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21502 Cruz (1998 KB9)
Classification: Main-belt Asteroid          SPK-ID: 2021502
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1226229550661874 2.8013e-08  
a 2.60132341836826 9.4476e-09 au
q 2.282341453725068 7.0991e-08 au
i 3.686361797763569 2.9242e-06 deg
node 115.8518976322438 6.4569e-05 deg
peri 205.3367172688096 6.6809e-05 deg
M 61.59314737860925 1.6885e-05 deg
tp 2458938.307750872313
(2020-Mar-29.80775087)
7.1875e-05 TDB
period 1532.462842104213
4.20
8.3485e-06
2.286e-08
d
yr
n .234915973235401 1.2798e-09 deg/d
Q 2.920305383011452 1.0606e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1698  
   data-arc span      8744 days (23.94 yr)  
   first obs. used      1997-02-03  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45566  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:55  

Additional Information
 Earth MOID = 1.26816 au 
 Jupiter MOID = 2.35676 au 
 T_jup = 3.401 
[ 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 14.53   n/a E2020-QM5  
diameter diameter 3.173 km 0.424 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.367   0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21502 Cruz           Discovered 1998 May 24 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Jose Cruz (b. 1946), operations group head and telescope operator at the Arecibo Observatory, has played a key role in numerous radar experiments on minor planets since the 1970s.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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