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7909 Ziffer (1975 SK)
Classification: Main-belt Asteroid          SPK-ID: 2007909
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1772350485160943 4.6885e-08  
a 3.17114006926555 1.5345e-08 au
q 2.60910290523794 1.4858e-07 au
i 2.38914394181909 4.293e-06 deg
node 69.45529233217141 0.00013078 deg
peri 329.4804179637115 0.00013149 deg
M 31.48599063333213 1.2178e-05 deg
tp 2459216.100044582373
(2021-Jan-01.60004458)
7.0097e-05 TDB
period 2062.631114473937
5.65
1.4972e-05
4.099e-08
d
yr
n .1745343592820842 1.2669e-09 deg/d
Q 3.73317723329316 1.8065e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1712  
   data-arc span      16595 days (45.43 yr)  
   first obs. used      1975-09-30  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49209  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 15:38:01  

Additional Information
 Earth MOID = 1.61668 au 
 Jupiter MOID = 1.68913 au 
 T_jup = 3.176 
[ 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 13.59   n/a MPCxxxxx  
diameter diameter 10.999 km 0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.068   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7909 Ziffer           Discovered 1975 Sept. 30 by S. J. Bus at Palomar.
Julie Ziffer (b. 1974) is a professor of physics at the University of Southern Maine, Portland, ME. Her research contributions include spectroscopic studies of primitive carbonaceous minor planets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

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Alternate Designations
 1975 SK = 1981 WZ8 = 1986 RG13 = 1991 NB5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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