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19504 Vladalekseev (1998 LL2)
Classification: Main-belt Asteroid          SPK-ID: 2019504
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04501279764109724 5.4208e-08  
a 2.991637433456427 2.7663e-08 AU
q 2.856975463048721 1.5343e-07 AU
i 11.00780843609591 6.0615e-06 deg
node 140.5205955976034 2.5242e-05 deg
peri 45.64563797319756 6.8923e-05 deg
M 138.9328092267574 6.4006e-05 deg
tp 2456271.102649331007
(2012-Dec-09.60264933)
0.00033459 JED
period 1890.000264892548
5.17
2.6215e-05
7.177e-08
d
yr
n .1904761637800442 2.642e-09 deg/d
Q 3.126299403864132 2.8908e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1122  
   data-arc span      8563 days (23.44 yr)  
   first obs. used      1992-03-11  
   last obs. used      2015-08-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48253  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:52:51  

Additional Information
 Earth MOID = 1.87383 AU 
 T_jup = 3.226 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.0 mag n/a MPO263522  
rotation period rot_per 9.4622 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J., in press.]

19504 Vladalekseev           Discovered 1998 June 1 by E. W. Elst at the European Southern Observatory.
Vladmimir Alekseev (b. 1935), a physicist at the Troitsk Institute in Moscow, has searched the Tunguska site for pieces of the impacting body. He made radar measurements up to a depth of 80 meters.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060219/MPCPages.arcLast Updated: 2010-06-03

[ show close-approach data ]
Alternate Designations
 1998 LL2 = 1992 EN3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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