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JPL Small-Body Database Browser
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20186 (1997 AD8)
Classification: Main-belt Asteroid          SPK-ID: 2020186
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .110636076439055 6.0318e-08  
a 2.637420137627756 1.6818e-08 au
q 2.345626321679268 1.6711e-07 au
i 2.096935810317188 4.1001e-06 deg
node 258.2075946045068 0.00016179 deg
peri 102.962328518138 0.00016294 deg
M 187.3881187398341 2.1285e-05 deg
tp 2459350.628366330770
(2021-May-16.12836633)
9.5793e-05 TDB
period 1564.470590944173
4.28
1.4964e-05
4.097e-08
d
yr
n .2301097905475721 2.201e-09 deg/d
Q 2.929213953576243 1.8678e-08 au
  Orbit Determination Parameters
   # obs. used (total)      728  
   data-arc span      10036 days (27.48 yr)  
   first obs. used      1991-11-11  
   last obs. used      2019-05-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59365  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:49:53  

Additional Information
 Earth MOID = 1.34274 au 
 Jupiter MOID = 2.51177 au 
 T_jup = 3.387 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.4   n/a MPO290617  
diameter diameter 3.458 km 0.731 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.161 h n/a LCDB (Rev. 2019-January); 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.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.093   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20186 (1997 AD8)          Discovered 1997-Jan-02 by Spacewatch at Kitt Peak
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1997 AD8 = 1998 KB42 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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