theta Persei

{{Starbox begin

| name=θ Persei

}}

{{Starbox image

| image=

{{Location mark

|image=Perseus constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=θ Per

|x=730|y=420

}}

|caption=Location of θ Persei (circled)

}}

{{Starbox observe

| epoch=J2000

| constell=Perseus

| ra={{RA|02|44|11.98704}}

| dec={{DEC|+49|13|42.4111}}

| appmag_v=4.11 / 9.987

}}

{{Starbox character

| component1 = θ Per A

| type=Main sequence

| class=F8 V

| b-v=+0.49

| u-b=+0.00

| component2 = θ Per B

| Red dwarf

| class2=M1.5 V

| b-v2=+1.48

| u-b2=

}}

{{Starbox astrometry

| radial_v=+24.32

| prop_mo_ra=+334.66

| prop_mo_dec=-89.99

| parallax=89.87

| p_error=0.22

| parallax_footnote =

| absmag_v=3.88

}}

{{Starbox orbit

| reference =

| period = 2,720

| axis = 22.289

| eccentricity = 0.13

| inclination = 75.44

| node = 128

| periastron = B 1613

| periarg = 100.64

}}

{{Starbox detail

| component1 = θ Per A

| mass = {{val|1.138|0.010}}

| radius = {{val|1.319|0.011}}

| luminosity = {{val|2.235|0.040}}

| temperature = {{val|6,328|86|fmt=commas}}

| metal_fe = {{val|-0.03|0.09}}

| gravity = {{val|4.43|0.17}}

| rotational_velocity =

| age_gyr = {{val|4.0|0.4}}

| component2 = θ Per B

| mass2 = {{val|0.521|0.052}}

| radius2 = {{val|0.498|0.017}}

| temperature2 = {{val|3,685|60|fmt=commas}}

| luminosity2 =

| metal2_fe = {{val|-0.03|0.09}}

| age_gyr2 = 2.4

}}

{{Starbox catalog

| names = θ Per, BD+48°746, GJ 107, CCDM J02441+4913, IDS 02374+4848, WDS J02442+4914

| component1=θ Per A

| names1=13 Persei, HR 799, HD 16895, HIP 12777, FK5 93, GC 3277, PPM 45428, SAO 38288

| component2=θ Per B

| names2=2MASS J02441025+4913540

}}

{{Starbox reference

|Simbad=**+STF+296AB|sn=θ Per

|Simbad2=theta+Per|sn2=θ Per A

|Simbad3=GJ+107+B|sn3=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 {{val|89.2871|0.1534|ul=mas}}, corresponding to a distance of {{val|11.2|ul=pc}}.

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

References

{{reflist|refs=

{{citation

| display-authors=1 | last1=Holmberg | first1=J.

| last2=Nordström | first2=B. | last3=Andersen | first3=J.

| title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics

| volume=501 | issue=3 |date=July 2009 | pages=941–947

| journal=Astronomy and Astrophysics

| doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H

| arxiv=0811.3982 | s2cid=118577511 | postscript=. }}

{{citation | display-authors=1 | last1=Boyajian | first1=Tabetha S. | last2=McAlister | first2=Harold A. | last3=van Belle | first3=Gerard | last4=Gies | first4=Douglas R. | last5=ten Brummelaar | first5=Theo A. | last6=von Braun | first6=Kaspar | last7=Farrington | first7=Chris | last8=Goldfinger | first8=P. J. | last9=O'Brien | first9=David | last10=Parks | first10=J. Robert | last11=Richardson | first11=Noel D. | last12=Ridgway | first12=Stephen | last13=Schaefer | first13=Gail | last14=Sturmann | first14=Laszlo | last15=Sturmann | first15=Judit | last16=Touhami | first16=Yamina | last17=Turner | first17=Nils H. | last18=White | first18=Russel | title=Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars | journal=The Astrophysical Journal | volume=746 | issue=1 | page=101 |date=February 2012 | doi=10.1088/0004-637X/746/1/101 | bibcode=2012ApJ...746..101B |arxiv = 1112.3316| s2cid=18993744 }}. See Table 10, 12.

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=.

}}

{{citation

| display-authors=1 | last1=Nidever | first1=David L.

| last2=Marcy | first2=Geoffrey W. | last3=Butler | first3=R. Paul

| last4=Fischer | first4=Debra A. | last5=Vogt | first5=Steven S.

| title=Radial Velocities for 889 Late-Type Stars

| journal=The Astrophysical Journal Supplement Series

| volume=141 | issue=2 | pages=503–522 | date=August 2002

| doi=10.1086/340570 | bibcode=2002ApJS..141..503N

| arxiv = astro-ph/0112477 | s2cid=51814894 | postscript=.

