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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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06861118030886038 3.8247e-08  
a 3.01249910445988 1.7259e-08 au
q 2.805807985223503 1.1631e-07 au
i 9.688742433176811 5.4918e-06 deg
node 190.6621228207923 2.4378e-05 deg
peri 257.438734063565 4.625e-05 deg
M 111.1375323977588 3.8861e-05 deg
tp 2458410.914131371611
(2018-Oct-19.41413137)
0.00020565 TDB
period 1909.804079026863
5.23
1.6412e-05
4.493e-08
d
yr
n .18850101115264 1.6199e-09 deg/d
Q 3.219190223696258 1.8443e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2007  
   data-arc span      9871 days (27.03 yr)  
   first obs. used      1993-01-24  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47458  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 21:20:08  

Additional Information
 Earth MOID = 1.84203 au 
 Jupiter MOID = 1.96848 au 
 T_jup = 3.224 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456318.5 (2013-Jan-26.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06989891118399269 3.7786e-08  
q 2.803758299671097 1.1526e-07 au
tp 2456512.816697131196
(2013-Aug-08.31669713)
0.00020326 TDB
node 190.8469943824883 2.4376e-05 deg
peri 259.8522573990697 4.5974e-05 deg
i 9.68704147689891 5.4933e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2007  
   data-arc span      9871 days (27.03 yr)  
   first obs. used      1993-01-24  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47458  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 21:20:08  

Additional Information
 Jupiter MOID = 1.96848 au 
 T_jup = 3.224 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.42776728989973E-15 -4.312494259916965E-15 -2.062067209040229E-12 -1.516700046935248E-15 -3.955497253403227E-13 -1.150078233589611E-15
q -4.312494259916965E-15 1.328412461821995E-14 6.087205381161344E-12 5.287527841120305E-15 1.160557317163644E-12 3.625210634900187E-15
tp -2.062067209040229E-12 6.087205381161344E-12 4.131597312903283E-8 -2.110596469484952E-11 7.941252795168406E-9 -1.07032796943913E-11
node -1.516700046935248E-15 5.287527841120305E-15 -2.110596469484952E-11 5.941775678065282E-10 -5.891082560133217E-10 2.422257390047355E-11
peri -3.955497253403227E-13 1.160557317163644E-12 7.941252795168406E-9 -5.891082560133217E-10 2.113577368347712E-9 -2.599237578680994E-11
i -1.150078233589611E-15 3.625210634900187E-15 -1.07032796943913E-11 2.422257390047355E-11 -2.599237578680994E-11 3.017610314543871E-11

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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