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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07218190331097749 2.8268e-08  
a 2.314074684501988 7.2304e-09 au
q 2.147040369370885 6.5714e-08 au
i 5.585227209216829 3.2168e-06 deg
node 261.4833404558392 3.6742e-05 deg
peri 220.1737035113288 4.6056e-05 deg
M 258.2032477619222 2.8461e-05 deg
tp 2459564.076584372387
(2021-Dec-15.57658437)
0.00010233 TDB
period 1285.773538903727
3.52
6.0262e-06
1.65e-08
d
yr
n .2799870965667425 1.3122e-09 deg/d
Q 2.481108999633091 7.7523e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1920  
   data-arc span      15387 days (42.13 yr)  
   first obs. used      1978-11-28  
   last obs. used      2021-01-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45773  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:54  

Additional Information
 Earth MOID = 1.16639 au 
 Jupiter MOID = 2.58075 au 
 T_jup = 3.573 
[ 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 14.92   n/a E2020-QM5  
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

[ show close-approach data ]
Alternate Designations
 1998 KC8 = 1978 WY19 = 1998 HV149 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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