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7421 Kusaka (1992 HL)
Classification: Main-belt Asteroid          SPK-ID: 2007421
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2039302068683088 3.4014e-08  
a 2.606082104407065 1.1561e-08 au
q 2.074623241739535 8.999e-08 au
i 16.84210682513802 4.2723e-06 deg
node 187.26580377 1.1563e-05 deg
peri 60.93263400891341 1.5327e-05 deg
M 226.1797821125612 1.1786e-05 deg
tp 2459571.715258274698
(2021-Dec-23.21525827)
5.2406e-05 TDB
period 1536.669841263155
4.21
1.0226e-05
2.8e-08
d
yr
n .2342728348882524 1.5589e-09 deg/d
Q 3.137540967074596 1.3919e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1755  
   data-arc span      17281 days (47.31 yr)  
   first obs. used      1972-10-09  
   last obs. used      2020-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:29:02  

Additional Information
 Earth MOID = 1.1176 au 
 Jupiter MOID = 2.00468 au 
 T_jup = 3.323 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457185.5 (2015-Jun-12.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2045773095956472 3.3875e-08  
q 2.071776806787187 8.9571e-08 au
tp 2456500.128267726066
(2013-Jul-26.62826773)
4.3933e-05 TDB
node 187.28826990049 1.1559e-05 deg
peri 61.0135488854018 1.5335e-05 deg
i 16.84808393071658 4.2738e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1755  
   data-arc span      17281 days (47.31 yr)  
   first obs. used      1972-10-09  
   last obs. used      2020-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:29:02  

Additional Information
 Jupiter MOID = 2.00468 au 
 T_jup = 3.323 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.147493321207444E-15 -3.01843111757092E-15 -5.436419336410501E-13 3.049710675310094E-15 -1.279322594607406E-13 2.892537129357197E-15
q -3.01843111757092E-15 8.022902731623966E-15 1.503434020915516E-12 -8.803285819690141E-15 3.612349281666587E-13 -7.153045194143078E-15
tp -5.436419336410501E-13 1.503434020915516E-12 1.930108518428162E-9 -7.880606447242184E-12 4.517932426525446E-10 -4.331671001843721E-13
node 3.049710675310094E-15 -8.803285819690141E-15 -7.880606447242184E-12 1.336045063022752E-10 -1.293574443619069E-10 8.842458691552566E-12
peri -1.279322594607406E-13 3.612349281666587E-13 4.517932426525446E-10 -1.293574443619069E-10 2.351643170052782E-10 -8.515656593897895E-12
i 2.892537129357197E-15 -7.153045194143078E-15 -4.331671001843721E-13 8.842458691552566E-12 -8.515656593897895E-12 1.826519866961228E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5   n/a MPO319178  
diameter diameter 5.740 km 0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 96.5 h n/a LCDB (Rev. 2019-August); 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:
[Galad, A.; Kornos, L.; Vilagi, J. (2010) Minor Planet Bull. 37, 9-15.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.257   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7421 Kusaka           Discovered 1992 Apr. 30 by Y. Kushida and O. Muramatsu at Yatsugatake.
Hideaki Kusaka (1924-1991) was an amateur astronomer who wrote several books on mythology related to constellations and calendars. He worked for a publisher and for the Gotoh Planetarium and Astronomical Museum in Tokyo before appearing frequently on science programs on radio and television.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020526/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1992 HL = 1972 TP9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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