Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1458457119791046 3.1118e-08  
a 3.125687730738115 1.6148e-08 au
q 2.669819578224263 9.7585e-08 au
i 2.534977295490065 3.6113e-06 deg
node 95.32163884626718 8.9324e-05 deg
peri 180.8850407884529 9.0686e-05 deg
M 230.9846734944221 1.847e-05 deg
tp 2459923.861872555084
(2022-Dec-10.36187256)
0.00010629 TDB
period 2018.444483869687
5.53
1.5642e-05
4.283e-08
d
yr
n .1783551655133072 1.3821e-09 deg/d
Q 3.581555883251966 1.8503e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2977  
   data-arc span      30312 days (82.99 yr)  
   first obs. used      1938-01-22  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46457  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:00:09  

Additional Information
 Earth MOID = 1.65156 au 
 Jupiter MOID = 1.53759 au 
 T_jup = 3.197 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456631.5 (2013-Dec-05.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .151221192948126 3.1543e-08  
q 2.647630939844013 9.9447e-08 au
tp 2455882.663599750321
(2011-Nov-17.16359975)
8.9426e-05 TDB
node 95.48114084463437 8.893e-05 deg
peri 179.7054442622183 9.0172e-05 deg
i 2.540803929075475 3.6256e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2977  
   data-arc span      30312 days (82.99 yr)  
   first obs. used      1938-01-22  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46457  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:00:09  

Additional Information
 Jupiter MOID = 1.53759 au 
 T_jup = 3.197 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.949784149499824E-16 -3.10829936067209E-15 1.629060205085917E-13 1.556114932580525E-15 2.924619763006741E-14 5.12109078392664E-17
q -3.10829936067209E-15 9.889720467653151E-15 -2.204405632841156E-13 -6.011722801689951E-15 -3.289340708080735E-14 -7.696069655058937E-17
tp 1.629060205085917E-13 -2.204405632841156E-13 7.997066664210084E-9 -4.385911368126495E-12 1.358902493750289E-9 1.010390804473616E-13
node 1.556114932580525E-15 -6.011722801689951E-15 -4.385911368126495E-12 7.908477406436612E-9 -7.901054186978546E-9 2.027121090365539E-11
peri 2.924619763006741E-14 -3.289340708080735E-14 1.358902493750289E-9 -7.901054186978546E-9 8.13098960553369E-9 -2.023486179067726E-11
i 5.12109078392664E-17 -7.696069655058937E-17 1.010390804473616E-13 2.027121090365539E-11 -2.023486179067726E-11 1.314479099007181E-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 11.54   n/a E2021B10  
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. 2020-October); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Feb-24 19:56 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin