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7181 (1991 PH12)
Classification: Main-belt Asteroid          SPK-ID: 2007181
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1363575508313195 6.4256e-08  
a 3.089954469263165 2.8047e-08 au
q 2.66861584565415 2.0013e-07 au
i 11.63492391398894 8.3347e-06 deg
node 291.1234204236263 3.2744e-05 deg
peri 148.0993915174921 4.9637e-05 deg
M 94.03194273788942 3.2888e-05 deg
tp 2456882.297558095572
(2014-Aug-12.79755810)
0.0001819 JED
period 1983.93092446897
5.43
2.7012e-05
7.395e-08
d
yr
n .1814579305962276 2.4706e-09 deg/d
Q 3.51129309287218 3.1871e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1036  
   data-arc span      22505 days (61.62 yr)  
   first obs. used      1953-09-16  
   last obs. used      2015-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .45759  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 15:57:27  

Additional Information
 Earth MOID = 1.69191 au 
 Jupiter MOID = 1.73406 au 
 T_jup = 3.179 
[ 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 12.4 mag n/a MPO337315  
rotation period rot_per 206.6879 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.]

7181 (1991 PH12)          Discovered 1991-Aug-07 by Holt, H. E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1991 PH12 = 1986 RN4 = 1986 TU2 = 1986 VK9 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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