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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.


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 
[ 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)		 Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2197-Apr-22 11:44 < 00:01 Eunom 0.034281577632023 0.0342700132788851 0.0342931428366333 8.58880770935281 8.58880766167677 2523609.988857329 0.512741340240689 636.58181212508 33.4960897392698 -25.1160963779812 65376.1583833431 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:14:29 2020-Nov-13 04:14

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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