Omega2 Aquarii

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Template:Short description Template:Other stars by Bayer designation

Omega2 Aquarii
Template:Location mark
Location of ω2 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.49[3]
Characteristics
Spectral type B9 V[4] + A5V[5]
U−B Template:Engvar −0.12[3]
B−V Template:Engvar −0.04[3]
Astrometry
Radial velocity (Rv)+3.2±2.3[6] km/s
Proper motion (μ) RA: +98.578 mas/yr[2]
Dec.: −66.231 mas/yr[2]
Parallax (π)20.8948±0.1589 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.20[1]
Details
A
Mass2.6Script error: No such module "Su".[7] Template:Solar mass
Radius1.94±0.06[8] Template:Solar radius
Luminosity37[1] Template:Solar luminosity
Surface gravity (log g)4.22±0.03[8] cgs
Temperature10,504±91[8] K
RotationScript error: No such module "convert".[9]
Rotational velocity (v sin i)148[10] km/s
Age109Script error: No such module "Su".[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Omega2 Aquarii is a star[12] system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinised from ω2 Aquarii, and abbreviated Omega2 Aqr or ω2 Aqr. The system can be seen with the naked eye as a faint point of light, having an apparent visual magnitude of 4.49.[3] The approximate distance to this star, Script error: No such module "convert"., is known from parallax measurements.[2]

This is a B-type main-sequence star with a stellar classification of B9 V.[4] In 1953, astronomers H. L. Johnson and W. W. Morgan selected it as the MK standard for stars of class B9.5V.[13] It has an estimated age of 109[7] million years and is spinning rapidly with a projected rotational velocity of 148 km/s,[10] giving it a rotation period of Script error: No such module "convert"..[9] The star has 2.6[7] times the Sun's mass and nearly double the radius of the Sun.[8] It is radiating 37[1] times the luminosity of the Sun from its photosphere at an effective temperature of Script error: No such module "val".,[8] giving it the blue-white hue of a B-type star.[14]

In 1983, this was catalogued as a spectroscopic binary star system with components classed B9V and B9.5V.[5] However, a 2012 survey by R. Chini et al found the star to have a constant radial velocity.[12] There is a companion star at an angular separation of 5.7 arcseconds that shares a common proper motion with the primary. It is an A-type main-sequence star with a visual magnitude of 9.5.[5] This system is among the 100 strongest stellar X-ray sources within Script error: No such module "convert". of the Sun. It is emitting an X-ray luminosity of Script error: No such module "val".·s−1. The source for this X-ray emission is unknown.[15]

References

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  1. ↑ a b c d Script error: No such module "citation/CS1".
  2. ↑ a b c d e Template:Cite Gaia DR3
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b c Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ a b c d Script error: No such module "citation/CS1".
  8. ↑ a b c d e Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Aquarius

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