Asteroids with Satellites Database--Johnston's Archive
(65803)
Didymos
and Dimorphos
compiled by Wm. Robert Johnston
last updated
9 October 2021
--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:
NEA, Apollo
(PHA)
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
1.6443941966 AU
| |
orbital period P: |
2.1087112032 yr
(= 770.206767 d)
| |
eccentricity e: |
0.3836974806
| |
perihelion distance q: |
1.0134442863 AU
| |
aphelion distance Q: |
2.275344107 AU
| |
inclination i: |
3.4077057°
| |
argument of perihelion ω: |
319.318868°
| |
ascending node Ω: |
73.199435°
| |
mean anomaly M: |
136.6502278°
| |
perihelion passage TP: |
2020 Sep 11.6418607
| |
Epoch: |
2021 Jul 01
| |
data arc: |
1996-2021
(1046 obs.)
| |
Earth MOID: |
0.0401437 AU
| |
Jupiter Tisserand invariant TJ: |
4.201
|
orbital data, secondary:
|
binary dynamical type: | A [P07f] | |
semimajor axis as: |
1.19
± 0.03 km
[N20b]
| |
separation/primary radius as/rp: | 3.1 [*D] | |
separation/Hill radius as/rH: | 0.017 [*D] | |
orbital period Ps: |
0.4971
± 0.0004
d [N20b]
| |
eccentricity es: |
<0.05
[N20b]
| |
normalized ang. mom. αL: |
1.16
[P07f]
|
|
other data, system (combined):
|
absolute mag. H: |
18.07
[MPC]
17.7 ± 0.03 [K04a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
0.77
± 0.1
km [*D]
| |
geometric albedo: |
0.16
± 0.04
[P06b]
| |
color index U-B: |
0.211
[K04a]
| |
color index B-V: |
0.795
[K04a]
| |
color index V-R: | 0.458 ± 0.009 [K04a] | |
color index B-R: | 1.253 [K04a] | |
color index V-I: | 0.82 ± 0.009 [K04a] | |
taxonomic type: |
Xk (SMASSII) [JPL]
| |
mass m: |
5.4x1011
± 4x1010
kg [N20b]
| |
density ρ: |
2.17
± 0.35
g/cm3[N20b]
| |
Hill radius rH: |
68 km [*D]
|
other data, primary:
|
diameter dp: |
0.78
± 0.03
km [N20b]
| |
dimensions : | 0.832 x 0.838 x 0.786 km [N20b] | |
axial ratios a/b, b/c: | 1.01, 1.06 [*D] | |
volume : | 0.249± 0.03 km3 [N20b] | |
rotation period RPp: |
2.26
± 0.0001
h [N20b]
| |
amplitude in mag., rotational ΔM: |
0.24
[W14e]
| |
pole direction Β, λ: |
310 ± 20°
,
-84 ± 20°
[N20b]
|
other data, secondary:
|
diameter ds: |
0.17
± 0.03
km [*D]
| |
diameter ratio ds/dp: |
0.22
± 0.02
[P06b]
| |
component mag. difference ΔM: |
3.29
± 0.20
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(65803) Didymos and Dimorphos
--discovery and notes:
Primary discovered
1996 Apr 11
from
Kitt Peak Observatory, Arizona, USA
by
Spacewatch Program.
Alternate designation(s):
1996 GT
.
Permanent number assigned 2003 Sep 10.
Named 2004 Jul 13 for the Greek word for "twin" [MPC052326].
Companion discovered
2003 Nov 20
by P. Pravec, L. A. M. Benner, M. C. Nolan, P. Kusnirak, D. Pray, J. D. Giorgini, R. F. Jurgens, S. J. Ostro, J.-L. Margot, C. Magri, A. Grauer, and S. Larson
using
lightcurve
observations from Ondrejov Observatory, Czech Republic; Jet Propulsion Laboratory; National Astronomy and Ionosphere Center; Ondrejov Observatory, Czech Republic; Greene, Rhode Island, USA; University of California, Los Angeles, California, USA; University of Maine at Farmington, Maine, USA; University of Arkansas at Little Rock, Arkansas, USA; University of Arizona, Arizona, USA.
