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7860 Zahnle (1980 PF)
Classification: Main-belt Asteroid          SPK-ID: 2007860
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1618846636234172 4.0009e-08  
a 2.26218774383025 7.752e-09 au
q 1.895974241867273 9.3237e-08 au
i 8.304930543491801 3.8279e-06 deg
node 312.3114303564897 2.1456e-05 deg
peri 17.95879678123546 2.3171e-05 deg
M 307.9696143337308 1.0311e-05 deg
tp 2459380.116379784746
3.6068e-05 TDB
period 1242.771812941377
n .2896750604183373 1.489e-09 deg/d
Q 2.628401245793227 9.007e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1975  
   data-arc span      14605 days (39.99 yr)  
   first obs. used      1980-07-17  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:25:06  

Additional Information
 Earth MOID = .884426 au 
 Jupiter MOID = 2.70702 au 
 T_jup = 3.588 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.08   n/a E2021B10  
diameter diameter 3.429 km 0.242 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.314   0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

7860 Zahnle           Discovered 1980 Aug. 6 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of Kevin J. Zahnle (b. 1955), senior research scientist at NASA Ames Research Center, for many fundamental contributions to understanding the physical nature and size-frequency distributions of minor planets and comets and the implications of their impacts with planets. Zahnle's research has elucidated the physics of atmospheric entry and thus identified the Tunguska object as a stony object, provided critical predictions of the phenomena observed in the 1994 cometary impacts with Jupiter and quantified the expected environmental effects from earth impacts of NEOs over a wide energy range, leading to a determination of the threshold energy for global impact catastrophe. Name suggested and citation provided by D. Morrison.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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