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{{Starbox begin
| name = γ Crateris
}}{{Starbox image
| image={{Location mark
|image=Crater constellation map.svg|alt=|float=center|width=240
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=γ Crt
|x=486|y=544
}}
|caption=Location of γ Crateris (circled)
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Crater
| ra = {{RA|11|24|52.92362}}
| dec = {{DEC|−17|41|02.4300}}
| appmag_v = 4.06[3]
}}{{Starbox character
| class = A9 V[4]
| b-v = +0.22[3]
| u-b = +0.09[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|+1.0|4.1}}[7]
| prop_mo_ra = −97.42
| prop_mo_dec = +3.65
| parallax = 38.0906
| p_error = 0.3570
| parallax_footnote = [1]
| absmag_v = +2.05[11]
}}{{Starbox detail
| source =
| component1 = γ Crt A
| mass = 1.81[12]
| radius = 1.3[13]
| luminosity = 18.8[14]
| temperature = {{Val|8020|273|fmt=commas}}[15]
| gravity = {{Val|4.21|0.14}}[15]
| metal_fe = −0.01[17]
| rotational_velocity = 144[18]
| age_myr = 757[15]
| component2 = γ Crt B
| mass2 = 0.75[12]
}}{{Starbox catalog
| names = γ Crt, 15 Crateris, BD−16° 3244, FK5 431, HD 99211, HIP 55705, HR 4405, SAO 156661.[21]
}}{{Starbox reference
| Simbad = gam+Crt
}}{{Starbox end}}Gamma Crateris is a binary star[12] system, divisible with a small amateur telescope,[23] and located at the center of the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.06.[3] With an annual parallax shift of 39.62 mas as seen from Earth, this star is located 82.3 light years from the Sun. Based upon the motion of this system through space, it is a potential member of the Castor Moving Group.[25]The primary, component A, is a white-hued A-type main sequence star of apparent visual magnitude 4.08 with a stellar classification of A9 V.[4] The star has an estimated 1.81[12] times the mass of the Sun and around 1.3[13] times the Sun's radius. It is about 757[15] million years old and is spinning with a projected rotational velocity of 144 km/s.[18] The primary is radiating 18.8[14] times the solar luminosity from its outer atmosphere at an effective temperature of 8,020 K.[15] Based upon the detection of an infrared excess, the star may host an orbiting debris disk.[14] However, this finding remains in doubt.[34] The companion, component B, is a magnitude 9.6 star with an estimated mass 75% that of the Sun. As of 2010, the companion was located at an angular separation of 4.98 arc seconds along a position angle of 93.1° relative to the primary. This is equivalent to a projected separation of 125.6 AU.[12] This star may be the source of the X-ray emission detected coming from this system.[36] References1. ^{{cite DR2|3546521385853638912}}
2. ^1 {{citation | 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 | postscript=. }}
3. ^1 {{citation | title=A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER | display-authors=1 | last1=Ertel | first1=S. | last2=Absil | first2=O. | last3=Defrère | first3=D. | last4=Le Bouquin | first4=J.-B. | last5=Augereau | first5=J.-C. | last6=Marion | first6=L. | last7=Blind | first7=N. | last8=Bonsor | first8=A. | last9=Bryden | first9=G. | last10=Lebreton | first10=J. | last11=Milli | first11=J. | journal=Astronomy & Astrophysics | volume=570 | id=A128 | pages=20 | date=October 2014 | doi=10.1051/0004-6361/201424438 | bibcode=2014A&A...570A.128E | arxiv=1409.6143 | postscript=. }}
4. ^1 {{citation | title=Go-To Telescopes Under Suburban Skies | series=The Patrick Moore Practical Astronomy Series | first1=Neale | last1=Monks | postscript=. | publisher=Springer Science & Business Media | year=2010 | isbn=1441968512 | page=113 | url=https://books.google.com/books?id=waO6tUtfblsC&pg=PA113 }}
