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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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06386795444693055 7.2648e-08  
a 2.899058341758305 2.8222e-08 AU
q 2.713901415647892 2.0583e-07 AU
i 1.734174706530128 9.3757e-06 deg
node 202.8619772796204 0.00019194 deg
peri 206.2539695966956 0.00020424 deg
M 190.5171442207048 6.7964e-05 deg
tp 2457849.303442686466
(2017-Apr-05.80344269)
0.00034153 JED
period 1802.950734822687
4.94
2.6327e-05
7.208e-08
d
yr
n .1996726771546559 2.9157e-09 deg/d
Q 3.084215267868718 3.0024e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      988  
   data-arc span      12340 days (33.79 yr)  
   first obs. used      1981-09-29  
   last obs. used      2015-07-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50444  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:45:57  

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-July); 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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