Asteroids with Satellites Database--Johnston's Archive
(42355)
Typhon
and Echidna
compiled by Wm. Robert Johnston
last updated
31 January 2015
--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: |
38.10752321 AU
|
orbital period P: |
235.2471044 yr (= 85924.00487 d)
|
eccentricity e: |
0.540154039
|
perihelion distance q: |
17.52359062 AU
|
aphelion distance Q: |
58.6914558 AU
|
inclination i: |
2.425475766°
|
argument of perihelion ω: |
159.0392585°
|
ascending node Ω: |
351.9128057°
|
mean anomaly M: |
12.26421083°
|
perihelion passage TP: |
2006 May 17.80
|
Epoch: |
2014 May 23
|
data arc: |
1989-2013
(172 obs.)
|
Earth MOID: |
16.535 AU
|
Jupiter Tisserand invariant TJ: |
4.687
|
Neptune Tisserand invariant TN: | 2.682 [*D] |
orbital data, secondary:
semimajor axis as: |
1580
± 20 km
[G14a]
|
separation/primary radius as/rp: | 19.5 [*D] |
separation/Hill radius as/rH: | 0.011 [*D] |
orbital period Ps: |
18.982
± 0.001
d [G14a]
|
eccentricity es: |
0.507
± 0.009
[G14a]
|
inclination is: | 42° ± 2° [G14a] |
ascending node Ωs: | 254° ± 2° [G14a] |
argument of pericenter ωs: | 354° ± 1° [G14a] |
mean anomaly M: | 11° ± 1° [G14a] |
Epoch: | 2006 Sep 21.5 |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
absolute mag. H: |
7.5
[MPC]
7.72 ± 0.04 [S12a]
|
slope parameter G: |
(0.15) [*A]
|
effective diameter dE: |
185
± 7/7
km [S12a]
|
geometric albedo: |
0.044
± 0.003/0.003
[S12a]
|
color index U-B: |
0.21
[J07a]
|
color index B-V: |
0.74
[T03b]
|
color index V-R: | 0.52 ± 0.01 [T03b] |
color index B-R: | 1.26 [T03b] |
color index V-I: | 0.99 ± 0.04 [G08a] |
color index R-J: | 1.31 [*D] |
color index V-J: | 1.83 ± 0.09 [D07c] |
color index J-H: | 0.18 [*D] |
color index V-H: | 2.01 ± 0.05 [D09c] |
taxonomic type: |
BR,BB (G-mode) [P10a]
|
mass m: |
8.7x1017
± 3x1016
kg [G14a]
|
density ρ: |
0.36
± 0.08/0.07
g/cm3[S12a]
|
Hill radius rH: |
140000 km [*D]
|
other data, primary:
diameter dp: |
162
± 7
km [S12a]
|
color index V-I: | 0.99 ± 0.04 [G08a] |
rotation period RPp: |
9.67
h [D09b]
|
amplitude in mag., rotational ΔM: |
0.07
± 0.01
[T10a]
|
pole direction Β, λ: |
?
,
?
|
other data, secondary:
diameter ds: |
89
± 6
km [S12a]
|
diameter ratio ds/dp: |
0.55
± 0.015
[S12a]
|
component mag. difference ΔM: |
1.3
± 0.06
[G08a]
|
color index V-I: | 0.95± 0.04 [G08a] |
rotation period RPs: |
?
|
|
|
--
(42355) Typhon and Echidna
--discovery and notes:
Primary discovered
2002 Feb 05
from
Palomar Observatory, California, USA
by
NEAT.
Alternate designation(s):
2002 CR46
.
Linked to prediscovery observations from 1989 Dec 28.
Permanent number assigned 2002 May 26.
Named 2006 Nov 09 for the Greek mythological monster [MPC57951].
Companion discovered
2006 Jan 20
by K. S. Noll, W. M. Grundy, D. C. Stephens, and H. F. Levison
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2006 Feb 15 [N06c].
Permanent designation I Echidna, assigned 2006 Nov 09; named for the Greek mythological monster [MPC57951].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Stansberry, J. A., Grundy, W. M., Mueller, M., Benecchi, S. D., Rieke, G. H., Noll, K. S., Buie, M. W., Levison, H. F., Porter, S. B., & Roe, H. G. 2012, Icarus Physical properties of trans-neptunian binaries (120347) Salacia-Actaea and (42355) Typhon-Echidna
- 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
- Alvarez-Candal, A., Barucci, M. A., Merlin, F., de Bergh, C., Fornasier, S., Guilbert, A., & Protopapa, S. 2010, Astronomy and Astrophysics The trans-Neptunian object (42355) Typhon: composition and dynamical evolution
- Alvarez-Candal, Alvaro & Barucci, Maria Antonietta 2010, IAU Symposium Water alteration on (42355) Typhon?
- Antonieta Barucci, Maria, Fornasier, S., Alvarez-Cantal, A., de Bergh, C., Merlin, F., DeMeo, F., & Dumas, C. 2009, AAS/Division for Planetary Sciences Meeting Abstracts #41 Surface Properties of TNOs: Preliminary Statistical Analysis
- 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
- Grundy, W. M., Noll, K. S., Virtanen, J., Muinonen, K., Kern, S. D., Stephens, D. C., Stansberry, J. A., Levison, H. F., & Spencer, J. R. 2008, Icarus (42355) Typhon Echidna: Scheduling observations for binary orbit determination
- 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
- 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
- Rieke, George & Stansberry, John 2007, Spitzer Proposal Kuiper Belt Albedoes and Densities
- Noll, K. S. 2006, International Astronomical Union Circular (42355), (58534), (65489)
- Noll, Keith S., Levison, Harold F., Grundy, Will M., & Stephens, Denise C. 2006, Icarus Discovery of a binary Centaur
- 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>
- Noll, K. S., Grundy, W. M., Stephens, D. C., & Levison, H. F. 2006, International Astronomical Union Circular (42355) 2002 CR_46
- Noll, K. S., Grundy, W. M., Stephens, D. C., & Levison, H. F. 2006, Central Bureau Electronic Telegrams (42355) 2002 CR_46
- Stansberry, J. A., Cruikshank, D. P., Grundy, W. G., Margot, J. L., Emery, J. P., Fernandez, Y. R., & Rieke, G. H. 2005, Bulletin of the American Astronomical Society Albedos, Diameters (and a Density) of Kuiper Belt and Centaur Objects
- Ortiz, J. L., Gutiérrez, P. J., Casanova, V., & Sota, A. 2003, Astronomy and Astrophysics A study of short term rotational variability in TNOs and Centaurs from Sierra Nevada Observatory
- Stoss, R. & Marsden, B. G. 2002, Minor Planet Electronic Circulars 2002 CR46
- McNaught, R. H., Stevens, B., Helin, E. F., Pravdo, S., Lawrence, K., Hicks, M., Hovland, E., Bickler, T., Schroeder, J., Scherr, L., Thicksten, R., Deetz, A., Smalley, K., Trentman, R., Scotti, J. V., Laurie, S. P., & Marsden, B. G. 2002, Minor Planet Electronic Circulars 2002 CR46
©
2006-2014, 2015
by Wm. Robert Johnston.
Last modified
31 January 2015.
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