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21997 (1999 XP36)
Classification: Main-belt Asteroid          SPK-ID: 2021997
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .178775433796351 1.5581e-08  
a 2.580715530448032 7.8192e-09 au
q 2.119346991987205 4.0258e-08 au
i 10.8113360448935 5.3644e-07 deg
node 20.80823613381513 4.6748e-06 deg
peri 11.60540980457897 6.6911e-06 deg
M 45.33896909253301 5.6551e-06 deg
tp 2459009.788109991385
(2020-Jun-09.28810999)
2.3533e-05 TDB
period 1514.288519948031
4.15
6.8821e-06
1.884e-08
d
yr
n .2377354085814206 1.0805e-09 deg/d
Q 3.042084068908859 9.2171e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2149  
   data-arc span      15498 days (42.43 yr)  
   first obs. used      1978-10-09  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44687  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:14  

Additional Information
 Earth MOID = 1.12476 au 
 Jupiter MOID = 2.41696 au 
 T_jup = 3.377 
[ 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 13.49   n/a E2021B10  
diameter diameter 5.994 km 0.264 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.215   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21997 (1999 XP36)          Discovered 1999-Dec-07 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XP36 = 1978 TP = 1990 JD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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