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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .140731429975713 7.3774e-08  
a 2.587993059760907 2.413e-08 AU
q 2.223781095693534 1.8656e-07 AU
i 15.1414944740633 9.2775e-06 deg
node 186.3564511376912 2.3125e-05 deg
peri 216.5069057427578 3.8983e-05 deg
M 244.372994124181 3.8232e-05 deg
tp 2457288.927228841217
(2015-Sep-23.42722884)
0.00016577 JED
period 1520.698396114138
4.16
2.1268e-05
5.823e-08
d
yr
n .2367333331316144 3.3108e-09 deg/d
Q 2.95220502382828 2.7525e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      781  
   data-arc span      14480 days (39.64 yr)  
   first obs. used      1973-09-19  
   last obs. used      2013-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50789  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 20:31:21  

Additional Information
 Earth MOID = 1.2447 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 13.0 mag n/a MPO263465  

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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