Supriya Ghosh (Editor)

115 Thyra

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Discovered by  James Craig Watson
Minor planet category  Main belt
Aphelion  2.8376 AU (424.50 Gm)
Orbits  Sun
Discoverer  James Craig Watson
Discovery site  Detroit Observatory
Discovery date  6 August 1871
Observation arc  143.31 yr (52344 d)
Discovered  6 August 1871
Spectral type  S-type asteroid
Named after  Thyra
115 Thyra
Perihelion  1.92394 AU (287.817 Gm)
Similar  114 Kassandra, 40 Harmonia, 121 Hermione, 230 Athamantis, 196 Philomela

115 Thyra is a fairly large and bright inner main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on August 6, 1871 and was named for Thyra, the consort of King Gorm the Old of Denmark. Based upon its spectrum, it is categorized as a stony S-type asteroid.

Observations made between 1978 and 1981 produced a composite light curve with two minima and maxima. However, a subsequent study in 1983 only found a single minima and maxima. A synodical rotation period of 7.241 hours was determined. This was confirmed by observations between 1995 and 2000. The changes in brightness and color indicate a surface with an uneven composition.

The asteroid has a slightly elongated shape, with a ratio of 1.20 between the lengths of the major and minor axes. The orbital longitude and latitude of the asteroid pole in degrees is estimated to be (λ0, β0) = (68°, 23°). Measurements of the thermal inertia of 115 Thyra give a value of around 75 m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.


115 Thyra Wikipedia

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