Upsilon1 Cassiopeiae

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υ1 Cassiopeiae
Template:Location mark
Location of υ1 Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cassiopeia[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.82[3]
Characteristics
Evolutionary stage red clump[4]
Spectral type K2 III[5]
U−B Template:Engvar +1.25[3]
B−V Template:Engvar +1.21[3]
Astrometry
Radial velocity (Rv)−23.57[6] km/s
Proper motion (μ) RA: Script error: No such module "val".[2] mas/yr
Dec.: Script error: No such module "val".[2] mas/yr
Parallax (π)9.93±0.49 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.644[6]
Details
Mass1.39[7] Template:Solar mass
Radius21[8] Template:Solar radius
Luminosity174[7] Template:Solar luminosity
Surface gravity (log g)1.76[6] cgs
TemperatureScript error: No such module "val".[7] K
Metallicity [Fe/H]−0.25[6] dex
Rotational velocity (v sin i)1.1[9] km/s
Age4.75[7] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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File:Upsilon Cassiopeiae.jpg
υ1 Cassiopeiae is the bright star in the lower right. The bright star in the upper left is υ2 Cassiopeiae.

Upsilon1 Cassiopeiae (υ1 Cassiopeiae) is an astrometric binary[11] star system in the northern constellation of Cassiopeia. It is visible to the naked eye with an apparent visual magnitude of 4.82.[3] Based upon an annual parallax shift of 9.93 mas as seen from Earth,[2] this system is located about 330 light years from the Sun.

The visible component is an evolved K-type giant star with a stellar classification of K2 III.[5] With an estimated age of 4.75 billion years,[7] it is a red clump star that is generating energy through the fusion of helium at its core.[4] The measured angular diameter, after correction for limb darkening, is Script error: No such module "val"..[12] At the estimated distance of the star, this yields a physical size of about 21 times the radius of the Sun.[8] It has 1.39 times the mass of the Sun and is radiating 174 times the Sun's luminosity from its expanded photosphere at an effective temperature of 4,422 K.[7]

There is a magnitude 12.50 visual companion at an angular separation of 17.80 arc seconds along a position angle of 61°, as of 2003. A more distant magnitude 12.89 companion lies at a separation of 93.30 arc seconds along a position angle of 125°, as measured in 2003. Neither star appears to be physically associated with υ1 Cas.[13]

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Script error: No such module "citation/CS1".
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".Script error: No such module "Unsubst".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b c d Script error: No such module "citation/CS1".
  7. ↑ a b c d e f Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1". The radius (R*) is given by:
    2⋅R*=(101⋅1.97⋅10−3) AU0.0046491 AU/R⨀≈42.8⋅R⨀
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Cassiopeia

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