106 Dione
Discovery
Discovered byJames Craig Watson
Discovery date10 October 1868
Designations
(106) Dione
Pronunciation/daɪˈoʊniː/[1]
Named after
Dione
A868 TA, 1902 TA
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc145.03 yr (52972 d)
Aphelion3.7032 AU (553.99 Gm)
Perihelion2.64584 AU (395.812 Gm)
3.17451 AU (474.900 Gm)
Eccentricity0.16653
5.66 yr (2065.9 d)
16.61 km/s
51.5257°
0° 10m 27.336s / day
Inclination4.5972°
62.163°
329.725°
Earth MOID1.65175 AU (247.098 Gm)
Jupiter MOID1.73379 AU (259.371 Gm)
TJupiter3.175
Physical characteristics
Dimensions146.59±2.8 km[2]
147.17 ± 3.34[3] km
Mass(3.06 ± 1.54) × 1018 kg[3]
Mean density
1.83 ± 0.92[3] g/cm3
Equatorial surface gravity
0.0410 m/s²
Equatorial escape velocity
0.0775 km/s
16.26 h (0.678 d)[2]
16.26 ± 0.02 h[4]
0.0893±0.003
Temperature~156 K
G (Tholen)
Cgh (Bus)[5]
7.41

Dione (minor planet designation: 106 Dione) is a large main-belt asteroid. It probably has a composition similar to 1 Ceres. It was discovered by J. C. Watson on October 10, 1868,[6] and named after Dione, a Titaness in Greek mythology who was sometimes said to have been the mother of Aphrodite, the Greek goddess of love and beauty. It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.[7] The orbital period for this object is 5.66 years and it has an eccentricity of 0.17.

Measurements made with the IRAS observatory give a diameter of 169.92±7.86 km and a geometric albedo of 0.07±0.01. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 168.72±8.89 km and a geometric albedo of 0.07±0.01. Dione was observed to occult a dim star on January 19, 1983, by observers in Denmark, Germany and the Netherlands. A diameter of 147±3 km was deduced,[8] closely matching the value acquired by the IRAS satellite.[citation needed] As of 2012, the mean diameter derived through occultation measurements is 176.7±0.4 km.[9]

Photometric observations of this asteroid collected during 2004–2005 show a rotation period of 16.26±0.02 hours with a brightness variation of 0.08±0.02 magnitude.[4] It is classified as a rare G-type asteroid, suggesting it has a carbonaceous composition with phyllosilicate minerals also being detected.

One of Saturn's satellites is also named Dione.

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c Yeomans, Donald K., "106 Dione", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
  3. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
  4. ^ a b Pray, Donald P. (September 2005), "Lightcurve analysis of asteroids 106, 752, 847, 1057, 1630, 1670, 1927 1936, 2426, 2612, 2647, 4087, 5635, 5692, and 6235", The Minor Planet Bulletin, 32 (3): 48–51, Bibcode:2005MPBu...32...48P.
  5. ^ DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 22 March 2013. See appendix A.
  6. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
  7. ^ McDonald, Sophia Levy (June 1948), "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group", Astronomical Journal, 53: 199, Bibcode:1948AJ.....53..199M, doi:10.1086/106097.
  8. ^ Kristensen, L. K. (1984), "The diameter of (106) Dione", Astronomische Nachrichten, 305 (4): 207–211, Bibcode:1984AN....305..207K, doi:10.1002/asna.2113050410.
  9. ^ Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", arXiv:1204.1116 [astro-ph.EP]

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