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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 90 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .1661570744186088 | 3.0006e-08 | |
a | 2.586724335555877 | 3.2828e-09 | au |
q | 2.156921787632492 | 7.8153e-08 | au |
i | 9.120760668894773 | 3.4939e-06 | deg |
node | 86.12377168591323 | 2.0222e-05 | deg |
peri | 97.75090806380918 | 2.2794e-05 | deg |
M | 307.2219149495103 | 1.0971e-05 | deg |
tp | 2459423.279270796009 (2021-Jul-27.77927080) | 4.6384e-05 | TDB |
period | 1519.580284313837 4.16 | 2.8927e-06 7.92e-09 | d yr |
n | .2369075222389827 | 4.5099e-10 | deg/d |
Q | 3.016526883479261 | 3.8282e-09 | au |
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| | Orbit Determination Parameters
Additional Information
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[ show covariance matrix ]
Physical Parameter Table
Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
absolute magnitude |
H |
6.49 |
|
n/a |
E2021B10 |
|
diameter |
diameter |
152 |
km |
n/a |
Dunham occult. list: Dunham 1998: 167x139 km |
Yeomans E-mail 2001-Apr-04 |
rotation period |
rot_per |
15.028 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List: [Bel'skaya, I.N.; Dovgopol, A.N.; Erikson, A.; Lagerkvist, C.-I.; Oja, T. (1993) Astron. Astrophys. Suppl. Ser. 101, 507-511.] [Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Aymami, J.M. (2012) Minor Planet Bull. 39, 179-181.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] |
geometric albedo |
albedo |
0.159 |
|
n/a |
EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD |
TRIAD quality code 3 |
B-V |
BV |
0.833 |
|
0.018 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=13; phase (min.=1.04, mean=8.54, max.=23.04) deg. |
U-B |
UB |
0.388 |
|
0.031 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=10; phase (min.=1.04, mean=8.02, max.=23.04) deg. |
Tholen spectral type |
spec_T |
S |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
SMASSII spectral type |
spec_B |
S |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) |
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14 Irene (A851 KA) Discovered 1851-May-19 by Hind, J. R. at London |
Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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Alternate Designations
A851 KA = 1952 TM = A906 QC = A913 EA |
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