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]
Distance
774 ± 8 ly (237 ± 2 pc)
Absolute magnitude (MV)
−1.22[5]
Details
Mass
3.84[6]M☉
Radius
24[3]R☉
Luminosity
316[5]L☉
Surface gravity (log g)
2.44[6] cgs
Temperature
4,974[6] K
Metallicity [Fe/H]
−0.11[6] dex
Rotational velocity (v sin i)
11.5[7] km/s
Age
191[5] Myr
Other designations
7 Per, BD+56°486, HD 13994, HIP 10729, HR 662, SAO 23149[8]
Database references
SIMBAD
data
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]
^ abcdefCite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
^ abcdeCite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ abcdCite error: The named reference Stock2018 was invoked but never defined (see the help page).
^ abCite error: The named reference Currie2010 was invoked but never defined (see the help page).
^ abcdeCite error: The named reference Takeda2008 was invoked but never defined (see the help page).
^ abcdefCite error: The named reference Liu2014 was invoked but never defined (see the help page).
^Cite error: The named reference Silva2015 was invoked but never defined (see the help page).
^Cite error: The named reference Simbad was invoked but never defined (see the help page).
7Persei is a star in the constellation Perseus, located 774 light years away from the Sun. While the star bears the Bayer designation Chi Persei, it...
consisting of α Persei, γ Persei, δ Persei, η Persei, μ Persei, ψ Persei, 48 Persei and HD 27084. Consequently, the Chinese name for α Persei itself is 天船三...
Chi Persei (Chi Per, χ Persei, χ Per) is the name of a star and an open cluster: χ Persei, the star 7Persei χ Persei, one half of the Double Cluster...
Algol /ˈælɡɒl/, designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the...
Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during...
GK Persei (also Nova Persei 1901) was a bright nova first observed on Earth in 1901. It was discovered by Thomas David Anderson, an Edinburgh clergyman...
S Persei is a red supergiant or hypergiant located near the Double Cluster in Perseus, north of the cluster NGC 869. It is a member of the Perseus OB1...
V520 Persei is a blue supergiant member of NGC 869, one of the Perseus Double Cluster open clusters. It is an irregular variable star. At a magnitude of...
consisting of δ Persei, η Persei, α Persei, γ Persei, ψ Persei, 48 Persei, μ Persei and HD 27084. Consequently, the Chinese name for δ Persei itself is 天船五...
Zeta Persei (ζ Per, ζ Persei) is a star in the northern constellation of Perseus. With an apparent visual magnitude of 2.9, it can be readily seen with...
consisting of γ Persei, η Persei, α Persei, ψ Persei, δ Persei, 48 Persei, μ Persei and HD 27084. Consequently, the Chinese name for γ Persei itself is 天船二...
consisting of Xi Persei, Nu Persei, Epsilon Persei, Zeta Persei, Omicron Persei and 40 Persei. Consequently, the Chinese name for Xi Persei itself is 卷舌三...
consisting of ι Persei, 9 Persei, τ Persei, κ Persei, β Persei, ρ Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for ι Persei itself is 大陵三...
Eta Persei, Gamma Persei, Alpha Persei, Psi Persei, Delta Persei, 48 Persei, Mu Persei and HD 27084. Consequently, the Chinese name for Eta Persei itself...
consisting of ψ Persei, η Persei, α Persei, γ Persei, δ Persei, 48 Persei, μ Persei and HD 27084. Consequently, the Chinese name for ψ Persei itself is 天船四...
consisting of ρ Persei, 9 Persei, τ Persei, ι Persei, κ Persei, β Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for ρ Persei itself is 大陵六...
Epsilon Persei, Latinized from ε Persei, is a multiple star system in the northern constellation of Perseus. It has a combined apparent visual magnitude...
7-A and 7-B. It premiered on Comedy Central on June 20, 2012. A box set containing the 13 episodes of Season 7-A was released as Futurama: Volume 7 and...
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...
RW Persei is a eclipsing binary star system in the northern constellation of Perseus. It has a peak apparent visual magnitude of 9.68, so this system is...
asterism consisting of μ Persei, η Persei, γ Persei, α Persei, ψ Persei, δ Persei, 48 Persei and HD 27084. Consequently, μ Persei itself is known as 天船七...
RT Persei is a variable star system in the northern constellation of Perseus, abbreviated RT Per. It is an eclipsing binary system with an orbital period...
NGC 869 (also known as h Persei) is an open cluster located 7460 light years away in the constellation of Perseus. The cluster is about 14 million years...
Phi Persei (Phi Per, φ Persei, φ Per) is a class B2Vep fourth-magnitude star in the constellation Perseus, location about 720 light-years from Earth....
of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ (chi) Persei, respectively), which are close together in the constellation...
48 Persei (also known as c Persei, 48 Per, HR 1273, HIP 19343, or HD 25940) is a Be star in the constellation Perseus, approximately the 500th brightest...
RS Persei is a red supergiant variable star located in the Double Cluster in Perseus. The star's apparent magnitude varies from 7.82 to 10.0, meaning it...
X Persei is a high-mass X-ray binary system located in the constellation Perseus, approximately 950 parsecs away. It is catalogued as 4U 0352+309 in the...
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