20 Puppis

{{Starbox image

|image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=20 Puppis

|x=247|y=257

}}

| caption=Location of 20 Puppis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Puppis

| ra = {{RA|08|13|19.96710}}

| dec = {{DEC|-15|47|17.6008}}

| appmag_v = 4.99

}}

{{Starbox character

| class = G4 Ib-II

| b-v = +1.07

| u-b = +0.78

}}

{{Starbox astrometry

| radial_v = +16.80

| prop_mo_ra = −12.718

| prop_mo_dec = −4.270

| parallax = 3.2906

| p_error = 0.1404

| parallax_footnote =

| absmag_v = −2.12

}}

{{Starbox detail

| mass = {{Val|5.2|0.2}}

| radius = {{Val|47.60|1.55|1.16}}

| luminosity = {{Val|1087.12|53.98|fmt=commas}}

| temperature = {{Val|4804|59|77|fmt=commas}}

| gravity = 0.80

| metal_fe = −0.18

| rotational_velocity = 6.9

| age_myr = 90

}}

{{Starbox catalog

| names = {{odlist | F=20 Pup | BD=-15°2324 | FK5=311 | HD=68752 | HIP=40259 | HR=3229 | SAO=153993 | GC=11184 | GSC=05996-02764 }}

}}

{{Starbox reference

| Simbad = 20+Puppis

}}

20 Puppis is a solitary star in the southern constellation of Puppis. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.99. The star lies approximately 990 light years away from the Sun based on parallax. It is receding from the Earth with a heliocentric radial velocity of +16.8 km/s.

This object has a stellar classification of G4 Ib-II, matching a G-type star with a luminosity class part way between a bright giant and a supergiant star. It is just 90 million years old with around five times the mass of the Sun. The star has expanded to 48 times the Sun's radius and is radiating 1,087 times as much luminosity as the Sun from its enlarged photosphere at an effective temperature of 4,804 K.

References

{{reflist|refs=

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

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

{{Cite journal

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}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bAS/139/433/table5&Name=HD%2068752 Vizier catalog entry]

{{cite journal

| last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François

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| bibcode=2016A&A...591A.118S | arxiv=1605.07384

| doi=10.1051/0004-6361/201628497 | s2cid=119258214 }}

{{cite journal

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| last4=Rachkovskaya | first4=Tamara M. | last5=Poklad | first5=Dmitry B.

| title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood

| journal=Monthly Notices of the Royal Astronomical Society

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| bibcode=2010MNRAS.402.1369L | arxiv=0911.1335

| doi=10.1111/j.1365-2966.2009.15979.x | doi-access=free | s2cid=119096173 }}

{{cite journal

| title=A catalogue of multiplicity among bright stellar systems

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| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869 | date=2008

| doi=10.1111/j.1365-2966.2008.13596.x

| doi-access=free | arxiv=0806.2878 | bibcode=2008MNRAS.389..869E | s2cid=14878976 }}

}}

Category:G-type bright giants

Category:G-type supergiants