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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 
[ 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. 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1967-Feb-05 01:00 < 00:01 Jupiter 1.3327915407791 1.33279074407297 1.33279233753852 0.604903785675246 n/a 2439526.541868061 0.964265507149197 474.654501402389 18.2388220558574 85.7323115858646 10897581.9175681 F 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
1977-Aug-13 15:15 < 00:01 Jupiter 1.33793200615689 1.33793141339161 1.33793259907627 0.202967014981217 n/a 2443369.135401710 0.714612873718527 985.886964304665 20.3112905300353 88.7512897768063 9848343.54498327 F 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
2051-May-20 19:46 < 00:01 Jupiter 1.82765221008735 1.82765148199428 1.82765293818104 1.66141384067967 1.35403069555984 2470312.323775944 0.712463935299521 111.396011184071 74.9708601265293 64.151087790886 1663422.1872474 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
2061-Oct-04 13:59 < 00:01 Jupiter 1.2292554777754 1.22925506865217 1.22925588690419 0.68879230344432 n/a 2474102.082739309 0.814994894503047 176.959964236318 13.6711137297009 85.076166381935 13396694.4495189 F 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
2072-Mar-12 00:24 00:02 Jupiter 1.51472825809179 1.51472704723642 1.51472946894806 0.561465927649007 n/a 2477913.516679925 1.52077246975135 94.6066240013535 36.6555300370875 56.6237852615933 5325950.28498471 F 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
2145-Dec-27 20:01 00:03 Jupiter 1.62889635016033 1.62889398576945 1.62889871472814 1.21105178073337 0.653185133737285 2504866.333967380 2.70525664351892 2003.1083860961 403.848102676027 40.7136368171973 1948469.43319654 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
2156-Jun-23 12:54 00:02 Jupiter 1.21669395764839 1.21669349049351 1.21669442480384 0.734235738013625 n/a 2508697.037791063 2.44395561497114 189.142156463473 22.7130430992178 -88.4207230925139 8007512.84346922 F 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56
2166-Oct-06 12:01 00:04 Jupiter 1.71898769479908 1.71898472757066 1.71899066199075 1.50315636327037 1.1287112742889 2512454.000999218 3.76626603333597 926.210582237958 47.5573439476371 8.4705643689484 574017.424132912 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 01:56:20 2020-Dec-18 01:56

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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