Phi1 Ceti

For other stars with this Bayer designation, see φ Ceti.
Phi1 Ceti
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cetus
Right ascension 00h 44m 11.40013s[1]
Declination −10° 36′ 34.3816″[1]
Apparent magnitude (V) 4.75[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.83[2]
B−V color index +1.00[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)+0.33±0.63[5] km/s
Proper motion (μ) RA: −8.96[1] mas/yr
Dec.: −113.82[1] mas/yr
Parallax (π)13.96 ± 0.24 mas[1]
Distance234 ± 4 ly
(72 ± 1 pc)
Absolute magnitude (MV)0.732[6]
Details[5]
Mass1.60[7] M☉
Radius11 R☉
Luminosity54 L☉
Surface gravity (log g)2.7 cgs
Temperature4,775±5 K
Metallicity [Fe/H]−0.16 dex
Rotational velocity (v sin i)2.3 km/s
Age2.21[7] Gyr
Other designations
φ1 Cet, 17 Ceti, NSV 278, BD−11°128, FK5 2048, HD 4188, HIP 3455, HR 194, SAO 147423[8]
Database references
SIMBADdata

Phi1 Ceti is a single[9] star located in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of +4.78. Based upon an annual parallax shift of 13.96 mas,[1] it is located about 234 light years from the Sun. Based upon the motion of this star through space, Phi1 Ceti is a probable member of the proposed Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around 2.7±0.5 billion years. They may be former members of a dissolved open cluster.[10]

At an age of about 2.21[7] billion years, Phi1 Ceti is an evolved red clump[11] giant star with a stellar classification of K0 III.[3] It is presently on the horizontal branch and is generating energy through the nuclear fusion of helium at its core. The star is suspected of variability; it has been measured to vary between magnitudes 4.75 and 4.78.[4] It has 1.6[7] times the mass of the Sun and has expanded to 11 times the Sun's radius. The star is radiating 54 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,775 K.[5]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference AAVSO was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Liu2007 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Bubar2010 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Puzeras2010 was invoked but never defined (see the help page).