Eta Phoenicis

Eta Phoenicis (η Phe) is a class A0IV[2] (white subgiant) star in the constellation Phoenix. Its apparent magnitude is 4.36[2] and it is approximately 246 light years away based on parallax.[1]

η Phoenicis
Location of η Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension  00h 43m 21.23841s[1]
Declination −57° 27′ 47.0073″[1]
Apparent magnitude (V) 4.36[2]
Characteristics
Spectral type A0IV[2]
U−B color index -0.02[3]
B−V color index +0.00[3]
Astrometry
Radial velocity (Rv)+7.70[4] km/s
Proper motion (μ) RA: -5.07[1] mas/yr
Dec.: +16.51[1] mas/yr
Parallax (π)13.24 ± 0.34[1] mas
Distance246 ± 6 ly
(76 ± 2 pc)
Absolute magnitude (MV)-0.03[2]
Details
Mass2.93[5] M☉
Luminosity120[5] L☉
Surface gravity (log g)3.85[6] cgs
Temperature9,822[6] K
Metallicity [Fe/H]0.00[7] dex
Rotational velocity (v sin i)124[5] km/s
Other designations
CCDM J00434-5728A, FK5 23, GC 866, HIP 3405, HR 191, HD 4150, SAO 232162, WDS J00434-5728A
Database references
SIMBADdata

Eta Phoenicis has two reported companions; in addition to a distant secondary, B, at magnitude 11.5 and separation 20", the primary has a reported companion Ab with an estimated separation of 6.8 AU, a period slightly longer than 10 years, a magnitude of 8.5, and a spectral type around G5V.[8][9] The primary is surrounded by an orbiting debris disk.[10]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Vizier catalog entry
  6. David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. Vizier catalog entry
  7. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. Vizier catalog entry
  8. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
  9. Marion, L.; Absil, O.; Ertel, S.; Le Bouquin, J.-B.; Augereau, J.-C.; Blind, N.; Defrère, D.; Lebreton, J.; Milli, J. (2014). "Searching for faint companions with VLTI/PIONIER". Astronomy & Astrophysics. 570: A127. arXiv:1409.6105. Bibcode:2014A&A...570A.127M. doi:10.1051/0004-6361/201424780.
  10. Marion, L.; et al. (October 2014), "Searching for faint companions with VLTI/PIONIER. II. 92 main sequence stars from the Exozodi survey", Astronomy & Astrophysics, 570: 12, arXiv:1409.6105, Bibcode:2014A&A...570A.127M, doi:10.1051/0004-6361/201424780, A127.


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