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21091 (1992 DK8)
Classification: Main-belt Asteroid          SPK-ID: 2021091
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1947756964847948 2.9253e-08  
a 2.245317991338086 5.3944e-09 au
q 1.80798461574537 6.7009e-08 au
i 5.228139398993982 3.3591e-06 deg
node 217.6361499431033 3.4743e-05 deg
peri 126.6896613027045 3.5875e-05 deg
M 13.02000879558792 8.1801e-06 deg
tp 2459156.054889716719
(2020-Nov-02.55488972)
2.7914e-05 TDB
period 1228.89622834995
3.36
4.4287e-06
1.213e-08
d
yr
n .292945809170051 1.0557e-09 deg/d
Q 2.682651366930802 6.4451e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1917  
   data-arc span      11072 days (30.31 yr)  
   first obs. used      1990-10-15  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45023  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:38:47  

Additional Information
 Earth MOID = .805017 au 
 Jupiter MOID = 2.74978 au 
 T_jup = 3.601 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.87   n/a E2021B10  
diameter diameter 3.816 km 0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 17.6695 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.138   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21091 (1992 DK8)          Discovered 1992-Feb-29 by UESAC at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1992 DK8 = 1990 TA16 = 1996 HQ16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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