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181958 (1999 UL7)
Classification: Mars-crossing Asteroid          SPK-ID: 2181958
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3419409084618767 4.5049e-08  
a 2.409097868351354 1.2434e-08 au
q 1.585328754673722 1.0469e-07 au
i 20.40708580628347 7.1842e-06 deg
node 324.4457563831967 1.2355e-05 deg
peri 92.91048884978996 1.8663e-05 deg
M 240.7455372429017 1.1612e-05 deg
tp 2459652.930871637304
(2022-Mar-14.43087164)
4.6484e-05 TDB
period 1365.777934207622
3.74
1.0574e-05
2.895e-08
d
yr
n .2635860420521876 2.0407e-09 deg/d
Q 3.232866982028987 1.6686e-08 au
  Orbit Determination Parameters
   # obs. used (total)      730  
   data-arc span      7149 days (19.57 yr)  
   first obs. used      1999-09-28  
   last obs. used      2019-04-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53047  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:45  

Additional Information
 Earth MOID = .743197 au 
 Jupiter MOID = 2.52593 au 
 T_jup = 3.358 
[ 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 15.28   n/a MPCxxxxx  
diameter diameter 2.406 km 0.316 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 5.37337 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 0.289   0.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

181958 (1999 UL7)          Discovered 1999-Oct-30 by LINEAR at Socorro
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

Alternate Designations
 1999 UL7 = 2000 BU2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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