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JPL Small-Body Database Browser
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85991 (1999 JJ16)
Classification: Main-belt Asteroid          SPK-ID: 2085991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1828966169242015 4.2405e-08  
a 3.007496614311118 1.8357e-08 au
q 2.457435658142625 1.2531e-07 au
i .4156091398297959 5.2603e-06 deg
node 228.1201109648608 0.00059396 deg
peri 97.01853862982485 0.00059414 deg
M 298.4553954838524 1.6325e-05 deg
tp 2459326.181906758977
(2021-Apr-21.68190676)
8.794e-05 TDB
period 1905.048986097065
5.22
1.7442e-05
4.775e-08
d
yr
n .1889715186471627 1.7302e-09 deg/d
Q 3.557557570479612 2.1715e-08 au
  Orbit Determination Parameters
   # obs. used (total)      690  
   data-arc span      8864 days (24.27 yr)  
   first obs. used      1995-10-22  
   last obs. used      2020-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5389  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:42:23  

Additional Information
 Earth MOID = 1.44555 au 
 Jupiter MOID = 1.7828 au 
 T_jup = 3.225 
[ 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 15.0   n/a MPO436376  
diameter diameter 4.524 km 0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.65 h n/a LCDB (Rev. 2019-August); 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.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) ArXiv:1901.08719.]
geometric albedo albedo 0.086   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85991 (1999 JJ16)          Discovered 1999-May-15 by Spacewatch at Kitt Peak
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1999 JJ16 = 2000 QQ68 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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