Gamma Reticuli
{{Short description|Variable star in the constellation Reticulum}}
{{Starbox begin
| name = Gamma Reticuli
}}
{{Starbox image
| image =
| caption=Location of γ Reticuli (circled)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Reticulum
| dec = {{DEC|−62|09|33.4250}}
}}
{{Starbox character
| type = asymptotic giant branch
| r-i =
| variable = SR
}}
{{Starbox astrometry
| parallax = 6.95
| p_error = 0.11
}}
{{Starbox detail
| source =
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = γ Ret, CD−62° 149, HD 25705, HIP 18744, HR 1264, SAO 248925.
}}
{{Starbox reference
| Simbad = gam+Ret
}}
{{Starbox end}}
Gamma Reticuli (Gamma Ret, γ Reticuli, γ Ret) is a solitary star in the southern constellation of Reticulum. With an apparent visual magnitude of 4.5, it can be faintly seen with the naked eye. Based upon an annual parallax shift of 6.95 mas, it is located roughly 469 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.
File:GammaRetLightCurve.png for Gamma Reticuli, plotted from Hipparcos data]]
This is an evolved red giant star, currently on the asymptotic giant branch, with a stellar classification of M4 III. It is a semiregular variable with a period of 25 days. Gamma Reticuli has 1.5−2 times the mass of the Sun, 115 times the Sun's radius, and radiates 1,846 times the solar luminosity from its outer atmosphere at an effective temperature of 3,450 K.
Gamma Reticuli is moving through the Galaxy at a speed of 24.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,100 and 39,200 light years from the center of the Galaxy.[http://www.astrostudio.org/xhip.php?hip=18744 Gamma Reticuli (HIP 18744)] {{webarchive|url=https://web.archive.org/web/20140414200554/http://www.astrostudio.org/xhip.php?hip=18744 |date=2014-04-14 }}
References
{{reflist|refs=
| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats
| website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats
| publisher=Strasbourg astronomical Data Center | access-date=30 December 2022}}
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| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}
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| location=Ann Arbor, Michigan
| publisher=Dept. of Astronomy, University of Michigan
| year=1979 | volume=1 | postscript=.
| bibcode=1978mcts.book.....H }}
| title=Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER
| last1=Cruzalèbes | first1=P. | last2=Jorissen | first2=A.
| last3=Rabbia | first3=Y. | last4=Sacuto | first4=S.
| last5=Chiavassa | first5=A. | last6=Pasquato | first6=E.
| last7=Plez | first7=B. | last8=Eriksson | first8=K.
| last9=Spang | first9=A. | last10=Chesneau | first10=O.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=434 | issue=1 | pages=437–450 | date=September 2013
| doi=10.1093/mnras/stt1037 | doi-access=free | bibcode=2013MNRAS.434..437C
| arxiv=1306.3288 | s2cid=49573767 | display-authors=1 | postscript=. }}
| last1=Mermilliod | first1=J.-C.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV Data
| year=1986 | publisher=SIMBAD
| bibcode=1986EgUBV........0M | postscript=. }}
| title=gam Ret
| access-date=2017-02-13 | postscript=. }}
| last1=Eggen | first1=Olin J.
| title=Asymptotic giant branch stars near the sun
| journal=Astronomical Journal | postscript=.
| volume=104 | issue=1 | pages=275–313 | date=July 1992
| doi=10.1086/116239 | bibcode=1992AJ....104..275E }}
}}
{{Stars of Reticulum|state=collapsed}}
{{DEFAULTSORT:Gamma Reticuli}}
Category:Asymptotic-giant-branch stars