Announced
2003 Nov 28 [P03b].
Permanent designation I Dimorphos, assigned 2020 Jun 23; named for the Greek word for “having two forms” [MPEC2020M83].
Shape model published [N20b].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Galvez, A., Carnelli, I., Fontaine, M., & Corral Van Damme, C. 2012, European Planetary Science Congress 2012 Asteroid Impact Mission (aim) & Deflection Assessment: AN Opportunity to Understand Impact Dynamics and Modelling
- Fang, Julia & Margot, Jean-Luc 2012, The Astronomical Journal The Role of Kozai Cycles in Near-Earth Binary Asteroids
- Fang, Julia & Margot, Jean-Luc 2012, The Astronomical Journal Binary Asteroid Encounters with Terrestrial Planets: Timescales and Effects
- Fang, Julia & Margot, Jean-Luc 2012, The Astronomical Journal Near-Earth Binaries and Triples: Origin and Evolution of Spin-Orbital Properties
- Benner, Lance A. M., Margot, J., Nolan, M. C., Giorgini, J. D., Brozovic, M., Scheeres, D. J., Magri, C., & Ostro, S. J. 2010, Bulletin of the American Astronomical Society Radar Imaging and a Physical Model of Binary Asteroid 65803 Didymos
- Pravec, Petr & Scheirich, P. 2010, Bulletin of the American Astronomical Society Binary System Candidates for Detection of BYORP
- Scheirich, P. & Pravec, P. 2009, Icarus Modeling of lightcurves of binary asteroids
- Bellerose, J. & Yano, H. 2009, Lunar and Planetary Science Conference Requirements and Constraints for Exploration of Binary Asteroid Systems: From Didymos to Hektor
- Cook, Amanda, Bellerose, J., Rozitis, B., Yamaguchi, T., Mester, C., Murdoch, N., & Marchis, F. 2008, Bulletin of the American Astronomical Society Didymos Explorer: A Mission Concept for Visiting a Binary Asteroid
- Györgyey Ries, J., Varadi, F., Barker, E. S., & Shelus, P. J. 2006, New Horizons in Astronomy: Frank N. Bash Symposium Photometry of Near Earth Asteroids at McDonald Observatory
- Kitazato, K., Abe, M., Nishihara, S., Sarugaku, Y., Kuroda, D., Kinoshita, D., & Ip, W.-H. 2006, 36th COSPAR Scientific Assembly Ground-based observations of near-Earth asteroid mission targets
- Ries, J. G., Barker, E. S., Varadi, F., & Shelus, P. J. 2004, Bulletin of the American Astronomical Society R-Band Photometry of Potentially Hazardous Asteroids at McDonald Observatory
- Kitazato, K., Abe, M., Mito, H., Tarusawa, K., Soyano, T., Nishihara, S., & Sarugaku, Y. 2004, Lunar and Planetary Science Conference Photometric Behaviour Dependent on Solar Phase Angle and Physical Characteristics of Binary Near-Earth-Asteroid (65803) 1996 GT
- Pravec, P., Benner, L. A. M., Nolan, M. C., Kusnirak, P., Pray, D., Giorgini, J. D., Jurgens, R. F., Ostro, S. J., Margot, J.-L., Magri, C., Grauer, A., & Larson, S. 2003, International Astronomical Union Circular (65803) 1996 GT
- Brownlee, J. W., Hergenrother, C. W., Larson, S. M., & Marsden, B. G. 1998, Minor Planet Circulars 1996 GT
- Alday, A., Moore, K., Tranilla, M., Goggia, T., Razo, V., Sylva, A., Ota, M., Fricke, G., Becker, J., Africano, J., Sydney, P., Nishimoto, D., O'Connell, D., Kervin, P., Kraszewski, B., Soo Hoo, V., Montani, J., Scotti, J. V., & Williams, G. V. 1996, Minor Planet Circulars 1996 GT
©
2003-2014, 2021
by Wm. Robert Johnston.
Last modified
9 October 2021.
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