Delta Eridani

δ Eridani / Rana
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]
Astrometry
Radial velocity (Rv)−6.28±0.09[5] km/s
Proper motion (μ) RA: −93.16[1] mas/yr
Dec.: +743.64[1] mas/yr
Parallax (π)110.61 ± 0.29 mas[1]
Distance29.49 ± 0.08 ly
(9.04 ± 0.02 pc)
Absolute magnitude (MV)3.77[6]
Details[7]
Mass1.33±0.07[8] M☉
Radius2.35±0.01 R☉
Luminosity3.17±0.09 L☉
Surface gravity (log g)3.66±0.1 cgs
Temperature5,027±48 K
Metallicity [Fe/H]+0.07±0.03 dex
Rotational velocity (v sin i)0.7±0.6[8] km/s
Age6.194[9] Gyr
Other designations
Rana, δ Eridani, 23 Eridani, del Eri, NSV 1246, BD−10°728, GJ 150, HD 23249, HIP 17378, HR 1136, SAO 130686, LHS 1581[10]
Database references
SIMBADdata

Delta Eridani, which is Latinized from δ Eridani, is the fifth-brightest star in the 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,[2] although subsequent observations did not bear this out.[11] It is relatively near to the Sun, with a distance of about 29.5 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:[12] 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.[13]

  1. ^ a b c d e f Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Spinrad_Taylor_1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Jofré_et_al_2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference aaa361_614 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Rains2020 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference mnras405_3_1907 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Thévenin_et_al_2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eaton_Poe_1985 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Becvar was invoked but never defined (see the help page).
  13. ^ "Naming Stars".