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F Eridani

HD 24071 and HD 24072
Location of HD 24160 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
HD 24072
Right ascension 03h 48m 35.87402s[1]
Declination −37° 37′ 12.5158″[1]
Apparent magnitude (V) 4.721±0.009[2]
HD 24071
Right ascension 03h 48m 35.47769s[3]
Declination −37° 37′ 19.2124″[3]
Apparent magnitude (V) 5.246±0.009[2]
Characteristics
HD 24072
Spectral type B9.5 Van[4]
HD 24071
Spectral type A1 Va[4]
Variable type suspected[5]
Astrometry
HD 24072
Proper motion (μ) RA: +81.136[1] mas/yr
Dec.: −6.795[1] mas/yr
Parallax (π)18.8093±0.2220 mas[1]
Distance173 ± 2 ly
(53.2 ± 0.6 pc)
Absolute magnitude (MV)1.194±0.190[2]
HD 24071
Proper motion (μ) RA: +63.372[3] mas/yr
Dec.: −8.121[3] mas/yr
Parallax (π)18.7976 ± 0.0582 mas[3]
Distance173.5 ± 0.5 ly
(53.2 ± 0.2 pc)
Absolute magnitude (MV)1.719±0.190[2]
Details
HD 24072
Mass2.6[6] M☉
Radius2.0[6] R☉
Luminosity35[6] L☉
Surface gravity (log g)4.26[6] cgs
Temperature10.046[6] K
Rotational velocity (v sin i)225[7] km/s
Age45±4[2] Myr
HD 24071
Mass2.1[3] M☉
Radius1.7[3] R☉
Luminosity20[3] L☉
Surface gravity (log g)4.16[3] cgs
Temperature9,503[3] K
Metallicity [Fe/H]−1.47[3] dex
Rotational velocity (v sin i)39[7] km/s
Age45±4[2] Myr
Other designations
f Eridani, CD−38 1297, HIP 17797, WDS J03486-3737
HD 24072: HR 1190, SAO 194551[8]
HD 24071: HR 1189, SAO 194550[9]
Database references
SIMBADdata
HD 24072
HD 24071

f Eridani is a binary,[10] or possibly a triple, star system in the equatorial constellation of Eridanus, consisting of stars HD 24071 and HD 24072. They share a single Hipparcos catalogue entry, HIP 17797, but have separate Bright Star Catalogue listings, HR 1189 and 1190. f Eridani is the Bayer designation of the pair.

f Eridani is visible to the naked eye as a single star with a magnitude of 4.25.[11] HD 24071 has an apparent visual magnitude of 5.25 and HD 24072 a magnitude of 4.72.[2] As of 2009, the pair had an angular separation of 8.40″ along a position angle of 216°.[12] Both stars have an annual parallax shift 18.8 mas, which provides a distance estimate to the system of 173 light years. The pair are members of the Tucana-Horologium moving group, a 45 million year old set of stars that share a common motion through space.[2]

The brighter component, HD 24072, is a B-type main-sequence star with a classification of B9.5 Van.[4] The n suffix indicates "nebulous" absorption lines which are caused by its rapid rotation. It has a projected rotational velocity of 225 km/s.[7]

HD 24071 may itself be a spectroscopic binary. The visible component is an A-type main-sequence star with a stellar classification of A1 Va.[4] It is a suspected variable star of unknown type showing an amplitude of 0.05 magnitude,[5] and is a source of X-ray emission, which may originate from a companion of class G2-5V.[13]

  1. ^ a b c d e Cite error: The named reference GaiaDR3A was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Bell2015 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Gray1987 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Adelman2000 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD_A was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD_B was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference sloan was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).
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