| 2241 Alcathous (1979 WM) |
| Classification: Jupiter Trojan SPK-ID: 2002241 |
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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 65 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .06702943412216812 | 4.6629e-08 | |
| a | 5.178938282553349 | 7.2084e-08 | au |
| q | 4.831796980120165 | 2.5527e-07 | au |
| i | 16.62744142292257 | 4.517e-06 | deg |
| node | 267.9980122485019 | 1.6072e-05 | deg |
| peri | 292.6426878467104 | 3.9914e-05 | deg |
| M | 20.07497036935339 | 3.4695e-05 | deg |
| tp | 2458760.444344305992
(2019-Oct-03.94434431) | 0.00041668 | TDB |
| period | 4304.864936775824
11.79 | 8.9878e-05
2.461e-07 | d
yr |
| n | .08362631703600576 | 1.746e-09 | deg/d |
| Q | 5.526079584986534 | 7.6916e-08 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
8.5 |
|
n/a |
MPO473795 |
IRAS observations used: 3 |
| diameter |
diameter |
113.682 |
km |
1.716 |
urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G) |
|
| rotation period |
rot_per |
7.689 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[French, L.M.; Stephens, R.D.; Lederer, S.M.; Coley, D.R.; Rohl, D.A. (2011) Minor Planet Bull. 38, 116-120.]
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[Stephens, R.D.; French, L.M.; Davitt, C.; Coley, D.R. (2014) Minor Planet Bull. 41, 95-100.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2015) Minor Planet Bull. 42, 216-224.]
[Stephens, R.D.; Coley, D.R.; Warner, B.D.; French, L.M. (2016) Minor Planet Bull. 43, 323-331.]
[Stephens, R.D. (2017) Minor Planet Bull. 44, 123-125.]
[Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 124-128.] |
| geometric albedo |
albedo |
0.048 |
|
0.012 |
urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G) |
|
| B-V |
BV |
0.728 |
|
0.037 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=3; phase (min.=.91, mean=3.88, max.=9.80) deg. |
| U-B |
UB |
0.226 |
|
0.074 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=3; phase (min.=.91, mean=3.88, max.=9.80) deg. |
| Tholen spectral type |
spec_T |
D |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
|
| 2241 Alcathous (1979 WM) Discovered 1979-Nov-22 by Kowal, C. at Palomar |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
Alternate Designations
| 1979 WM = 1950 NC = 1968 WF |
|
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