This article is about i Scorpii. Not to be confused with ι Scorpii.
22 Scorpii
Observation data Epoch J2000 Equinox J2000
Constellation
Scorpius
Right ascension
16h 30m 12.47514s[1]
Declination
−25° 06′ 54.8043″[1]
Apparent magnitude (V)
4.78[2]
Characteristics
Spectral type
B3 V[3]
Astrometry
Proper motion (μ)
RA: −4.45[1] mas/yr Dec.: −26.33[1] mas/yr
Parallax (π)
7.89 ± 0.24 mas[1]
Distance
410 ± 10 ly (127 ± 4 pc)
Absolute magnitude (MV)
−0.72[4]
Details
Mass
6.1±0.1[5]M☉
Luminosity
334.57[4]L☉
Temperature
19,600[2] K
Rotational velocity (v sin i)
169±4[2] km/s
Age
10.5±2.1[5] Myr
Other designations
i Sco, 22 Sco, CD−24°12695, HD 148605, HIP 80815, HR 6141, SAO 184429[6]
Database references
SIMBAD
data
22 Scorpii (i Scorpii) is a single[7] star in the southern zodiac constellation of Scorpius, about one degree from Antares. It is faintly visible to the naked eye with an apparent visual magnitude of 4.78.[2] The distance to this star is estimated to be around 410 light years, as derived from its annual parallax shift of 7.89±0.24 mas.[1] The star is embedded in, or adjacent to, the diffuse nebulous cloud IC 4605 located in the western regions of the Rho Ophiuchi cloud complex.[8]
22 Scorpii in the IC 4605 reflection nebula, one of a collection of diffuse and dark nebulae in the Rho Ophiuchi cloud complex.
22 Scorpii is a B-type main-sequence star with a stellar classification of B3 V.[3] It is ten[5] million years old and has a high rate of spin with a projected rotational velocity of 169 km/s.[2] The star has about six[5] times the mass of the Sun and is radiating 335[4] times the Sun's luminosity from its photosphere at an effective temperature of 19,600 K.[2]
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^Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
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22Scorpii (i Scorpii) is a single star in the southern zodiac constellation of Scorpius, about one degree from Antares. It is faintly visible to the...
designation α Scorpii, which is Latinised to Alpha Scorpii. Often referred to as "the heart of the scorpion", Antares is flanked by σ Scorpii and τ Scorpii near...
Delta Scorpii (Latinised from δ Scorpii, abbreviated Delta Sco, δ Sco) is a binary star (the presence of a third star in the system is being debated)...
Nu Scorpii (ν Scorpii, abbreviated Nu Sco, ν Sco) is a multiple star system in the constellation of Scorpius. It is most likely a septuple star system...
Beta Scorpii (β Scorpii, abbreviated Beta Sco, β Sco) is a multiple star system in the southern zodiac constellation of Scorpius. It bore the traditional...
Upsilon Scorpii (υ Scorpii, abbreviated Upsilon Sco, υ Sco), formally named Lesath /ˈliːsæθ/, is a star located in the "stinger" of the southern zodiac...
AR Scorpii (AR Sco) is a binary pulsar that consists of a white dwarf and a red dwarf. It is located close to the ecliptic plane in the constellation...
Sigma Scorpii (or σ Scorpii, abbreviated Sigma Sco or σ Sco), is a multiple star system in the constellation of Scorpius, located near the red supergiant...
consisting of Pi Scorpii, Rho Scorpii, Delta Scorpii, Beta¹ Scorpii and Beta² Scorpii. Consequently, the Chinese name for Pi Scorpii itself is 房宿一 (Fáng...
Mu2 Scorpii (μ2 Scorpii, abbreviated Mu2 Sco, μ2 Sco), also named Pipirima /pɪˈpɪrɪmə/, is a star in the zodiac constellation of Scorpius. It has an apparent...
18 Scorpii is a solitary star located at a distance of some 46.1 light-years (14.13 parsecs) from the Sun at the northern edge of the Scorpius constellation...
Tau Scorpii, Latinized from τ Scorpii, formally known as Paikauhale /ˌpaɪkaʊˈhɑːleɪ/, is a star in the southern zodiac constellation of Scorpius. The...
Rho Scorpii (ρ Scorpii, abbreviated Rho Sco, ρ Sco) is a double star in the constellation of Scorpius. It has an apparent visual magnitude of +3.87, which...
G Scorpii (abbreviated G Sco), also named Fuyue, is a giant star in the constellation of Scorpius. It has an apparent magnitude of +3.19. It is approximately...
Omicron Scorpii (ο Sco, ο Scorpii) is a star in the zodiac constellation of Scorpius. With an apparent visual magnitude of +4.57, it is visible to the...
ω2 Scorpii, Latinised as Omega2 Scorpii, is a suspected variable star in the zodiac constellation of Scorpius. A component of the visual double star ω...
Xi Scorpii (ξ Sco) is part of a quintuple star system in the constellation Scorpius. It was assigned this designation by Bayer, although Ptolemy had catalogued...
magnitude varies between 6.22 and 6.64, being heavily diminshed by 2.93 magnitudes due to interstellar extinction. V915 Scorpii is surrounded by the sparse...
Chi Scorpii, Latinized from χ Scorpii, is a single star in the zodiac constellation of Scorpius. It has an orange hue and can be faintly seen with the...
large blue area (IC 4604), Antares in the large yellow area and Sigma Scorpii in the redish Sh2-9 area, with Messier 4 inbetween the latter two stars...
Zeta2 Scorpii (Zeta2 Sco, ζ2 Scorpii, ζ2 Sco) is a K-type orange giant star in the constellation of Scorpius. It has an apparent visual magnitude which...
24 Scorpii is a star that was originally placed by John Flamsteed within the constellation of Scorpius but in now placed within the southeastern constellation...
winter solstice. This is the northern limit of the visibility of the star θ Scorpii and thus of the 'tail' of the constellation Scorpius. Starting at the Prime...
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