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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455997.5 (2012-Mar-11.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2455302129922621 3.5608e-08  
q 2.09937320795057 9.9734e-08 au
tp 2455988.638701053214
(2012-Mar-02.13870105)
3.6756e-05 TDB
node 252.3859844050653 2.9066e-05 deg
peri 115.5415323286522 3.0043e-05 deg
i 8.052523287952479 3.9715e-06 deg
  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
 Jupiter MOID = 2.09683 au 
 T_jup = 3.273 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.267909620834866E-15 -3.546978043977896E-15 -9.917819669224495E-14 8.478588566621724E-16 -1.183499845306362E-14 -1.872406258854031E-15
q -3.546978043977896E-15 9.946795275270458E-15 2.960595321055295E-13 -2.272970496494124E-15 3.533926394616594E-14 5.118825873258524E-15
tp -9.917819669224495E-14 2.960595321055295E-13 1.350990521818862E-9 -3.952857567527236E-12 3.00294525298095E-10 -2.653383731273273E-13
node 8.478588566621724E-16 -2.272970496494124E-15 -3.952857567527236E-12 8.448307965209884E-10 -8.367842733221165E-10 3.950746829256644E-13
peri -1.183499845306362E-14 3.533926394616594E-14 3.00294525298095E-10 -8.367842733221165E-10 9.025653582085271E-10 -4.114173332349907E-13
i -1.872406258854031E-15 5.118825873258524E-15 -2.653383731273273E-13 3.950746829256644E-13 -4.114173332349907E-13 1.577276043896527E-11

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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