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21473 Petesullivan (1998 HH99)
Classification: Main-belt Asteroid          SPK-ID: 2021473
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1295924508620461 3.0917e-08  
a 2.256844882130945 5.4414e-09 au
q 1.96437482264013 6.9453e-08 au
i 3.216769951961382 2.7242e-06 deg
node 90.75585605921327 6.2035e-05 deg
peri 233.0041912458527 6.2996e-05 deg
M 211.4368197302396 1.1296e-05 deg
tp 2459907.545630012264
(2022-Nov-24.04563001)
3.9081e-05 TDB
period 1238.371623913485
3.39
4.4787e-06
1.226e-08
d
yr
n .2907043354743005 1.0514e-09 deg/d
Q 2.54931494162176 6.1466e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2209  
   data-arc span      11022 days (30.18 yr)  
   first obs. used      1991-04-06  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50141  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:08:11  

Additional Information
 Earth MOID = .953298 au 
 Jupiter MOID = 2.72769 au 
 T_jup = 3.610 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.65   n/a MPCxxxxx  
diameter diameter 2.974 km 0.202 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.347   0.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21473 Petesullivan           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Peter Sullivan mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Roseville Area High School, Roseville, Minnesota.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

Alternate Designations
 1998 HH99 = 1992 SH24 = 1996 XK15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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