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21999 Disora (1999 XS38)
Classification: Main-belt Asteroid          SPK-ID: 2021999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1609830864843546 1.9287e-08  
a 2.659414847203181 9.3697e-09 au
q 2.231294036858094 5.1606e-08 au
i 14.32587006363129 3.614e-07 deg
node 78.84626765053332 1.1809e-06 deg
peri 190.3674271799635 8.0879e-06 deg
M 156.3067197780285 7.1579e-06 deg
tp 2458708.714986017570
(2019-Aug-13.21498602)
2.9934e-05 TDB
period 1584.081640157862
4.34
8.3716e-06
2.292e-08
d
yr
n .2272610141255877 1.201e-09 deg/d
Q 3.087535657548267 1.0878e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2311  
   data-arc span      11090 days (30.36 yr)  
   first obs. used      1990-10-25  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42963  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:19  

Additional Information
 Earth MOID = 1.21673 au 
 Jupiter MOID = 2.00575 au 
 T_jup = 3.324 
[ 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 13.29   n/a MPCxxxxx  
diameter diameter 5.486 km 0.105 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.158   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21999 Disora           Discovered 1999 Dec. 7 by F. Mallia at Campo Catino.
Mario Di Sora is founder and manager of the Campo Catino Observatory. A lawyer by profession, as president of the Italian section of the International Dark Sky Association, he has promoted several regional laws on light pollution in Italy, notably by making Rome the first dark-sky capital in the world.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

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Alternate Designations
 1999 XS38 = 1990 VN11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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