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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06861118031920153 3.5382e-08  
a 3.012499104287533 1.5347e-08 au
q 2.805807985031828 1.0448e-07 au
i 9.688742201603343 5.4804e-06 deg
node 190.6621105339599 2.0726e-05 deg
peri 257.4387464374086 4.4058e-05 deg
M 111.1375321989389 3.8799e-05 deg
tp 2458410.914132476949
(2018-Oct-19.41413248)
0.00020519 TDB
period 1909.804078862971
5.23
1.4594e-05
3.996e-08
d
yr
n .1885010111688164 1.4405e-09 deg/d
Q 3.219190223543238 1.64e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2271  
   data-arc span      10005 days (27.39 yr)  
   first obs. used      1993-01-24  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4548  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 17:50:38  

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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