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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 ]

[ show orbit diagram ]
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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1952-Sep-29 05:32 00:01 Jupiter 1.98764691717702 1.98764632069904 1.98764751365483 2.50026316848736 2.32358111898363 2434284.730325158 1.2803425458996 51.3233529257552 16.1579440099937 -81.9736916420256 2369040.46465343 T 33 CATAB v2.0f-lin.ifort 2021-Apr-13 03:54:50 2021-Apr-13 03:54
1999-Jun-14 21:25 < 00:01 Jupiter 1.91420695712094 1.91420665904387 1.91420725519813 2.28128501375514 2.07828679730878 2451344.392058366 0.353523628084705 69.9856077816515 11.7466229005422 -84.6091445136046 2801718.07424111 T 33 CATAB v2.0f-lin.ifort 2021-Apr-13 03:54:50 2021-Apr-13 03:54
2106-Jun-12 14:30 00:02 Jupiter 1.92101850272801 1.92101819351036 1.92101881194555 2.29802151943968 2.09739256739103 2490423.104173858 1.8472513499678 105.785670707992 12.577292234252 -88.561391509212 2843984.31558079 T 33 CATAB v2.0f-lin.ifort 2021-Apr-13 03:54:50 2021-Apr-13 03:54
2153-Feb-26 14:49 00:03 Jupiter 1.96566143743622 1.96566053693698 1.96566233794517 2.44732784087593 2.26441918184603 2507484.117626175 2.80916702760359 242.999607382565 9.72542218984351 -84.5304755046113 3115691.97824995 T 33 CATAB v2.0f-lin.ifort 2021-Apr-13 03:54:50 2021-Apr-13 03:54

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