Back Alpha Pictoris Afrikaans سهيل بلقين Arabic Alfa Pictoris AST Alfa del Cavallet de Pintor Catalan Alfa Pictoris Czech Alfa Pictoris Spanish آلفا سه‌پایه Persian Alpha Pictoris French अल्फ़ा पिक्टोरिस तारा Hindi Alfa Pictoris Italian

Alpha Pictoris

α Pictoris
Location of α Pictoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 06h 48m 11.45512s[1]
Declination −61° 56′ 29.0008″[1]
Apparent magnitude (V) 3.27[2]
Characteristics
Spectral type A8 Vn kA6[3]
U−B color index +0.13[2]
B−V color index +0.21[2]
Astrometry
Radial velocity (Rv)+20.6[4] km/s
Proper motion (μ) RA: –66.07[1] mas/yr
Dec.: +242.97[1] mas/yr
Parallax (π)33.78 ± 1.78 mas[1]
Distance97 ± 5 ly
(30 ± 2 pc)
Absolute magnitude (MV)0.86[5]
Orbit[6]
Period (P)1,316±2 days
Semi-major axis (a)3.25 AU[a]
Eccentricity (e)0.29±0.02
Inclination (i)121±2°
Longitude of the node (Ω)219±4°
Periastron epoch (T)2456390±13 BJD
Argument of periastron (ω)
(secondary)		353±4°
Details
A
Mass1.6±0.1[6] M☉
Radius1.6[7] R☉
Luminosity13[8] L☉
Surface gravity (log g)3.48[9] cgs
Temperature7530[9] K
Metallicity [Fe/H]–0.11[3] dex
Rotational velocity (v sin i)206[10] km/s
Age660[11][12] Myr
B
Mass1.05±0.05[6] M☉
Temperature5,068±91[6] K
Other designations
CD-61°1478, Gl 248, HD 50241, HIP 32607, HR 2550, LTT 2656, SAO 249647.[13]
Database references
SIMBADdata

Alpha Pictoris (α Pic, α Pictoris) is the brightest star in the southern constellation of Pictor. It has an apparent visual magnitude of 3.27,[2] which is bright enough to be viewed from urban areas in the southern hemisphere. This is actually a binary star system, whose components complete an orbit every three years and seven months.[6] It is close enough for its distance to be measured using parallax shifts, which yields a value of roughly 97 light-years (30 parsecs) from the Sun, with a 5% margin of error.[1] Alpha Pictoris has the distinction of being the south pole star of the planet Mercury.[14]

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  14. ^ Cite error: The named reference moore2007 was invoked but never defined (see the help page).


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