HD 133002
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 14h 50m 20.41906s[1] |
| Declination | +82° 30′ 42.9972″[1] |
| Apparent magnitude (V) | 5.65[2] |
| Characteristics | |
| Spectral type | F9 V[3] |
| U−B color index | +0.17[2] |
| B−V color index | +0.638[3] |
| Astrometry | |
| Radial velocity (Rv) | −44.38[3] km/s |
| Proper motion (μ) | RA: +176.85[1] mas/yr Dec.: −223.52[1] mas/yr |
| Parallax (π) | 23.10 ± 0.23[1] mas |
| Distance | 141 ± 1 ly (43.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 2.448[3] |
| Details | |
| HD 133002 A | |
| Mass | 1.51[4] M☉ |
| Surface gravity (log g) | 3.86[5] cgs |
| Temperature | 5,461[5] K |
| Metallicity [Fe/H] | −0.41[6] dex |
| Rotational velocity (v sin i) | 5.2[5] km/s |
| Age | 2.80[4] Gyr |
| HD 133002 B | |
| Mass | 0.15±0.01[7] M☉ |
| Other designations | |
HD 133002 is the Henry Draper Catalogue designation for a star in the northern constellation of Ursa Minor. With an apparent visual magnitude of 5.65,[2] it is faintly visible to the naked eye. (According to the Bortle scale, it can be viewed from dark rural skies.) The high declination of +82.5°[1] means it is hidden from view from most of the southern hemisphere. Parallax measurements made with the Hipparcos spacecraft yield an estimated distance of around 141 light years from the Sun.[1] If it was instead positioned at a distance of 33 ly (10 pc), this would be a second magnitude star.[3]
This is an F-type main sequence star with a stellar classification of F9 V.[3] It is estimated to have 51% greater mass than the Sun, and is younger with an age of around 2.8 billion years.[4] The projected rotational velocity along the star's equator is a relatively leisurely 5.2 km/s.[5] The star is considered a photometric solar analog, although it is deficient in elements more massive than helium when compared to the Sun.[9] The chemical composition and relatively low surface gravity for a star of its classification suggest that this may instead be a subgiant star that is in the process of evolving away from the main sequence.[10] The effective temperature of the star's photosphere is 5,461 K,[5] giving it the yellow-white hue of an F-type star.[11]
This star has been examined for evidence of an infrared excess, but none was detected.[12] During a 2006−2007 survey of nearby stars, it was discovered that HD 133002 has a low-mass common proper motion stellar companion. This object has an estimated 15% of the Sun's mass. It has a projected separation of around 80 AU from the primary, which suggests an orbital period of roughly 700 years. At present, there is insufficient observational data available to determine orbital elements.[7]
References
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- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 5.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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