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JPL Small-Body Database Browser
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20341 Alanstack (1998 HX91)
Classification: Main-belt Asteroid          SPK-ID: 2020341
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07780935701826251 3.3423e-08  
a 2.417186006359077 9.0659e-09 au
q 2.229106317410735 8.1927e-08 au
i 5.09186086574731 4.1492e-06 deg
node 168.6340533108553 3.7597e-05 deg
peri 228.4165398877512 4.5269e-05 deg
M 32.2879201560426 2.4618e-05 deg
tp 2458477.387796720963
(2018-Dec-24.88779672)
9.3838e-05 TDB
period 1372.661756045596
3.76
7.7224e-06
2.114e-08
d
yr
n .2622641728120251 1.4755e-09 deg/d
Q 2.605265695307418 9.7713e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1723  
   data-arc span      17844 days (48.85 yr)  
   first obs. used      1971-01-29  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53447  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:43:16  

Additional Information
 Earth MOID = 1.23838 au 
 Jupiter MOID = 2.68803 au 
 T_jup = 3.506 
[ 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 14.5   n/a MPO459007  
diameter diameter 3.708 km 0.363 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.245   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20341 Alanstack           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Alan Stack mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Midwood High School, Brooklyn, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

[ show close-approach data ]
Alternate Designations
 1998 HX91 = 1971 BW3 = 1999 RE152 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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