Eta2 Pictoris

For other stars with this Bayer designation, see η Pictoris.
Eta2 Pictoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pictor
Right ascension 05h 04m 58.01433s[1]
Declination −49° 34′ 40.2034″[1]
Apparent magnitude (V) 5.02[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.82[2]
B−V color index +1.51[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−5.0±7.4[5] km/s
Proper motion (μ) RA: +68.538[1] mas/yr
Dec.: −2.186[1] mas/yr
Parallax (π)7.8033 ± 0.1351 mas[1]
Distance418 ± 7 ly
(128 ± 2 pc)
Absolute magnitude (MV)−1.2[6]
Details
Radius40.56+0.59
−2.38[1] R☉
Luminosity362.6±7.4[1] L☉
Temperature3,955+121
−28[1] K
Other designations
η2 Pic, NSV 1827, CD−49°1562, FK5 187, GC 6234, HD 33042, HIP 23649, HR 1663, SAO 217164[7]
Database references
SIMBADdata

η2 Pictoris, Latinised as Eta2 Pictoris, is a solitary[8] star in the southern constellation of Pictor. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.02.[2] With an annual parallax shift of 7.8 mas as seen from the Earth,[1] it is located around 418 light years from the Sun. It is a member of the HR 1614 moving group of stars that share a common motion through space.[6]

This is an evolved K-type giant star with a stellar classification of K5 III,[3] having exhausted the supply of hydrogen at its core, then cooled and expanded off the main sequence. At present it has 41[1] times the girth of the Sun. It is radiating an estimated 363.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,136 K.[9] This is a member of the old disk population and is a suspected variable star.[10]

  1. ^ a b c d e f g h i j 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 Cousins1969 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Eggen1996 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggen1973 was invoked but never defined (see the help page).