Asteroids with Satellites Database--Johnston's Archive
(65489)
Ceto
and Phorcys
compiled by Wm. Robert Johnston
last updated
20 September 2014
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:
Centaur
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
101.903 AU
| |
orbital period P: |
1028.702 yr
(= 375733.2 d)
| |
eccentricity e: |
0.825449
| |
perihelion distance q: |
17.78733 AU
| |
aphelion distance Q: |
186.019 AU
| |
inclination i: |
22.278415°
| |
argument of perihelion ω: |
319.77845°
| |
ascending node Ω: |
171.90476°
| |
mean anomaly M: |
8.6746°
| |
perihelion passage TP: |
1989 Aug 08.27
| |
Epoch: |
2014 May 23
| |
data arc: |
1987-2012
(80 obs.)
| |
Earth MOID: |
16.833 AU
| |
Jupiter Tisserand invariant TJ: |
4.674
|
| Neptune Tisserand invariant TN: | 2.22 [*D] |
orbital data, secondary:
|
semimajor axis as: |
1840
± 44 km
[G07b]
| |
separation/primary radius as/rp: | 17 [*D] | |
separation/Hill radius as/rH: | 0.0071 [*D] | |
orbital period Ps: |
9.554
± 0.011
d [G07b]
| |
eccentricity es: |
0.004
± 0.009
[G07b]
| |
inclination is: | 68.8° ± 2.9° [G07b] | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
6.4
[MPC]
6.54 ± 0.06 [S12a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
281
± 11/11
km [S12a]
| |
geometric albedo: |
0.056
± 0.006/0.006
[S12a]
| |
color index U-B: |
0.23
[J07a]
| |
color index B-V: |
0.86
[T03b]
| |
color index V-R: | 0.56 ± 0.03 [T03b] | |
color index B-R: | 1.42 ± 0.04 [T03b] | |
color index V-I: | 1.12 ± 0.06 [P13c] | |
taxonomic type: |
IR,BR (G-mode) [P13c]
| |
mass m: |
5.41x1018
± 4.2x1017
kg [G07b]
| |
density ρ: |
0.64
± 0.16/0.13
g/cm3[S12a]
| |
Hill radius rH: |
260000 km [*D]
|
other data, primary:
|
diameter dp: |
223
± 10
km [S12a]
| |
axial ratios a/b, b/c: | 1.13, ? [D08b] | |
rotation period RPp: |
4.43
± 0.03
h [D08b]
| |
amplitude in mag., rotational ΔM: |
0.13
± 0.02
[D08b]
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
171
± 10
km [S12a]
| |
diameter ratio ds/dp: |
0.764
± 0.011
[G07b]
| |
component mag. difference ΔM: |
0.56
± 0.03
[G07b]
| |
rotation period RPs: |
?
| |
|
|
--
(65489) Ceto and Phorcys
--discovery and notes:
Primary discovered
2003 Mar 22
from
Palomar Observatory, California, USA
by
C. A. Trujillo and M. E. Brown.
Alternate designation(s):
2003 FX128
.
Linked to prediscovery observations from 1987 Jan 31.
Permanent number assigned 2003 Jun 14.
Named 2006 Nov 09 for the Greek mythological sea creature [MPC57952].
Companion discovered
2006 Apr 11
by K. S. Noll et al.
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2006 Aug [G06e].
Permanent designation I Phorcys, assigned 2006 Nov 09; named for the Greek mythological sea creature [MPC57952].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Perna, D., Dotto, E., Barucci, M. A., Mazzotta Epifani, E., Vilenius, E., Dall'Ora, M., Fornasier, S., & Müller, T. G. 2013, Astronomy and Astrophysics Photometry and taxonomy of trans-Neptunian objects and Centaurs in support of a Herschel key program
- Santos-Sanz, P., Lellouch, E., Fornasier, S., Kiss, C., Pal, A., Müller, T. G., Vilenius, E., Stansberry, J., Mommert, M., Delsanti, A., Mueller, M., Peixinho, N., Henry, F., Ortiz, J. L., Thirouin, A., Protopapa, S., Duffard, R., Szalai, N., Lim, T., Ejeta, C., Hartogh, P., Harris, A. W., & Rengel, M. 2012, Astronomy and Astrophysics "TNOs are Cool": A survey of the trans-Neptunian region. IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS
- Dotto, E., Perna, D., Barucci, M. A., Rossi, A., de Bergh, C., Doressoundiram, A., & Fornasier, S. 2008, Astronomy and Astrophysics Rotational properties of Centaurs and Trans-Neptunian Objects. Lightcurves and densities
- Perna, Davide, Dotto, E., Barucci, A., Rossi, A., de Bergh, C., Doressoundiram, A., & Fornasier, S. 2008, Bulletin of the American Astronomical Society Light Curves and Densities of Centaurs and Trans-Neptunian Objects from the ESO Large Program
- Grundy, W. M., Stansberry, J. A., Noll, K. S., Stephens, D. C., Trilling, D. E., Kern, S. D., Spencer, J. R., Cruikshank, D. P., & Levison, H. F. 2007, Icarus The orbit, mass, size, albedo, and density of (65489) Ceto/Phorcys: A tidally-evolved binary Centaur
- Dotto, Elisabetta, Perna, D., Barucci, M. A., de Bergh, C., Doressoundiram, A., & Fornasier, S. 2007, Bulletin of the American Astronomical Society Rotational Properties of Centaurs and KBOs
- Noll, K. S. 2006, International Astronomical Union Circular (42355), (58534), (65489)
- Grundy, William M., Stansberry, J. A., Noll, K. S., Stephens, D. C., Kern, S. D., Spencer, J. R., Trilling, D. E., Cruikshank, D. P., & Levison, H. F. 2006, Bulletin of the American Astronomical Society The Orbit, Mass, Size, Albedo, and Density of the Binary Centaur (65489) 2003 FX<SUB>128</SUB>
- Stansberry, John A., Cruikshank, D. P., Rieke, G. H., Grundy, W. M., Spencer, J. R., Trilling, D. T., & Noll, K. S. 2006, Bulletin of the American Astronomical Society Thermal Observations of TNOs and Centaurs with Spitzer
©
2006-2008, 2014
by Wm. Robert Johnston.
Last modified
20 September 2014.
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