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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2254477004793956 2.9085e-08  
a 2.422803625374356 6.8284e-09 au
q 1.876588119320565 7.2507e-08 au
i 1.79557426057663 3.1223e-06 deg
node 227.4414082281621 0.00010706 deg
peri 5.811854080121975 0.00010733 deg
M 314.9945790473389 9.1757e-06 deg
tp 2459172.701954558176
(2020-Nov-19.20195456)
3.5401e-05 TDB
period 1377.449701140452
3.77
5.8233e-06
1.594e-08
d
yr
n .2613525558878412 1.1049e-09 deg/d
Q 2.969019131428148 8.3679e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3323  
   data-arc span      34394 days (94.17 yr)  
   first obs. used      1926-04-14  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45128  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:38:36  

Additional Information
 Earth MOID = .865593 au 
 Jupiter MOID = 2.03075 au 
 T_jup = 3.477 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456597.5 (2013-Nov-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2257460887852335 2.9024e-08  
q 1.876036548629474 7.2377e-08 au
tp 2456417.897399166749
(2013-May-05.39739917)
3.2452e-05 TDB
node 227.5089898062288 0.00010715 deg
peri 5.813184996697477 0.00010742 deg
i 1.794413342951023 3.1218e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3323  
   data-arc span      34394 days (94.17 yr)  
   first obs. used      1926-04-14  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45128  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:38:36  

Additional Information
 Jupiter MOID = 2.03075 au 
 T_jup = 3.477 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.423696390551145E-16 -2.09578213843679E-15 -3.736549607789389E-14 -2.376049667993758E-15 6.00770944428714E-15 -5.293257261323321E-17
q -2.09578213843679E-15 5.238446722986652E-15 1.047044129152037E-13 7.15469940751235E-15 -1.312705804033549E-14 1.77766711928011E-16
tp -3.736549607789389E-14 1.047044129152037E-13 1.053162364932339E-9 -2.873028924652466E-12 2.606736693380714E-10 2.563728421698728E-13
node -2.376049667993758E-15 7.15469940751235E-15 -2.873028924652466E-12 1.148134979533189E-8 -1.147588889864534E-8 1.052093448055267E-11
peri 6.00770944428714E-15 -1.312705804033549E-14 2.606736693380714E-10 -1.147588889864534E-8 1.153930822299057E-8 -1.045244514431716E-11
i -5.293257261323321E-17 1.77766711928011E-16 2.563728421698728E-13 1.052093448055267E-11 -1.045244514431716E-11 9.745499251350797E-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

[ 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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