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8281 (1991 PC18)
Classification: Main-belt Asteroid          SPK-ID: 2008281
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07834674613153418 4.9824e-08  
a 2.805560256087011 1.7021e-08 au
q 2.58575373894664 1.4253e-07 au
i 6.182673802013888 5.0849e-06 deg
node 295.8192146989441 5.0111e-05 deg
peri 122.9364575997684 6.1671e-05 deg
M 37.59620032013188 3.4689e-05 deg
tp 2457421.245823997166
(2016-Feb-02.74582400)
0.00016527 JED
period 1716.436842328056
4.70
1.562e-05
4.277e-08
d
yr
n .2097368170632604 1.9086e-09 deg/d
Q 3.025366773227382 1.8354e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1293  
   data-arc span      22860 days (62.59 yr)  
   first obs. used      1953-08-15  
   last obs. used      2016-03-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52702  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 15:59:38  

Additional Information
 Earth MOID = 1.60323 au 
 Jupiter MOID = 2.22823 au 
 T_jup = 3.310 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2 mag n/a MPO347592  
rotation period rot_per 12.6349 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]

8281 (1991 PC18)          Discovered 1991-Aug-08 by Holt, H. E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1991 PC18 = 1993 BX 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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