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9251 Harch (4896 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2009251
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1775059230196853 4.4975e-08  
a 3.110728307084617 1.6209e-08 au
q 2.558555607672099 1.4665e-07 au
i 2.597649711543019 3.7852e-06 deg
node 114.2610404209535 8.7073e-05 deg
peri 234.8367332181065 8.7663e-05 deg
M 328.0650869210327 8.8557e-06 deg
tp 2459178.268491188926
(2020-Nov-24.76849119)
4.9204e-05 TDB
period 2003.971536411107
5.49
1.5663e-05
4.288e-08
d
yr
n .1796432701058821 1.4041e-09 deg/d
Q 3.662901006497135 1.9086e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      21949 days (60.09 yr)  
   first obs. used      1960-09-26  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .553  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:14:58  

Additional Information
 Earth MOID = 1.55334 au 
 Jupiter MOID = 1.76473 au 
 T_jup = 3.193 
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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 14.1   n/a MPO347599  

9251 Harch           Discovered 1960 Sept. 26 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Named in honor of the Cornell University scientist Ann P. Harch, an expert in the design and execution of spacecraft camera sequencing and pointing commands. Ann played a major role in obtaining the first spacecraft images of (951) Gaspra and (243) Ida during the Galileo spacecraft flybys in Oct. 1991 and Aug. 1993. During the latter encounter, she was the first to note evidence for Ida's moon, Dactyl. In addition, Ann was instrumental in the successful imaging of (253) Mathilde and (433) Eros during the NEAR spacecraft flybys in June 1997 and Dec. 1998.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 4896 P-L = 1982 SR3 = 1997 HK12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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