Lambda Gruis
{{short description|Star in the constellation Grus}}
{{Starbox begin
| name = Lambda Gruis
}}
{{Starbox observe
| epoch = J2000.0
| constell = Grus
| dec = {{DEC|−39|32|36.0659}}
}}
{{Starbox character
| type = giant
| r-i =
| variable =
}}
{{Starbox astrometry
| parallax = 13.47
| p_error = 0.22
}}
{{Starbox detail
| mass = 2.4
| radius = 22.3
| luminosity = 155
| temperature = 4,269
| gravity = 2.13
| metal_fe =
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | B=λ Gru | CD=−40°14639 | FK5=1581 | HD=209688 | HIP=109111 | HR=8411 | SAO=213543 }}
}}
{{Starbox reference
| Simbad = lam+Gru
}}
{{starbox end}}
Lambda Gruis, Latinized from λ Gruis, is a solitary, orange-hued star in the southern constellation of Grus. With an apparent visual magnitude of 4.47, it is visible to the naked eye as a faint point of light. The distance to this star, as determined using an annual parallax shift of 13.47 mas as seen from the Earth, is around 242 light years. It is drifting further away with a radial velocity of +39 km/s, having come to within {{Convert|56.0|pc|ly|disp=out|abbr=off}} some 805,000 years ago.
This is an evolved K-type giant star with a stellar classification of K3 III, having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. It has about 2.4 times the mass of the Sun and has expanded to 22.3 times the Sun's radius. The star is radiating 155 times the Sun's luminosity from its photosphere at an effective temperature of 4,269 K.
References
{{reflist|refs=
| 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=. }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
| last1=Gontcharov | first1=G. A.
| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
| journal=Astronomy Letters | postscript=.
| volume=32| issue=11| pages=759–771| date=November 2006
| doi = 10.1134/S1063773706110065| bibcode=2006AstL...32..759G |arxiv = 1606.08053 | s2cid=119231169
}}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| bibcode=2008MNRAS.389..869E | doi=10.1111/j.1365-2966.2008.13596.x
| doi-access=free | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| title=Angular diameter estimation of interferometric calibrators. Example of λ Gruis, calibrator for VLTI-AMBER
| last1=Cruzalèbes | first1=P. | last2=Jorissen | first2=A.
| last3=Sacuto | first3=S. | last4=Bonneau | first4=D.
| journal=Astronomy and Astrophysics | display-authors=1
| volume=515 | id=A6 | pages=15 | date=June 2010
| doi=10.1051/0004-6361/200913686 | bibcode=2010A&A...515A...6C
| arxiv=1003.4399 | s2cid=118484809 | postscript=. }}
| last1=Houk | first1=N.
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=2 | date=1978 | postscript=.
| publisher=Dept. of Astronomy, University of Michigan
| bibcode=1978mcts.book.....H }}
| last1=Jennens | first1=P. A. | last2=Helfer | first2=H. L.
| title=A new photometric metal abundance and luminosity calibration for field G and K giants
| journal=Monthly Notices of the Royal Astronomical Society
| volume=172 | pages=667–679 | date=September 1975 | issue=3 | postscript=.
| bibcode=1975MNRAS.172..667J | doi=10.1093/mnras/172.3.667| doi-access=free }}
| title=lam Gru
| accessdate=2017-06-26 | postscript=. }}
}}
{{Stars of Grus|state=collapsed}}
{{DEFAULTSORT:Lambda Gruis}}