Alpha Cancri

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Template:Short description

α Cancri
Template:Location mark
α Cancri, circled, is the bottom left star in the "crab".
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) Script error: No such module "val".[3]
Characteristics
Spectral type kA7VmF0/2III/IVSr[4]
U−B Template:Engvar +0.15[5]
B−V Template:Engvar +0.14[5]
R−I Template:Engvar +0.04[5]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: 42.181 mas/yr[2]
Dec.: −31.160 mas/yr[2]
Parallax (π)18.3304±0.3216 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.46[1]
Details
A
Mass2.10[7] Template:Solar mass
Radius3.655[8] Template:Solar radius
Luminosity49[8] Template:Solar luminosity
Surface gravity (log g)3.73[9] cgs
Temperature7,943[9] K
Rotational velocity (v sin i)75[10] km/s
B
Mass0.38[7] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata
B

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Alpha Cancri is a star system in the northern constellation of Cancer. Its name is a Bayer designation that is Latinized from α Cancri, and abbreviated Alpha Cnc or α Cnc. The primary component has the proper name Acubens, pronounced Template:IPAc-en.[12] It forms a fourth-magnitude star with an apparent magnitude of 4.20, making it barely visible to the naked eye under good viewing conditions. Based on parallax measurements, it is located at a distance of Script error: No such module "convert". from the Sun, but is drifting closer with a radial velocity of −12 km/s.[6] Since it is near the ecliptic, it can be occulted by the Moon.[13]

Properties

The primary component, α Cancri A, has a stellar classification of kA7VmF0/2III/IVSr, indicating an Am star with calcium K-lines similar to an A7 main sequence star and hydrogen lines more like an F0 giant or subgiant star. It is a white A-type main-sequence star with an apparent magnitude of +4.26. The star has 2.10[7] times the mass of the Sun and 3.7[8] times the Sun's radius. It has a high rate of spin, showing a projected rotational velocity of 75 km/s.[10] The star is radiating 49 times the luminosity of the Sun from its photosphere at an effective temperature of 7,943 K.[9]

Its companion, α Cancri B, is an eleventh-magnitude star. In the year 1836, its position angle was observed at 325 degrees with a separation from the main star α Cancri A of 11.3 arcseconds.[14][15] α Cancri A may itself be a close binary, consisting of two stars with similar brightness and a separation of 0.1 arcsecond, though this is questioned.[5] Indeed, a light curve generated during a 2014 lunar occultation failed to demonstrate a close companion.[13]

Nomenclature

α Cancri (Latinised to Alpha Cancri) is the star's Bayer designation.

The traditional name Acubens (Açubens) is derived from the Arabic Script error: No such module "Lang". Script error: No such module "Lang"., 'the claws'.[16] A second name, Sertan Template:IPAc-en, derives from the Arabic al-saraṭān, 'the crab'. The International Astronomical Union Working Group on Star Names (WGSN) choose 'Acubens' as the proper name for the primary component of this star.[17]

In modern culture

USS Acubens (AKS-5) was a United States Navy ship.

References

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  1. ↑ a b Template:Cite XHIP
  2. ↑ a b c d Template:Cite Gaia EDR3
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "Citation/CS1".
  5. ↑ a b c d Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b c Script error: No such module "Citation/CS1".
  8. ↑ a b c Script error: No such module "Citation/CS1". Acubens' database entry at VizieR.
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".

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External links

  • Script error: No such module "citation/CS1".

Template:Sky Template:Stars of Cancer

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