Beta Caeli

Beta Caeli
Location of β Caeli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Caelum
Right ascension 04h 42m 03.48029s[1]
Declination −37° 08′ 39.4641″[1]
Apparent magnitude (V) 5.04[2]
Characteristics
Spectral type F3 V[3] or F3 IV[4]
U−B color index +0.01[2]
B−V color index +0.38[2]
Astrometry
Radial velocity (Rv)28.8±0.8[4] km/s
Proper motion (μ) RA: +46.59[1] mas/yr
Dec.: +193.56[1] mas/yr
Parallax (π)34.88 ± 0.42 mas[1]
Distance94 ± 1 ly
(28.7 ± 0.3 pc)
Absolute magnitude (MV)+2.64[5]
Details
β Cae A
Mass1.32[6] M☉
Radius1.3[7] R☉
Surface gravity (log g)4.09[6] cgs
Temperature6,763±230[6] K
Metallicity [Fe/H]−0.12[3] dex
Rotational velocity (v sin i)97.5±4.9[5] km/s
Age1.753[6] Gyr
β Cae B
Mass0.19[8] M☉
Other designations
β Cae, CD−37° 1867, FK5 1130, GJ 176.1, HD 29992, HIP 21861, HR 1503, SAO 195239[9]
Database references
SIMBADdata

Beta Caeli (β Caeli, abbreviated to β Cae) is the Bayer designation for a star in the southern constellation of Caelum. It is a dim star but visible to the naked eye, having an apparent visual magnitude of 5.04.[2] Based upon an annual parallax shift of 4.88 mas as seen from Earth,[1] it is located 94 light years from the Sun. The star is moving away from the Sun with a radial velocity of +28.8 km/s.[4]

This is a probable single-lined spectroscopic binary star system.[10] The visible component has a stellar classification of F3 V[3] or F3 IV,[4] indicating it is either an F-type main-sequence star or a somewhat more evolved subgiant star, respectively. It has an estimated 1.3[6] times the mass of the Sun and about 1.3[7] times the Sun's radius. The star is 1.75[6] billion years old and has a high rate of spin with a projected rotational velocity of around 97.5 km/s.[5]

The companion is likely to be a low-mass (~0.2 M☉) star orbiting about 5 AU from the primary.[11] This object may be the source of the X-ray emission coming from the same location.[10]

  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 d Cite error: The named reference Cousins1973 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Torres2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference AmmlerVonEiff2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  8. ^ García, Luciano H.; Petrucci, R.; Jofré, E.; Gómez, M. (2022). "High-contrast imaging of HD 29992 and HD 196385 with the Gemini Planet Imager". Monthly Notices of the Royal Astronomical Society. 515 (4): 4999–5008. doi:10.1093/mnras/stac1929.
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Borginet2016 was invoked but never defined (see the help page).
  11. ^ García, Luciano H.; Petrucci, R.; Jofré, E.; Gómez, M. (2022), High-contrast imaging of HD 29992 and HD 196385 with GPI, arXiv:2207.07435