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21889 (1999 UJ47)
Classification: Main-belt Asteroid          SPK-ID: 2021889
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1505947743861229 3.6414e-08  
a 2.633661856732903 1.2675e-08 au
q 2.237046143608874 9.6675e-08 au
i 4.523427908809615 3.7511e-06 deg
node 39.34707771628439 4.3014e-05 deg
peri 162.2254345427621 4.4488e-05 deg
M 186.8809509944941 1.398e-05 deg
tp 2459951.224872232237
(2023-Jan-06.72487223)
6.3665e-05 TDB
period 1561.127764715309
4.27
1.127e-05
3.086e-08
d
yr
n .2306025221873179 1.6647e-09 deg/d
Q 3.030277569856932 1.4584e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1493  
   data-arc span      22025 days (60.30 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47855  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:55  

Additional Information
 Earth MOID = 1.23357 au 
 Jupiter MOID = 1.92529 au 
 T_jup = 3.378 
[ 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 14.52   n/a E2021B10  
diameter diameter 7.375 km 0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.05 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:
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) Ap. J. Supp. Ser. 241, A6.]
geometric albedo albedo 0.071   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21889 (1999 UJ47)          Discovered 1999-Oct-29 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 UJ47 = 1987 YN5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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