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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1367094579418245 5.931e-08  
a 3.088025715119168 2.6517e-08 au
q 2.665863393494812 1.8148e-07 au
i 11.63517452075886 7.4116e-06 deg
node 291.0852248310997 3.2259e-05 deg
peri 147.8981460234804 4.4973e-05 deg
M 130.5771256918637 2.8677e-05 deg
tp 2456881.573664337714
(2014-Aug-12.07366434)
0.00015718 JED
period 1982.073655451505
5.43
2.553e-05
6.99e-08
d
yr
n .181627962719677 2.3395e-09 deg/d
Q 3.510188036743525 3.0142e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1108  
   data-arc span      22858 days (62.58 yr)  
   first obs. used      1953-09-16  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46646  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:58:18  

Additional Information
 Earth MOID = 1.68813 au 
 Jupiter MOID = 1.73499 au 
 T_jup = 3.180 
[ 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. 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.]

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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