68 Aquarii

{{short description|Single, G-type star in the constellation Aquarius}}

{{about|g² Aquarii|other stars with this Bayer designation|g Aquarii}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Aquarius

| ra = {{RA|22|47|33.12362}}

| dec = {{DEC|−19|36|48.1619}}

| appmag_v = 5.24

}}

{{Starbox character

| type = red clump

| class = G8III

| b-v = {{Val|+0.941|0.002}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+24.54|0.27}}

| prop_mo_ra = −103.390

| prop_mo_dec = −205.545

| parallax = 12.0902

| p_error = 0.1605

| parallax_footnote =

| absmag_v = 0.78

}}

{{Starbox detail

| source =

| mass = 1.39

| radius = {{Val|10.05|0.35|1.62}}

| luminosity = {{Val|58.5|0.9}}

| temperature = {{Val|5036|461|85|fmt=commas}}

| gravity = 2.8

| metal_fe = {{Val|−0.43|0.02}}

| rotational_velocity = 0.0

| age_gyr = 3.79

}}

{{Starbox catalog

| names={{odlist | F=68 Aqr | BD=−20°6486 | FK5= | HD=215721 | HIP=112529 | HR=8670 | SAO=165293 | LTT=9194 }}

}}

{{Starbox reference

| Simbad=68+Aqr

}}

68 Aquarii is a single star located 270 light years away from the Sun in the zodiac constellation of Aquarius. 68 Aquarii is its Flamsteed designation, though it also bears the Bayer designation of g² Aquarii. It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.24. The object is moving further from the Earth with a heliocentric radial velocity of +24.5 km/s.

This star is 3.79 billion years old with a stellar classification of G8 III, indicating the star is a giant star that has exhausted the hydrogen at its core and expanded off the main sequence. It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core. It has 1.39 times the mass of the Sun and 10 times the Sun's radius. The star is radiating 59 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,036 K.

References

{{reflist|refs=

{{citation

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| year=1978 | bibcode=1988mcts.book.....H }}

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| bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}

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| bibcode=2012AstL...38..331A | arxiv=1108.4971

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

| display-authors=1 | journal=The Astronomical Journal

| 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 }}

{{citation

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

| journal=The Astronomical Journal

| last1=Luck | first1=R. Earle

| 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

| postscript=. }}

{{citation

| last1=Alves | first1=David R.

| title=K-Band Calibration of the Red Clump Luminosity

| journal=The Astrophysical Journal

| volume=539 | issue=2 | pages=732–741 | date=August 2000

| doi=10.1086/309278 | bibcode=2000ApJ...539..732A

| arxiv=astro-ph/0003329 | s2cid=16673121

}}

{{citation

| url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=IV/27A/catalog&recno=3858

| access-date=2019-05-19

| work=HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index

| title=HD 215721 | first1=N. D. | last1=Kostjuk

| publisher=Institute of Astronomy of Russian Academy of Sciences

| year=2002 }}; CDS ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?cat=IV%2F27A&target=readme IV/27A].

}}

Category:G-type giants

Category:Horizontal-branch stars

Category:Aquarius (constellation)