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15 Eunomia
Classification: Main-belt Asteroid          SPK-ID: 2000015
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 70 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1874594163786241 2.8243e-08  
a 2.643914763022448 3.2364e-09 AU
q 2.148288044591431 7.4511e-08 AU
i 11.73888056430162 2.5893e-06 deg
node 293.1871147204334 1.4852e-05 deg
peri 97.55418277946094 1.6325e-05 deg
M 277.5295198859401 7.0031e-06 deg
tp 2457360.220860604345
(2015-Dec-03.72086060)
3.0865e-05 JED
period 1570.25289095518
4.30
2.8832e-06
7.894e-09
d
yr
n .2292624341427024 4.2095e-10 deg/d
Q 3.139541481453464 3.843e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2075  
   data-arc span      59109 days (161.83 yr)  
   first obs. used      1851-09-02  
   last obs. used      2013-07-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .64363  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2013-Jul-16 08:46:58  

Additional Information
 Earth MOID = 1.19136 AU 
 T_jup = 3.339 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 5.28 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
magnitude slope G 0.23   n/a PDS3 (MPC 17257) Fit
diameter diameter 255.33 km 15.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
rotation period rot_per 6.083 h n/a LCDB (Rev. 2015-July); Warner et al., 2009  
geometric albedo albedo 0.2094   0.027 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
B-V BV .839 mag .015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=23; phase (min.=3.66, mean=16.49, max.=25.91) deg.
U-B UB .451 mag .019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=15; phase (min.=6.04, mean=19.34, max.=25.91) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
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)

15 Eunomia          Discovered 1851-Jul-29 by De Gasparis, A. at Naples
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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