21 Lyncis

{{Starbox image

| image = 250px

| caption = 21 Lyncis (center) in optical light

}}

{{Starbox observe

| epoch = J2000

| constell = Lynx

| ra = {{RA|07|26|42.85187}}

| dec = {{DEC|+49|12|41.4907}}

| appmag_v = 4.61

}}

{{Starbox character

| type = main sequence

| class = A0.5Vs

| b-v = {{Val|−0.001|0.002}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+26.8|0.1}}

| prop_mo_ra = −10.22

| prop_mo_dec = −49.29

| parallax = 11.92

| p_error = 0.24

| parallax_footnote =

| absmag_v = −0.01

}}

{{Starbox detail

| source =

| mass = 2.22

| radius =

| luminosity = 102.01

| temperature = {{Val|9692|330|fmt=commas}}

| metal_fe =

| gravity =

| rotational_velocity = 18

| age_myr = 272

}}

{{Starbox catalog

| names = {{odlist | F=21 Lyn | BD=+49° 1623 | FK5=2572 | HD=58142 | HIP=36145 | HR=2818 | SAO=41764 }}

}}

{{Starbox reference

| Simbad = 21+Lyn

}}

21 Lyncis is a single star in the northern constellation of Lynx. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.61. The star is located at a distance of about 274 light years away from the Sun, based on parallax. It is moving further away from the Earth with a heliocentric radial velocity of around +27 km/s.

This object is an ordinary A-type main-sequence star with a stellar classification of A0.5Vs, where the 's' suffix indicates "sharp" lines in the spectrum, usually due to slow rotation. It is about 272 million years old with a projected rotational velocity of 18 km/s. The star has 2.22 times the mass of the Sun and is radiating 102 times the luminosity of the Sun from its photosphere at an effective temperature of 9,692 K.

References

{{reflist|refs=

{{citation

| 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=. }}

{{citation

| last1=Abt | first1=Helmut A. | last2=Morrell | first2=Nidia I.

| title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars

| journal=Astrophysical Journal Supplement

| volume=99 | pages=135 | year=1995

| doi=10.1086/192182 | bibcode=1995ApJS...99..135A | doi-access=free }}

{{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 | s2cid=119257644 | postscript=. }}

{{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 | s2cid=33401607 | postscript=. }}

{{citation

| 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

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E

| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

}}

Category:A-type main-sequence stars

Category:Lynx (constellation)

Category:Durchmusterung objects