Asteroids with Satellites Database--Johnston's Archive
(93)
Minerva, Aegis,
and Gorgoneion
compiled by Wm. Robert Johnston
last updated
21 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:
main belt asteroid
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.754124319 AU
| |
orbital period P: |
4.570708370 yr
(= 1669.4512320 d)
| |
eccentricity e: |
0.141224590
| |
perihelion distance q: |
2.36517424 AU
| |
aphelion distance Q: |
3.143074397 AU
| |
inclination i: |
8.5606727°
| |
argument of perihelion ω: |
274.841096°
| |
ascending node Ω: |
4.075600°
| |
mean anomaly M: |
89.251029°
| |
perihelion passage TP: |
2013 Apr 04.11044
| |
Epoch: |
2014 May 23
| |
data arc: |
1870-2013
(1304 obs.)
| |
Earth MOID: |
1.3678 AU
| |
Jupiter Tisserand invariant TJ: |
3.314
|
orbital data, Aegis:
|
binary dynamical type: | L [M09a] | |
semimajor axis as: |
623.5
± 10 km
[M13c]
| |
separation/primary radius as/rp: | 8.8 [*D] | |
separation/Hill radius as/rH: | 0.021 [*D] | |
orbital period Ps: |
2.406
± 0.002
d [M13c]
| |
eccentricity es: |
0.000
± 0.009
[M13c]
| |
inclination is: | 89.0° ± 10.9° [M13c] | |
ascending node Ωs: | 126° ± 10° [M13c] | |
argument of pericenter ωs: | 82° ± 14.4° [M13c] | |
pericenter passage TP: | 2009 Aug 15.9± 0.1 [M13c] | |
normalized ang. mom. αL: |
0.4
[M09a]
|
orbital data, Gorgoneion:
|
binary dynamical type: | L [M09a] | |
semimajor axis as: |
375
± 16 km
[M13c]
| |
separation/primary radius as/rp: | 5.3 [*D] | |
separation/Hill radius as/rH: | 0.013 [*D] | |
orbital period Ps: |
1.1147
± 0.0006
d [M13c]
| |
eccentricity es: |
0.05
± 0.04
[M13c]
| |
inclination is: | 91.4° ± 24.1° [M13c] | |
ascending node Ωs: | 132.6° ± 23.6° [M13c] | |
argument of pericenter ωs: | 347.5° ± 27.7° [M13c] | |
pericenter passage TP: | 2009 Aug 15.8± 0.08 [M13c] | |
normalized ang. mom. αL: |
0.4
[M09a]
|
|
other data, system (combined):
|
absolute mag. H: |
7.8
[MPC]
7.7 ± 0.2 [M13c]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
141.6
± 4
km [T04c]
| |
geometric albedo: |
0.073
± 0.004
[T04c]
| |
color index U-B: |
0.315
[JPL]
| |
color index B-V: |
0.685
[JPL]
| |
taxonomic type: |
C (SMASSII) [JPL]
CU (Tholen) [JPL]
| |
mass m: |
3.35x1018
± 5.4x1017
kg [M13c]
| |
density ρ: |
1.75
± 0.3
g/cm3[M13c]
| |
Hill radius rH: |
29000 km [*D]
|
other data, primary:
|
diameter dp: |
141.6
± 4
km [T04c]
| |
rotation period RPp: |
5.981767
± 0.000004
h [M13c]
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
21 ± 10°
,
21 ± 10°
[M13c]
|
other data, Aegis:
|
diameter ds: |
3.6
± 1.0
km [M13c]
| |
diameter ratio ds/dp: |
0.028
± 0.014
[*D]
| |
component mag. difference ΔM: |
7.8
[*D]
| |
rotation period RPs: |
?
| |
|
other data, Gorgoneion:
|
diameter ds: |
3.2
± 0.9
km [M13c]
| |
diameter ratio ds/dp: |
0.021
± 0.007
[*D]
| |
component mag. difference ΔM: |
8.4
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(93) Minerva, Aegis, and Gorgoneion
--discovery and notes:
Primary discovered
1867 Aug 24
from
Ann Arbor, Michigan, USA
by
J. C. Watson.
Alternate designation(s):
1949 QN2, A902 DA.
Permanent number assigned 1867.
Named 1867 for the mythological Roman goddess of wisdom.
Second component discovered
2009 Aug 16
by F. Marchis and B. Macomber
using
adaptive optics telescope
observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA.
Announced
2009 Aug 31 [M09c].
Provisional designation S/2009 (93) 1.
Permanent designation I Aegis, assigned 2013 Dec 17; named for the Roman mythological shield [MPC85917].
Third component discovered
2009 Aug 16
by F. Marchis and B. Macomber
using
adaptive optics telescope
observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA.
Announced
2009 Aug 31 [M09c].
Provisional designation S/2009 (93) 2.
