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21462 Karenedbal (1998 HC78)
Classification: Main-belt Asteroid          SPK-ID: 2021462
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1389887913028501 3.6653e-08  
a 2.418385057378353 9.2491e-09 au
q 2.082256641348462 8.8224e-08 au
i 4.807248842584462 3.6297e-06 deg
node 234.1010392440199 4.3531e-05 deg
peri 237.1395794783505 4.5291e-05 deg
M 144.2073551175084 1.1149e-05 deg
tp 2458846.235476669671
(2019-Dec-28.73547667)
4.2799e-05 TDB
period 1373.68325102072
3.76
7.8804e-06
2.158e-08
d
yr
n .2620691485700949 1.5034e-09 deg/d
Q 2.754513473408244 1.0535e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1667  
   data-arc span      14526 days (39.77 yr)  
   first obs. used      1981-10-30  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48893  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:41  

Additional Information
 Earth MOID = 1.10383 au 
 Jupiter MOID = 2.37048 au 
 T_jup = 3.497 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457269.5 (2015-Sep-04.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1384399533897431 3.6699e-08  
q 2.083954636892309 8.8347e-08 au
tp 2457473.703552967544
(2016-Mar-26.20355297)
4.4739e-05 TDB
node 234.1435615364967 4.3572e-05 deg
peri 237.5133436546902 4.5345e-05 deg
i 4.803794809542736 3.628e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1667  
   data-arc span      14526 days (39.77 yr)  
   first obs. used      1981-10-30  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48893  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:41  

Additional Information
 Jupiter MOID = 2.37048 au 
 T_jup = 3.497 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.346790678703968E-15 -3.228793010196459E-15 -2.010287927151892E-13 1.240021518352015E-14 -5.579137270203358E-14 -8.433078630529554E-17
q -3.228793010196459E-15 7.805200096371932E-15 3.74948627622193E-13 -2.942644958254916E-14 1.009071144581382E-13 2.38003450043767E-16
tp -2.010287927151892E-13 3.74948627622193E-13 2.001596131574241E-9 -9.030280877829615E-12 5.74816196856652E-10 3.577000064929121E-13
node 1.240021518352015E-14 -2.942644958254916E-14 -9.030280877829615E-12 1.898553770483137E-9 -1.894019794969972E-9 4.599587576578147E-11
peri -5.579137270203358E-14 1.009071144581382E-13 5.74816196856652E-10 -1.894019794969972E-9 2.05613276219532E-9 -4.574558436509583E-11
i -8.433078630529554E-17 2.38003450043767E-16 3.577000064929121E-13 4.599587576578147E-11 -4.574558436509583E-11 1.316250687263822E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.71   n/a MPO636386  
diameter diameter 6.458 km 0.158 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.046   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21462 Karenedbal           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Karen Nedbal mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Brearley School, New York, 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: 20050224/MPCPages.arcLast Updated: 2005-02-28

Alternate Designations
 1998 HC78 = 1981 UC3 = 2000 WT57 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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