17 Eridani

Not to be confused with ν (Nu) Eridani.
17 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 03h 30m 37.05823s[1]
Declination −05° 04′ 30.5239″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9 III[4] or B9Vs[5]
B−V color index −0.092±0.008[2]
Astrometry
Radial velocity (Rv)+15.0±4.2[2] km/s
Proper motion (μ) RA: 14.23[1] mas/yr
Dec.: 7.27[1] mas/yr
Parallax (π)8.07 ± 0.20 mas[1]
Distance400 ± 10 ly
(124 ± 3 pc)
Absolute magnitude (MV)−0.72[2]
Details
Mass3.55±0.04[3] M☉
Radius3.2[6] R☉
Luminosity267.9+15.2
−14.4[3] L☉
Surface gravity (log g)3.603±0.017[7] cgs
Temperature11,143±51[3] K
Rotational velocity (v sin i)86[3] km/s
Age178+10
−9[8] Myr
Other designations
v Eri, 17 Eri, BD−05°674, HD 21790, HIP 16341, HR 1070, SAO 130528[9]
Database references
SIMBADdata

17 Eridani is a single[10] star in the equatorial constellation of Eridanus. It has the Bayer designation v Eridani (not to be confused with ν (nu) Eri), while 17 Eridani is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.74.[2] It is moving further from the Earth with a heliocentric radial velocity of around +15 km/s.[2]

Houk and Swift (1999) found a stellar classification of B9 III[4] for this star, while Cowley et al. (1969) show B9 Vs.[5] Stellar models suggest this is a main-sequence star,[3] which indicates it is generating energy through hydrogen fusion at its core. It is about 178[8] million years old with 3.55[3] times the mass of the Sun and around 3.2[6] times the size of the Sun. The star is radiating 268[3] times the Sun's luminosity from its photosphere at an effective temperature of 11,143 K.[3] These coordinates are a source for X-ray emission, which may be coming from an unresolved companion.[7]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Huang2010 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Hubrig2001 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Simbad 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).