106 Dione

Not to be confused with Saturn's moon Dione.

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.

106 Dione

Discovery
Discovered by	James Craig Watson
Discovery date	10 October 1868
Designations
MPC designation	(106) Dione
Pronunciation	/daɪˈoʊniː/[1]
Named after	Dione
Alternative designations	A868 TA, 1902 TA
Minor planet category	Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	145.03 yr (52972 d)
Aphelion	3.7032 AU (553.99 Gm)
Perihelion	2.64584 AU (395.812 Gm)
Semi-major axis	3.17451 AU (474.900 Gm)
Eccentricity	0.16653
Orbital period (sidereal)	5.66 yr (2065.9 d)
Average orbital speed	16.61 km/s
Mean anomaly	51.5257°
Mean motion	0° 10m 27.336s / day
Inclination	4.5972°
Longitude of ascending node	62.163°
Argument of perihelion	329.725°
Earth MOID	1.65175 AU (247.098 Gm)
Jupiter MOID	1.73379 AU (259.371 Gm)
TJupiter	3.175
Physical characteristics
Dimensions	146.59±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
Synodic rotation period	16.26 h (0.678 d)[2] 16.26 ± 0.02 h[4]
Geometric albedo	0.0893±0.003
Temperature	~156 K
Spectral type	G (Tholen) Cgh (Bus)[5]
Absolute magnitude (H)	7.41

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.

References

1. Noah Webster (1884) A Practical Dictionary of the English Language
2. Yeomans, Donald K., "106 Dione", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
3. 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. 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]

External links

• 106 Dione at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 106 Dione at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters