Pi Puppis

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π Puppis
Template:Location mark
Location of π Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 2.69Template:Snd2.76[2]
Characteristics
Spectral type K3 Ib[3]
U−B Template:Engvar +1.238[4]
B−V Template:Engvar +1.608[4]
Variable type SRd[5]
Astrometry
Radial velocity (Rv)+15.8[6] km/s
Proper motion (μ) RA: −10.05[1] mas/yr
Dec.: +6.47[1] mas/yr
Parallax (π)4.04±0.33 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−4.5[7]
Details
MassTemplate:Val[8] Template:Solar mass
Radius235[9] Template:Solar radius
Luminosity11,378[9] Template:Solar luminosity
Surface gravity (log g)0.13[9] cgs
Temperature3,990–4,055[10] K
AgeTemplate:Val[8] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Pi Puppis, Latinized from π Puppis, also named Ahadi,[12][13] is the second-brightest star in the southern constellation of Puppis. It has an apparent visual magnitude of about 2.7, so it can be viewed with the naked eye at night. Parallax measurements yield an estimated distance of roughly Template:Convert from the Earth. This is a double star with a magnitude 6.86 companion at an angular separation of 0.72 arcsecond and a position angle of 148° from the brighter primary.[14]

File:PiPupLightCurve.png
A light curve for Pi Puppis, plotted from Hipparcos data,[15] folded with the period derived by Koen and Eyer (2002)[16]

The spectrum of Pi Puppis matches a stellar classification of K3 Ib.[3] The Ib luminosity class indicates this a lower luminosity supergiant star that has consumed the hydrogen fuel at its core, evolved away from the main sequence, and expanded to about 235 times the Sun's radius. The effective temperature of the star's outer envelope is approximately Template:Val,[10] which gives it the orange hue of a K-type star.[17] With a mass 11.7 times that of the Sun, this is a short-lived star with an estimated age of 20 million years.[8]

It is a semiregular variable star[5] that varies in apparent magnitude from a high of 2.70 down to 2.85.[18] Pi Puppis is the brightest star in the open cluster Collinder 135.[19]

Nomenclature

The star has the traditional name Ahadi, which is derived from Arabic for "having much promise".[12]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Bow and Arrow,[20] refers to an asterism consisting of π Puppis, δ Canis Majoris, η Canis Majoris, HD 63032, HD 65456, ο Puppis, k Puppis, ε Canis Majoris and κ Canis Majoris. Consequently, π Puppis itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[21]

Observation

File:Cr135Stellarium.png
Collinder 135

Pi Puppis is a semiregular variable star[5] with an apparent magnitude of 2.733.[4] It appears slightly orange in color with a B-V color index of +1.608, similar to that of the famous Mira.[22] It is typically the second brightest star in Puppis, only behind the blue supergiant Naos,[2] and the brightest star in the open cluster Collinder 135.[19]

About every five years, the Pi Puppids, a meteor shower associated with the comet 26P/Grigg–Skjellerup, appears near the star in late April.[19] The Pi Puppids are a variable meteor shower, with varying maximums each year.[23]

References

Template:Reflist

External links

Template:Stars of Puppis

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named vsx
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named houk1979
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named sps1966
  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named ibvs4659
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named rgcrv
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named parsons
  8. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named mnras410_1_190
  9. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named mcdonald2017
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named mnras414_1_418
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named PUPPIS
  12. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Poppele2010
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SkyMap
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa356_141
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Koen
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named burnham1978
  19. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aj88_197
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named KooShe
  21. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named zh
  22. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj87
  23. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MDC
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