Delta Pavonis: Difference between revisions

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'''Delta Pavonis''', [[Romanization of Greek|Latinized]] from δ Pavonis, is a single<ref name=Fuhrmann2017/> [[star]] in the southern [[constellation]] of [[Pavo (constellation)|Pavo]]. It has an [[apparent visual magnitude]] of 3.56,<ref name=SIMBAD/> making it a fourth-magnitude star that is visible to the naked eye from the southern hemisphere. [[Stellar parallax|Parallax]] measurements yield an estimated distance of {{Convert|19.89|ly|pc|abbr=off|lk=on}} from [[Earth]].<ref name=GaiaDR3/> This makes it one of the [[List of nearest bright stars|nearest bright stars]] to the Solar System. It is approaching the Sun with a [[radial velocity]] of −23.5&nbsp;km/s, and is predicted to come as close as {{convert|5.4693|pc|ly|1|disp=out|abbr=off}} in around 49,200&nbsp;years.<ref name=Bailer2018/>
'''Delta Pavonis''' is a single [[star]]<ref name=Fuhrmann2017/> in the southern [[constellation]] of [[Pavo (constellation)|Pavo]]. Its name is a [[Bayer designation]] that is [[Romanization of Greek|Latinized]] from '''δ Pavonis''', and abbreviated Delta Pav or δ Pav. It has an [[apparent visual magnitude]] of 3.56,<ref name=SIMBAD/> making it a fourth-magnitude star that is visible to the naked eye from the southern hemisphere. [[Stellar parallax|Parallax]] measurements yield an estimated distance of {{Convert|19.89|ly|pc|abbr=off|lk=on}} from [[Earth]].<ref name=GaiaDR3/> This makes it one of the [[List of nearest bright stars|nearest bright stars]] to the Solar System. It is approaching the Sun with a [[radial velocity]] of −23.5&nbsp;km/s, and is predicted to come as close as {{convert|5.4693|pc|ly|1|disp=out|abbr=off}} in around 49,200&nbsp;years.<ref name=Bailer2018/>


==Observations==
==Physical characteristics==
This object is a [[subgiant]] of [[spectral type]] G8&nbsp;IV; it will stop [[nuclear fusion|fusing]] [[hydrogen]] at its [[stellar core|core]] relatively soon, starting the process of becoming a [[red giant]]. Hence, Delta Pavonis is 24% brighter than the Sun, but the [[effective temperature]] of its [[stellar atmosphere|outer atmosphere]] is less: 5,571&nbsp;K.<ref name=Rains2020/> Its mass is 107% of [[solar mass|Sun's mass]],<ref name=Carvalho-Silva2025/> with a radius 120% of [[solar radius|Sun's radius]].<ref name=Rains2020/> Delta Pavonis's surface [[convection zone]] extends downward to about 43.1% of the star's radius, but only contains 4.8% of the star's mass.<ref name=takeda08/>
This object is a [[subgiant]] of [[spectral type]] G8&nbsp;IV; it will stop [[nuclear fusion|fusing]] [[hydrogen]] at its [[stellar core|core]] relatively soon, starting the process of becoming a [[red giant]]. Hence, Delta Pavonis is 24% brighter than the Sun, but the [[effective temperature]] of its [[stellar atmosphere|outer atmosphere]] is less: 5,571&nbsp;K.<ref name=Rains2020/> Its mass is 107% of [[solar mass|Sun's mass]],<ref name=Carvalho-Silva2025/> with a radius 120% of [[solar radius|Sun's radius]].<ref name=Rains2020/> Delta Pavonis's surface [[convection zone]] extends downward to about 43.1% of the star's radius, but only contains 4.8% of the star's mass.<ref name=takeda08/>


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==SETI==
==SETI==
Delta Pavonis has been identified by Maggie Turnbull and [[Jill Tarter]] of the [[SETI Institute]] as the "Best [[SETI]] target" among the  100 closest [[G-type star]]s. Properties in its favor include a high metallicity, minimal level of [[stellar magnetic field|magnetic activity]], low rotation rate, and kinematic membership in the [[thin disk population]] of the [[Milky Way]]. [[Gas giant]]s orbiting in, near, or through a star's [[habitable zone]] may destabilize the orbits of terrestrial planets in that zone; the lack of detected [[radial velocity]] variation suggests that there are no such gas giants orbiting Delta Pavonis. However, observation has detected no artificial radio sources.<ref name=apj149_2/> Delta Pavonis, a close [[Photometry (astronomy)|photometric]] match to the Sun, is the nearest [[solar analog]] that is not a member of a binary or multiple [[star system]].<ref name=Mello/>
Delta Pavonis has been identified by Maggie Turnbull and [[Jill Tarter]] of the [[SETI Institute]] as the "Best [[SETI]] target" among the  100 closest [[G-type star]]s. Properties in its favor include a high metallicity, minimal level of [[stellar magnetic field|magnetic activity]], low rotation rate, and kinematic membership in the [[thin disk population]] of the [[Milky Way]]. [[Gas giant]]s orbiting in, near, or through a star's [[habitable zone]] may destabilize the orbits of terrestrial planets in that zone; the lack of detected [[radial velocity]] variation suggests that there are no such gas giants orbiting Delta Pavonis. However, observation has detected no artificial radio sources.<ref name=apj149_2/> Delta Pavonis, a close [[Photometry (astronomy)|photometric]] match to the Sun, is the nearest [[solar analog]] that is not a member of a binary or multiple [[star system]].<ref name=Mello/>
==See also==
* [[List of nearest stars by spectral type#List of nearest G-type stars|List of nearest G-type stars]]


