Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Puppis |
Right ascension | 07h 49m 17.65567s [1] |
Declination | −24° 51′ 35.2305″ [1] |
Apparent magnitude (V) | 3.35 [2] |
Characteristics | |
Spectral type | G6 Iab-Ib [3] |
U−B color index | +1.18 [2] |
B−V color index | +1.25 [2] |
Astrometry | |
Radial velocity (Rv) | +2.7 [4] km/s |
Proper motion (μ) |
RA: −4.81
[1]
mas/
yr Dec.: −0.89 [1] mas/ yr |
Parallax (π) | 2.72 ± 0.21 mas [1] |
Distance | 1,200 ± 90
ly (370 ± 30 pc) |
Absolute magnitude (MV) | –3.89 [5] |
Details | |
Mass | 9.9 ± 1.0 [3] M☉ |
Radius | 124 [6] R☉ |
Luminosity | 6,824±641 [6] L☉ |
Surface gravity (log g) | 0.529 [6] cgs |
Temperature | 4,712±125, [6] 4,925 [5] K |
Metallicity [Fe/H] | +0.13 [5] dex |
Rotational velocity (v sin i) | 9.2 [7] km/s |
Age | 23 [3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Xi Puppis (ξ Puppis, abbreviated Xi Pup, ξ Pup) is a multiple star system in the southern constellation of Puppis. With an apparent visual magnitude of 3.35, [2] it is one of the brighter members of this constellation. Based on parallax measurements made during the Hipparcos mission, it is located approximately 1,200 light-years (370 parsecs) from the Sun, with a 7.5% margin of error. [1]
The system consists of a spectroscopic binary, designated Xi Puppis A, [8] together with a third companion star, Xi Puppis B. A's two components are themselves designated Xi Puppis Aa (formally named Azmidi /ˈæzmɪdi/) [9] and Ab.
ξ Puppis ( Latinised to Xi Puppis) is the system's Bayer designation. The designations of the two constituents as Xi Puppis A and B, and those of A's components - Xi Puppis Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). [10]
The system was sometimes known as Asmidiske (Azmidiske), a misspelling and misplacement of Aspidiske (from the Greek for 'little shield), the traditional name of Iota Carinae. [11] In 2016, the IAU organized a Working Group on Star Names (WGSN) [12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [13] It approved the name Azmidi for the component Xi Puppis Aa on 1 June 2018 and it is now so included in the List of IAU-approved Star Names. [9]
Because of the distance of this system from the Earth, its visual magnitude is reduced by 0.73 as a result of extinction from the intervening gas and dust. [14]
Xi Puppis A presents as a yellow supergiant of spectral class G6 with a luminosity 8,300 times that of the Sun. [11]
The 13th-magnitude companion, Xi Puppis B, is about 5 arcseconds distant and is a Sun-like star that orbits at least 2000 AU away with an orbital period of at least 26,000 years. [11]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Puppis |
Right ascension | 07h 49m 17.65567s [1] |
Declination | −24° 51′ 35.2305″ [1] |
Apparent magnitude (V) | 3.35 [2] |
Characteristics | |
Spectral type | G6 Iab-Ib [3] |
U−B color index | +1.18 [2] |
B−V color index | +1.25 [2] |
Astrometry | |
Radial velocity (Rv) | +2.7 [4] km/s |
Proper motion (μ) |
RA: −4.81
[1]
mas/
yr Dec.: −0.89 [1] mas/ yr |
Parallax (π) | 2.72 ± 0.21 mas [1] |
Distance | 1,200 ± 90
ly (370 ± 30 pc) |
Absolute magnitude (MV) | –3.89 [5] |
Details | |
Mass | 9.9 ± 1.0 [3] M☉ |
Radius | 124 [6] R☉ |
Luminosity | 6,824±641 [6] L☉ |
Surface gravity (log g) | 0.529 [6] cgs |
Temperature | 4,712±125, [6] 4,925 [5] K |
Metallicity [Fe/H] | +0.13 [5] dex |
Rotational velocity (v sin i) | 9.2 [7] km/s |
Age | 23 [3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Xi Puppis (ξ Puppis, abbreviated Xi Pup, ξ Pup) is a multiple star system in the southern constellation of Puppis. With an apparent visual magnitude of 3.35, [2] it is one of the brighter members of this constellation. Based on parallax measurements made during the Hipparcos mission, it is located approximately 1,200 light-years (370 parsecs) from the Sun, with a 7.5% margin of error. [1]
The system consists of a spectroscopic binary, designated Xi Puppis A, [8] together with a third companion star, Xi Puppis B. A's two components are themselves designated Xi Puppis Aa (formally named Azmidi /ˈæzmɪdi/) [9] and Ab.
ξ Puppis ( Latinised to Xi Puppis) is the system's Bayer designation. The designations of the two constituents as Xi Puppis A and B, and those of A's components - Xi Puppis Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). [10]
The system was sometimes known as Asmidiske (Azmidiske), a misspelling and misplacement of Aspidiske (from the Greek for 'little shield), the traditional name of Iota Carinae. [11] In 2016, the IAU organized a Working Group on Star Names (WGSN) [12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [13] It approved the name Azmidi for the component Xi Puppis Aa on 1 June 2018 and it is now so included in the List of IAU-approved Star Names. [9]
Because of the distance of this system from the Earth, its visual magnitude is reduced by 0.73 as a result of extinction from the intervening gas and dust. [14]
Xi Puppis A presents as a yellow supergiant of spectral class G6 with a luminosity 8,300 times that of the Sun. [11]
The 13th-magnitude companion, Xi Puppis B, is about 5 arcseconds distant and is a Sun-like star that orbits at least 2000 AU away with an orbital period of at least 26,000 years. [11]