Psi Ophiuchi

{{Starbox image

| image =

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=Psi Ophiuchi

|x=763|y=800

}}

| caption = Location of ψ Ophiuchi (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Ophiuchus

| ra = {{RA|16|24|06.18464}}

| dec = {{DEC|−20|02|14.3784}}

| appmag_v = 4.50

}}

{{Starbox character

| type = horizontal branch

| class = K0- II-III

| b-v = +1.03

| u-b = +0.84

| variable =

}}

{{Starbox astrometry

| radial_v = +0.60

| prop_mo_ra = −20.29

| prop_mo_dec = −47.65

| parallax = 16.35

| p_error = 0.25

| parallax_footnote =

| absmag_v = 0.806

}}

{{Starbox detail

| source =

| mass = 1.61

| radius = 11.45

| temperature = 4,864

| luminosity = 65.9

| rotational_velocity = < 1.0

| gravity = 2.56

| metal_fe = −0.20

}}

{{Starbox catalog

| names = {{odlist | B=ψ Oph | F=4 Ophiuchi | BD=−19°4365 | FK5=1373 | HD=147700 | HIP=80343 | HR=6104 | SAO=159892 | GC=22042 }}

}}

{{Starbox reference

| Simbad = Psi+Ophiuchi

}}

Psi Ophiuchi, which is Latinized from ψ Ophiuchi, is a single star in the equatorial constellation of Ophiuchus, next to the western constellation border with Scorpius. It has an orange hue and is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.50. It is approximately 199 light-years from Earth, based on parallax.

It is an aging giant or bright giant star with a stellar classification of K0- II-III, indicating it has exhausted the supply of hydrogen at its core, then cooled and expanded. It presently has 11 times the girth of the Sun and 1.6 times the Sun's mass. It is a red clump giant, meaning it is on the horizontal branch and is generating energy through core helium fusion. It is radiating 66 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,864 K.

References

{{reflist|refs=

{{cite journal

| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.

| title=The Perkins catalog of revised MK types for the cooler stars

| journal=Astrophysical Journal Supplement Series

| volume=71 | pages=245 | year=1989

| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}

{{cite journal

| 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

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 }}

{{cite journal

| display-authors=1 | last1=Liu | first1=Y. J.

| last2=Zhao | first2=G. | last3=Shi | first3=J. R.

| last4=Pietrzynski | first4=G. | last5=Gieren | first5=W.

| title=The abundances of nearby red clump giants

| journal=Monthly Notices of the Royal Astronomical Society

| volume=382 | issue=2 | pages=553 | year=2007

| doi=10.1111/j.1365-2966.2007.11852.x

| bibcode=2007MNRAS.382..553L | doi-access=free }}

{{cite journal

| title=Validation of the new Hipparcos reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | year=2007

| last1=Van Leeuwen | first1=F.

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357

| s2cid=18759600

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2080343 Vizier catalog entry]

{{cite journal

| last=Ducati | first=J. R.

| title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system

| journal=CDS/ADC Collection of Electronic Catalogues

| volume=2237 | year=2002 | bibcode=2002yCat.2237....0D }}

{{Cite journal

| last1=Gontcharov| first1=G. A.

| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system

| journal=Astronomy Letters

| volume=32 | issue=11 | pages=759–771 | year=2006

| bibcode=2006AstL...32..759G | arxiv=1606.08053

| doi=10.1134/S1063773706110065 | s2cid=119231169

}}

{{cite journal

| display-authors=1 | last1=Reffert | first1=Sabine

| last2=Bergmann | first2=Christoph | last3=Quirrenbach | first3=Andreas

| last4=Trifonov | first4=Trifon | last5=Künstler | first5=Andreas

| title=Precise radial velocities of giant stars

| journal=Astronomy & Astrophysics

| volume=574 | pages=A116 | year=2015

| arxiv=1412.4634 | bibcode=2015A&A...574A.116R

| doi=10.1051/0004-6361/201322360 | hdl=10722/215277

| s2cid=59334290 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/574/A116&HIP=80343 Vizier catalog entry]

{{cite journal

| last1=De Medeiros | first1=J. R. | last2=Alves | first2=S.

| last3=Udry | first3=S. | last4=Andersen | first4=J.

| last5=Nordström | first5=B. | last6=Mayor | first6=M.

| title=A catalog of rotational and radial velocities for evolved stars

| journal=Astronomy & Astrophysics

| volume=561 | pages=A126 | year=2014

| bibcode=2014A&A...561A.126D | arxiv=1312.3474

| doi=10.1051/0004-6361/201220762

| s2cid=54046583 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/561/A126/table1&HD=147700 Vizier catalog entry]

}}

Category:K-type bright giants

Category:K-type giants

Category:Horizontal-branch stars