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25142 Hopf (1998 SA28)
Classification: Main-belt Asteroid          SPK-ID: 2025142
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06583314048912887 4.0948e-08  
a 2.751688048269201 1.4666e-08 au
q 2.570535782405238 1.169e-07 au
i 4.337977608575545 5.5889e-06 deg
node 27.21683392349314 5.7244e-05 deg
peri 279.6568930144501 7.0803e-05 deg
M 248.8796989254687 4.2792e-05 deg
tp 2459115.121743481731
(2020-Sep-22.62174348)
0.00019915 TDB
period 1667.236552294454
4.56
1.3329e-05
3.649e-08
d
yr
n .2159261680680929 1.7263e-09 deg/d
Q 2.932840314133164 1.5632e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1637  
   data-arc span      10321 days (28.26 yr)  
   first obs. used      1991-02-06  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4985  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:20:17  

Additional Information
 Earth MOID = 1.55951 au 
 Jupiter MOID = 2.22431 au 
 T_jup = 3.338 
[ 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 13.6   n/a MPO435936  
diameter diameter 4.890 km 0.220 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.294   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

25142 Hopf           Discovered 1998 Sept. 26 by P. G. Comba at Prescott.
Heinz Hopf (1894-1971), of German origin, was a professor of mathematics at the Swiss Institute of Technology in Zurich. His main contributions were in algebraic topology and global differential geometry.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010804/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Alternate Designations
 1998 SA28 = 1996 LC2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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