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Tau7 Eridani information


τ7 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 03h 47m 39.65058s[1]
Declination −23° 52′ 28.8352″[1]
Apparent magnitude (V) 5.235[2]
Characteristics
Spectral type A3 Vs[3]
U−B color index +0.168[2]
B−V color index +0.067[2]
Astrometry
Radial velocity (Rv)28.4±0.5[4] km/s
Proper motion (μ) RA: +47.46[1] mas/yr
Dec.: +49.10[1] mas/yr
Parallax (π)13.00 ± 0.28 mas[1]
Distance251 ± 5 ly
(77 ± 2 pc)
Absolute magnitude (MV)+0.81[5]
Details
τ7 Eri A
Mass2.03[6] M
Luminosity37.6[7] L
Surface gravity (log g)3.86±0.2[8] cgs
Temperature8,740±200[8] K
Rotational velocity (v sin i)18[8] km/s
Age387[6] Myr
Other designations
τ7 Eridani, τ7 Eri, 28 Eridani, CD−24° 1877, HD 23878, HIP 17717, HR 1181, SAO 168836.[9]
Database references
SIMBADdata

Tau7 Eridani is a solitary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 5.235.[2] Using the parallax method, the distance to this star can be estimated as around 251 light years.[1]

This is an A-type main sequence star with a stellar classification of A3 Vs,[3] where the 's' indicates it has narrow absorption lines. It may be a chemically peculiar Am star, which means it displays unusual abundances of certain elements in its surface layers. Tau7 Eridani appears to be a low amplitude variable that displays slight fluctuations in luminosity over a period of 7.17 days. It is slowly rotating with a projected rotational velocity of 18 km/s,[8] and is around 387 million years old.[6]

  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 GutierrezMoreno1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference DeBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Khalack2015 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).

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