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

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1461569126395977 4.1651e-08  
a 3.125392794849847 2.1243e-08 au
q 2.66859503316855 1.324e-07 au
i 2.534904208274429 4.6773e-06 deg
node 95.33673794164893 0.00011865 deg
peri 180.3143075133464 0.00012035 deg
M 306.1028462469694 2.2182e-05 deg
tp 2457902.647264859786
(2017-May-29.14726486)
0.00012564 JED
period 2018.158803857182
5.53
2.0576e-05
5.633e-08
d
yr
n .1783804125383762 1.8187e-09 deg/d
Q 3.582190556531144 2.4348e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1923  
   data-arc span      28573 days (78.23 yr)  
   first obs. used      1938-01-22  
   last obs. used      2016-04-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49606  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:37:27  

Additional Information
 Earth MOID = 1.65201 au 
 Jupiter MOID = 1.5295 au 
 T_jup = 3.197 
[ 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 11.4 mag n/a MPO250218  
diameter diameter 21.36 km 3.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
rotation period rot_per 10.04 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Addleman, D.; Covele, B.; Duncan, A.; Johnson, J.; et al. (2005) Minor Planet Bul. 32, 76-78.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.1542   0.056 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3

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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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