Kappa Persei or κ Persei, is a triple star system in the northern constellation of Perseus. Based upon an annual parallax shift of 28.93 mas,[1] it is located at a distance of 113 light-years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Perseus |
Right ascension | 03h 09m 29.77156s[1] |
Declination | +44° 51′ 27.1463″[1] |
Apparent magnitude (V) | 3.80[2] |
Characteristics | |
Spectral type | G9.5 IIIb[3] |
U−B color index | +0.83[2] |
B−V color index | +0.98[2] |
Astrometry | |
Radial velocity (Rv) | 27.43±0.42[4] km/s |
Proper motion (μ) | RA: +172.99[1] mas/yr Dec.: −143.40[1] mas/yr |
Parallax (π) | 28.93 ± 0.21 mas[1] |
Distance | 112.7 ± 0.8 ly (34.6 ± 0.3 pc) |
Absolute magnitude (MV) | 1.20[5] |
Details | |
Mass | 1.50[6] M☉ |
Radius | 9[4] R☉ |
Luminosity | 39.8[6] L☉ |
Surface gravity (log g) | 2.9[4] cgs |
Temperature | 4,857±69[6] K |
Metallicity [Fe/H] | 0.04[4] dex |
Rotational velocity (v sin i) | 3.0[4] km/s |
Age | 4.58[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The system consists of a spectroscopic binary,[8][5] designated Kappa Persei A, which can be seen with the naked eye, having an apparent visual magnitude of 3.80.[2] The third star, designated Kappa Persei B, is of magnitude 13.50.[9]
Kappa Persei A's two components are designated Kappa Persei Aa (officially named Misam /ˈmaɪzəm/, the traditional name of the entire system)[10] and Ab.
κ Persei (Latinised to Kappa Persei) is the system's Bayer designation. The designations of the two constituents as Kappa Persei A and B, and those of A's components - Kappa Persei Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[11]
The traditional name comes from the Arabic مِعْصَم miʽṣam 'wrist'.
In 2016, the IAU organized a Working Group on Star Names (WGSN)[12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[13] It approved the name Misam for the component Kappa Persei Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[10]
In Chinese, 大陵 (Dà Líng), meaning Mausoleum, refers to an asterism consisting of Kappa Persei, 9 Persei, Tau Persei, Iota Persei, Beta Persei (Algol), Rho Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for Kappa Persei itself is 大陵四 (Dà Líng sì, English: the Fourth Star of Mausoleum.).[14]
At its distance, the visual magnitude of Kappa Persei is diminished by an extinction factor of 0.06 due to interstellar dust.[5] It has a relatively high proper motion totaling 0.230 arcseconds per year.[15] There is a 76.3% chance that it is a member of the Hyades-Pleiades stream of stars that share a common motion through space.[5]
With an estimated age of 4.58 billion years,[6] Kappa Persei Aa is an evolved G-type giant star with a stellar classification of G9.5 IIIb.[3] It is a red clump giant, which means that it is generating energy at its core through the nuclear fusion of helium.[16] The star has about 1.5[6] times the mass of the Sun and 9[4] times the Sun's radius. It radiates 40[6] times the solar luminosity from its outer atmosphere at an effective temperature of 4,857 K.[6]
Kappa Persei B is at an angular separation of 44.10 arc seconds along a position angle of 319°, as of 2009.[9]
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