Permanent designation II Gorgoneion, assigned 2013 Dec 17; named for the Roman mythological amulet [MPC85917].
Shape model published [M13c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Marchis, F., Vachier, F., Ďurech, J., Enriquez, J. E., Harris, A. W., Dalba, P. A., Berthier, J., Emery, J. P., Bouy, H., Melbourne, J., Stockton, A., Fassnacht, C. D., Dupuy, T. J., & Strajnic, J. 2013, Icarus Characteristics and large bulk density of the C-type main-belt triple asteroid (93) Minerva
- Marchis, F., Emery, J. P., Enriquez, J. E., Descamps, P., Berthier, J., Vachier, F., & Durech, J. 2011, AGU Fall Meeting Abstracts Detailed Pictures of Multiple Asteroid Systems in the Main-Belt
- Timerson, Brad, Durech, J., Abramson, H., Brooks, J., Caton, D., Clark, D., Conard, S., Cooke, B., Dunham, D. W., Dunham, J., Edberg, S., Ellington, C., Faircloth, J., Herchak, S., Iverson, E., Jones, R., Lucas, G., Lyzenga, G., Maley, P., Martinez, L., Menke, J., Mroz, G., Nolan, P., Peterson, R., Preston, S., Rattley, G., Ray, J., Scheck, A., Stamm, J., Stanton, R., Suggs, R., Tatum, R., & Thomas, W. 2011, Minor Planet Bulletin Several Well-observed Asteroidal Occultations in 2010
- Marchis, F., Descamps, P., Dalba, P., Enriquez, J. E., Durech, J., Emery, J. P., Berthier, J., Vachier, F., Merlbourne, J., Stockton, A. N., Fassnacht, C. D., & Dupuy, T. J. 2011, EPSC-DPS Joint Meeting 2011 A Detailed Picture of the (93) Minerva Triple System
- Alton, Kevin B. 2011, Minor Planet Bulletin CCD Lightcurves for 4 Main Belt Asteroids
- Marchis, Franck, Berthier, J., Burns, K. J., Descamps, P., Durech, J., Emery, J. P., Enriquez, J. E., Lainey, V., Reiss, A. E., & Vachier, F. 2010, Bulletin of the American Astronomical Society Characteristics of Known Triple Asteroid Systems in the Main Belt
- Marchis, F., Descamps, P., Berthier, J., Colas, F., Melbourne, J., Stockton, A. N., Fassnacht, C. D., & Dupuy, T. J. 2009, Central Bureau Electronic Telegrams Occultations of the (93) Minerva System
- Marchis, F., Macomber, B., Berthier, J., Vachier, F., & Emery, J. P. 2009, International Astronomical Union Circular S/2009 (93) 1 and S/2009 (93) 2
- López-González, M. J. & Rodríguez, E. 2009, Revista Mexicana de Astronomia y Astrofisica Conference Series Photometry of six asteroids
- Torppa, J., Hentunen, V.-P., Pääkkönen, P., Kehusmaa, P., & Muinonen, K. 2008, Icarus Asteroid shape and spin statistics from convex models
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System 93 Minerva CCD Spectrum
- Tungalag, N., Shevchenko, V. G., & Lupishko, D. F. 2002, Kinematika i Fizika Nebesnykh Tel Rotation parameters and shapes of 15 asteroids
- Denchev, P. 2000, Planetary and Space Science Photometry of 11 asteroids during their 1998 and 1999 apparitions
- Millis, R. L., Wasserman, L. H., Bowell, E., Franz, O. G., Nye, R., Osborn, W., & Klemola, A. 1985, Icarus The occultation of AG + 29 deg 398 by 93 Minerva
- Wasserman, L. H., Millis, R. L., Bowell, E., Franz, O. G., & Osborn, W. 1983, Bulletin of the American Astronomical Society The Occultation Diameters of 375 Ursula and 93 Minerva
- Sicardy, B., Laques, P., Lecacheux, J., Vedere, J. J., Le Borgne, J. F., Baroni, S., Cavagna, M., & Gualdoni, C. 1982, International Astronomical Union Circular Occultation of BD +29 579 by (93) Minerva
- Debehogne, H., Lagerkvist, C.-I., & Zappala, V. 1982, Astronomy and Astrophysics Supplement Series Physical studies of asteroids. VIII - Photoelectric photometry of the asteroids 42, 48, 93, 105, 145 and 245
- Lagerkvist, C.-I. 1981, Astronomy and Astrophysics Supplement Series Physical studies of asteroids II - Photoelectric observations of the asteroids 63, 93, 135 and 409
- 1978, The Astronomer Asteroidal notes
- 1977, The Astronomer Asteroid notes
- Millosevich, Elia 1902, Astronomische Nachrichten Beobachtungen des Planeten 1902 HQ = (93) Minerva
- Eichelberger, W. S. 1897, The Astronomical Journal Ephemeris of asteroid (93) Minerva
©
2009, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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