B3 Hydrae

{{DISPLAYTITLE:b3 Hydrae}} {{for|other stars with this Bayer designation|b Hydrae}} {{Short description|Multiple star system in the constellation Hydra}} {{Starbox begin | name = b3 Hydrae }} {{Starbox observe | epoch = J2000.0 | constell = [[Hydra (constellation)|Hydra]]<ref name=xhipa/> | ra = {{RA|10|53|29.532}}<ref name=dr3a/> | dec = {{DEC|−20|08|19.43}}<ref name=dr3a/> | appmag_v = 5.24<ref name=DATA/> }} {{Starbox character | type = [[main sequence]]<ref name=dr3a/> | class = F5V<ref name=DATA>{{cite web | url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=5050&-corr=PK=HR&-out.max=9999&HR=4251 | title=VizieR Detailed Page | accessdate=2012-07-13 | archive-date=2016-03-04 | archive-url=https://web.archive.org/web/20160304210307/http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=5050&-corr=PK=HR&-out.max=9999&HR=4251 }}</ref> | b-v = +0.47<ref name=DATA /> | u-b = +0.06<ref name=DATA /> | variable = }} {{Starbox astrometry | radial_v = {{Val|-4.08|0.12}}<ref name=dr3a/> | prop_mo_ra = {{Val|+80.915}}<ref name=dr3a/> | prop_mo_dec = {{Val|-238.566}}<ref name=dr3a/> | parallax = 33.2327 | p_error = 0.1234 | parallax_footnote = <ref name=dr3a>{{cite Gaia DR3|3551002857809958400}}</ref> | absmag_v = +2.79<ref name=xhipa>{{cite XHIP|53252}}</ref> }} {{Starbox detail | mass = 1.48<ref name=ag2018>{{cite journal |last1=Aguilera-Gómez |first1=Claudia |last2=Ramírez |first2=Iván |last3=Chanamé |first3=Julio |title=Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert |journal=Astronomy and Astrophysics |date=2018 |volume=614 |pages=A55 |doi=10.1051/0004-6361/201732209 |arxiv=1803.05922 |bibcode=2018A&A...614A..55A }}</ref> | temperature = 6,505<ref name=tic>{{cite journal |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Paegert |first3=Martin |last4=Torres |first4=Guillermo |last5=Pepper |first5=Joshua |last6=De Lee |first6=Nathan |last7=Collins |first7=Kevin |last8=Latham |first8=David W. |last9=Muirhead |first9=Philip S. |last10=Chittidi |first10=Jay |last11=Rojas-Ayala |first11=Bárbara |last12=Fleming |first12=Scott W. |last13=Rose |first13=Mark E. |last14=Tenenbaum |first14=Peter |last15=Ting |first15=Eric B. |last16=Kane |first16=Stephen R. |last17=Barclay |first17=Thomas |last18=Bean |first18=Jacob L. |last19=Brassuer |first19=C. E. |last20=Charbonneau |first20=David |last21=Ge |first21=Jian |last22=Lissauer |first22=Jack J. |last23=Mann |first23=Andrew W. |last24=McLean |first24=Brian |last25=Mullally |first25=Susan |last26=Narita |first26=Norio |last27=Plavchan |first27=Peter |last28=Ricker |first28=George R. |last29=Sasselov |first29=Dimitar |last30=Seager |first30=S. |display-authors=1 |title=The Revised TESS Input Catalog and Candidate Target List |journal=The Astronomical Journal |date=2019 |volume=158 |issue=4 |page=138 |doi=10.3847/1538-3881/ab3467 |doi-access=free |arxiv=1905.10694 |bibcode=2019AJ....158..138S }}</ref> | luminosity = 6.02<ref name=tic/> | radius = 1.93<ref name=tic/> | gravity = 3.99<ref name=tic/> | rotation = 27.1 days<ref name=oelkers2025>{{cite journal |last1=Oelkers |first1=Ryan J. |last2=Rodriguez |first2=Joseph E. |last3=Stassun |first3=Keivan G. |last4=Pepper |first4=Joshua |last5=Somers |first5=Garrett |last6=Kafka |first6=Stella |last7=Stevens |first7=Daniel J. |last8=Beatty |first8=Thomas G. |last9=Siverd |first9=Robert J. |last10=Lund |first10=Michael B. |last11=Kuhn |first11=Rudolf B. |last12=James |first12=David |last13=Gaudi |first13=B. Scott |title=Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey |journal=The Astronomical Journal |date=2018 |volume=155 |issue=1 |page=39 |doi=10.3847/1538-3881/aa9bf4 |doi-access=free |arxiv=1711.03608 |bibcode=2018AJ....155...39O }}</ref> | rotational_velocity = 6.0<ref name=reiners2003>{{cite journal |last1=Reiners |first1=A. |last2=Schmitt |first2=J. H. M. M. |title=Rotation and differential rotation in field F- and G-type stars |journal=Astronomy and Astrophysics |date=2003 |volume=398 |issue=2 |page=647 |doi=10.1051/0004-6361:20021642 |bibcode=2003A&A...398..647R }}</ref> | metal_fe = +0.09<ref name=ag2018/> | age_gyr = 2.27<ref name=ag2018/> }} {{Starbox catalog | names={{odlist | CCDM=J10534-2009A | WDS=J10535-2008A | B=b3 Hya | F=6 Crt | HR=4521 | HD=94388 | HIP=53252 | SAO=156301 | PPM=258261 }}<ref name=SIMBAD>{{cite simbad | title=6 Crateris |access-date=2025-09-14 }}</ref> }} {{Starbox reference | Simbad=HD+94388 }} {{Starbox end}}

