Pi Puppis
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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] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −4.5[7] |
| Details | |
| Mass | Script error: No such module "val".[8] Template:Solar mass |
| Radius | 235[9] Template:Solar radius |
| Luminosity | 11,378[9] Template:Solar luminosity |
| Surface gravity (log g) | 0.13[9] cgs |
| Temperature | 3,990–4,055[10] K |
| Age | Script error: No such module "val".[8] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[11] | |
| Database references | |
| SIMBAD | data |
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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 Script error: No such module "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]
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 Script error: No such module "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
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
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- ↑ 弧矢 (Hú Shǐ) is westernized into Koo She. R.H. Allen had opinion that Koo She refers to the asterism including δ Velorum and ω Velorum. AEEA opinion is, δ Velorum is member of Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Earth God's Temple asterism and ω Velorum is not member of any asterisms. 天社 (Tiān Shè)is westernized into Tseen She and R.H.Allen used the term Tseen She for Chinese name of η Carinae. See Richard Hinckley Allen: Star Names — Their Lore and Meaning: Argo Navis and Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 17 日 Template:Webarchive.
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日 Template:Webarchive
- ↑ Script error: No such module "Citation/CS1".
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