115 Thyra
Synodic rotation period | 7.241 h (0.3017 d) | |
| 0.2747±0.010[2] 0.275[3] | ||
| Temperature | ~180 K | |
| S[4] | ||
| 7.51[2][3] | ||
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[5] 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.[6]
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.[7]
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°).lunar regolith and 400 for coarse sand in an atmosphere.[3]
References
- ^ From 'Tyra', a variant of the name.
- ^ NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- ^ S2CID 14517561.
- ^ *JPL Small-Body Database Browser
- ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
- doi:10.1016/j.icarus.2009.02.005, archived from the original(PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.
- .
- .
External links
- 115 Thyra at AstDyS-2, Asteroids—Dynamic Site
- 115 Thyra at the JPL Small-Body Database
