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JPL Small-Body Database Browser
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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2965787961077334 3.2304e-08  
a 3.128120051207941 1.2701e-08 au
q 2.200385972340229 1.0418e-07 au
i 5.419253375292248 4.0115e-06 deg
node 160.4026594173282 3.7215e-05 deg
peri 131.2747371827177 3.7688e-05 deg
M 31.15989213449871 6.7271e-06 deg
tp 2458825.589053518225
(2019-Dec-08.08905352)
3.7279e-05 TDB
period 2020.800985499043
5.53
1.2307e-05
3.369e-08
d
yr
n .178147181530148 1.085e-09 deg/d
Q 4.055854130075653 1.6468e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2894  
   data-arc span      30360 days (83.12 yr)  
   first obs. used      1936-08-25  
   last obs. used      2019-10-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46846  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:37:09  

Additional Information
 Earth MOID = 1.18891 au 
 Jupiter MOID = 1.21624 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 11.3   n/a MPO313423  
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. 2019-August); 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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