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24984 Usui (1998 KQ42)
Classification: Main-belt Asteroid          SPK-ID: 2024984
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2527737813233087 3.4423e-08  
a 2.259514416585682 5.8198e-09 au
q 1.688368413550789 7.5816e-08 au
i 10.53698341988411 3.7629e-06 deg
node 162.9495511107436 1.582e-05 deg
peri 171.1239516302108 1.7071e-05 deg
M 158.7155293417951 6.9053e-06 deg
tp 2458653.562094770631
(2019-Jun-19.06209477)
2.2604e-05 TDB
period 1240.569506330739
3.40
4.793e-06
1.312e-08
d
yr
n .2901893027056423 1.1212e-09 deg/d
Q 2.830660419620574 7.2909e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1321  
   data-arc span      9850 days (26.97 yr)  
   first obs. used      1994-04-02  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45802  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:39:11  

Additional Information
 Earth MOID = .677749 au 
 Jupiter MOID = 2.56693 au 
 T_jup = 3.557 
[ 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 15.18   n/a MPCxxxxx  
diameter diameter 2.535 km 0.401 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.208   0.060 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

24984 Usui           Discovered 1998 May 27 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Fumihiko Usui (b. 1974) is a research associate at the University of Tokyo. He played a central role in assembling the data catalog for more than 5000 asteroids measured in the infrared by the Akari satellite.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13

Alternate Designations
 1998 KQ42 = 2000 AV175 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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