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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.
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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1662498745634749 | 3.0091e-08 | |
| a | 2.586377163995394 | 3.2784e-09 | au |
| q | 2.156392284907324 | 7.8339e-08 | au |
| i | 9.121448017991803 | 3.5008e-06 | deg |
| node | 86.12399134060216 | 2.039e-05 | deg |
| peri | 97.80167192857871 | 2.2946e-05 | deg |
| M | 259.7957123366979 | 1.1023e-05 | deg |
| tp | 2459423.382795547145
(2021-Jul-27.88279555) | 4.6673e-05 | TDB |
| period | 1519.274373852231
4.16 | 2.8887e-06
7.909e-09 | d
yr |
| n | .2369552242806504 | 4.5054e-10 | deg/d |
| Q | 3.016362043083464 | 3.8235e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
6.5 |
|
n/a |
MPO502153 |
|
| 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. 2019-August); 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) |
|
| 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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