Star system in the constellation Perseus
θ Persei
Location of θ Persei (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Perseus
Right ascension 02h 44m 11.98704s [ 1]
Declination
+49° 13′ 42.4111″[ 1]
Apparent magnitude (V)4.11[ 2] [ 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] Distance 36.29 ± 0.09 ly 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)100.64° Details θ Per A Mass ± 0.010[ 11] M ☉ Radius ± 0.011[ 11] R ☉ Luminosity ± 0.040[ 11] L ☉ Surface gravity (log g )± 0.17[ 12] cgs Temperature ± 86[ 12] K Metallicity [Fe/H] ± 0.09[ 12] dex Age ± 0.4[ 11] Gyr θ Per B Mass ± 0.052[ 3] M ☉ Radius ± 0.017[ 3] R ☉ Temperature ± 60[ 3] K Metallicity [Fe/H] ± 0.09[ 12] dex Age 2.4[ 3] Gyr Other designations θ Per, BD +48°746, GJ 107, CCDM J02441+4913, IDS 02374+4848, WDS J02442+4914θ Per A : 13 Persei, HR 799, HD 16895, HIP 12777, FK5 93, GC 3277, PPM 45428, SAO 38288θ Per B : 2MASS J02441025+4913540Database references SIMBAD θ 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 ± 0.1534 mas pc [ 13]
An 11th-magnitude star is listed in double-star catalogues as component C of the multiple system. It was ″ [ 14] proper motion to the other two stars.[ 15] ″ [ 16]
^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics . 474 (2): 653– 664. arXiv :0708.1752 Bibcode :2007A&A...474..653V . doi :10.1051/0004-6361:20078357 . S2CID 18759600 . ^ Van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars" . The Astrophysical Journal . 694 (2): 1085– 1098. arXiv :0901.1206 Bibcode :2009ApJ...694.1085V . doi :10.1088/0004-637X/694/2/1085 ^ a b c d e Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal . 804 (1): 38. arXiv :1501.01635 Bibcode :2015ApJ...804...64M . doi :10.1088/0004-637X/804/1/64 . S2CID 19269312 . ^ Abt, H. A. (1981). "Visual multiples. VII. MK classifications". The Astrophysical Journal Supplement Series . 45 : 437. Bibcode :1981ApJS...45..437A . doi :10.1086/190719 . ^ a b Hoffleit, D.; Jaschek, C. (1991). The Bright Star Catalogue . New Haven: Yale University Observatory. Bibcode :1991bsc..book.....H . ^ Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. (2015). "CARMENES input catalogue of M dwarfs" (PDF) . Astronomy & Astrophysics . 577 : A128. arXiv :1502.07580 Bibcode :2015A&A...577A.128A . doi :10.1051/0004-6361/201525803 . S2CID 53135130 . [permanent dead link ^ Weis, Edward W. (1999). "Photometry of Late Dwarf Stars" . The Astronomical Journal . 117 (6): 3021– 3024. Bibcode :1999AJ....117.3021W . doi :10.1086/300900 ^ Nidever, David L.; et al. (August 2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series . 141 (2): 503– 522. arXiv :astro-ph/0112477 Bibcode :2002ApJS..141..503N . doi :10.1086/340570 . S2CID 51814894 . ^ Holmberg, J.; et al. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics . 501 (3): 941– 947. arXiv :0811.3982 Bibcode :2009A&A...501..941H . doi :10.1051/0004-6361/200811191 . S2CID 118577511 . ^ Boulé, Cory; Andrews, Kaitlyn; Penfield, Andrew; Puckette, Ian; Goodale, Keith A.; Harfenist, Steven A. (2017). "Determining Binary Star Orbits Using Kepler's Equation" (PDF) . Journal of Double Star Observations . 13 (2): 189. Bibcode :2017JDSO...13..189B . ^ a b c d Boyajian, Tabetha S.; et al. (February 2012). "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars". The Astrophysical Journal . 746 (1): 101. arXiv :1112.3316 Bibcode :2012ApJ...746..101B . doi :10.1088/0004-637X/746/1/101 . S2CID 18993744 . ^ a b c d Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Santos, Nuno C.; Forveille, Thierry; Ségransan, Damien (2005). "Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence" . Astronomy and Astrophysics 442 (2): 635– 642. arXiv :astro-ph/0503260 Bibcode :2005A&A...442..635B . doi :10.1051/0004-6361:20053046 . S2CID 13900901 . ^ Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR .^ Mason, Brian D.; et al. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466– 3471. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 ^ Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR .^ Tanner, Angelle M.; Gelino, Christopher R.; Law, Nicholas M. (2010). "A High-Contrast Imaging Survey ofSIM Lite Planet Search Targets". Publications of the Astronomical Society of the Pacific . 122 (896): 1195– 1206. arXiv :1007.4315 Bibcode :2010PASP..122.1195T . doi :10.1086/656481 . S2CID 118459054 . 
