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12975 Efremov (1973 SY5)
Classification: Main-belt Asteroid          SPK-ID: 2012975
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1403641377310562 7.0691e-08  
a 2.587538600858251 1.5137e-08 au
q 2.224340976302959 1.775e-07 au
i 15.14370132533631 6.4139e-06 deg
node 186.3476585134927 2.1267e-05 deg
peri 216.5892231589746 2.8933e-05 deg
M 73.71436732306161 1.7605e-05 deg
tp 2457289.200570707700
(2015-Sep-23.70057071)
7.4725e-05 JED
period 1520.297855288892
4.16
1.3341e-05
3.653e-08
d
yr
n .2367957033864206 2.0779e-09 deg/d
Q 2.950736225413544 1.7262e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1115  
   data-arc span      15536 days (42.54 yr)  
   first obs. used      1973-09-19  
   last obs. used      2016-04-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47039  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:15:26  

Additional Information
 Earth MOID = 1.24522 au 
 Jupiter MOID = 2.52908 au 
 T_jup = 3.359 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2 mag n/a MPO358756  

12975 Efremov           Discovered 1973 Sept. 28 by N. S. Chernykh at the Crimean Astrophysical Observatory.
Yurij Nikolaevich Efremov (b. 1937) is a leading research scientist at the Sternberg Astronomical Institute, Moscow University. His works on variable stars and star-formation regions are well known. He discovered the period-age relationship for cepheids and created the concept of large complexes of young stars.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050721/MPCPages.arcLast Updated: 2005-07-21

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Alternate Designations
 1973 SY5 = 1977 RH4 = 1998 RM59 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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