24 Capricorni

{{Short description|Star in the southern constellation of Capricornus.}}

{{Starbox image

| image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=12|mark_link=Alpha1

|x=450|y=718

}}

|caption=Location of α Capricorni (red circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Capricornus

| ra = {{RA|21|07|07.66733}}

| dec = {{DEC|−25|00|21.0790}}

| appmag_v = +4.49

}}

{{Starbox character

| type = AGB

| class = M1− III

| b-v = {{Val|1.604|0.005}}

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+32.1|0.8}}

| prop_mo_ra = −28.09

| prop_mo_dec = −44.14

| parallax = 7.15

| p_error = 0.22

| parallax_footnote =

| absmag_v = −1.24

}}

{{Starbox detail

| source =

| mass =

| radius = {{Val|54.06|1.88|2.72}}

| luminosity = {{Val|611|41}}

| gravity =

| temperature = {{Val|3903|102|66|fmt=commas}}

| metal_fe =

| rotational_velocity =

| age_myr =

}}

{{Starbox catalog

| names = {{odlist | name=A Capricorni | F=24 Cap | CD=−25° 15235 | FK5=791 | HD=200914 | HIP=104234 | HR=8080 | SAO=190025 | WDS+J21071-2500A | GC=29490 | ADS=14632 | CCDM=J21071-2500 }}

}}

{{Starbox reference

| Simbad = 24+Cap

}}

24 Capricorni or A Capricorni is a single star in the southern constellation of Capricornus. This object is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of +4.49. It is approximately 460 light years from the Sun, based on parallax. The star is moving further from the Earth with a heliocentric radial velocity of +32 km/s.

This is an aging red giant, currently on the asymptotic giant branch, with a stellar classification of M1− III; a star that has exhausted the supply of hydrogen at its core and expanded to 54 times the Sun's radius. It is radiating 611 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,903 K.

Chinese name

In R. H. Allen's book, this star is described as having the name Tsoo, representing the state of Chu. Bayer described it as one of the last three stars of the tail of the goat, although this is not how they appear in modern visual representations of the constellation

References

{{Reflist|refs=

{{citation |url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Capricornus*.html |title=Star Names |author=R.H.Allen |page=142 |accessdate=2019-06-10 | postscript=.}}

{{citation |url=http://www.uranometriaargentina.com/ |title=URANOMETRIA ARGENTINA |author=Benjamin Apthorp Gould |author-link=Benjamin Apthorp Gould |accessdate=2019-06-10 |postscript=. |archive-url=https://web.archive.org/web/20120227032716/http://www.uranometriaargentina.com/ |archive-date=2012-02-27 |url-status=dead }}

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F. | postscript=.

| journal=Astronomy and Astrophysics

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

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

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}

{{citation

| last1=Keenan | first1=P. C. | last2=McNeil | first2=R. C.

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

| journal=The Astrophysical Journal Supplement Series

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