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25302 Niim (1998 XW3)
Classification: Main-belt Asteroid          SPK-ID: 2025302
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0446455619695957 3.6163e-08  
a 3.0448882833996 1.6889e-08 au
q 2.908947534852588 1.154e-07 au
i 10.35295128970682 4.6369e-06 deg
node 64.44150138265073 2.3671e-05 deg
peri 62.03564153588947 6.2967e-05 deg
M 321.2667896535208 5.7755e-05 deg
tp 2459209.302870608775
(2020-Dec-25.80287061)
0.00031155 TDB
period 1940.686887215166
5.31
1.6146e-05
4.421e-08
d
yr
n .185501330674002 1.5433e-09 deg/d
Q 3.180829031946613 1.7643e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2637  
   data-arc span      11817 days (32.35 yr)  
   first obs. used      1987-09-29  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4161  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 00:26:14  

Additional Information
 Earth MOID = 1.94211 au 
 Jupiter MOID = 1.91683 au 
 T_jup = 3.212 
[ 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 12.3   n/a MPO459034  
diameter diameter 12.118 km 0.286 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.984 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.191   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

25302 Niim           Discovered 1998 Dec. 9 by N. Sato at Chichibu.
Yoshihiro Niim is an engineer who made substantial contributions to the Hayabusa mission, which is designed to return a surface sample from (25143) Itokawa, and to the launch of the Japanese large rocket H-II A7 at Tanegashima Space Center.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050919/MPCPages.arcLast Updated: 2005-09-26

[ show close-approach data ]
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