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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1493585637108362 5.1373e-08  
a 3.124481318153566 2.3772e-08 AU
q 2.657813276132809 1.5766e-07 AU
i 2.539380799642772 5.564e-06 deg
node 95.48156761142501 0.0001424 deg
peri 179.8253864291374 0.00014409 deg
M 199.7789385173408 2.3601e-05 deg
tp 2457898.305846490029
(2017-May-24.80584649)
0.00013621 JED
period 2017.27601693234
5.52
2.3022e-05
6.303e-08
d
yr
n .1784584741890948 2.0366e-09 deg/d
Q 3.591149360174323 2.7322e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1442  
   data-arc span      27821 days (76.17 yr)  
   first obs. used      1938-01-22  
   last obs. used      2014-03-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52204  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 17:37:19  

Additional Information
 Earth MOID = 1.64287 AU 
 T_jup = 3.196 
[ 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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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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