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21496 Lijianyang (1998 JQ2)
Classification: Main-belt Asteroid          SPK-ID: 2021496
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2009048889884795 3.5124e-08  
a 2.684168869811465 1.2061e-08 au
q 2.14490622099566 9.9323e-08 au
i 8.197166636670628 3.4797e-06 deg
node 154.5744864416403 3.0201e-05 deg
peri 165.387041521895 3.2409e-05 deg
M 340.3078853582916 1.3386e-05 deg
tp 2459288.362394409468
(2021-Mar-14.86239441)
5.9975e-05 TDB
period 1606.250144431632
4.40
1.0827e-05
2.964e-08
d
yr
n .224124493465733 1.5107e-09 deg/d
Q 3.223431518627269 1.4485e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1536  
   data-arc span      10948 days (29.97 yr)  
   first obs. used      1990-09-14  
   last obs. used      2020-09-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4932  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:56:42  

Additional Information
 Earth MOID = 1.13145 au 
 Jupiter MOID = 2.12005 au 
 T_jup = 3.331 
[ 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 14.12   n/a E2020-QM5  
diameter diameter 7.311 km 0.340 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.542 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.100   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21496 Lijianyang           Discovered 1998 May 1 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Jianyang Li (b. 1976), University of Maryland, has studied the surface light-scattering properties of minor planets and comets. He has discovered a correlation of photometric properties with outgassing on comet 19P/Borrelly; and, on (1) Ceres, spatially varying strong ultraviolet absorption by an unidentified species.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Alternate Designations
 1998 JQ2 = 1990 SW7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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