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31203 Hersman (1998 AO9)
Classification: Main-belt Asteroid          SPK-ID: 2031203
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08321028987432609 4.6951e-08  
a 2.920725742672813 1.611e-08 au
q 2.677691306981601 1.4217e-07 au
i 2.638597525251686 5.0401e-06 deg
node 42.71167124251505 8.652e-05 deg
peri 328.2549802757542 9.0053e-05 deg
M 357.1562112114011 2.6155e-05 deg
tp 2459410.902219696261
(2021-Jul-15.40221970)
0.0001325 TDB
period 1823.201185489002
4.99
1.5085e-05
4.13e-08
d
yr
n .1974548957434142 1.6337e-09 deg/d
Q 3.163760178364024 1.7451e-08 au
  Orbit Determination Parameters
   # obs. used (total)      974  
   data-arc span      16029 days (43.89 yr)  
   first obs. used      1976-10-22  
   last obs. used      2020-09-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54996  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:47:00  

Additional Information
 Earth MOID = 1.67706 au 
 Jupiter MOID = 2.27382 au 
 T_jup = 3.273 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456863.5 (2014-Jul-25.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08671716250096624 4.685e-08  
q 2.666353854464472 1.424e-07 au
tp 2457593.787003383437
(2016-Jul-24.28700338)
0.00012327 TDB
node 42.88779920682313 8.6266e-05 deg
peri 329.5467226861944 8.9544e-05 deg
i 2.643468948100559 5.0474e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      974  
   data-arc span      16029 days (43.89 yr)  
   first obs. used      1976-10-22  
   last obs. used      2020-09-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54996  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:47:00  

Additional Information
 Jupiter MOID = 2.27382 au 
 T_jup = 3.273 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.194965112175413E-15 -6.64061255089394E-15 4.654694829324909E-13 -2.16486335162029E-15 1.019513169104247E-13 1.451650720844278E-16
q -6.64061255089394E-15 2.027823027329247E-14 -9.294397042769008E-13 5.065970032673858E-15 -2.288133778190516E-13 -2.712341170411169E-16
tp 4.654694829324909E-13 -9.294397042769008E-13 1.519440370718471E-8 -1.993801684326237E-11 2.971134304764721E-9 -6.101551195264856E-14
node -2.16486335162029E-15 5.065970032673858E-15 -1.993801684326237E-11 7.441890335236919E-9 -7.437679614387887E-9 -3.751861210434787E-11
peri 1.019513169104247E-13 -2.288133778190516E-13 2.971134304764721E-9 -7.437679614387887E-9 8.01805264037182E-9 3.747222159752682E-11
i 1.451650720844278E-16 -2.712341170411169E-16 -6.101551195264856E-14 -3.751861210434787E-11 3.747222159752682E-11 2.547650188266592E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.66   n/a E2021B10  
diameter diameter 3.747 km 0.490 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.199   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

31203 Hersman           Discovered 1998 Jan. 6 by M. W. Buie at the Anderson Mesa station of the Lowell Observatory.
Chris Becker Hersman (b. 1964) is the spacecraft systems engineer of the New Horizons Pluto Kuiper Belt mission. In this role he is making a fundamental contribution to the exploration of the solar system.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040713/MPCPages.arcLast Updated: 2004-07-14

Alternate Designations
 1998 AO9 = 1976 UR10 = 1994 HE1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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