15 Lyncis

{{Short description|Star in the constellation Lynx}}

{{Starbox begin|name=15 Lyncis}}

{{Starbox observe

|epoch=J2000

|constell=Lynx

|ra={{RA|06|57|16.60526}}{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F.|display-authors=etal|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}}

|dec={{DEC|+58|25|21.9404}}

|appmag_v=4.35{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati, J. R.|year=2002}} (4.7 / 5.8)

}}

{{Starbox character

|class=G8III + F8V{{cite journal|author1=Malkov, O. Yu.|author2=Tamazian, V. S.|author3=Docobo, J. A.|author4=Chulkov, D. A.|date=2012|title=Dynamical Masses of a Selected Sample of Orbital Binaries|journal=Astronomy and Astrophysics|volume=546|id=A69|pages=5|doi=10.1051/0004-6361/201219774|bibcode =2012A&A...546A..69M|doi-access=free}}

|b-v=+0.85{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}

|u-b=+0.51

}}

{{Starbox astrometry

|radial_v={{Val|1.86|0.28}}{{cite journal|bibcode=2008AJ....135..209M|doi=10.1088/0004-6256/135/1/209|title=Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity|journal=The Astronomical Journal|volume=135|issue=1|pages=209–231|year=2008|last1=Massarotti|first1=Alessandro|last2=Latham|first2=David W.|last3=Stefanik|first3=Robert P.|last4=Fogel|first4=Jeffrey|s2cid=121883397 |doi-access=free}}

|prop_mo_ra=6.08

|prop_mo_dec=-122.83

|parallax=18.29

|p_error=0.25

|parallax_footnote=

}}

{{Starbox orbit

|reference={{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|accessdate=30 July 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}

|period=262.0

|axis=1.19

|inclination=78.0

|node=43.4

|periastron=B 1992.68

|eccentricity=0.74

|periarg=98.0

}}

{{Starbox detail

| source =

| component1 = 15 Lyn A

|radius=8

|temperature={{Val|5164|5|fmt=commas}}

|luminosity=40

|gravity=3.0

|metal_fe=0.05

}}

{{Starbox catalog

|names={{odlist|F=15 Lyn|BD=+58° 982|HD=50522|HIP=33449|HR=2560|SAO=26051}}

}}

{{Starbox reference

|Simbad=15+Lyn

}}

{{Starbox end}}

15 Lyncis is a binary star system in the northern constellation of Lynx. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.35. Based on the system's parallax, it is located 178 light-years (54.7 parsecs) away. The pair are moving away from the Earth with a heliocentric radial velocity of +2 km/s.

A telescope reveals it is formed by two yellowish stars of magnitudes 4.7 and 5.8 that are 0.9 arcseconds apart.{{cite book|author=Monks, Neale|title= Go-To Telescopes Under Suburban Skies|url=https://books.google.com/books?id=waO6tUtfblsC&pg=PA58|page=58|isbn=9781441968517|year=2010|publisher=Springer Science & Business Media|location =New York, New York}} The two stars orbit each other every 262 years and the orbital eccentricity is 0.74. The components are a magnitude 4.7 evolved giant star of spectral type G8III, and a magnitude 5.8 F-type main-sequence star of spectral type F8V. The former has exhausted the hydrogen at its core, causing it to expand to 8 times the Sun's radius. It is radiating 40 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,164 K.