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161922 (2007 EA57)
Classification: Outer Main-belt Asteroid          SPK-ID: 2161922
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07701228652377858 3.5494e-08  
a 3.231360355530177 3.4159e-08 au
q 2.982505905968508 1.1265e-07 au
i 15.06355180958689 6.1299e-06 deg
node 52.23927508511465 1.6184e-05 deg
peri 76.17174651640865 4.5086e-05 deg
M 210.5698676162856 4.1766e-05 deg
tp 2460277.167959278236
(2023-Nov-28.66795928)
0.00024755 TDB
period 2121.663551271252
5.81
3.3642e-05
9.211e-08
d
yr
n .1696781753093209 2.6905e-09 deg/d
Q 3.480214805091846 3.679e-08 au
  Orbit Determination Parameters
   # obs. used (total)      634  
   data-arc span      8804 days (24.10 yr)  
   first obs. used      1996-05-14  
   last obs. used      2020-06-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53707  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 20:07:37  

Additional Information
 Earth MOID = 2.04398 au 
 Jupiter MOID = 1.72759 au 
 T_jup = 3.128 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457523.5 (2016-May-15.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07790939062426741 3.5028e-08  
q 2.974944914125456 1.1077e-07 au
tp 2458133.493172391251
(2018-Jan-14.99317239)
0.00024154 TDB
node 52.67317414828246 1.6148e-05 deg
peri 71.94769773181875 4.5003e-05 deg
i 15.11984944381398 6.1343e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      634  
   data-arc span      8804 days (24.10 yr)  
   first obs. used      1996-05-14  
   last obs. used      2020-06-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53707  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 20:07:37  

Additional Information
 Jupiter MOID = 1.72759 au 
 T_jup = 3.128 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.226973979200178E-15 -3.74499859832395E-15 5.074384071456207E-13 2.522756159687019E-15 6.641902172749288E-14 -1.578850816724187E-15
q -3.74499859832395E-15 1.22690548038951E-14 -7.788342340791076E-13 -7.073543352378145E-15 -1.150005147633256E-13 7.760896180675626E-15
tp 5.074384071456207E-13 -7.788342340791076E-13 5.834343580935846E-8 -3.674198882045303E-12 1.015691050890196E-8 -1.003951705322908E-11
node 2.522756159687019E-15 -7.073543352378145E-15 -3.674198882045303E-12 2.607495596123758E-10 -2.523948358530215E-10 -2.755807954501021E-11
peri 6.641902172749288E-14 -1.150005147633256E-13 1.015691050890196E-8 -2.523948358530215E-10 2.025306862999352E-9 2.482538791145759E-11
i -1.578850816724187E-15 7.760896180675626E-15 -1.003951705322908E-11 -2.755807954501021E-11 2.482538791145759E-11 3.763000528486734E-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 14.66   n/a E2021B55  
diameter diameter 5.757 km 1.503 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.111   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

161922 (2007 EA57)          Discovered 2007-Mar-14 by Lowe, A. at Mayhill
Reference: 20070828/Numbers.arcLast Updated: 2007-08-30

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