Kappa Persei
Star in the constellation Perseus
From Wikipedia, the free encyclopedia
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 | |
| Evolutionary stage | red clump[3] |
| Spectral type | G9.5 IIIb[4] |
| U−B color index | +0.83[2] |
| B−V color index | +0.98[2] |
| Astrometry | |
| Radial velocity (Rv) | 27.43±0.42[5] 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[6] |
| Details | |
| Mass | 1.50[7] M☉ |
| Radius | 9[5] R☉ |
| Luminosity | 39.8[7] L☉ |
| Surface gravity (log g) | 2.9[5] cgs |
| Temperature | 4,857±69[7] K |
| Metallicity [Fe/H] | 0.04[5] dex |
| Rotational velocity (v sin i) | 3.0[5] km/s |
| Age | 4.58[7] Gyr |
| Other designations | |
| Misam, Kap Per, κ Per, 27 Persei, BD+44°631, HD 19476, HIP 14668, HR 941, SAO 38609, WDS J03095+4451A[8] | |
| Database references | |
| SIMBAD | data |
The system consists of a spectroscopic binary,[9][6] 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.[10]
Kappa Persei A's two components are designated Kappa Persei Aa (officially named Misam /ˈmaɪzəm/, the traditional name of the entire system)[11] and Ab.
Nomenclature
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).[12]
The traditional name comes from the Arabic مِعْصَم miʽṣam 'wrist'.
In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[14] 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.[11]
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.).[15]
Properties
At its distance, the visual magnitude of Kappa Persei is diminished by an extinction factor of 0.06 due to interstellar dust.[6] It has a relatively high proper motion totaling 0.230 arcseconds per year.[16] 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.[6]
With an estimated age of 4.58 billion years,[7] Kappa Persei Aa is an evolved G-type giant star with a stellar classification of G9.5 IIIb.[4] It is a red clump giant, which means that it is generating energy at its core through the nuclear fusion of helium.[3] The star has about 1.5[7] times the mass of the Sun and 9[5] times the Sun's radius. It radiates 40[7] times the solar luminosity from its outer atmosphere at an effective temperature of 4,857 K.[7]
Kappa Persei B is at an angular separation of 44.10 arc seconds along a position angle of 319°, as of 2009.[10]