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JPL Small-Body Database Browser
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9872 Solf (1992 DJ4)
Classification: Main-belt Asteroid          SPK-ID: 2009872
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08740208730617738 3.9999e-08  
a 2.368875231069181 1.0351e-08 au
q 2.161830591305831 9.422e-08 au
i 6.59124557520718 5.3239e-06 deg
node 6.9064224482943 3.522e-05 deg
peri 229.3089760889925 4.6899e-05 deg
M 80.64775653083899 2.9332e-05 deg
tp 2458302.166861331341
0.00010893 TDB
period 1331.716275078877
n .2703278519132593 1.7719e-09 deg/d
Q 2.57591987083253 1.1256e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1327  
   data-arc span      9685 days (26.52 yr)  
   first obs. used      1992-01-31  
   last obs. used      2018-08-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51801  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 16:54:30  

Additional Information
 Earth MOID = 1.1576 au 
 Jupiter MOID = 2.426 au 
 T_jup = 3.532 
[ 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 14.2   n/a MPO435793  
diameter diameter 2.989 km 0.310 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 11.598 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.497   0.155 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

9872 Solf           Discovered 1992 Feb. 27 by F. Borngen at Tautenburg.
Named in honor of Josef K. M. Solf (b. 1934), professor of astronomy at Heidelberg and Jena, and since 1994 director of the Thüringer Landessternwarte Tautenburg. During 1969-1994 he served as staff member of the Max-Planck-Institut für Astronomie at Heidelberg and its Calar Alto Observatory. He is primarily interested in instrumentation for large optical telescopes. A pioneer in using high-resolution long-slit spectroscopic techniques, Solf made important contributions to the study of collimated mass outflows from both young and evolved stars, such as jets from pre-main sequence stars, Herbig-Haro objects, protoplanetary nebulae, nova shells and jets from symbiotic stars and central stars of planetary nebulae.
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
 1992 DJ4 = 1992 FS2 = 1997 XB4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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