}}

{{citation

| display-authors=1

| author=Mason, Brian D.

| author2=Wycoff, Gary L.

| author3=Hartkopf, William I.

| author4=Douglass, Geoffrey G.

| author5=Worley, Charles E.

| title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog

| journal=The Astronomical Journal

| volume=122 | issue=6 | pages=3466–3471 | date=December 2001

| doi=10.1086/323920

| bibcode=2001AJ....122.3466M

| doi-access=free

}}

{{cite journal|bibcode=2015ApJ...804...64M|arxiv=1501.01635|doi=10.1088/0004-637X/804/1/64|title=How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius|author1=Mann, Andrew W.|author2=Feiden, Gregory A.|author3=Gaidos, Eric|author4=Boyajian, Tabetha|author5=von Braun, Kaspar|journal=The Astrophysical Journal|volume=804|issue=1|pages=38|date=2015|s2cid=19269312}}

{{cite journal|doi=10.1086/656481|title=A High-Contrast Imaging Survey ofSIM Lite Planet Search Targets|journal=Publications of the Astronomical Society of the Pacific|volume=122|issue=896|pages=1195–1206|year=2010|last1=Tanner|first1=Angelle M.|last2=Gelino|first2=Christopher R.|last3=Law|first3=Nicholas M.|arxiv=1007.4315|bibcode=2010PASP..122.1195T|s2cid=118459054}}

{{cite journal|author1=Boulé, Cory|author2=Andrews, Kaitlyn|author3=Penfield, Andrew|author4=Puckette, Ian|author5=Goodale, Keith A.|author6=Harfenist, Steven A.|title=Determining Binary Star Orbits Using Kepler's Equation|journal=Journal of Double Star Observations|page=189|volume=13|number=2|date=2017|url=http://www.jdso.org/volume13/number2/Harfenist_189-199.pdf|bibcode = 2017JDSO...13..189B }}

{{cite book |last1=Hoffleit |first1=D. |last2=Jaschek |first2=C. |year=1991 |title=The Bright Star Catalogue |location=New Haven |publisher=Yale University Observatory |bibcode=1991bsc..book.....H}}

{{cite journal |doi=10.1086/300900 |title=Photometry of Late Dwarf Stars |journal=The Astronomical Journal |volume=117 |issue=6 |pages=3021–3024 |year=1999 |last1=Weis |first1=Edward W. |bibcode=1999AJ....117.3021W |doi-access=free }}

{{cite journal |bibcode=1981ApJS...45..437A |title=Visual multiples. VII. MK classifications |journal=The Astrophysical Journal Supplement Series |volume=45 |pages=437 |last1=Abt |first1=H. A. |year=1981 |doi=10.1086/190719 }}

{{cite journal |doi=10.1051/0004-6361/201525803 |title=CARMENES input catalogue of M dwarfs |journal=Astronomy & Astrophysics |volume=577 |pages=A128 |year=2015 |last1=Alonso-Floriano |first1=F. J. |last2=Morales |first2=J. C. |last3=Caballero |first3=J. A. |last4=Montes |first4=D. |last5=Klutsch |first5=A. |last6=Mundt |first6=R. |last7=Cortés-Contreras |first7=M. |last8=Ribas |first8=I. |last9=Reiners |first9=Ansgar |last10=Amado |first10=P. J. |last11=Quirrenbach |first11=A. |last12=Jeffers |first12=S. V. |arxiv=1502.07580 |bibcode=2015A&A...577A.128A |s2cid=53135130 |url=http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/12402/aa25803-15.pdf }}{{Dead link|date=September 2023 |bot=InternetArchiveBot |fix-attempted=yes }}

{{cite journal |doi=10.1051/0004-6361:20053046 |last1=Bonfils |first1=Xavier |last2=Delfosse |first2=Xavier|last3=Udry |first3=Stéphane |last4=Santos |first4=Nuno C. |last5=Forveille |first5=Thierry |last6=Ségransan |first6=Damien |title=Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence |year=2005 |journal=Astronomy and Astrophysics |volume=442 |issue=2 |arxiv=astro-ph/0503260 |bibcode=2005A&A...442..635B |s2cid=13900901 |pages=635–642 |url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...442..635B&db_key=AST&nosetcookie=1 }}

{{cite journal |bibcode=2009ApJ...694.1085V |doi=10.1088/0004-637X/694/2/1085|title=Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars|journal=The Astrophysical Journal|volume=694|issue=2|pages=1085–1098|year=2009|last1=Van Belle|first1=Gerard T.|last2=von Braun|first2=Kaspar|arxiv=0901.1206|doi-access=free}}

}}