)  
   first obs. used      1884-07-12  
   last obs. used      2020-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41775  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:20:15  

Additional Information
 Earth MOID = 1.42111 au 
 Jupiter MOID = 2.41478 au 
 T_jup = 3.222 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.7   n/a MPO492750 IRAS observations used: 23
diameter diameter 160.464 km 2.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 21.797 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F.; Ruthroff, J.C. (2012) Minor Planet Bull. 39, 13.]
[Hills, K. (2013) Minor Planet Bull. 40, 89-90.]
[Pilcher, F.; Behrend, R.; Bernasconi, L.; Franco, L.; Hills, K.; et al. (2014) Minor Planet Bull. 41, 244-250.]
geometric albedo albedo 0.062   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.668   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=18.02, mean=21.23, max.=23.82) deg.
U-B UB 0.331   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=18.02, mean=21.23, max.=23.82) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B C   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)

185 Eunike          Discovered 1878-Mar-01 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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