Eta1 Pictoris

η1 Pictoris, Latinised as Eta1 Pictoris, is a solitary[10] star in the southern constellation of Pictor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.37.[2] Based upon an annual parallax shift of 38.35 mas as seen from the Earth,[1] the system is located 85 light years from the Sun. The star made its closest approach to the Sun about 1.1 million years ago with a perihelion passage of about 24 ly (7.5 pc).[11]

For other stars with this Bayer designation, see η Pictoris.
Eta1 Pictoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pictor
Right ascension 05h 02m 48.68641s[1]
Declination −49° 09′ 05.0644″[1]
Apparent magnitude (V) +5.37[2]
Characteristics
Spectral type F5 V[3]
U−B color index −0.01[2]
B−V color index +0.43[2]
Astrometry
Radial velocity (Rv)21.4±2.8[4] km/s
Proper motion (μ) RA: −43.67[1] mas/yr
Dec.: +27.37[1] mas/yr
Parallax (π)38.35 ± 0.18[1] mas
Distance85.0 ± 0.4 ly
(26.1 ± 0.1 pc)
Absolute magnitude (MV)3.28[5]
Details
Mass1.37[6] M☉
Radius1.1[7] R☉
Luminosity3.69[8] L☉
Surface gravity (log g)4.17[6] cgs
Temperature6,631±225[6] K
Metallicity [Fe/H]−0.05[3] dex
Rotational velocity (v sin i)22.7±1.1[5] km/s
Age2.15[6] Gyr
Other designations
η1 Pic, CD−49° 1541, GJ 187, HD 32743, HIP 23482, HR 1649, SAO 217140[9]
Database references
SIMBADdata

This is an F-type main sequence star with a stellar classification of F5 V[3] and it is chromospherically active.[3] It is an estimated 2.15[6] billion years old and is spinning with a projected rotational velocity of 22.7 km/s.[5] The star has 1.4[6] times the mass of the Sun and about 1.1[7] times the Sun's radius. It is radiating 3.7[8] times the Sun's luminosity from its photosphere at an effective temperature of roughly 6,631 K.[6]

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.
  2. Cousins, A. W. J. (1973), "UBV photometry of some southern stars", Monthly Notes of the Astronomical Society of Southern Africa, 32: 11, Bibcode:1973MNSSA..32...11C.
  3. Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. De Bruijne, J. H. J.; Eilers, A.-C. (2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: A61, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219.
  5. Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116.
  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.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  9. "eta01 Pic -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-22.
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  11. Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, A35.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.