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JPL Small-Body Database Browser
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15498 (1999 EQ4)
Classification: Main-belt Asteroid          SPK-ID: 2015498
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06861117896287092 3.8956e-08  
a 3.012499105129701 1.7666e-08 au
q 2.805807989902159 1.1914e-07 au
i 9.688742485318446 5.5073e-06 deg
node 190.6621234833472 2.4952e-05 deg
peri 257.4387330903285 4.655e-05 deg
M 111.1375324365337 3.8863e-05 deg
tp 2458410.914130969271
(2018-Oct-19.41413097)
0.00020567 TDB
period 1909.804079663822
5.23
1.6799e-05
4.599e-08
d
yr
n .188501011089771 1.6581e-09 deg/d
Q 3.219190220357243 1.8878e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1975  
   data-arc span      9844 days (26.95 yr)  
   first obs. used      1993-01-24  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47781  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 23:49:51  

Additional Information
 Earth MOID = 1.84203 au 
 Jupiter MOID = 1.96848 au 
 T_jup = 3.224 
[ 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 12.5   n/a MPO435844  
diameter diameter 10.514 km 0.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 34.579 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.184   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

15498 (1999 EQ4)          Discovered 1999-Mar-13 by Korlevic, K. at Visnjan
Reference: 20000621/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 EQ4 = 1994 GP10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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