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86 Semele (A866 AA)
Classification: Main-belt Asteroid          SPK-ID: 2000086
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2154787781925476 2.2823e-08  
a 3.106697877848517 8.1059e-09 au
q 2.437270414916338 6.8829e-08 au
i 4.820249150539165 2.6859e-07 deg
node 86.08677300477883 1.4521e-05 deg
peri 308.8664912459514 1.696e-05 deg
M 135.1442398822928 6.5409e-06 deg
tp 2458645.669342517399
(2019-Jun-11.16934252)
3.4258e-05 TDB
period 2000.078116012638
5.48
7.8278e-06
2.143e-08
d
yr
n .1799929698334468 7.0445e-10 deg/d
Q 3.776125340780695 9.8525e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3610  
   data-arc span      54602 days (149.49 yr)  
   first obs. used      1871-12-29  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44549  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:31:04  

Additional Information
 Earth MOID = 1.44716 au 
 Jupiter MOID = 1.66924 au 
 T_jup = 3.179 
[ 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 8.76   n/a E2021B10 IRAS observations used: 11
diameter diameter 109.929 km 0.609 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 16.634 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Surdej, J.; Surdej, A.; Louis, B. (1983) Astron. Astrophys. Suppl. Ser. 52, 203-211.]
[Pilcher, F. (2020) Minor Planet Bull. 47, 192-195.]
geometric albedo albedo 0.056   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.703   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=3.71, mean=9.31, max.=17.22) deg.
U-B UB 0.321   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=3.71, mean=7.73, max.=13.25) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

86 Semele (A866 AA)          Discovered 1866-Jan-04 by Tietjen, F. at Berlin
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A866 AA = 1978 BB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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