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16541 (1991 PW18)
Classification: Main-belt Asteroid          SPK-ID: 2016541
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06386795679175196 7.3194e-08  
a 2.899058342411737 2.8338e-08 AU
q 2.713901409461816 2.0717e-07 AU
i 1.73417397299394 9.4521e-06 deg
node 202.8619860509285 0.00019246 deg
peri 206.253958844608 0.00020489 deg
M 190.5171459627964 6.8289e-05 deg
tp 2457849.303434248703
(2017-Apr-05.80343425)
0.00034304 JED
period 1802.95073543225
4.94
2.6435e-05
7.238e-08
d
yr
n .1996726770871482 2.9277e-09 deg/d
Q 3.084215275361658 3.0148e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      982  
   data-arc span      11948 days (32.71 yr)  
   first obs. used      1981-09-29  
   last obs. used      2014-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50543  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:31:54  

Additional Information
 Earth MOID = 1.7236 AU 
 T_jup = 3.284 
[ 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 12.9 mag n/a MPO299081  
rotation period rot_per 7.01 h n/a LCDB (Rev. 2015-May); 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:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]

16541 (1991 PW18)          Discovered 1991-Aug-08 by Holt, H. E. at Palomar
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 PW18 = 2000 KA33 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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