Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
8281 (1991 PC18)
Classification: Main-belt Asteroid          SPK-ID: 2008281
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07847613430080658 4.9824e-08  
a 2.805909154924349 1.7472e-08 au
q 2.585712251246643 1.4259e-07 au
i 6.182396189403617 5.2473e-06 deg
node 295.8216540060916 5.0683e-05 deg
peri 122.9214427908158 6.2552e-05 deg
M 355.6592683567889 3.5646e-05 deg
tp 2457421.199948858667
(2016-Feb-02.69994886)
0.00017001 JED
period 1716.75703582715
4.70
1.6035e-05
4.39e-08
d
yr
n .2096976989097053 1.9586e-09 deg/d
Q 3.026106058602055 1.8843e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1225  
   data-arc span      22769 days (62.34 yr)  
   first obs. used      1953-08-15  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52064  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:06:56  

Additional Information
 Earth MOID = 1.60382 au 
 Jupiter MOID = 2.22902 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. 2015-December); 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. (2015) 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2016-Feb-10 12:54 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin