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Theta Persei

θ Persei
Location of θ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 44m 11.98704s[1]
Declination +49° 13′ 42.4111″[1]
Apparent magnitude (V) 4.11[2] / 9.987[3]
Characteristics
θ Per A
Evolutionary stage Main sequence
Spectral type F8 V[4]
U−B color index +0.00[5]
B−V color index +0.49[5]
θ Per B
Spectral type M1.5 V[6]
B−V color index +1.48[7]
Astrometry
Radial velocity (Rv)+24.32[8] km/s
Proper motion (μ) RA: +334.66[1] mas/yr
Dec.: -89.99[1] mas/yr
Parallax (π)89.87 ± 0.22 mas[1]
Distance36.29 ± 0.09 ly
(11.13 ± 0.03 pc)
Absolute magnitude (MV)3.88[9]
Orbit[10]
Period (P)2,720 yr
Semi-major axis (a)22.289″
Eccentricity (e)0.13
Inclination (i)75.44°
Longitude of the node (Ω)128°
Periastron epoch (T)B 1613
Argument of periastron (ω)
(secondary)		100.64°
Details
θ Per A
Mass1.138±0.010[11] M☉
Radius1.319±0.011[11] R☉
Luminosity2.235±0.040[11] L☉
Surface gravity (log g)4.43±0.17[12] cgs
Temperature6,328±86[12] K
Metallicity [Fe/H]−0.03±0.09[12] dex
Age4.0±0.4[11] Gyr
θ Per B
Mass0.521±0.052[3] M☉
Radius0.498±0.017[3] R☉
Temperature3,685±60[3] K
Metallicity [Fe/H]−0.03±0.09[12] dex
Age2.4[3] Gyr
Other designations
θ Per, BD+48°746, GJ 107, CCDM J02441+4913, IDS 02374+4848, WDS J02442+4914
θ Per A: 13 Persei, HR 799, HD 16895, HIP 12777, FK5 93, GC 3277, PPM 45428, SAO 38288
θ Per B: 2MASS J02441025+4913540
Database references
SIMBADθ Per
θ Per A
θ Per B

Theta Persei (Theta Per, θ Persei, θ Per) is a star system 37 light years away from Earth, in the constellation Perseus. It is one of the closest naked-eye stars.

The primary star is a yellowish dwarf (main sequence) star of spectral type F8V, which is somewhat larger and brighter than the Sun, but still within the range considered to have the potential for Earth-like planets. There is also a red dwarf companion of spectral type M1.V, orbiting about 250 AU from the primary. It has a Gaia Data Release 2 parallax of 89.2871±0.1534 mas, corresponding to a distance of 11.2 pc.[13]

An 11th-magnitude star is listed in double-star catalogues as component C of the multiple system. It was 95″ away from component A in 2002,[14] although the separation is rapidly increasing as it is a distant background object with a very different proper motion to the other two stars.[15] An unconfirmed companion, possibly a brown dwarf, was reported 6.2″ from θ Persei B in 2010.[16]

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  16. ^ Cite error: The named reference tanner was invoked but never defined (see the help page).
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