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21530 Despiau (1998 MB38)
Classification: Main-belt Asteroid          SPK-ID: 2021530
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05779986241313146 5.6115e-08  
a 2.727061094378756 2.3092e-08 au
q 2.56943733833146 1.5813e-07 au
i 10.75512253366731 6.8294e-06 deg
node 301.0657970429505 3.9513e-05 deg
peri 319.8129267995037 8.824e-05 deg
M 51.25578423300029 8.1611e-05 deg
tp 2457366.303117217009
0.00037263 JED
period 1644.904649563324
n .2188576706227744 2.7798e-09 deg/d
Q 2.884684850426052 2.4427e-08 au
  Orbit Determination Parameters
   # obs. used (total)      875  
   data-arc span      15862 days (43.43 yr)  
   first obs. used      1972-11-03  
   last obs. used      2016-04-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49618  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:36:59  

Additional Information
 Earth MOID = 1.56254 au 
 Jupiter MOID = 2.255 au 
 T_jup = 3.328 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.1 mag n/a MPO337440  
rotation period rot_per 3.0096 h n/a LCDB (Rev. 2016-February); 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. (2016) Astron. J. 150, A75.]

21530 Despiau           Discovered 1998 June 26 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Norberto Despiau (b. 1948), staff technician 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

Alternate Designations
 1998 MB38 = 1972 VD2 = 1990 XE1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-01 17:28 UT
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