115 Thyra
A three-dimensional model of 115 Thyra based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | August 6, 1871 |
| Designations | |
|
Named after
|
Thyra |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 424.287 Gm (2.836 AU) |
| Perihelion | 287.821 Gm (1.924 AU) |
| 356.054 Gm (2.380 AU) | |
| Eccentricity | 0.192 |
| 1341.169 d (3.67 a) | |
|
Average orbital speed
|
19.13 km/s |
| 248.748° | |
| Inclination | 11.600° |
| 308.982° | |
| 96.825° | |
| Physical characteristics | |
| Dimensions | 79.83[2] km |
| Mass | 5.3×1017 kg |
| 0.0223 m/s² | |
| 0.0422 km/s | |
| Albedo | 0.275[2] |
| Temperature | ~180 K |
|
Spectral type
|
S[3] |
| 7.51[2] | |
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[4] 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.[5]
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.[6]
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°).[7] 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.[2]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ *JPL Small-Body Database Browser
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found. See appendix A.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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