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322 Phaeo (A891 WB)
Classification: Main-belt Asteroid          SPK-ID: 2000322
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2456532186251393 3.5485e-08  
a 2.783240405537247 6.4794e-09 au
q 2.099528441709484 9.9597e-08 au
i 8.051712851109317 3.9704e-06 deg
node 252.3675077623158 2.9074e-05 deg
peri 114.7307564918821 3.0056e-05 deg
M 280.8036282465644 8.5279e-06 deg
tp 2459373.601755644135
(2021-Jun-08.10175564)
4.0836e-05 TDB
period 1695.994766654974
4.64
5.9224e-06
1.621e-08
d
yr
n .2122648059286358 7.4123e-10 deg/d
Q 3.46695236936501 8.0711e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2756  
   data-arc span      47000 days (128.68 yr)  
   first obs. used      1891-12-01  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4248  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:14:13  

Additional Information
 Earth MOID = 1.11417 au 
 Jupiter MOID = 2.09683 au 
 T_jup = 3.273 
[ 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 9.1   n/a MPO492752 IRAS observations used: 24
diameter diameter 69.855 km 0.320 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 17.5845 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Lagerkvist, C.-I.; Bel'skaya, I.; Erikson, A.; Schevchenko, V.; et al. (1998) Astron. Astrophys. Suppl. Ser. 131, 55-62.]
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Sheridan, E.E. (2003) Minor Planet Bull. 30, 28.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.089   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.719   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=16.31, mean=20.99, max.=25.66) deg.
U-B UB 0.230   0.043 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=16.31, mean=20.99, max.=25.66) deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B X   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)

322 Phaeo (A891 WB)          Discovered 1891-Nov-27 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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