==References==
==References==

Latest revision as of 15:45, 15 June 2025

Template:Short description

Delta Pavonis
Template:Location mark
Location of δ Pavonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pavo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.56[2]
Characteristics
Spectral type G8 IV[3]
U−B Template:Engvar 0.45[2]
B−V Template:Engvar 0.76[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: +1,211.761 mas/yr[1]
Dec.: –1,130.237 mas/yr[1]
Parallax (π)163.9544±0.1222 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.62[6]
Details
MassTemplate:Val[7] Template:Solar mass
RadiusTemplate:Val[8] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]Template:Val[7] dex
RotationTemplate:Val[9]
Rotational velocity (v sin i)0.32[8] km/s
AgeTemplate:Val[7] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Delta Pavonis is a single star[11] in the southern constellation of Pavo. Its name is a Bayer designation that is Latinized from δ Pavonis, and abbreviated Delta Pav or δ Pav. It has an apparent visual magnitude of 3.56,[10] making it a fourth-magnitude star that is visible to the naked eye from the southern hemisphere. Parallax measurements yield an estimated distance of Template:Convert from Earth.[1] This makes it one of the nearest bright stars to the Solar System. It is approaching the Sun with a radial velocity of −23.5 km/s, and is predicted to come as close as Template:Convert in around 49,200 years.[5]

Physical characteristics

This object is a subgiant of spectral type G8 IV; it will stop fusing hydrogen at its core relatively soon, starting the process of becoming a red giant. Hence, Delta Pavonis is 24% brighter than the Sun, but the effective temperature of its outer atmosphere is less: 5,571 K.[8] Its mass is 107% of Sun's mass,[7] with a radius 120% of Sun's radius.[8] Delta Pavonis's surface convection zone extends downward to about 43.1% of the star's radius, but only contains 4.8% of the star's mass.[12]

Spectroscopic examination of Delta Pavonis shows that it has a higher abundance of elements heavier than helium (metallicity) than does the Sun. This value is typically given in terms of the ratio of iron (chemical symbol Fe) to hydrogen (H) in a star's atmosphere, relative to that in Sun's atmosphere (iron being a good proxy for the presence of other heavy elements). The metallicity of Delta Pavonis is approximately

[FeH] = 0.371

This notation gives the logarithm of the iron-to-hydrogen ratio, relative to that of the Sun, meaning that Delta Pavonis's iron abundance is 235% of that of Sun.[7] It is considered super metal-rich, and the high metallicity has slowed its evolution.[13] Studies have shown a correlation between abundant heavy elements in stars, and the presence of a planetary system,[14] so Delta Pavonis has a greater than average probability of harboring planets.[13]

The age of Delta Pavonis is approximately 6.1 billion years.[7] It appears to be rotating slowly, with a projected rotational velocity of 0.32 kilometers per second.[8]

Possible planetary system

The existence of a Jupiter-mass gas giant on a long-period orbit around Delta Pavonis is suspected, as of 2021, based on astrometric data.[15] A study in 2023 detected a trend in the star's radial velocity, which may indicate the presence of a planetary companion, supporting the previous astrometric result. Such a planet would, at minimum, orbit with a period of 37 years at a distance of Template:Val, and have a mass at least Template:Val (Template:Jupiter mass).[9]

Template:OrbitboxPlanet begin Template:Orbitbox planet hypothetical Template:Orbitbox end

SETI

Delta Pavonis has been identified by Maggie Turnbull and Jill Tarter of the SETI Institute as the "Best SETI target" among the 100 closest G-type stars. Properties in its favor include a high metallicity, minimal level of magnetic activity, low rotation rate, and kinematic membership in the thin disk population of the Milky Way. Gas giants orbiting in, near, or through a star's habitable zone may destabilize the orbits of terrestrial planets in that zone; the lack of detected radial velocity variation suggests that there are no such gas giants orbiting Delta Pavonis. However, observation has detected no artificial radio sources.[16] Delta Pavonis, a close photometric match to the Sun, is the nearest solar analog that is not a member of a binary or multiple star system.[13]

See also

References

Template:Reflist

Further reading

Template:Div col

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Template:Div col end

External links

  • Script error: No such module "citation/CS1".

Template:Sky Template:Nearest systems Template:Stars of Pavo

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named rob64
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aj132_1_161
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Ruban2006
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Bailer2018
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named cgssn09
  7. ↑ a b c d e f g h Cite error: Invalid <ref> tag; no text was provided for refs named Carvalho-Silva2025
  8. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Rains2020
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Laliotis2023
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Fuhrmann2017
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named takeda08
  13. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Mello
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa458_3
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MakarovZacharias2021
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj149_2
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