54 Eridani

54 Eridani

A light curve for DM Eridani, plotted from data published by Tabur et al. (2009)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 04h 40m 26.51159s[2]
Declination −19° 40′ 17.3723″[2]
Apparent magnitude (V) 4.32[3]
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M3/4 III[5]
U−B color index +1.80[6]
B−V color index 1.599±0.021[3]
Variable type SRb[7]
Astrometry
Radial velocity (Rv)−32.9±0.8[3] km/s
Proper motion (μ) RA: +29.13[8] mas/yr
Dec.: −96.42[8] mas/yr
Parallax (π)8.2063 ± 0.2709 mas[2]
Distance400 ± 10 ly
(122 ± 4 pc)
Absolute magnitude (MV)−0.93[3]
Details
Radius69+12
−6[2] R☉
Luminosity1,021+33
−38[2] L☉
Temperature3,915+190
−293[2] K
Other designations
DM Eridani, BD−19°988, GC 5695, HD 29755, HIP 21763, HR 1496, SAO 149818, WDS J04404-1940[9]
Database references
SIMBADdata

54 Eridani is a suspected astrometric binary[10] star system located around 400 light years from the Sun in the equatorial constellation of Eridanus. It is visible to the naked eye as a faint, reddish hued star with a baseline apparent visual magnitude of 4.32.[3] The object is moving closer to the Earth with a heliocentric radial velocity of −33 km/s.[3]

The visible component is an aging red giant star, currently on the asymptotic giant branch,[4] with a stellar classification of M3/4 III.[5] It is a semiregular variable star of subtype SRb, ranging in magnitude from 4.28 down to 4.36.[7] The star has pulsation periods of 18.8 and 45.5 days, each with an amplitude of 0.019 in magnitude.[1] With the hydrogen at its core exhausted, the star has expanded to around 69[2] times the Sun's radius and it is radiating 1,021[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,915 K.[2]

It was the second-brightest star in the obsolete constellation of Sceptrum Brandenburgicum after 53 Eridani.

  1. ^ a b Cite error: The named reference Tabur2009 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference vanLeeuwen2007 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).