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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1505947718402463 3.6402e-08  
a 2.633661852166621 1.2656e-08 au
q 2.237046146435228 9.6655e-08 au
i 4.523427897589028 3.75e-06 deg
node 39.34707922258553 4.2767e-05 deg
peri 162.2254345312592 4.4244e-05 deg
M 186.8809502487844 1.3972e-05 deg
tp 2459951.224873513555
(2023-Jan-06.72487351)
6.3644e-05 TDB
period 1561.127760655249
4.27
1.1253e-05
3.081e-08
d
yr
n .2306025227870511 1.6622e-09 deg/d
Q 3.030277557898013 1.4562e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1500  
   data-arc span      22055 days (60.38 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47941  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:42  

Additional Information
 Earth MOID = 1.23357 au 
 Jupiter MOID = 1.92529 au 
 T_jup = 3.378 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457376.5 (2015-Dec-20.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1495158894418522 3.6531e-08  
q 2.241399673607619 9.6969e-08 au
tp 2456828.092496423114
(2014-Jun-19.59249642)
5.3883e-05 TDB
node 39.39602347337032 4.2719e-05 deg
peri 162.4185599973705 4.4206e-05 deg
i 4.525456068962682 3.7509e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1500  
   data-arc span      22055 days (60.38 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47941  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:42  

Additional Information
 Jupiter MOID = 1.92529 au 
 T_jup = 3.378 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.334497742383538E-15 -3.520274008909774E-15 -6.109411244362307E-13 -2.355357956557953E-15 -1.167002115169615E-13 -1.38289518837797E-16
q -3.520274008909774E-15 9.403058905328935E-15 1.76878194736246E-12 6.015159029187465E-15 3.474819186240558E-13 5.223681126208043E-16
tp -6.109411244362307E-13 1.76878194736246E-12 2.903422137319167E-9 3.811157912592353E-12 6.244247142979146E-10 1.512415306650426E-13
node -2.355357956557953E-15 6.015159029187465E-15 3.811157912592353E-12 1.824934789766254E-9 -1.818373235634396E-9 -4.499505614669014E-11
peri -1.167002115169615E-13 3.474819186240558E-13 6.244247142979146E-10 -1.818373235634396E-9 1.954136129304145E-9 4.491852713130232E-11
i -1.38289518837797E-16 5.223681126208043E-16 1.512415306650426E-13 -4.499505614669014E-11 4.491852713130232E-11 1.406944808467809E-11

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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