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JPL Small-Body Database Browser
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15 Eunomia
Classification: Main-belt Asteroid          SPK-ID: 2000015
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1860843620330185 2.7159e-08  
a 2.644100304490733 3.639e-09 au
q 2.152074586178265 7.1339e-08 au
i 11.75242982472844 2.543e-06 deg
node 292.9343386609643 1.4051e-05 deg
peri 98.49868083964806 1.5697e-05 deg
M 283.3876976906251 7.6281e-06 deg
tp 2458934.703758004643
(2020-Mar-26.20375800)
3.364e-05 TDB
period 1570.418186831449
4.30
3.242e-06
8.876e-09
d
yr
n .2292383029047525 4.7324e-10 deg/d
Q 3.136126022803201 4.3162e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2501  
   data-arc span      61247 days (167.69 yr)  
   first obs. used      1851-09-02  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54579  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:01:49  

Additional Information
 Earth MOID = 1.19485 au 
 Jupiter MOID = 2.41808 au 
 T_jup = 3.339 
[ hide covariance matrix ]
Orbital Elements at Epoch 2451157.5 (1998-Dec-10.0) TDB
Reference: JPL 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1863835382322878 2.6889e-08  
q 2.150674289170545 7.0609e-08 au
tp 2451077.444450351557
(1998-Sep-20.94445035)
2.7743e-05 TDB
node 293.5204609387022 1.4071e-05 deg
peri 96.87602967333571 1.5731e-05 deg
i 11.74871057595645 2.5376e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2501  
   data-arc span      61247 days (167.69 yr)  
   first obs. used      1851-09-02  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54579  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:01:49  

Additional Information
 Jupiter MOID = 2.41808 au 
 T_jup = 3.339 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.230071622944302E-16 -1.897092825813737E-15 1.904989681650617E-13 -4.859347296879075E-15 5.602516051231473E-14 -3.161674563322563E-15
q -1.897092825813737E-15 4.985636663019301E-15 -4.877879485445298E-13 1.1969880908637E-14 -1.432478870681457E-13 8.383602432664813E-15
tp 1.904989681650617E-13 -4.877879485445298E-13 7.696893415179899E-10 -3.312318568855995E-12 2.045357954512046E-10 -1.293896782781506E-12
node -4.859347296879075E-15 1.1969880908637E-14 -3.312318568855995E-12 1.979902323226985E-10 -1.945497420913675E-10 -8.065669685611863E-12
peri 5.602516051231473E-14 -1.432478870681457E-13 2.045357954512046E-10 -1.945497420913675E-10 2.47478305806343E-10 7.568267085730777E-12
i -3.161674563322563E-15 8.383602432664813E-15 -1.293896782781506E-12 -8.065669685611863E-12 7.568267085730777E-12 6.439342564129898E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 5.28   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 231.689 km 2.234 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.083 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.]
[Cailliate, C. (1956) Publ. Observ. Lyon 3, fasc. 28.]
[Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. J. 127, 253-273.]
[Cailliate, C. (1960) Bull. Astronomique XXIII, fasc. III.]
[Scaltriti, F.; Zappala, V. (1975) Astron. Astrophys. Suppl. Ser. 19, 249-255.]
[Chang, Y.C.; Zhou, X.-h.; Yang, X.-y.; Zhang, Y.-y.; et al. (1981) Acta Astron. Sin. 22, 169-173; Chin. Astron. Astrophys. 5, 434-437.]
[Lupishko, D.F.; Belskaja, I.N.; Velichko, F.P. (1985) Vestn. Kharkov Univ. 278, 51-56.]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Melillo, F.J. (1986) Minor Planet Bull. 13, 21-22.]
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1989) Astron. Astrophys. Suppl. Ser. 78, 519-532.]
[Magnusson, P. (1990) Icarus 85, 229-240.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.]
[De Angelis, G. (1992) in Physical properties of small solar system bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 195-201.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.]
[Nathues, A.; Mottola, S.; Kaasalainen, M.; Neukum, G. (2005) Icarus 175, 452-463.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
geometric albedo albedo 0.248   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.839   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=23; phase (min.=3.66, mean=16.49, max.=25.91) deg.
U-B UB 0.451   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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