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2164 Lyalya (1972 RM2)
Classification: Main-belt Asteroid          SPK-ID: 2002164
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1321879547212083 3.2739e-08  
a 3.186129197524017 1.4135e-08 au
q 2.764961295425793 1.0665e-07 au
i 2.625858381329055 3.4214e-06 deg
node 115.7158128255101 7.5487e-05 deg
peri 197.2243631103748 7.6522e-05 deg
M 254.7258896233975 1.3962e-05 deg
tp 2460003.952858234174
(2023-Feb-28.45285823)
8.1564e-05 TDB
period 2077.272637897358
5.69
1.3823e-05
3.785e-08
d
yr
n .1733041650057051 1.1533e-09 deg/d
Q 3.607297099622242 1.6003e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3481  
   data-arc span      26224 days (71.80 yr)  
   first obs. used      1949-08-24  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44765  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:23:47  

Additional Information
 Earth MOID = 1.75039 au 
 Jupiter MOID = 1.65823 au 
 T_jup = 3.183 
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Orbital Elements at Epoch 2457065.5 (2015-Feb-12.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1299181479098166 3.2499e-08  
q 2.77731256510959 1.0527e-07 au
tp 2457920.787712318564
(2017-Jun-16.28771232)
8.0696e-05 TDB
node 115.7479361408415 7.5384e-05 deg
peri 196.0748411575312 7.6468e-05 deg
i 2.625872018148462 3.4218e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3481  
   data-arc span      26224 days (71.80 yr)  
   first obs. used      1949-08-24  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44765  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:23:47  

Additional Information
 Jupiter MOID = 1.65823 au 
 T_jup = 3.183 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.056156456690026E-15 -3.397826938080503E-15 5.979329096914261E-13 2.220523322440633E-15 9.816749197969467E-14 1.691057186481168E-16
q -3.397826938080503E-15 1.108183527870635E-14 -1.792704689222523E-12 -1.203230047656015E-14 -3.055823590701166E-13 -6.096133863531058E-16
tp 5.979329096914261E-13 -1.792704689222523E-12 6.511838983876428E-9 -1.216570774771694E-11 1.051522390413705E-9 4.481079129514417E-14
node 2.220523322440633E-15 -1.203230047656015E-14 -1.216570774771694E-11 5.682804254114429E-9 -5.678605067486455E-9 6.762177476282552E-11
peri 9.816749197969467E-14 -3.055823590701166E-13 1.051522390413705E-9 -5.678605067486455E-9 5.847283459103444E-9 -6.754621644793809E-11
i 1.691057186481168E-16 -6.096133863531058E-16 4.481079129514417E-14 6.762177476282552E-11 -6.754621644793809E-11 1.170843733886079E-11

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 12.00   n/a E2021B10  
diameter diameter 19.972 km 0.160 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.705 h n/a LCDB (Rev. 2020-October); 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:
[Ditteon, R.; Black, S.; Masner, Z.; Osborne, J.; Trent, L. (2018) Minor Planet Bull. 45, 338-340.]
geometric albedo albedo 0.084   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2164 Lyalya           Discovered 1972 Sept. 11 by N. S. Chernykh at the Crimean Astrophysical Observatory.
Named in memory of Elena (Lyalya) Konstantinovna Ubijvovk (1918-1942), a student in astronomy at Kharkov University who perished with other members of the Resistance during the Great Patriotic War.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5285Last Updated: 2007-10-23

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Alternate Designations
 1972 RM2 = 1949 QF1 = 1953 FJ = 1955 RW = 1955 SB2 = 1976 GO7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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