Iota Persei

ι Persei, Latinized as Iota Persei, is a single^[10] star in the northern constellation Perseus. This object is visible to the naked eye as a faint, yellow-white hued point of light with an apparent visual magnitude of 4.1.^[2] It is located 34.5 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +49 km/s.^[1] Iota Persei has a relatively high proper motion across the sky.^[9]

ι Persei in optical light

Iota Persei

Location of ι Persei (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	03h 09m 04.019s[1]
Declination	+49° 36′ 47.80″[1]
Apparent magnitude (V)	4.062[2]
Characteristics
Evolutionary stage	Main sequence
Spectral type	G0V[3] or F9.5 V[4]
U−B color index	+0.119[2]
B−V color index	+0.595[2]
Astrometry
Radial velocity (Rv)	49.47±0.12[1] km/s
Proper motion (μ)	RA: +1,265.475 mas/yr[1] Dec.: −91.50 mas/yr[1]
Parallax (π)	94.5412±0.1448 mas[1]
Distance	34.50 ± 0.05 ly (10.58 ± 0.02 pc)[1]
Absolute magnitude (MV)	3.94[5]
Details[6]
Mass	1.08 – 1.1 M☉
Radius	1.417 R☉
Luminosity	2.22 L☉
Surface gravity (log g)	4.17 cgs
Temperature	5,921 K
Metallicity [Fe/H]	+0.09 dex
Rotational velocity (v sin i)	4.1[7] km/s
Age	3.2–4.1[7][8] Gyr
Other designations
ι Per, BD+49°857, FK5 112, GC 3740, GJ 124, HD 19373, HIP 14632, HR 937, SAO 38597, PPM 45875, CCDM J03091+4936A, WDS J03091+4937A[9]
Database references
SIMBAD	data

This is a late F- or early G-type main-sequence star with a stellar classification of around G0V.^[3] It is about 3–4^[7][8] billion years old and is spinning slowly with a projected rotational velocity of 4 km/s.^[7] The star has 1.1 times the mass of the Sun and 1.4 times the Sun's radius. It is radiating more than double the luminosity of the Sun from its photosphere at an effective temperature of 5,921 K.^[6]

There is a 12.4-magnitude line-of-sight companion star that is not believed to be gravitationally associated with Iota Persei.^[10] This object is located at an angular separation of 154.4″ from the primary along a position angle of 125°, as of 2014.^[11]

Naming

In Chinese, 大陵 (Dà Líng), meaning Mausoleum, refers to an asterism 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 (Dà Líng sān, English: the Third Star of Mausoleum).^[12]