5. ^1 {{citation | title=Spectroscopic metallicities of Vega-like stars | last1=Saffe | first1=C. | last2=Gómez | first2=M. | last3=Pintado | first3=O. | last4=González | first4=E. | journal=Astronomy and Astrophysics | postscript=. | volume=490 | issue=1 | pages=297–305 | date=October 2008 | doi=10.1051/0004-6361:200810260 | bibcode=2008A&A...490..297S |arxiv = 0805.3936 }}
6. ^1 2 {{citation | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) | journal=Astronomy and Astrophysics | display-authors=1 | volume=367 | pages=521–524 | date=February 2001 | edition=3rd | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | postscript=. }}
7. ^1 {{citation | title=X-ray emission from A-type stars | last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M. | journal=Astronomy and Astrophysics | postscript=. | volume=475 | issue=2 | date=November 2007 | pages=677–684 | doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S }}
8. ^1 {{citation | display-authors=1 | last1=Nakajima | first1=Tadashi | last2=Morino | first2=Jun-Ichi | last3=Fukagawa | first3=Misato | title=Potential Members of Stellar Kinematical Groups within 20 pc of the Sun | journal=The Astronomical Journal | postscript=. | volume=140 | issue=3 | pages=713–722 | date=September 2010 | doi=10.1088/0004-6256/140/3/713 | bibcode=2010AJ....140..713N }}
9. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
10. ^1 2 3 {{citation | title=Atomic gas in debris discs | last1=Hales | first1=Antonio S. | last2=Barlow | first2=M. J. | last3=Crawford | first3=I. A. | last4=Casassus | first4=S. | journal=Monthly Notices of the Royal Astronomical Society | volume=466 | issue=3 | pages=3582–3593 | date=April 2017 | doi=10.1093/mnras/stw3274 | bibcode=2017MNRAS.466.3582H | arxiv=1612.05465 | display-authors=1 | postscript=. }}
11. ^1 2 3 4 5 {{citation | last1=De Rosa | first1=R. J. | last2=Patience | first2=J. | last3=Wilson | first3=P. A. | last4=Schneider | first4=A. | last5=Wiktorowicz | first5=S. J. | last6=Vigan | first6=A. | last7=Marois | first7=C. | last8=Song | first8=I. | last9=MacIntosh | first9=B. | last10=Graham | first10=J. R. | last11=Doyon | first11=R. | last12=Bessell | first12=M. S. | last13=Thomas | first13=S. | last14=Lai | first14=O. | title=The VAST Survey - III. The multiplicity of A-type stars within 75 pc | journal=Monthly Notices of the Royal Astronomical Society | volume=437 | issue=2 | pages=1216 | year=2013 | display-authors=1 | bibcode=2014MNRAS.437.1216D | doi=10.1093/mnras/stt1932 | arxiv=1311.7141 | postscript=. }}
12. ^1 2 3 4 5 {{citation | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | postscript=. }}
13. ^1 2 {{citation | last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M. | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | year=1978 | publisher=Dept. of Astronomy, University of Michigan | bibcode=1988mcts.book.....H | postscript=. }}
14. ^1 2 {{citation | display-authors=1 | last1=Royer | first1=F. | last2=Zorec | first2=J. | last3=Gómez | first3=A. E. | title=Rotational velocities of A-type stars. III. Velocity distributions | journal=Astronomy and Astrophysics | volume=463 | issue=2 | pages=671–682 | date=February 2007 | doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R | arxiv=astro-ph/0610785 | postscript=. }}
15. ^1 2 3 4 {{citation | 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=. }}
16. ^1 {{cite simbad | title=gam Crt | accessdate=2017-03-02 | postscript=. }}
}}External links
| first1=James B. | last1=Kaler | date=April 15, 2011
| work=Stars | publisher=University of Illinois | title=Gamma Crateris
| url=http://stars.astro.illinois.edu/sow/gammacrt.html
| accessdate=2017-03-03 | postscript=. }}{{Stars of Crater|state=collapsed}} 9 : A-type main-sequence stars|Binary stars|Crater (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |