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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2254477002123 2.9083e-08  
a 2.422803625255509 6.8276e-09 au
q 1.876588119875631 7.2505e-08 au
i 1.795574312070955 3.1219e-06 deg
node 227.4414098322967 0.00010705 deg
peri 5.811852372789891 0.00010732 deg
M 314.9945792332098 9.1738e-06 deg
tp 2459172.701953834317
(2020-Nov-19.20195383)
3.5393e-05 TDB
period 1377.449701039098
3.77
5.8226e-06
1.594e-08
d
yr
n .2613525559070716 1.1048e-09 deg/d
Q 2.969019130635387 8.3669e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3329  
   data-arc span      34413 days (94.22 yr)  
   first obs. used      1926-04-14  
   last obs. used      2020-07-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45144  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:14:19  

Additional Information
 Earth MOID = .865593 au 
 Jupiter MOID = 2.03075 au 
 T_jup = 3.477 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456598.5 (2013-Nov-02.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2257459708184269 2.9022e-08  
q 1.876035189037529 7.2375e-08 au
tp 2456417.896898072703
(2013-May-05.39689807)
3.2448e-05 TDB
node 227.5089857333552 0.00010714 deg
peri 5.812960654125728 0.00010741 deg
i 1.794413348905139 3.1214e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3329  
   data-arc span      34413 days (94.22 yr)  
   first obs. used      1926-04-14  
   last obs. used      2020-07-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45144  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:14:19  

Additional Information
 Jupiter MOID = 2.03075 au 
 T_jup = 3.477 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.422915309357707E-16 -2.095616044332127E-15 -3.751826932993225E-14 -2.372730443358263E-15 5.97400947894023E-15 -5.290446007355529E-17
q -2.095616044332127E-15 5.238094480989301E-15 1.050328064063186E-13 7.144827438583244E-15 -1.305202714899949E-14 1.776188979419901E-16
tp -3.751826932993225E-14 1.050328064063186E-13 1.052865627236017E-9 -2.883877453363458E-12 2.606261794783775E-10 2.558731066565923E-13
node -2.372730443358263E-15 7.144827438583244E-15 -2.883877453363458E-12 1.147928432971029E-8 -1.14738269987503E-8 1.045403792982009E-11
peri 5.97400947894023E-15 -1.305202714899949E-14 2.606261794783775E-10 -1.14738269987503E-8 1.153723845199431E-8 -1.03856930487402E-11
i -5.290446007355529E-17 1.776188979419901E-16 2.558731066565923E-13 1.045403792982009E-11 -1.03856930487402E-11 9.743346013460149E-12

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 12.8   n/a MPO358645  
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. 2019-August); 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

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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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