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794 Irenaea (A914 QB)
Classification: Main-belt Asteroid          SPK-ID: 2000794
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2964388489296966 1.9065e-08  
a 3.127825731145259 1.0304e-08 au
q 2.200616671751872 5.9862e-08 au
i 5.41929997390477 1.0364e-06 deg
node 160.4028481568912 1.3335e-05 deg
peri 131.2787428544049 1.43e-05 deg
M 66.8026626478088 3.0305e-06 deg
tp 2458825.567125652304
(2019-Dec-08.06712565)
1.563e-05 TDB
period 2020.515791066271
5.53
9.984e-06
2.733e-08
d
yr
n .178172326883929 8.804e-10 deg/d
Q 4.055034790538646 1.3358e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3549  
   data-arc span      30874 days (84.53 yr)  
   first obs. used      1936-08-25  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43529  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:27:13  

Additional Information
 Earth MOID = 1.1872 au 
 Jupiter MOID = 1.21659 au 
 T_jup = 3.138 
[ show covariance matrix ]

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 11.41   n/a E2021B10  
diameter diameter 35.703 km 6.145 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.14 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.046   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

794 Irenaea (A914 QB)          Discovered 1914-Aug-27 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A914 QB = 1930 KH = 1936 QK = 1947 QD = 1953 TT2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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