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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2965788035005512 2.6178e-08  
a 3.128120048464433 1.0784e-08 au
q 2.200385947284765 8.2261e-08 au
i 5.419250486664672 3.7897e-06 deg
node 160.4026916006432 3.4243e-05 deg
peri 131.2747052847272 3.476e-05 deg
M 31.15989297991444 6.4711e-06 deg
tp 2458825.589049002730
(2019-Dec-08.08904900)
3.598e-05 TDB
period 2020.800982840536
5.53
1.0449e-05
2.861e-08
d
yr
n .1781471817645132 9.2118e-10 deg/d
Q 4.055854149644101 1.3982e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3293  
   data-arc span      30756 days (84.21 yr)  
   first obs. used      1936-08-25  
   last obs. used      2020-11-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44436  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:56:11  

Additional Information
 Earth MOID = 1.18891 au 
 Jupiter MOID = 1.21624 au 
 T_jup = 3.138 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456632.5 (2013-Dec-06.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2961031849740666 2.6114e-08  
q 2.202835305863208 8.2063e-08 au
tp 2456806.990547515994
(2014-May-29.49054752)
3.4004e-05 TDB
node 160.4590404113209 3.4248e-05 deg
peri 131.6499330311264 3.4771e-05 deg
i 5.417864884653649 3.7892e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3293  
   data-arc span      30756 days (84.21 yr)  
   first obs. used      1936-08-25  
   last obs. used      2020-11-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44436  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:56:11  

Additional Information
 Jupiter MOID = 1.21624 au 
 T_jup = 3.138 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.819527475975567E-16 -2.133893051990374E-15 1.344238994049218E-13 3.358668304190338E-15 1.411454460293696E-14 2.359034987958246E-16
q -2.133893051990374E-15 6.734343051196972E-15 -4.087962499834379E-13 -8.214855534411101E-15 -4.402779768737627E-14 -3.224463155326199E-16
tp 1.344238994049218E-13 -4.087962499834379E-13 1.156296809131884E-9 -3.433583026851819E-13 2.172315267111572E-10 5.580965977014469E-16
node 3.358668304190338E-15 -8.214855534411101E-15 -3.433583026851819E-13 1.172916860132172E-9 -1.167472430253492E-9 2.312258808150096E-11
peri 1.411454460293696E-14 -4.402779768737627E-14 2.172315267111572E-10 -1.167472430253492E-9 1.209029191513623E-9 -2.302301899497433E-11
i 2.359034987958246E-16 -3.224463155326199E-16 5.580965977014469E-16 2.312258808150096E-11 -2.302301899497433E-11 1.435831657210352E-11

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. 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

[ 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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