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171 Ophelia (A877 AB)
Classification: Main-belt Asteroid          SPK-ID: 2000171
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 113 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1320473926945787 1.3759e-08  
a 3.130117390500918 9.569e-09 au
q 2.716793550257314 4.4171e-08 au
i 2.546747048292787 2.9847e-07 deg
node 100.4767613337558 5.199e-06 deg
peri 55.98165178895664 6.4594e-06 deg
M 261.2654577754392 2.4716e-06 deg
tp 2459555.261075180097
(2021-Dec-06.76107518)
1.4417e-05 TDB
period 2022.73675012953
5.54
9.2755e-06
2.539e-08
d
yr
n .1779766941876874 8.1613e-10 deg/d
Q 3.543441230744523 1.0833e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2952  
   data-arc span      12804 days (35.06 yr)  
   first obs. used      1985-08-15  
   last obs. used      2020-09-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36532  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Sep-16 12:00:26  

Additional Information
 Earth MOID = 1.72752 au 
 Jupiter MOID = 1.44544 au 
 T_jup = 3.198 
[ show covariance matrix ]

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 8.6   n/a MPO502154 IRAS observations used: 10
diameter diameter 130.808 km 1.483 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.66535 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (1977) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Oey, J. (2006) Minor Planet Bull. 33, 96-99.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Wang, X.; Muinonen, K.; Wang, Y.; Behrend, R.; et al. (2015) Astron. Astrophys. 581, A55.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.076   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.695   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.86, mean=10.12, max.=13.28) deg.
U-B UB 0.341   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=2.86, mean=10.58, max.=13.28) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   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)

171 Ophelia (A877 AB)          Discovered 1877-Jan-13 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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