Theta Leporis

{{Starbox begin

| name = Theta Leporis

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Lepus

| ra = {{RA|06|06|09.32339}}

| dec = {{DEC|−14|56|06.9188}}

| appmag_v = 4.67

}}

{{Starbox character

| class = A0 V

| b-v = +0.05

| u-b = +0.00

| variable =

}}

{{Starbox astrometry

| radial_v = +32.0

| prop_mo_ra = -17.61

| prop_mo_dec = +12.79

| parallax = 18.88

| p_error = 0.54

| parallax_footnote =

| absmag_v = +1.05

}}

{{Starbox detail

| source =

| mass = {{Val|2.35|0.03}}

| radius =

| luminosity = 41

| temperature = {{Val|10453|355|fmt=commas}}

| gravity = 4.12

| metal_fe =

| rotational_velocity = 246

| age_myr = 207

}}

{{Starbox catalog

| names = {{odlist | B=θ Lep | F=18 Lep | BD=−14°1331 | FK5=2466 | HD=41695 | HIP=28910 | HR=2155 | SAO=151110 | GC=7742 }}

}}

{{Starbox reference

| Simbad = tet+Lep

}}

Theta Leporis, Latinized from θ Leporis, is a solitary, white-hued star in the southern constellation of Lepus. It has an apparent visual magnitude of 4.67, making it bright enough to be viewed with the naked eye. Based upon an annual parallax shift of 18.88 mas as measured from Earth, the system is located roughly 173 light years from the Sun. The star made its closest approach about 1.6 million years ago when it came within {{Convert|9.0|pc|ly|order=flip|abbr=on}} of the Sun.

This is an ordinary A-type main-sequence star with a stellar classification of A0 V and an age of about 207 million years. It is rotating rapidly with a projected rotational velocity of 207 km/s. This is giving the star an oblate shape with an equatorial bulge that is an estimated 10% larger than the polar radius. It has an estimated 2.35 times the mass of the Sun and is radiating 41 times the Sun's luminosity from its photosphere at an effective temperature of around 10,453 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

| 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

| title=Interferometric observations of rapidly rotating stars

| last1=Belle | first1=G. T.

| journal=The Astronomy and Astrophysics Review

| volume=20 | pages=51 | year=2012

| issue=1 | doi=10.1007/s00159-012-0051-2 | bibcode=2012A&ARv..20...51V

| arxiv=1204.2572 | s2cid=119273474 | postscript=. }}

{{citation

| last1=Bailer-Jones | first1=C. A. L.

| title=Close encounters of the stellar kind

| journal=Astronomy & Astrophysics

| volume=575 | id=A35 | pages=13 | date=March 2015

| doi=10.1051/0004-6361/201425221 | bibcode=2015A&A...575A..35B

| postscript=. |arxiv = 1412.3648 | s2cid=59039482

}}

{{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=. }}

{{citation

| last1=Zorec | first1=J. | last2=Royer | first2=F.

| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities

| journal=Astronomy & Astrophysics

| volume=537 | page=A120 | date=January 2012

| doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z

| arxiv=1201.2052 | s2cid=55586789 | postscript=. }}

{{citation

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| 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 | display-authors=1

| last1=Johnson | first1=H. L. | last2=Iriarte | first2=B.

| last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z.

| title=UBVRIJKL photometry of the bright stars

| journal=Communications of the Lunar and Planetary Laboratory

| volume=4 | issue=99 | year=1966

| page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}