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45 Eridani

45 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 04h 31m 52.66831s[1]
Declination −00° 02′ 38.4407″[1]
Apparent magnitude (V) 4.91[2]
Characteristics
Evolutionary stage giant
Spectral type K0/1 III[3]
U−B color index +1.41[4]
B−V color index +1.32±0.04[2]
Astrometry
Radial velocity (Rv)+15.22±0.35[1] km/s
Proper motion (μ) RA: −1.149[1] mas/yr
Dec.: −7.655[1] mas/yr
Parallax (π)4.6579 ± 0.2082 mas[1]
Distance700 ± 30 ly
(215 ± 10 pc)
Absolute magnitude (MV)−1.59[2]
Details
Radius50.06±1.73[1] R☉
Luminosity787.9±40.1[1] L☉
Surface gravity (log g)2.0[5] cgs
Temperature4322+58
−57[1] K
Metallicity [Fe/H]−0.17[5] dex
Other designations
45 Eri, BD−00°713, GC 5528, HD 28749, HIP 21139, HR 1437, SAO 131270[6]
Database references
SIMBADdata

45 Eridani is a single[7] star located around 700 light years away from the Sun in the equatorial constellation of Eridanus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.91.[2] This body is moving away from the Earth with a heliocentric radial velocity of +15 km/s.[1]

The stellar classification for this star is K0/1 III,[3] which indicates this is an aging K-type giant star that has exhausted the hydrogen supply at its core and expanded. It has reached 50[1] times the Sun's radius and is radiating 788[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,322 K.[1]

  1. ^ a b c d e f g h i j k l m Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference McWilliam1990 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

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