Iota Cassiopeiae

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Template:Short description

ι Cassiopeiae
File:Iota cassiopeiae diagram.jpg
The Bayer-designated stars in Cassiopeia. Iota Cassiopeiae is circled.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia[1]
ι Cas A
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.61[2] (4.65 / 8.48)‍[3]
ι Cas B
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.87[2]
ι Cas C
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 9.05[4] (9.14 / 11.84)‍[4]
Characteristics
U−B Template:Engvar +0.03[5]
B−V Template:Engvar +0.12[5]
ι Cas A
Spectral type A3p / G6[3]
Variable type α2 CVn[6]
ι Cas B
Spectral type F5[3]
ι Cas C
Spectral type K4 / M2[4]
U−B Template:Engvar +0.18[5]
B−V Template:Engvar +0.72[5]
Astrometry
Radial velocity (Rv)1.2 ± 2[7] km/s
Proper motion (μ) RA: -26.61[8] mas/yr
Dec.: 38.21[8] mas/yr
Parallax (π)22.22±0.08 mas[9]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val". (Aa) Script error: No such module "val". (Ab)‍[10]
Orbit[9]
Primaryι Cas Aa
Companionι Cas Ab
Period (P)Script error: No such module "val". yr
Semi-major axis (a)Script error: No such module "val".″
Eccentricity (e)Script error: No such module "val".
Inclination (i)Script error: No such module "val".°
Longitude of the node (Ω)Script error: No such module "val".°
Periastron epoch (T)B Script error: No such module "val".
Argument of periastron (ω)
(secondary)		Script error: No such module "val".°
Orbit[9]
Primaryι Cas A
Companionι Cas B
Period (P)2400 yr
Semi-major axis (a)6.50″
Eccentricity (e)0.40
Inclination (i)Script error: No such module "val".°
Longitude of the node (Ω)Script error: No such module "val".°
Periastron epoch (T)B Script error: No such module "val".
Argument of periastron (ω)
(secondary)		Script error: No such module "val".°
Details
ι Cas Aa
Mass1.98[9] Template:Solar mass
RadiusScript error: No such module "val".[11] Template:Solar radius
Luminosity24[11] Template:Solar luminosity
TemperatureScript error: No such module "val".[11] K
Rotation1.74033 d[11]
Rotational velocity (v sin i)48[11] km/s
Age100[10] Myr
ι Cas Ab
Mass0.98[9] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
ι Cas B
Mass1.28[9] Template:Solar mass
Temperature6540[4] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
ι Cas Ca
Temperature4520 ± 20[4] K
ι Cas Cb
TemperatureScript error: No such module "val".[4] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist
ι Cas A: Template:Odlist
ι Cas B: Template:Odlist
ι Cas C: Template:Odlist
Database references
SIMBADι Cas
ι Cas A
ι Cas B
ι Cas C

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Iota Cassiopeiae (ι Cas, ι Cassiopeiae) is a star system in the constellation Cassiopeia. The system has a combined apparent magnitude of about 4.5,[6] making it visible to the naked eye. Based on its parallax, it is located about 133 light-years (41 parsecs) from Earth.[8]

Components

File:IotaCasLightCurve.png
A light curve for Iota Cassiopeiae, plotted from TESS data[12]

Iota Cassiopeiae is known to be a quintuple star system. The brightest star system, ι Cassiopeiae A, contains a white-colored A-type main-sequence star with a mean apparent magnitude of +4.61.[2] The primary is itself a tighter binary star system. The two stars were resolved by adaptive optics.[3] These are designated Aa and Ab (although confusingly they may also be labeled as A and Aa, respectively).[4] The primary is classified as an Alpha2 Canum Venaticorum-type variable star and the brightness of the system varies from magnitude +4.45 to +4.53 with a period of 1.74 days,[6] because of its magnetic field.[11] The variability in brightness was first detected by Karl D. Rakos in 1962, although its spectrum was known to be variable from earlier observations.[13] The fainter companion is a G-type star with a mass of Template:Solar mass.[9] The orbital period of the system is about 49 years.[9]

ι Cassiopeiae B is a yellow-white F-type main sequence dwarf with an apparent magnitude of +6.87.[2] It orbits around ι Cassiopeiae A approximately every 2,400 years with a semi-major axis of around 6.5 arcseconds, but the orbit is not very well constrained.[9] This object may be causing Kozai–Lidov cycles in the inner orbital pair.[9]

ι Cassiopeiae C is itself another binary, designated Ca and Cb,[9] or just C and c.[4] It comprises two stars, a K-type star and an M-type star.[4] It is currently at an angular distance of about 7 arcseconds from the AB pair.[14] Since the semimajor axis of the AB orbit is about 6.5 arcseconds, the true semimajor axis of C's orbit around them is thought to be significantly larger than 7 arcseconds.[9]

References

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  4. ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
  5. ↑ a b c d Script error: No such module "Citation/CS1".
  6. ↑ a b c Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b c Script error: No such module "Citation/CS1".
  9. ↑ a b c d e f g h i j k l Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ a b c d e f Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1". (HR 707 Template:Webarchive)

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Template:Stars of Cassiopeia

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