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15985 (1998 WU20)
Classification: Main-belt Asteroid          SPK-ID: 2015985
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05041885357223693 1.0356e-08  
a 2.222615243103307 6.1506e-09 au
q 2.110553530613859 2.4873e-08 au
i 7.542398951218277 1.2035e-06 deg
node 216.94577981 4.9649e-06 deg
peri 9.398086017240784 2.2469e-05 deg
M 69.06322457072761 2.2921e-05 deg
tp 2458968.312299431243
(2020-Apr-28.81229943)
7.7183e-05 TDB
period 1210.305089637835
3.31
5.0239e-06
1.375e-08
d
yr
n .2974456631490531 1.2347e-09 deg/d
Q 2.334676955592755 6.4608e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2174  
   data-arc span      12185 days (33.36 yr)  
   first obs. used      1987-06-02  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47082  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:14:53  

Additional Information
 Earth MOID = 1.10035 au 
 Jupiter MOID = 2.63679 au 
 T_jup = 3.635 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456928.5 (2014-Sep-28.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05040147144835919 1.0332e-08  
q 2.110049361887692 2.4807e-08 au
tp 2456548.371920283120
(2013-Sep-12.87192028)
7.9199e-05 TDB
node 217.0017264921 4.9678e-06 deg
peri 9.240099041468275 2.2514e-05 deg
i 7.540976607028489 1.2033e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2174  
   data-arc span      12185 days (33.36 yr)  
   first obs. used      1987-06-02  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47082  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:14:53  

Additional Information
 Jupiter MOID = 2.63679 au 
 T_jup = 3.635 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.067424043445897E-16 -2.493994220508518E-16 -1.786407127912476E-13 -5.287447315199924E-15 -4.71171780486624E-14 5.261856979238272E-15
q -2.493994220508518E-16 6.153820250285104E-16 2.801997894952906E-13 1.06187945359938E-14 7.64499906795422E-14 -1.17241305300713E-14
tp -1.786407127912476E-13 2.801997894952906E-13 6.272516597505608E-9 4.240227387848949E-11 1.742308521846653E-9 8.439619217079349E-12
node -5.287447315199924E-15 1.06187945359938E-14 4.240227387848949E-11 2.467870348961279E-11 -1.12942158973027E-11 -3.368859085184842E-12
peri -4.71171780486624E-14 7.64499906795422E-14 1.742308521846653E-9 -1.12942158973027E-11 5.069005472346879E-10 5.530243364486515E-12
i 5.261856979238272E-15 -1.17241305300713E-14 8.439619217079349E-12 -3.368859085184842E-12 5.530243364486515E-12 1.44803056598018E-12

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 14.09   n/a E2021B10  
diameter diameter 6.340 km 0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.2252 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 0.110   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15985 (1998 WU20)          Discovered 1998-Nov-18 by LINEAR at Socorro
Reference: 20000726/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 WU20 = 1987 LA = 1988 VQ5 = 1991 RB14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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