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116 Sirona

3D convex shape model of 116 Sirona
Discovery
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	8 September 1871
Designations
MPC designation	(116) Sirona
Pronunciation	/ˈsɪroʊnə/
Named after	Đīrona
Alternative designations	A871 RA; 1954 UC3; 1998 EK13; 1998 ES21
Minor planet category	Main belt
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	143.31 yr (52345 d)
Aphelion	3.1616 AU (472.97 Gm)
Perihelion	2.37322 AU (355.029 Gm)
Semi-major axis	2.76741 AU (413.999 Gm)
Eccentricity	0.14244
Orbital period (sidereal)	4.60 yr (1681.5 d)
Average orbital speed	17.81 km/s
Mean anomaly	7.59231°
Mean motion	0° 12 50.724 / day
Inclination	3.5635°
Longitude of ascending node	63.724°
Argument of perihelion	94.932°
Earth MOID	1.38451 AU (207.120 Gm)
Jupiter MOID	1.83156 AU (273.997 Gm)
TJupiter	3.321
Physical characteristics
Dimensions	71.70±5.8 km
Mass	3.9×10 kg
Equatorial surface gravity	0.0200 m/s
Equatorial escape velocity	0.0379 km/s
Synodic rotation period	12.028 h (0.5012 d)
Geometric albedo	0.2560±0.047
Temperature	~167 K
Spectral type	S
Absolute magnitude (H)	7.82

116 Sirona is a somewhat large and bright-colored main-belt asteroid that was discovered by the German-American astronomer C. H. F. Peters on September 8, 1871, and named after Sirona, the Celtic goddess of healing.

This body is orbiting the Sun with a period of 4.60 years and an eccentricity (ovalness) of 0.14. The orbital plane is inclined by 3.56° to the plane of the ecliptic. The cross-section diameter of this object is ~72 km. Photometric observations of this asteroid gave a light curve with a period of 12.028 hours and a brightness variation of 0.42 in magnitude. It has the spectrum of an S-type asteroid, suggesting a siliceous composition.

References

1. ^ Yeomans, Donald K., "116 Sirona", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
2. ^ Zeigler, K. W.; Florence, W. B. (June 1985), "Photoelectric photometry of asteroids 9 Metis, 18 Melpomene, 60 Echo, 116 Sirona, 230 Athamantis, 694 Ekard, and 1984 KD", Icarus, vol. 62, pp. 512–517, Bibcode:1985Icar...62..512Z, doi:10.1016/0019-1035(85)90191-5.
3. Schmadel, Lutz D. (2003), Dictionary of Minor Planet Names (5th ed.), Springer, p. 26, ISBN 3540002383.

External links

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

This article about an S-type asteroid native to the asteroid belt is a stub. You can help Misplaced Pages by expanding it.

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• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Christian Peters
• Named minor planets
• S-type asteroids (Tholen)
• Sk-type asteroids (SMASS)
• Astronomical objects discovered in 1871
• S-type main-belt-asteroid stubs