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2058 Roka (1938 BH)
Classification: Main-belt Asteroid          SPK-ID: 2002058
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1459082834343468 3.2305e-08  
a 3.12574369631756 1.6976e-08 au
q 2.669671799132135 1.0016e-07 au
i 2.535106182634637 3.7102e-06 deg
node 95.3232956533987 9.4081e-05 deg
peri 180.8285009275472 9.5397e-05 deg
M 195.3885656270423 1.8345e-05 deg
tp 2459923.466570559870
(2022-Dec-09.96657056)
0.00010627 TDB
period 2018.498694621289
5.53
1.6444e-05
4.502e-08
d
yr
n .1783503754346214 1.4529e-09 deg/d
Q 3.581815593502986 1.9453e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2784  
   data-arc span      30193 days (82.66 yr)  
   first obs. used      1938-01-22  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47694  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:37:22  

Additional Information
 Earth MOID = 1.65327 au 
 Jupiter MOID = 1.53804 au 
 T_jup = 3.197 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456338.5 (2013-Feb-15.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1517038665089217 3.2811e-08  
q 2.644875236705446 1.0248e-07 au
tp 2455882.534844122528
(2011-Nov-17.03484412)
8.9483e-05 TDB
node 95.48074680089663 9.3689e-05 deg
peri 179.5747736614295 9.4876e-05 deg
i 2.540843858556595 3.7253e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2784  
   data-arc span      30193 days (82.66 yr)  
   first obs. used      1938-01-22  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47694  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:37:22  

Additional Information
 Jupiter MOID = 1.53804 au 
 T_jup = 3.197 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.076550253635223E-15 -3.331100825004402E-15 8.470487149400611E-14 1.33600364410383E-15 1.051787475468147E-14 8.273052953367087E-17
q -3.331100825004402E-15 1.050302758657494E-14 -2.736582988724952E-14 -5.769809872701562E-15 1.40290822010133E-14 -1.531364330801046E-16
tp 8.470487149400611E-14 -2.736582988724952E-14 8.007271568215043E-9 -6.984928467574656E-12 1.36817443384325E-9 1.33373809840046E-13
node 1.33600364410383E-15 -5.769809872701562E-15 -6.984928467574656E-12 8.777568876772529E-9 -8.769716592953888E-9 -4.558788476741896E-12
peri 1.051787475468147E-14 1.40290822010133E-14 1.36817443384325E-9 -8.769716592953888E-9 9.001479157725121E-9 4.573506090166608E-12
i 8.273052953367087E-17 -1.531364330801046E-16 1.33373809840046E-13 -4.558788476741896E-12 4.573506090166608E-12 1.387808754287515E-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 11.5   n/a MPO492774  
diameter diameter 24.273 km 0.234 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.04 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Addleman, D.; Covele, B.; Duncan, A.; Johnson, J.; et al. (2005) Minor Planet Bull. 32, 76-78.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.120   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2058 Roka           Discovered 1938 Jan. 22 by G. Kulin at Budapest.
Named in memory of Gedeon Roka, a well-known popularizer of astronomy in Hungary for three decades.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5183Last Updated: 2006-03-21

[ show close-approach data ]
Alternate Designations
 1938 BH = 1951 NP = 1962 NA = 1963 UM = 1974 SZ1 = 1978 AE = 1985 UL3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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