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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 ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1167086015599646 1.912e-08  
a 2.259346179240582 4.9367e-09 au
q 1.995661046221565 4.3864e-08 au
i 9.392489058610492 1.1118e-06 deg
node 336.3133202442289 3.2361e-06 deg
peri 63.08437594415179 6.6308e-06 deg
M 13.055708049313 7.1075e-06 deg
tp 2459351.514709999421
(2021-May-17.01471000)
2.4428e-05 TDB
period 1240.430954724089
3.40
4.0655e-06
1.113e-08
d
yr
n .2902217157907634 9.512e-10 deg/d
Q 2.5230313122596 5.5128e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2973  
   data-arc span      34491 days (94.43 yr)  
   first obs. used      1927-03-04  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38356  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:24:38  

Additional Information
 Earth MOID = 1.02034 au 
 Jupiter MOID = 2.85697 au 
 T_jup = 3.594 
[ 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 11.64   n/a E2021B10  
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. 2020-October); 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.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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