116 Sirona

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116 Sirona
000116-asteroid shape model (116) Sirona.png
3D convex shape model of 116 Sirona
Discovery
Discovered by Christian Heinrich Friedrich Peters
Discovery date8 September 1871
Designations
(116) Sirona
Pronunciation /ˈsɪrnə/
Named after
Đīrona
A871 RA; 1954 UC3;
1998 EK13; 1998 ES21
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)
2.76741 AU (413.999 Gm)
Eccentricity 0.14244
4.60 yr (1681.5 d)
Average orbital speed
17.81 km/s
7.59231°
0° 12m 50.724s / day
Inclination 3.5635°
63.724°
94.932°
Earth  MOID 1.38451 AU (207.120 Gm)
Jupiter  MOID 1.83156 AU (273.997 Gm)
TJupiter 3.321
Physical characteristics
Dimensions71.70±5.8  km
Mass 3.9×1017 kg
Equatorial surface gravity
0.0200 m/s2
Equatorial escape velocity
0.0379 km/s
12.028  h (0.5012  d) [1] [2]
0.2560±0.047
Temperature ~167 K
S
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.

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    References

    1. 1 2 3 Yeomans, Donald K., "116 Sirona", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory , retrieved 12 May 2016.
    2. 1 2 3 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.