Sigma Arietis

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description

σ Arietis
Template:Location mark
Location of σ Arietis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.52[3]
Characteristics
Spectral type B7 V[4]
U−B Template:Engvar −0.43[3]
B−V Template:Engvar −0.09[3]
Astrometry
Radial velocity (Rv)+17±2[5] km/s
Proper motion (μ) RA: +29.636 mas/yr[2]
Dec.: −24.650 mas/yr[2]
Parallax (π)7.0519±0.134 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.38[1]
Details
A
MassScript error: No such module "val".[6] Template:Solar mass
Radius3[7] Template:Solar radius
Luminosity301[6] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
Temperature13,121[6] K
Rotational velocity (v sin i)165[6] km/s
AgeScript error: No such module "val".[8] Myr
B
Mass1.0–1.2[8] Template:Solar mass
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]−0.5[8] dex
Rotational velocity (v sin i)5 km/s
Other designations
Template:Odlist[9]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Sigma Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from σ Arietis, and abbreviated Sigma Ari or σ Ari. This star has an apparent visual magnitude of +5.52,[3] which is bright enough for the star to be seen with the naked eye from dark suburban skies. The star is located at a distance of approximately Script error: No such module "convert". from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +17 km/s.[5] On November 20, 1952, it was observed being occulted by the planet Jupiter.[10]

Sigma Arietis is a B-type main sequence star with a stellar classification of B7 V.[4] This is a large star with three[7] times the radius of the Sun and 3.8[6] times the Sun's mass. It shines around 301[6] times as brightly as the Sun, with this energy being radiated into space from its outer atmosphere at an effective temperature of 13,121 K.[6] It is this heat that gives the star the blue-white hue of a B-type star. Sigma Arietis is spinning at a rapid clip, with a projected rotational velocity of 165 km/s.[6] It is about 36[8] million years old and is a probable member of the Cas-Tau OB association of stars that share a common motion through space.[11]

In 2016, a stellar companion was reported based on observations using adaptive optics with the Gemini North Telescope. This object has a mass equal to or slightly greater than the Sun. It has an effective temperature of 5,524 K.[8]

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ a b Template:Cite XHIP
  2. ↑ a b c d 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 Script error: No such module "citation/CS1".
  6. ↑ a b c d e f g h Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ a b c d e f g Script error: No such module "citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".

Script error: No such module "Check for unknown parameters".

External links

Template:Stars of Aries

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Sigma_Arietis&oldid=2005784"