F Hydrae

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

{{Starbox begin

|name= F Hydrae

}}

{{Starbox image

| image=

{{Location mark

|image=Hydra constellation map.svg

|float=center

|alt=

|label=

|position=right

|width=340

|mark=Red circle.svg

|mark_width=8

|mark_link=F Hydrae

|x=898|y=220

}}

|caption=Location of F Hya (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|08|43|40.37345}}{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|last1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 |s2cid=18759600}}

| dec = {{DEC|-07|15|01.4323}}

| appmag_v = 4.64{{cite journal|bibcode=2014AJ....147..137L|title=Parameters and Abundances in Luminous Stars|journal=The Astronomical Journal|volume=147|issue=6|pages=137|last1=Luck|first1=R. Earle|year=2014|doi=10.1088/0004-6256/147/6/137|doi-access=free}}

| constell= Hydra

}}

{{Starbox character

| class = G1Ib{{cite journal|bibcode=2015MNRAS.446.3447L|arxiv=1411.2722|title=Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants|journal=Monthly Notices of the Royal Astronomical Society|volume=446|issue=4|pages=3447|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Korotin|first3=Sergey A.|last4=Rachkovskaya|first4=Tamara M.|last5=Poklad|first5=Dmitry B.|year=2015|doi=10.1093/mnras/stu2299|doi-access=free }}

| b-v = +0.80

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = 28.50{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}

| prop_mo_ra = −11.62

| prop_mo_dec = −1.36

| parallax = 4.24

| p_error = 0.17

| parallax_footnote =

| absmag_v = −2.77{{cite journal|bibcode=2010MNRAS.408.1568K|title=Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios|journal=Monthly Notices of the Royal Astronomical Society|volume=408|issue=3|pages=1568|last1=Kovtyukh|first1=V. V.|last2=Chekhonadskikh|first2=F. A.|last3=Luck|first3=R. E.|last4=Soubiran|first4=C.|last5=Yasinskaya|first5=M. P.|last6=Belik|first6=S. I.|year=2010|doi=10.1111/j.1365-2966.2010.17217.x|doi-access=free}}

}}

{{Starbox detail

| mass = 5.2

| radius = 110{{cite journal|bibcode= 2001A&A...367..521P|title= Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics|journal= Astronomy and Astrophysics|volume= 367|issue= 2|pages= 521|last1= Pasinetti Fracassini|first1= L. E.|last2= Pastori|first2= L.|last3= Covino|first3= S.|last4= Pozzi|first4= A.|year= 2001|doi= 10.1051/0004-6361:20000451|arxiv = astro-ph/0012289 |s2cid= 425754}}

| luminosity =

| temperature = 5,370

| gravity = 2.08

| metal_fe = −0.01{{cite journal|bibcode=2012MNRAS.423.3268K|arxiv=1204.4115|title=Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants|journal=Monthly Notices of the Royal Astronomical Society|volume=423|issue=4|pages=3268|last1=Kovtyukh|first1=V. V.|last2=Gorlova|first2=N. I.|last3=Belik|first3=S. I.|year=2012|doi=10.1111/j.1365-2966.2012.21117.x|doi-access=free |s2cid=118683158}}

| rotational_velocity = 10.5{{cite journal|bibcode=2012MNRAS.427...11L|title=Lithium abundance in atmospheres of F- and G-type supergiants and bright giants|journal=Monthly Notices of the Royal Astronomical Society|volume=427|pages=11–26|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Kaminsky|first3=Bogdan M.|last4=Pavlenko|first4=Yakov V.|last5=Poklad|first5=Dmitry B.|last6=Rachkovskaya|first6=Tamara M.|year=2012|issue=1 |doi=10.1111/j.1365-2966.2012.21617.x|doi-access=free |arxiv = 1212.6057 |s2cid=119191810}}

| age_myr = 89{{cite journal|bibcode=2010MNRAS.402.1369L|arxiv=0911.1335|title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood|journal=Monthly Notices of the Royal Astronomical Society|volume=402|issue=2|pages=1369|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Rostopchin|first3=Sergey I.|last4=Rachkovskaya|first4=Tamara M.|last5=Poklad|first5=Dmitry B.|year=2010|doi=10.1111/j.1365-2966.2009.15979.x|doi-access=free |s2cid=119096173}}

}}

{{Starbox catalog

| names = F Hya, 31 Mon,{{cite journal|bibcode=1903AnHar..48..125P|title=A catalogue of 1520 bright stars|journal=Annals of Harvard College Observatory |volume=48|pages=125|last1=Pickering|first1=Edward Charles|year=1903|issue=4 }} HR 3459, HD 74395, BD−06°2708, SAO 136221, HIP 42835, WDS J08437-0714

}}

{{Starbox reference

| Simbad=F+Hydrae

}}

{{Starbox end}}

F Hydrae, also known as HD 74395, is a star in the constellation Hydra with an apparent magnitude is 4.64. It was catalogued as 31 Monocerotis, but this name is now rarely used since the star is now within the boundaries of Hydra. It is a low mass yellow supergiant around a thousand times brighter than the sun and five times as massive.

F Hya is a catalogued as a triple star, with 8th magnitude BD-06°2707 80" away and 13th magnitude companion at 57".{{cite journal|bibcode= 2001AJ....122.3466M|title= The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog|journal= The Astronomical Journal|volume= 122|issue= 6|pages= 3466|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.|year= 2001|doi= 10.1086/323920|doi-access= free}}