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1182 Ilona (1927 EA)
Classification: Main-belt Asteroid          SPK-ID: 2001182
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 .1171117626844365 4.0144e-08  
a 2.260506379643792 5.5791e-09 au
q 1.995774492964293 9.1842e-08 au
i 9.388994094495375 4.489e-06 deg
node 336.3240071590005 2.2682e-05 deg
peri 62.86051608887566 2.8301e-05 deg
M 258.3952988985737 1.7506e-05 deg
tp 2459350.863078982788
(2021-May-16.36307898)
6.0694e-05 TDB
period 1241.386540844152
3.40
4.5958e-06
1.258e-08
d
yr
n .2899983108848573 1.0736e-09 deg/d
Q 2.52523826632329 6.2325e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2504  
   data-arc span      34074 days (93.29 yr)  
   first obs. used      1927-03-04  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40131  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:27:23  

Additional Information
 Earth MOID = 1.02096 au 
 Jupiter MOID = 2.85717 au 
 T_jup = 3.593 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.6   n/a MPO365257  
diameter diameter 14.162 km 0.257 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 29.8553 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[LeCrone, C.; Addleman, D.; Butler, T.; Hudson, E.; et al. (2005) Minor Planet Bull. 32, 46-48.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Polakis, T. (2018) Minor Planet Bull. 45, 112-115.]
geometric albedo albedo 0.221   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1182 Ilona (1927 EA)          Discovered 1927-Mar-03 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1927 EA = A915 RD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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