27 Cancri

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Template:Short description

27 Cancri
File:BPCncLightCurve.png
A light curve for 27 Cancri, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.56[3]
Characteristics
Evolutionary stage Asymptotic giant branch[4]
Spectral type M3 IIIa[5]
B−V Template:Engvar Script error: No such module "val".[3]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: −19.760[2] mas/yr
Dec.: −104.664[2] mas/yr
Parallax (π)3.3094±0.3176 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.62[3]
Details
Radius119[2] Template:Solar radius
LuminosityScript error: No such module "val".[7] Template:Solar luminosity
Surface gravity (log g)1.00[7] cgs
Temperature3,574[7] K
Metallicity [Fe/H]0.00[7] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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27 Cancri is a single[9] star in the zodiac constellation of Cancer, located around 990 light-years away from the Sun.[2] It is visible to the naked eye as a faint, red-hued star with a typical apparent visual magnitude of around +5.56.[3] The star is moving closer to the Earth with a heliocentric radial velocity of −8.3 km/s.[6] It is a member of the Arcturus stream, a group of stars with high proper motion and metal-poor properties thought to be the remnants of a small galaxy consumed by the Milky Way.[10]

The variability of the brightness of 27 Cancri was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory.[11] It was given its variable star designation, BP Cancri, in 1977.[12]

This is an aging red giant with a stellar classification of M3 IIIa,[5] currently on the asymptotic giant branch.[4] It is classified as a semiregular variable star of type SRb and its brightness varies from magnitude +5.41 to +5.75 with a period of 40 days.[13] The star is radiating around 2,455[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,574 K.[7]

References

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  2. ↑ a b c d e f g Template:Cite Gaia DR2
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  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b c d e f Script error: No such module "citation/CS1".
  8. ↑ Template:Cite simbad
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  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 Cancer

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