Mu1 Cancri

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Template:Other stars by Bayer designation

Mu1 Cancri
File:BLCncLightCurve.png
A visual band light curve for BL Cancri, plotted from data presented by Tabur et al. (2009)[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer[2]
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) +5.99[4] (Script error: No such module "val".)[5]
Characteristics
Evolutionary stage Asymptotic giant branch[6]
Spectral type M3 III[7]
B−V Template:Engvar +1.66[4]
Variable type Lb[7]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[8] km/s
Proper motion (μ) RA: −5.831 mas/yr[3]
Dec.: −9.488 mas/yr[3]
Parallax (π)5.4293±0.1351 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.79[2]
Details
RadiusScript error: No such module "val".[9] Template:Solar radius
LuminosityScript error: No such module "val".[9] Template:Solar luminosity
Surface gravity (log g)0.441[10] cgs
TemperatureScript error: No such module "val".[9] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Mu1 Cancri, Latinised from μ1 Cancri, is a variable star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from μ1 Cancri, and abbreviated Mu1 Cnc or μ1 Cnc. The "1" in the name is because (from Earth) it appears to be close to 10 Cancri, or Mu2 Cancri. It is also known by the variable star designation BL Cancri, or BL Cnc. This star is dimly visible to the naked eye with an apparent visual magnitude that ranges from 5.87 down to 6.07.[5] The position of the star near the ecliptic means it is subject to lunar occultations.[12]

Parallax measurements put this star at about Script error: No such module "convert". from the Sun.[3] At that distance, the visual magnitude is diminished by an extinction factor of 0.28 due to interstellar dust.[13] It is drifting further away with a line of sight velocity of +30 km/s.[8]

The star Mu1 Cancri is an evolved red giant currently on the asymptotic giant branch[6] with a stellar classification of M3 III.[7] The lack of technetium-99 in the spectrum indicates it has not yet gone through third dredge-up.[14] The star has expanded to 57 times the radius of the Sun and it is radiating 565 times the Sun's luminosity from its enlarged photosphere at an effective temperature of Script error: No such module "val"..[9]

In 1967, Olin J. Eggen announced his discovery that Mu1 Cancri is a variable star.[15] It was given its variable star designation in 1972.[16] It is a slow irregular variable[7] with thermal pulsation periods of 22.6, 37.8 and 203.7 days.[1]

References

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  1. ↑ a b Script error: No such module "citation/CS1".
  2. ↑ a b Template:Cite XHIP
  3. ↑ a b c d e Template:Cite Gaia DR3
  4. ↑ a b Script error: No such module "citation/CS1".
  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 Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ a b c d Template:Cite Gaia DR2
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1". See CncBL in Table 2.
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Cancer

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