Omicron1 Centauri

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ο1 Centauri
Template:Location mark
Location of ο1 Cen (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +5.13[2]
Characteristics
Evolutionary stage Yellow hypergiant
Spectral type G3 0-Ia[3][4]
B−V Template:Engvar +1.08[2]
Variable type SRd[5]
Astrometry
Radial velocity (Rv)−20.00[6] km/s
Proper motion (μ) RA: −4.491[1] mas/yr
Dec.: +1.604[1] mas/yr
Parallax (π)0.3254±0.0734 mas[1]
DistanceScript error: No such module "val". ly
(Script error: No such module "val". pc)[7]
Absolute magnitude (MV)−9.0[4]
Details
MassScript error: No such module "val".[8] Template:Solar mass
RadiusScript error: No such module "val".[8] Template:Solar radius
Luminosity68,000[9] Template:Solar luminosity
Surface gravity (log g)0.19[10] cgs
Temperature5,700[9] K
Age10–12[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
HR 4441, HD 100261, CD−58°4100, HIP 56243, SAO 239145, GC 15818, CCDM J11318-5927, AAVSO 1127-58
Database references
SIMBADdata

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Omicron1 Centauri (ο1 Cen, ο1 Centauri) is a star in the constellation Centaurus. It is approximately 10,000 light years from Earth, though this is very uncertain.

File:Omicron1CenLightCurve.png
A light curve for Omicron1 Centauri, adapted from O'Connell (1961)[11]

ο1 Centauri is a yellow G-type supergiant or hypergiant with a mean apparent magnitude of +5.13. Daniel Joseph Kelly O'Connell discovered that the star is a variable star by studying photographic plates taken from 1934 to 1952, and announced his discovery in 1961.[12] It is classified as a semiregular variable star and its brightness varies from magnitude +5.8 to +6.6 with a period of 200 days.[5] Other studies have reported only small brightness variations.[13][14] It is the MK spectral standard for class G3 O-Ia,[15] indicating a highly luminous mass-losing hypergiant star. It has also be classified as F8 Ia0[16] and F7 Ia/ab.[17] The size, luminosity, and distance are equally uncertain.

ο1 Cen forms a very close naked eye double star with ο2 Centauri, a hotter blue supergiant that may be physically associated. ο1 Cen also has an 11th magnitude companion only 13.5" distant,[18] although it appears to be a foreground star unrelated to the other two.[19] ο1 Cen is located very close to V382 Carinae, the brightest yellow hypergiant star in the night sky.

References

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  7. ↑ Script error: No such module "Citation/CS1". Data about this star can be seen here.
  8. ↑ a b Script error: No such module "Citation/CS1".
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  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Template:Cite Gaia DR3

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Template:Stars of Centaurus

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