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1909 Alekhin (1972 RW2)
Classification: Main-belt Asteroid          SPK-ID: 2001909
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2254168656710686 1.3843e-08  
a 2.422621952276291 6.5945e-09 au
q 1.876522105088244 3.6007e-08 au
i 1.795612800557789 1.1097e-06 deg
node 227.4383358396279 2.9085e-05 deg
peri 5.841001543246527 2.9168e-05 deg
M 7.24924067375887 7.9537e-06 deg
tp 2459172.765718650863
(2020-Nov-19.26571865)
3.0367e-05 TDB
period 1377.294772655444
3.77
5.6236e-06
1.54e-08
d
yr
n .2613819547909231 1.0672e-09 deg/d
Q 2.968721799464337 8.081e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3345  
   data-arc span      34413 days (94.22 yr)  
   first obs. used      1926-04-14  
   last obs. used      2020-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4528  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:05:51  

Additional Information
 Earth MOID = .864207 au 
 Jupiter MOID = 2.02997 au 
 T_jup = 3.477 
[ 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 12.82   n/a E2021B10  
diameter diameter 18.681 km 0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 148.6 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Dymock, R. (2009) Minor Planet Bull. 36, 182-183.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.060   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1909 Alekhin (1972 RW2)          Discovered 1972-Sep-04 by Zhuravleva, L. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1972 RW2 = 1926 GU = 1930 KF = 1930 KM = 1934 NZ = 1934 OC = 1941 FJ = 1960 FD = 1969 UU = 1971 DL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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