HD 81688
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Stern HD 81688 (41 Lyncis, Intercrus) |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Big Bear | ||||||||||||||
| Right ascension | 09 h 28 m 39.99 s | ||||||||||||||
| declination | + 45 ° 36 ′ 5.3 ″ | ||||||||||||||
| Apparent brightness | 5.4 likes | ||||||||||||||
| Typing | |||||||||||||||
| Known exoplanets | 1 | ||||||||||||||
| B − V color index | +0.98 | ||||||||||||||
| U − B color index | +0.74 | ||||||||||||||
| Spectral class | K0 III-IV | ||||||||||||||
| Astrometry | |||||||||||||||
| Radial velocity | (+38.5 ± 0.3) km / s | ||||||||||||||
| parallax | (11.65 ± 0.39) mas | ||||||||||||||
| distance | (280.0 ± 9.4) Lj (85.8 ± 2.9) pc |
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| Visual absolute brightness M vis | approx. +0.7 mag | ||||||||||||||
| Proper movement | |||||||||||||||
| Rec. Share: | (−7.50 ± 0.31) mas / a | ||||||||||||||
| Dec. portion: | (−128.77 ± 0.24) mas / a | ||||||||||||||
| Physical Properties | |||||||||||||||
| Dimensions | 2.1 M ☉ | ||||||||||||||
| radius | 13 R ☉ | ||||||||||||||
| Effective temperature | 4753 K | ||||||||||||||
| Metallicity [Fe / H] | −0.36 | ||||||||||||||
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Other names and catalog entries |
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HD 81688 (also 41 Lyncis or Intercrus ) is about 280 light-years from the sun distant sub-giant in the constellation Ursa Major . It has an apparent brightness of 5.4 mag , which means that it is still visible to the naked eye in a dark, moonless sky with no light pollution .
In 2008, Sato et al. the discovery of an extrasolar planet around this star using the radial velocity method . This bears the systematic name HD 81688 b (or 41 Lyncis b ) and the proper name Arkas . The companion's orbital period is 184 days and its minimum mass is about 2 Jupiter's masses.
The star was given the proper name Intercrus on December 15, 2015 after a public IAU competition to name exoplanets and their central stars . The name proposed by a Japanese association of astronomers means “between the legs” in Latin and indicates the position of the star in the constellation Great Bear.
Web links
Individual evidence
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ a b Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ International Astronomical Union: NameExoWorlds - The Approved Names. Retrieved January 3, 2016 .