R Leonis

{{Short description|Variable star in the constellation Leo}}

{{Starbox begin

| name = R Leonis

}}

{{Starbox image

| image=

{{Location mark

|image=Leo constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=R Leo

|x=908|y=612

}}

|caption=Location of R Leonis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Leo

| ra={{RA|09|47|33.4840}}

| dec={{DEC|+11|25|43.823}}

| appmag_v = 4.4 - 11.3{{cite web

|title=GCVS Query=R Leo

|publisher=General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia

|url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=R+Leo

|accessdate=2012-08-22}}

}}

{{Starbox character

| class = M6e-M8IIIe-M9.5e

| appmag_1_passband = J

| appmag_1 = −0.7{{cite simbad |title=V* R Leo |access-date=2012-08-21}}

| r-i =

| v-r =

| b-v = 1.26

| u-b =

| variable = Mira variable

}}

{{Starbox astrometry

| prop_mo_ra = 6.132

| prop_mo_dec = −53.097

| parallax = 14.0566

| p_error = 0.8378

| parallax_footnote = {{cite Gaia DR2|612958873284128128}}

| dist_ly = 372

| dist_pc = 114{{cite journal|bibcode=2018MNRAS.481.4984M|title=Pulsation-triggered dust production by asymptotic giant branch stars|journal=Monthly Notices of the Royal Astronomical Society|volume=481|issue=4|pages=4984|last1=McDonald|first1=I.|last2=De Beck|first2=E.|last3=Zijlstra|first3=A. A.|last4=Lagadec|first4=E.|year=2018|arxiv=1809.07965|doi=10.1093/mnras/sty2607|doi-access=free |s2cid=118969263}}

}}

{{Starbox detail

| mass = 0.7

| radius = 320{{snd}}350{{Cite journal | arxiv=astro-ph/0411133 | author=Fedele | display-authors=etal | title=The K -Band Intensity Profile of R Leonis Probed by VLTI/VINCI | journal=Astronomy and Astrophysics | volume=431 | issue=3 | pages=1019–1026 | date=2005 | bibcode=2005A&A...431.1019F|doi = 10.1051/0004-6361:20042013 | s2cid=15500217 }}

| luminosity = 3,537

| temperature = 2,930{{snd}}3,080

}}

{{Starbox catalog

| names = {{odlist | V=R Leo | AAVSO=0942+11 | HIP=48036 | HD=84748 | HR=3882 | BD=+12°2096 | SAO=98769 }}

}}

{{Starbox reference

|Simbad=R+Leo

}}

{{Starbox end}}

R Leonis is a red giant Mira-type variable star located approximately 370 light years away in the constellation Leo.

File:RLeoLightCurve.png of R Leonis from AAVSO V band data]]

The apparent magnitude of R Leonis varies between 4.31 and 11.65 with a period of 312 days. At maximum it can be seen with the naked eye, while at minimum a telescope of at least 7 cm is needed. The star's effective temperature is estimated to be 2,930{{snd}}3,080{{nbsp}}kelvins and radius spans {{convert|320|solar radius|km au|abbr=off|lk=on}}, roughly Mars's orbital zone.