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21481 Johnwarren (1998 HP125)
Classification: Main-belt Asteroid          SPK-ID: 2021481
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06072103933354039 3.0459e-08  
a 2.363352222012116 8.7625e-09 au
q 2.219847018780308 7.1072e-08 au
i 6.281482658764394 2.8939e-06 deg
node 159.2334108142158 3.4998e-05 deg
peri 303.9798174677641 4.6618e-05 deg
M 253.4098165327982 3.1924e-05 deg
tp 2459789.421517882226
(2022-Jul-28.92151788)
0.00011846 TDB
period 1327.061665872133
3.63
7.3805e-06
2.021e-08
d
yr
n .2712760147158731 1.5087e-09 deg/d
Q 2.506857425243924 9.2946e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1498  
   data-arc span      10205 days (27.94 yr)  
   first obs. used      1992-10-01  
   last obs. used      2020-09-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49801  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:46:09  

Additional Information
 Earth MOID = 1.24377 au 
 Jupiter MOID = 2.55398 au 
 T_jup = 3.539 
[ 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 15.04   n/a E2020-QM5  
diameter diameter 2.616 km 0.506 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 276.973 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.310   0.201 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21481 Johnwarren           Discovered 1998 Apr. 23 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
John Warren mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. He teaches at the C. K. McClatchy High School, Sacramento, California.
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

[ show close-approach data ]
Alternate Designations
 1998 HP125 = 1999 RJ168 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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