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JPL Small-Body Database Browser
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12975 Efremov (1973 SY5)
Classification: Main-belt Asteroid          SPK-ID: 2012975
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .141234763839183 4.7442e-08  
a 2.587024975293513 9.3299e-09 au
q 2.221647113861865 1.2292e-07 au
i 15.13322960561966 4.8087e-06 deg
node 186.2983131884021 1.3515e-05 deg
peri 217.4993752881636 1.865e-05 deg
M 309.4258211214534 1.1071e-05 deg
tp 2458814.013676413401
(2019-Nov-26.51367641)
4.6543e-05 TDB
period 1519.845209813779
4.16
8.2218e-06
2.251e-08
d
yr
n .2368662266890386 1.2814e-09 deg/d
Q 2.95240283672516 1.0648e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1874  
   data-arc span      16878 days (46.21 yr)  
   first obs. used      1973-09-19  
   last obs. used      2019-12-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46436  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 23:29:51  

Additional Information
 Earth MOID = 1.24428 au 
 Jupiter MOID = 2.52878 au 
 T_jup = 3.359 
[ 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 13.2   n/a MPO358756  
diameter diameter 6.749 km 0.176 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.169   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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