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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
Additional Information
|
[ show covariance matrix ]
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.DB | Last Updated: 2003-08-29 |
|
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Alternate Designations
| A914 QB = 1930 KH = 1936 QK = 1947 QD = 1953 TT2 |
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