Delta Eridani

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δ Eridani
Location of δ Eridani (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 03h 43m 14.90088s[1]
Declination –09° 45′ 48.2084″[1]
Apparent magnitude (V) 3.51 - 3.56[2]
Characteristics
Evolutionary stage Subgiant
Spectral type K0 IV[3]
U−B color index +0.69[4]
B−V color index +0.92[4]
Variable type Suspected RS CVn[2]
Distance
29.49 ± 0.08 ly
(9.04 ± 0.02 pc)
Absolute magnitude (MV)3.77[6]
Details
Gyr
LHS 1581[9]
Database references
SIMBADdata

Delta Eridani, which is Latinized from δ Eridani, is a star in the equatorial constellation of Eridanus.

The star is visible to the naked eye and has been observed to vary slightly in brightness between magnitudes 3.51 and 3.56,

light years as determined from parallax.[1] The star is drifting closer with a radial velocity of −6 km/s.[5]

Delta Eridani is sometimes called Rana:[11] Rana means "the frog" in Latin, but derivation of this name is uncertain. The name was approved by the International Astronomic Union on 4 April 2022.[12]

Structure

The

subgiant stage and about to transition into a giant. It is an estimated six[8] billion years old with 33% more mass than the Sun. The star has 2.3 times the girth of the Sun and is radiating three times the Sun's luminosity from its photosphere at an effective temperature of 4,986 K.[7]

Delta Eridani is catalogued as a suspected

projected rotational velocity of under 1 km/s and the lack of radial velocity variation suggests that this putative variable is being viewed from nearly pole-on. However, an examination of the star using interferometry does not detect the presence of a companion at the expected distance.[8]

Chinese name

In

Chinese name for δ Eridani itself is 天苑三 (Tiān Yuàn sān, English: the Third Star of Celestial Meadows.)[15]

See also

References

  1. ^ a b c d e f van Leeuwen, F. (2007). "HIP 17378". Hipparcos, the New Reduction. Retrieved 2009-12-11.
  2. ^
    S2CID 125853869
    .
  3. ^
    doi:10.1086/150154
    .
  4. ^
    Bibcode:1986EgUBV........0M
    .
  5. ^
    S2CID 53666931
    .
  6. Bibcode:2000A&A...361..614P
    .
  7. ^
    S2CID 118495267
    .
  8. ^
    S2CID 118169489
    .
  9. ^ "Del Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-11.
  10. Bibcode:1985IBVS.2712....1E
    .
  11. ^ Bečvář, A. (1951). Atlas Coeli Skalnaté Pleso II - Katalog 1950.0. Přírodovědecké Vydavatelstrí. p. 277. Retrieved 27 May 2019.
  12. ^ "Naming Stars".
  13. Bibcode:1983IBVS.2259....1F
    .
  14. ISBN 978-986-7332-25-7
    .
  15. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.

External links

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