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20485 (1999 NJ54)
Classification: Main-belt Asteroid          SPK-ID: 2020485
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1737455732153539 4.0635e-08  
a 2.66526549323714 1.2557e-08 au
q 2.20218741234355 1.0903e-07 au
i 13.25139946359879 4.385e-06 deg
node 205.5645963416144 1.5094e-05 deg
peri 196.020332093985 1.7583e-05 deg
M 265.8605281161634 1.0306e-05 deg
tp 2459616.102736629560
(2022-Feb-05.60273663)
4.6755e-05 TDB
period 1589.311924027589
4.35
1.1231e-05
3.075e-08
d
yr
n .2265131183862877 1.6007e-09 deg/d
Q 3.12834357413073 1.4738e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1350  
   data-arc span      10001 days (27.38 yr)  
   first obs. used      1993-04-17  
   last obs. used      2020-09-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49801  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:22:10  

Additional Information
 Earth MOID = 1.21148 au 
 Jupiter MOID = 2.30619 au 
 T_jup = 3.324 
[ 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 14.12   n/a E2021B10  
diameter diameter 4.338 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 130.47 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 0.259   0.062 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20485 (1999 NJ54)          Discovered 1999-Jul-12 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 NJ54 = 1996 CN = 1998 HV150 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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