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28 Bellona (A854 EA)
Classification: Main-belt Asteroid          SPK-ID: 2000028
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 110 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1516839643613372 2.9908e-08  
a 2.775723899998531 4.783e-09 au
q 2.354691094874242 8.3561e-08 au
i 9.43044011873261 3.5408e-06 deg
node 144.2870823627363 1.5874e-05 deg
peri 343.9596234750768 1.8374e-05 deg
M 41.42652151833448 1.0169e-05 deg
tp 2459006.125722717724
(2020-Jun-05.62572272)
4.7526e-05 TDB
period 1689.129023074025
4.62
4.3659e-06
1.195e-08
d
yr
n .2131275912510464 5.5087e-10 deg/d
Q 3.19675670512282 5.5084e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3022  
   data-arc span      60044 days (164.39 yr)  
   first obs. used      1856-09-29  
   last obs. used      2021-02-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54041  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:44:41  

Additional Information
 Earth MOID = 1.37089 au 
 Jupiter MOID = 1.85702 au 
 T_jup = 3.299 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452922.5 (2003-Oct-10.0) TDB
Reference: JPL 110 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1488844185091531 2.9534e-08  
q 2.364669778119967 8.1947e-08 au
tp 2452236.269458819340
(2001-Nov-22.76945882)
4.5048e-05 TDB
node 144.5147257799851 1.5942e-05 deg
peri 342.4228916170769 1.8519e-05 deg
i 9.402005926895377 3.5318e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3022  
   data-arc span      60044 days (164.39 yr)  
   first obs. used      1856-09-29  
   last obs. used      2021-02-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54041  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:44:41  

Additional Information
 Jupiter MOID = 1.85702 au 
 T_jup = 3.299 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.72277537964194E-16 -2.417337409709713E-15 3.492225198861893E-13 4.250648303291644E-15 6.709933319661077E-14 -1.568763374393486E-16
q -2.417337409709713E-15 6.715327772489838E-15 -9.473157226638467E-13 -1.181117874469516E-14 -1.805822312499604E-13 5.596786281751226E-16
tp 3.492225198861893E-13 -9.473157226638467E-13 2.029302046821761E-9 3.689321683361341E-13 4.306243898073116E-10 4.714376857629267E-13
node 4.250648303291644E-15 -1.181117874469516E-14 3.689321683361341E-13 2.541628574586436E-10 -2.504326117464907E-10 7.553964817895744E-12
peri 6.709933319661077E-14 -1.805822312499604E-13 4.306243898073116E-10 -2.504326117464907E-10 3.429470564705171E-10 -7.407185582258389E-12
i -1.568763374393486E-16 5.596786281751226E-16 4.714376857629267E-13 7.553964817895744E-12 -7.407185582258389E-12 1.247327596873163E-11

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 7.24   n/a E2021B10 IRAS observations used: 18
diameter diameter 120.90 km 3.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
rotation period rot_per 15.706 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2007) Minor Planet Bull. 34, 104-107.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Pilcher, F. (2011) Minor Planet Bull. 38, 156-158.]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[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 0.1763   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
B-V BV 0.845   0.010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=1.74, mean=10.22, max.=22.69) deg.
U-B UB 0.469   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=14.00, mean=17.13, max.=22.69) 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)

28 Bellona (A854 EA)          Discovered 1854-Mar-01 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A854 EA = 1951 CC2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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