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65 Cybele (A861 EB)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000065
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1120460120270747 3.2389e-08  
a 3.42483772480515 9.4294e-09 au
q 3.041098315900853 1.1162e-07 au
i 3.564035517145046 3.7988e-06 deg
node 155.6183998525847 5.5625e-05 deg
peri 102.8303080522308 5.7883e-05 deg
M 323.0142324109846 1.7146e-05 deg
tp 2459238.343101988297
(2021-Jan-23.84310199)
0.00011074 TDB
period 2315.039602996284
6.34
9.5608e-06
2.618e-08
d
yr
n .1555048991533722 6.4221e-10 deg/d
Q 3.808577133709448 1.0486e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3870  
   data-arc span      58162 days (159.24 yr)  
   first obs. used      1861-03-12  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45332  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:06:22  

Additional Information
 Earth MOID = 2.02868 au 
 Jupiter MOID = 1.25999 au 
 T_jup = 3.129 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454088.5 (2006-Dec-19.0) TDB
Reference: JPL 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1050275084633059 3.3701e-08  
q 3.072628303941247 1.1615e-07 au
tp 2454618.879878438276
(2008-Jun-01.37987844)
0.00010618 TDB
node 155.807834647503 5.5895e-05 deg
peri 105.7544922107669 5.8283e-05 deg
i 3.548471292419774 3.7923e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3870  
   data-arc span      58162 days (159.24 yr)  
   first obs. used      1861-03-12  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45332  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:06:22  

Additional Information
 Jupiter MOID = 1.25999 au 
 T_jup = 3.129 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.135723719726146E-15 -3.904463520003318E-15 8.237317896280192E-13 7.877740260633155E-16 1.212122737678789E-13 3.761391575284031E-16
q -3.904463520003318E-15 1.349167281003435E-14 -2.705866506725777E-12 -1.876324721892464E-15 -4.013775623385242E-13 -1.283798136417066E-15
tp 8.237317896280192E-13 -2.705866506725777E-12 1.127476491991957E-8 -5.368701279405448E-13 1.771155673665852E-9 2.924209033549258E-13
node 7.877740260633155E-16 -1.876324721892464E-15 -5.368701279405448E-13 3.124233530010022E-9 -3.118082004604799E-9 -5.257483694890724E-11
peri 1.212122737678789E-13 -4.013775623385242E-13 1.771155673665852E-9 -3.118082004604799E-9 3.396850375063709E-9 5.249346011104957E-11
i 3.761391575284031E-16 -1.283798136417066E-15 2.924209033549258E-13 -5.257483694890724E-11 5.249346011104957E-11 1.438141434169066E-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 6.8   n/a MPO473761 IRAS observations used: 17
magnitude slope G 0.01   n/a PDS3 (MPC 17257) Fit
diameter diameter 237.26 km 4.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
rotation period rot_per 6.0814 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Scaltriti, F.; Zappala, V.; Harris, A.W. (1980) Astron. Astrophys. 91, 1-6.]
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2009) 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.; Stephens, R.D. (2010) Minor Planet Bull. 37, 8.]
[Pilcher, F. (2012) Minor Planet Bull. 39, 57-60.]
[Pilcher, F. (2014) Minor Planet Bull. 41, 250-252.]
[Franco, L.; Pilcher, F. (2015) Minor Planet Bull. 42, 204-206.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
geometric albedo albedo 0.0706   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
B-V BV 0.690   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=17; phase (min.=1.75, mean=10.38, max.=18.00) deg.
U-B UB 0.271   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=1.75, mean=4.51, max.=10.04) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   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)

65 Cybele (A861 EB)          Discovered 1861-Mar-08 by Tempel, E. W. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A861 EB = 1949 YQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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