116 Sirona

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[1]
	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° 12m 50.724s / 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	3.9×1017 kg
Equatorial surface gravity	0.0200 m/s2
Equatorial escape velocity	0.0379 km/s
Synodic rotation period	12.028 h (0.5012 d)[1][2]
Geometric albedo	0.2560±0.047
Temperature	~167 K
Spectral type	S
Absolute magnitude (H)	7.82[1][2]

Sirona (minor planet designation: 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.[3]

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.[2] It has the spectrum of an S-type asteroid, suggesting a siliceous composition.

References

Yeomans, Donald K., "116 Sirona", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
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.
Schmadel, Lutz D. (2003), Dictionary of Minor Planet Names (5th ed.), Springer, p. 26, ISBN 3540002383.

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