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249461 (2009 HM91)
Classification: Main-belt Asteroid          SPK-ID: 2249461
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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1164929373324625 4.5746e-08  
a 3.047635211891504 2.9141e-08 au
q 2.692607234140421 1.5142e-07 au
i 8.343085308792391 6.6542e-06 deg
node 68.12260061681779 3.4037e-05 deg
peri 264.2529293323849 4.4942e-05 deg
M 290.6060387171921 3.0444e-05 deg
tp 2459375.095089167591
(2021-Jun-09.59508917)
0.00016639 TDB
period 1943.313648730158
5.32
2.7872e-05
7.631e-08
d
yr
n .1852505900091007 2.657e-09 deg/d
Q 3.402663189642588 3.2536e-08 au
  Orbit Determination Parameters
   # obs. used (total)      256  
   data-arc span      8948 days (24.50 yr)  
   first obs. used      1995-12-18  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .63483  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 04:40:17  

Additional Information
 Earth MOID = 1.69875 au 
 Jupiter MOID = 1.96862 au 
 T_jup = 3.211 
[ 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 15.6   n/a MPO437158  
diameter diameter 3.840 km 0.922 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.057   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249461 (2009 HM91)          Discovered 2009-Apr-27 by CSS at Catalina
Reference: 20100824/Numbers.arcLast Updated: 2010-08-27

[ show close-approach data ]
Alternate Designations
 2009 HM91 = 1995 YR8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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