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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1320772938679288 3.3533e-08  
a 3.186883029462874 1.4475e-08 au
q 2.765968143057791 1.0861e-07 au
i 2.625845268760683 3.5763e-06 deg
node 115.7155863960062 7.5598e-05 deg
peri 197.1256580162469 7.6643e-05 deg
M 220.8707024782913 1.3928e-05 deg
tp 2460003.589048767410
(2023-Feb-28.08904877)
8.1668e-05 TDB
period 2078.009899468922
5.69
1.4157e-05
3.876e-08
d
yr
n .1732426780507664 1.1803e-09 deg/d
Q 3.607797915867957 1.6387e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3283  
   data-arc span      26145 days (71.58 yr)  
   first obs. used      1949-08-24  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45722  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:01:14  

Additional Information
 Earth MOID = 1.75 au 
 Jupiter MOID = 1.6581 au 
 T_jup = 3.183 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456929.5 (2014-Sep-29.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1289743881405866 3.3146e-08  
q 2.783253045647461 1.0653e-07 au
tp 2457919.652692991805
(2017-Jun-15.15269299)
8.1722e-05 TDB
node 115.7497024236976 7.5414e-05 deg
peri 195.6929040586487 7.6531e-05 deg
i 2.625975744029934 3.5773e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3283  
   data-arc span      26145 days (71.58 yr)  
   first obs. used      1949-08-24  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45722  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:01:14  

Additional Information
 Jupiter MOID = 1.6581 au 
 T_jup = 3.183 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.098686741375188E-15 -3.505775584816193E-15 5.75188786436819E-13 2.236978937273989E-15 8.757042630393801E-14 8.780326661638596E-17
q -3.505775584816193E-15 1.134944740095963E-14 -1.727189741346127E-12 -1.202027506818278E-14 -2.758820723057535E-13 -3.663009146963667E-16
tp 5.75188786436819E-13 -1.727189741346127E-12 6.678566330248241E-9 -1.135212323945642E-11 1.079141005760036E-9 -1.654821168639649E-13
node 2.236978937273989E-15 -1.202027506818278E-14 -1.135212323945642E-11 5.687269848701044E-9 -5.682912082562173E-9 6.304170100240013E-11
peri 8.757042630393801E-14 -2.758820723057535E-13 1.079141005760036E-9 -5.682912082562173E-9 5.856997924020313E-9 -6.300276999727166E-11
i 8.780326661638596E-17 -3.663009146963667E-16 -1.654821168639649E-13 6.304170100240013E-11 -6.300276999727166E-11 1.279706721549612E-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

[ show close-approach data ]
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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