Pi Coronae Borealis

{{Starbox begin

| name = π Coronae Borealis

}}

{{Starbox image

| image =

{{Location mark

|image=Corona Borealis constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=π CrB

|x=532|y=414

}}

|caption=Location of π Coronae Borealis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Corona Borealis

| ra = {{RA|15|43|59.29973}}

| dec = {{DEC|+32|30|56.9047}}

| appmag_v = 5.578

}}

{{Starbox character

| type = red clump

| class = G9 III:

| b-v = 1.074

| u-b =

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−4.94|0.51}}

| prop_mo_ra = −29.92

| prop_mo_dec = −8.85

| parallax = 13.40

| p_error = 0.21

| parallax_footnote =

| absmag_v = +1.21

}}

{{Starbox detail

| source =

| mass = 1.61

| radius = 10

| luminosity = 39

| temperature = {{Val|4667|5|fmt=commas}}

| gravity = 2.7

| metal_fe = −0.15

| rotational_velocity = 3.5

| age_gyr = 4.6

}}

{{Starbox catalog

| names = {{odlist | B=π CrB | F=9 CrB | BD=+32°2621 | HD=140716 | HIP=77048 | HR=5855 | SAO=64870 }}

}}

{{Starbox reference

| Simbad = pi+CrB

}}

Pi Coronae Borealis, Latinized from π Coronae Borealis, is a solitary, orange-hued star in the northern constellation of Corona Borealis. Its apparent magnitude is 5.58, which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 13.40 mas as measured from Earth, it is located about 243 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −5 km/s. It is most likely (98% chance) a member of the thin disk population.

This is an evolved G-type giant star with a stellar classification of G9 III:, where the ':' indicates some uncertainty about the classification. (Bartkevicius and Lazauskaite (1997) classify it as K0 III.) The star has 1.61 times the mass of the Sun and has expanded to about 10 times the Sun's radius. The abundance of iron is lower than in the Sun: the star is considered metal deficient. It is a red clump giant, fusing helium in its core. It is around 4.6 billion years old and is radiating 39 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,667 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 | display-authors=1

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| last3=Mishenina | first3=T. V. | last4=Kovtyukh | first4=V. V.

| title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants

| journal=Astronomy and Astrophysics

| date=2008 | volume=480 | issue=1 | pages=91–101

| bibcode=2008A&A...480...91S | doi=10.1051/0004-6361:20078788

| arxiv=0712.1370 | s2cid=16602121 | postscript=. }}

{{citation

| title=Classification of Population II Stars in the Vilnius Photometric System. II. Results

| last1=Bartkevicius | first1=A. | last2=Lazauskaite | first2=R.

| journal=Baltic Astronomy | volume=6 | pages=499–572 | date=December 1997

| issue=4 | bibcode=1997BaltA...6..499B | postscript=. | doi=10.1515/astro-1997-0402| 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=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

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

{{citation

| title=Abundances in the Local Region. I. G and K Giants

| journal=The Astronomical Journal

| last1=Luck | first1=R. Earle | postscript=.

| volume=150 | issue=3 | pages=88 | year=2015

| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 |arxiv = 1507.01466 | s2cid=118505114

}}

{{citation | display-authors=1

| last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W.

| last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey

| title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity

| journal=The Astronomical Journal | postscript=.

| volume=135 | issue=1 | pages=209–231 | date=January 2008

| doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | doi-access=free }}

{{cite simbad

| title=pi. CrB

| accessdate=2017-04-30 | postscript=. }}

}}

Category:G-type giants

Category:Corona Borealis

Coronae Borealis, Pi

Category:Durchmusterung objects