7 Persei

This article is about the star. For the open cluster, see χ Persei.
7 Persei
Location of 7 Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Perseus
Right ascension 02h 18m 04.58449s[1]
Declination +57° 30′ 58.7579″[1]
Apparent magnitude (V) 5.99[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type G7 III[4]
B−V color index 1.039±0.007[2]
Astrometry
Radial velocity (Rv)−12.5±0.3[2] km/s
Proper motion (μ) RA: −13.359[1] mas/yr
Dec.: −1.240[1] mas/yr
Parallax (π)4.2163 ± 0.0437 mas[1]
Distance774 ± 8 ly
(237 ± 2 pc)
Absolute magnitude (MV)−1.22[5]
Details
Mass3.84[6] M☉
Radius24[3] R☉
Luminosity316[5] L☉
Surface gravity (log g)2.44[6] cgs
Temperature4,974[6] K
Metallicity [Fe/H]−0.11[6] dex
Rotational velocity (v sin i)11.5[7] km/s
Age191[5] Myr
Other designations
7 Per, BD+56°486, HD 13994, HIP 10729, HR 662, SAO 23149[8]
Database references
SIMBADdata

7 Persei is a star in the constellation Perseus, located 774 light years away from the Sun.[1] While the star bears the Bayer designation Chi Persei, it is not to be confused with the entire cluster NGC 884, commonly referred to as Chi Persei. It is faintly visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.99.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −12.5 km/s.[2]

This is an evolved giant star with a stellar classification of G7 III,[4] most likely (93% chance) on the horizontal branch.[3] At the age of 191 million years,[5] it has 3.84[6] times the mass of the Sun but has expanded to 24[3] times the Sun's radius. The star is radiating 316[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,974 K.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Stock2018 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Currie2010 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Liu2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Silva2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).