X Caeli

This article is about γ2 Caeli. For other stars with this Bayer designation, see γ Caeli.
X Caeli

The constellation Caelum near the horizon, with the four main stars marked by a line
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 05h 04m 26.19316s[1]
Declination −35° 42′ 17.7574″[1]
Apparent magnitude (V) 6.28 – 6.39[2] (6.43 + 9.65)[3]
Characteristics
Spectral type F2 IV/V[4]
B−V color index 0.311±0.006[5]
Variable type δ Sct[6]
Astrometry
Radial velocity (Rv)+6.4±0.8[7] km/s
Proper motion (μ) RA: +28.39[8] mas/yr
Dec.: +41.71[8] mas/yr
Parallax (π)9.5567 ± 0.0583 mas[1]
Distance341 ± 2 ly
(104.6 ± 0.6 pc)
Absolute magnitude (MV)1.36[5]
Details
Mass1.52[9] M☉
Radius3.43±0.32[10] R☉
Luminosity23.65[5] L☉
Surface gravity (log g)3.80[9] cgs
Temperature7,227±246[9] K
Rotational velocity (v sin i)69.0±1.0[10] km/s
Age961[9] Myr
Other designations
γ2 Cae, γ2 Caeli, X Caeli, BD+27°2400, GC 6214, HD 32846, HIP 23596, HR 1653, SAO 195534, CCDM 05044-3542, WDS J05044-3542AB[11]
Database references
SIMBADdata

X Caeli, or Gamma2 Caeli, is a binary star system in the southern constellation of Caelum. It is barely visible to the naked eye with an apparent visual magnitude of 6.32.[5] based upon an annual parallax shift of 9.6 mas,[1] it is located 341 light-years from Earth. The system is moving further away with a heliocentric radial velocity of +6 km/s.[7]

A visual-band light curve for X Caeli, adapted from Mantegazza and Poretti (1996)[12]

The yellow-white-hued primary, component A, has an apparent magnitude of +6.32 and stellar classification of F2 IV/V,[4] showing mixed traits of an F-type main-sequence star and a subgiant. It is classified as a Delta Scuti-type variable star and its brightness varies from magnitude +6.28 to +6.39 with a period of 3.25 hours. A 2000 observing campaign identified at least six independent pulsation modes for this variation.[10] The companion star, component B, has an apparent magnitude of +9.65 and, as of 2000, is at an angular separation of 0.890″ along a position angle of 183°.[3]

  1. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference vsx was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Fabricius2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference david2015 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Mantegazza2000 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mantegazza1996 was invoked but never defined (see the help page).