Pi Eridani

π Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 03h 46m 08.53581s[1]
Declination −12° 06′ 05.7282″[1]
Apparent magnitude (V) 4.40[2] (4.38 - 4.44[3])
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M1 III[5]
U−B color index +1.96[2]
B−V color index +1.61[2]
Variable type Lb?[3]
Astrometry
Radial velocity (Rv)45.2±0.1[6] km/s
Proper motion (μ) RA: +55.98[1] mas/yr
Dec.: +59.28[1] mas/yr
Parallax (π)6.78 ± 0.53 mas[1]
Distance480 ± 40 ly
(150 ± 10 pc)
Absolute magnitude (MV)−1.40[7]
Details
Radius77[8] R☉
Luminosity1,123[9] L☉
Temperature3,841[9] K
Other designations
π Eridani, π Eri, 26 Eridani, BD-12° 707, HD 23614, HIP 17593, HR 1162, SAO 149158.[10]
Database references
SIMBADdata

Pi Eridani, Latinized from π Eridani, is a star in the constellation Eridanus. It has an apparent visual magnitude of 4.40,[2] which is bright enough to be seen on a dark, clear night. Based upon parallax measurements, it is located roughly 480 light years from the Sun.

This is an evolved red giant star with a stellar classification of M1 III,[5] and is currently on the asymptotic giant branch.[4] It is a slow irregular variable type LB that can increase in magnitude up to 4.38.[3][11] The measured angular diameter of this star is 4.8±0.5 mas.[12] At the estimated distance of Pi Eridani, this yields a physical size of about 77 times the radius of the Sun.[8] It shines with 1,123[9] times the luminosity of the Sun from an outer atmosphere at an effective temperature of 3,841 K.[9]

  1. ^ a b c d e 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 Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference cgcvs2007 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 houk1988 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Mcdonald2012 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 Mennessie2001 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).