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21501 Acevedo (1998 KC8)
Classification: Main-belt Asteroid          SPK-ID: 2021501
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07227772380040122 2.8227e-08  
a 2.314218093766915 7.1862e-09 au
q 2.146951677571739 6.5645e-08 au
i 5.585100205691921 3.2156e-06 deg
node 261.48384895515 3.6708e-05 deg
peri 220.1418358490401 4.6009e-05 deg
M 313.1192465681956 2.853e-05 deg
tp 2459563.954543651214
(2021-Dec-15.45454365)
0.00010222 TDB
period 1285.893064882788
3.52
5.9895e-06
1.64e-08
d
yr
n .2799610712830267 1.304e-09 deg/d
Q 2.481484509962092 7.7056e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1933  
   data-arc span      15411 days (42.19 yr)  
   first obs. used      1978-11-28  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4569  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:33:41  

Additional Information
 Earth MOID = 1.16684 au 
 Jupiter MOID = 2.58003 au 
 T_jup = 3.572 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457213.5 (2015-Jul-10.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07203054412704113 2.8048e-08  
q 2.14785825063809 6.5271e-08 au
tp 2456988.292730166602
(2014-Nov-26.79273017)
9.8587e-05 TDB
node 261.5225274150768 3.6689e-05 deg
peri 219.252833880219 4.6132e-05 deg
i 5.58605098007963 3.2169e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1933  
   data-arc span      15411 days (42.19 yr)  
   first obs. used      1978-11-28  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4569  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:33:41  

Additional Information
 Jupiter MOID = 2.58003 au 
 T_jup = 3.572 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.867044219838289E-16 -1.820946478682264E-15 3.280445033288219E-13 -5.476561614034276E-16 1.021995000899234E-13 5.271941041153703E-16
q -1.820946478682264E-15 4.260255929010285E-15 -5.499316273893603E-13 7.62731251977622E-16 -1.761726273712876E-13 -1.070192551606975E-15
tp 3.280445033288219E-13 -5.499316273893603E-13 9.719357114925436E-9 -2.197794421247876E-11 2.769630592828864E-9 2.507848203557473E-12
node -5.476561614034276E-16 7.62731251977622E-16 -2.197794421247876E-11 1.346111008690768E-9 -1.345659145190053E-9 -1.43876968470481E-11
peri 1.021995000899234E-13 -1.761726273712876E-13 2.769630592828864E-9 -1.345659145190053E-9 2.128145710450843E-9 1.504930895140337E-11
i 5.271941041153703E-16 -1.070192551606975E-15 2.507848203557473E-12 -1.43876968470481E-11 1.504930895140337E-11 1.034820017531178E-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 14.95   n/a MPCxxxxx  
rotation period rot_per 6.569 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

21501 Acevedo           Discovered 1998 May 23 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Tony Acevedo (b. 1950) is a multimedia graphic designer and media officer at the Arecibo Observatory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

Alternate Designations
 1998 KC8 = 1978 WY19 = 1998 HV149 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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