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101728 (1999 EW7)
Classification: Main-belt Asteroid          SPK-ID: 2101728
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1392264383130781 5.5198e-08  
a 2.569770275193101 1.6659e-08 au
q 2.211990312495147 1.4925e-07 au
i 8.321566450434375 5.3692e-06 deg
node 346.2377541279156 2.5421e-05 deg
peri 356.8261983074826 2.873e-05 deg
M 239.843598269294 1.4091e-05 deg
tp 2459502.708769756986
(2021-Oct-15.20876976)
6.0097e-05 TDB
period 1504.665207249733
4.12
1.4631e-05
4.006e-08
d
yr
n .2392558811524708 2.3265e-09 deg/d
Q 2.927550237891055 1.8978e-08 au
  Orbit Determination Parameters
   # obs. used (total)      710  
   data-arc span      7773 days (21.28 yr)  
   first obs. used      1999-02-09  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52626  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:58:49  

Additional Information
 Earth MOID = 1.20425 au 
 Jupiter MOID = 2.46921 au 
 T_jup = 3.402 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457235.5 (2015-Aug-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1376219936614167 5.5071e-08  
q 2.218632189557057 1.487e-07 au
tp 2456490.178938751573
(2013-Jul-16.67893875)
5.9737e-05 TDB
node 346.2599130936986 2.541e-05 deg
peri 356.5914322524684 2.881e-05 deg
i 8.320762814138615 5.3672e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      710  
   data-arc span      7773 days (21.28 yr)  
   first obs. used      1999-02-09  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52626  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:58:49  

Additional Information
 Jupiter MOID = 2.46921 au 
 T_jup = 3.402 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.032763287023595E-15 -8.158939519868297E-15 9.545954567207861E-13 1.467245304103133E-15 1.58665129313486E-13 3.928732633131897E-15
q -8.158939519868297E-15 2.211087432091887E-14 -2.628259405627893E-12 -5.826656862480961E-15 -4.218605886772389E-13 -1.031469000913323E-14
tp 9.545954567207861E-13 -2.628259405627893E-12 3.568551822098633E-9 -1.012299713519047E-11 8.139719382688244E-10 -4.50442836842499E-13
node 1.467245304103133E-15 -5.826656862480961E-15 -1.012299713519047E-11 6.456748682357614E-10 -6.411855781124007E-10 1.565575617502613E-11
peri 1.58665129313486E-13 -4.218605886772389E-13 8.139719382688244E-10 -6.411855781124007E-10 8.30013350872718E-10 -1.566203705410961E-11
i 3.928732633131897E-15 -1.031469000913323E-14 -4.50442836842499E-13 1.565575617502613E-11 -1.566203705410961E-11 2.880650353835714E-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 15.7   n/a MPO469024  
diameter diameter 2.226 km 0.724 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.187   0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101728 (1999 EW7)          Discovered 1999-Mar-12 by Spacewatch at Kitt Peak
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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