93 Leonis

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

{{Starbox begin|name=93 Leonis}}

{{Starbox image

| image = 250px

| caption = A visual band light curve for DQ Leonis. The main plot shows the brightness variation over several years, and the inset plot shows the periodic variation seen during 1985. Adapted from Strassmeier et al. (1989)

}}

{{Starbox observe

|epoch=J2000

|constell=Leo

|ra={{RA|11|47|59.13595}}{{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|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}}

|dec={{DEC|+20|13|08.1500}}

|appmag_v=4.522{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}

}}

{{Starbox character

|class=G5III + A7V{{cite journal|display-authors=1|last1=Hummel|first1=C. A.|last2=Armstrong|first2=J. T.|last3=Buscher|first3=D. F.|last4=Mozurkewich|first4=D.|last5=Quirrenbach|first5=A.|last6=Vivekanand|first6=M.|title=Orbits of Small Angular Scale Binaries Resolved with the Mark III Interferometer|journal=Astronomical Journal|volume=110|page=376|date=July 1995|doi=10.1086/117528|bibcode=1995AJ....110..376H|doi-access=free}}

|b-v=+0.9 / +0.2

|u-b=+0.28{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}

|variable=RS CVn

}}

{{Starbox astrometry

|radial_v=0.750 ± 0.05{{cite journal|bibcode=2012MNRAS.422...14H|doi=10.1111/j.1365-2966.2012.20308.x|title=Double stars with wide separations in the AGK3 - I. Components that are themselves spectroscopic binaries|journal=Monthly Notices of the Royal Astronomical Society|volume=422|issue=1|pages=14–24|year=2012|last1=Halbwachs|first1=J.-L.|last2=Mayor|first2=M.|last3=Udry|first3=S.|doi-access=free|url=http://doc.rero.ch/record/293685/files/mnras0422-0014.pdf}}

|prop_mo_ra=−145.49

|prop_mo_dec=−4.34

|parallax=14.02

|p_error=0.23

|parallax_footnote=

|absmag_v=+0.23{{cite XHIP|57565}}

}}

{{Starbox orbit

|reference=

|period_unitless=71.69 d

|axis_unitless={{val|7.5|0.1|ul=mas}}

|inclination={{val|50.1|0.5}}

|node={{val|138|1}}

|periastron=JD 2447642.6 ± 0.2

|eccentricity=0

|periarg=0

|k1={{val|29.67|0.29}}

|k2={{val|33.8|2.1}}

}}

{{Starbox detail

|source=

|component1=93 Leo Aa

|mass={{val|2.25|0.29}}

|radius={{val|9.1|0.5}}

|temperature={{val|5100|100|fmt=commas}}

|luminosity={{val|49.4|3.4}}

|component2=93 Leo Ab

|mass2={{val|1.97|0.15}}

|radius2={{val|2.7|0.2}}

|temperature2={{val|7800|200|fmt=commas}}

|luminosity2={{val|23.9|1.9}}

}}

{{Starbox catalog

|names={{odlist|V=DQ Leo|BD=+21°2358|FK5=1304|HD=102509|HIP=57565|HR=4527|SAO=81998}}

}}

{{Starbox reference

|Simbad=93+Leo

}}

{{Starbox end}}

93 Leonis (93 Leo) is a binary star in the constellation Leo. Its apparent magnitude is 4.522. Based on the system's parallax, 93 Leonis is located about 233 light-years (71 parsecs) away.

93 Leonis is a double-lined spectroscopic binary. Two components are known to exist, because their spectral lines shift periodically, due to the Doppler effect. The two stars are a G-type red giant and an A-type main-sequence star. They complete an orbit once every 71.69 days. The system is also known to be an RS Canum Venaticorum variable, due to its binarity.{{cite simbad|title=* 93 Leo|access-date=15 July 2017}} For that reason, it has been given the variable star designation DQ Leonis.

In Chinese astronomy, 93 Leonis is called 太子, Pinyin: Tàizǐ, meaning Crown Prince, because this star is marking itself and stand alone in Crown Prince asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[http://www.ianridpath.com/startales/leo.htm Ian Ridpath's Startales - Leo the Lion]