'''b3 Hydrae''' ('''6 Crateris''') is a star in the constellation [[Hydra (constellation)|Hydra]] at a distance of approximately 98 [[light-year|light-years]] (about 30 [[parsecs]]) from the [[Sun]]. It has three [[optical double|optical companions]], which are background stars located much farther away.

==Description== b3 Hydrae (WDS J10535-2008A) is a yellow-white [[main sequence]] star with the [[spectral class|spectral type]] of F5V. The [[apparent magnitude]] of the star is +5.232. It has about {{Solar mass|1.5|link=y}}, its radius is about {{Solar radius|1.9|link=y}} and the luminosity is about {{Solar luminosity|6.0|link=y}}. The age of the star is determined to be about 1.647 billion years.<ref name=ag2018/> The [[effective temperature]] is about {{val|fmt=commas|6505|ul=K}}.

==Optical companions== === BD−19 3124 === The secondary (BD−19 3124) is a yellow main sequence star of spectral type G5.<ref name=ma2023/> The apparent magnitude of the star is +9.6.<ref name=tycho2/> The mass is about {{Solar mass|1.492 ± 0.001|link=y}}<ref name=dr3b/>, the radius is about {{Solar radius|2.071 ± 0.008|link=y}}<ref name=dr3b/>, the luminosity is about {{Solar luminosity|6.946 ± 0.001|link=y}}<ref name=dr3b/>. The effective temperature is about {{val|fmt=commas|6566|1|u=K}}<ref name=dr3b/>. It is 119.6 [[arcsecond]]s away from b3 Hydrae<ref name=wds>{{cite journal |last1=Mason |first1=Brian D. |last2=Wycoff |first2=Gary L. |last3=Hartkopf |first3=William I. |last4=Douglass |first4=Geoffrey G. |last5=Worley |first5=Charles E. |title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog |journal=The Astronomical Journal |date=2001 |volume=122 |issue=6 |page=3466 |doi=10.1086/323920 |bibcode=2001AJ....122.3466M }}</ref> and about {{convert|774|ly|pc|lk=on|abbr=off}} away from the Solar System.<ref name=dr3b/>

