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221 Eos (A882 BA)
Classification: Main-belt Asteroid          SPK-ID: 2000221
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1027386723707902 3.9305e-08  
a 3.010861705429142 1.1311e-08 au
q 2.701529771121298 1.2035e-07 au
i 10.8928773812878 4.3577e-06 deg
node 141.7312811819251 2.2181e-05 deg
peri 192.3004596001574 3.0263e-05 deg
M 9.667188957880864 2.1022e-05 deg
tp 2459149.257259788726
(2020-Oct-26.75725979)
0.00011138 TDB
period 1908.247222272416
5.22
1.0753e-05
2.944e-08
d
yr
n .1886548010122597 1.0631e-09 deg/d
Q 3.320193639736984 1.2473e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3113  
   data-arc span      49390 days (135.22 yr)  
   first obs. used      1885-10-29  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43663  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:03:42  

Additional Information
 Earth MOID = 1.69006 au 
 Jupiter MOID = 2.03526 au 
 T_jup = 3.214 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456150.5 (2012-Aug-11.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1049557457020347 3.8948e-08  
q 2.692823171261242 1.1942e-07 au
tp 2455344.254267401416
(2010-May-27.75426740)
0.00010943 TDB
node 141.8627307747222 2.2236e-05 deg
peri 194.1506395169264 3.0163e-05 deg
i 10.88183225404716 4.3538e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3113  
   data-arc span      49390 days (135.22 yr)  
   first obs. used      1885-10-29  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43663  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:03:42  

Additional Information
 Jupiter MOID = 2.03526 au 
 T_jup = 3.214 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.516951120093195E-15 -4.635500692746814E-15 -2.377743784446595E-13 3.709225893207967E-15 -4.250732283758067E-14 -1.323779836831098E-16
q -4.635500692746814E-15 1.426051272119729E-14 6.260034875861848E-13 -1.21180237464017E-14 1.183146826968454E-13 1.254829943925576E-15
tp -2.377743784446595E-13 6.260034875861848E-13 1.197513032609756E-8 -1.625024638425614E-11 2.252358771152648E-9 2.410599267115513E-12
node 3.709225893207967E-15 -1.21180237464017E-14 -1.625024638425614E-11 4.944209260241691E-10 -4.881400571107392E-10 -5.164040603326518E-12
peri -4.250732283758067E-14 1.183146826968454E-13 2.252358771152648E-9 -4.881400571107392E-10 9.097933596622281E-10 5.668380792875771E-12
i -1.323779836831098E-16 1.254829943925576E-15 2.410599267115513E-12 -5.164040603326518E-12 5.668380792875771E-12 1.895576938832022E-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 7.79   n/a E2021B10 IRAS observations used: 15
magnitude slope G 0.13   n/a PDS3 (MPC 17258) Fit
diameter diameter 95.469 km 1.684 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 10.443 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.]
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2013) Minor Planet Bull. 40, 158-160.]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2016) Astron. Astrophys., submitted.]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2018) Icarus 299, 84-96.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.166   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.768   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.96, mean=8.64, max.=12.71) deg.
U-B UB 0.410   0.062 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.96, mean=8.64, max.=12.71) 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 K   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)

221 Eos (A882 BA)          Discovered 1882-Jan-18 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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