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21486 (1998 HA148)
Classification: Main-belt Asteroid          SPK-ID: 2021486
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08096581229517613 1.1001e-08  
a 2.174479974255807 4.8585e-09 au
q 1.998421436820592 2.4783e-08 au
i 3.544919588036741 6.2992e-07 deg
node 239.5913764829886 1.0718e-05 deg
peri 238.3896095665101 1.6577e-05 deg
M 124.5085583365503 1.1471e-05 deg
tp 2458795.431707528476
(2019-Nov-07.93170753)
3.7118e-05 TDB
period 1171.201299235836
3.21
3.9253e-06
1.075e-08
d
yr
n .3073767082011317 1.0302e-09 deg/d
Q 2.350538511691022 5.2519e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2282  
   data-arc span      10737 days (29.40 yr)  
   first obs. used      1991-02-08  
   last obs. used      2020-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48552  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:46:11  

Additional Information
 Earth MOID = 1.01722 au 
 Jupiter MOID = 2.70433 au 
 T_jup = 3.679 
[ 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 14.29   n/a E2020-QM5  
diameter diameter 4.055 km 0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.3 h n/a LCDB (Rev. 2020-October); 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:
[Clark, M. (2015) Minor Planet Bull. 42, 15-20.]
geometric albedo albedo 0.214   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21486 (1998 HA148)          Discovered 1998-Apr-25 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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