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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2965787962031322 3.2276e-08  
a 3.12812005109697 1.269e-08 au
q 2.20038597196375 1.0408e-07 au
i 5.419253248136807 4.0115e-06 deg
node 160.402659160668 3.7196e-05 deg
peri 131.2747373854114 3.767e-05 deg
M 31.15989222945872 6.7236e-06 deg
tp 2458825.589052994491
(2019-Dec-08.08905299)
3.7261e-05 TDB
period 2020.800985391509
5.53
1.2296e-05
3.366e-08
d
yr
n .1781471815396279 1.084e-09 deg/d
Q 4.055854130230189 1.6453e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2906  
   data-arc span      30593 days (83.76 yr)  
   first obs. used      1936-08-25  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46763  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:21:00  

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

[ show close-approach data ]
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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