=== UCAC2 23866861 === The third component (UCAC2 23866861) is a [[G-type main-sequence stars|yellow dwarf]] of spectral type G.{{cn|date=September 2025}} The apparent magnitude of the star is +11.6.<ref name=UCAC4-RPM/> The mass is about {{Solar mass|0.989 ± 0.001|link=y}}<ref name=dr3c/>, the radius is about {{Solar radius|1.315 ± 0.002|link=y}}<ref name=dr3c/>, the luminosity is about {{Solar luminosity|1.662 ± 0.001|link=y}}<ref name=dr3c/>. The effective temperature is about {{val|fmt=commas|5761|4|u=K}}<ref name=dr3c/>. It is separated from BD−19 3124 by 13.7 arc seconds<ref name=wds/> and is about {{convert|850|ly|pc|lk=on|abbr=off}} away from the Solar System.<ref name=dr3c/>

=== UCAC2 23866855 === The fourth component (UCAC2 23866855) is a yellow-white star of spectral type F.{{cn|date=September 2025}} The apparent magnitude of the star is +13.5.<ref name=ucac4/> The mass is about {{Solar mass|1.332 ± 0.001|link=y}}<ref name=dr3d/> the radius is about {{Solar radius|1.829 ± 0.005|link=y}}<ref name=dr3d/> the luminosity is about {{Solar luminosity|4.356 ± 0.001|link=y}}<ref name=dr3d/> the effective temperature is about {{val|fmt=commas|6236|1|u=K}}<ref name=dr3d/>. It is located 40.5 arc seconds away from BD−19 3124<ref name=wds/> and is about {{convert|3820|ly|pc|lk=on|abbr=off}} away from the Solar System.<ref name=dr3d/>

==References== <references>

<ref name=tycho2>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=2000 |volume=355 |bibcode=2000A&A...355L..27H }}</ref>

<ref name=UCAC4-RPM>{{cite journal |last1=Nascimbeni |first1=V. |last2=Piotto |first2=G. |last3=Ortolani |first3=S. |last4=Giuffrida |first4=G. |last5=Marrese |first5=P. M. |last6=Magrin |first6=D. |last7=Ragazzoni |first7=R. |last8=Pagano |first8=I. |last9=Rauer |first9=H. |last10=Cabrera |first10=J. |last11=Pollacco |first11=D. |last12=Heras |first12=A. M. |last13=Deleuil |first13=M. |last14=Gizon |first14=L. |last15=Granata |first15=V. |title=An all-sky catalogue of solar-type dwarfs for exoplanetary transit surveys |journal=Monthly Notices of the Royal Astronomical Society |date=2016 |volume=463 |issue=4 |page=4210 |doi=10.1093/mnras/stw2313 |doi-access=free |arxiv=1609.03037 |bibcode=2016MNRAS.463.4210N }}</ref>

<ref name=ucac4>{{cite journal |last1=Zacharias |first1=N. |last2=Finch |first2=C. T. |last3=Girard |first3=T. M. |last4=Henden |first4=A. |last5=Bartlett |first5=J. L. |last6=Monet |first6=D. G. |last7=Zacharias |first7=M. I. |title=VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012) |journal=Vizier Online Data Catalog |date=2012 |bibcode=2012yCat.1322....0Z }}</ref>

<ref name=ma2023>{{cite journal |last1=Maíz Apellániz |first1=J. |last2=Holgado |first2=G. |last3=Pantaleoni González |first3=M. |last4=Caballero |first4=J. A. |title=Stellar variability in Gaia DR3. I. Three-band photometric dispersions for 145 million sources |journal=Astronomy and Astrophysics |date=2023 |volume=677 |pages=A137 |doi=10.1051/0004-6361/202346759 |arxiv=2304.14249 |bibcode=2023A&A...677A.137M }}</ref>

</references> {{Hydra (constellation)}}

[[Category:Hydra (constellation)]] [[Category:Bayer objects|Hydrae, b3]] [[Category:Flamsteed objects|Crateris, 06]] [[Category:F-type main-sequence stars]] [[Category:G-type main-sequence stars]] [[Category:Henry Draper Catalogue objects|094388]] [[Category:Bright Star Catalogue objects|4521]] [[Category:Hipparcos objects|053252]]