| 词条 | Eta Leonis |
| 释义 |
| image={{Location mark |image=Leo constellation map.svg |float=center |alt= |label= |position=right |width=280 |mark=Red circle.svg |mark_width=12 |mark_link=η Leonis |x=768|y=474 }} |caption=Location of η Leo (circled) }}{{Starbox observe | epoch=J2000 | ra={{RA|10|07|19.95186}}[1] | dec={{DEC|16|45|45.592}}[1] | appmag_v=3.486[2] | constell=Leo }}{{Starbox character |class=A0 Ib[2] |b-v=−0.026[2] |u-b=−-0.206[2] |variable= }}{{Starbox astrometry | radial_v=1.40[3] | prop_mo_ra=−2.80[1] | prop_mo_dec=−1.82[1] | parallax=2.57 | p_error=0.16 | parallax_footnote=[1] | absmag_v=-5.54[4] }}{{Starbox detail | mass=10[12] | radius=47[4] | luminosity=19,000[12] | temperature=9,600[2] | gravity=2.00[12] | metal=-0.04[4] | rotational_velocity=2[2] | age_myr=25[5] }}{{Starbox catalog |names=η Leo, 30 Leo, HR 3975, BD+17° 2171, HD 87737, FK5 379, HIP 49583, SAO 98955, GC 13899 }}{{Starbox reference |Simbad=HD+87737 }}{{Starbox end}}Eta Leonis (η Leo, η Leonis) is a fourth-magnitude star in the constellation Leo. It doesn't have a proper name. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[6] PropertiesEta Leonis is a white supergiant with the stellar classification A0Ib. Though its apparent magnitude is 3.5, making it a relatively dim star to the naked eye, it is nearly 20,000 times more luminous than the Sun, with an absolute magnitude of -5.60. The Hipparcos astrometric data has estimated the distance of Eta Leonis to be roughly 400 parsecs from Earth, or 1,300 light years away. There is evidence suggesting that Eta Leonis is part of a binary star system. References1. ^1 2 3 4 {{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }} 2. ^1 2 3 4 5 {{cite journal|bibcode=2012A&A...543A..80F|arxiv=1207.0308|title=Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters|journal=Astronomy & Astrophysics|volume=543|pages=A80|author1=Firnstein|first1=M.|last2=Przybilla|first2=N.|year=2012|doi=10.1051/0004-6361/201219034}} 3. ^{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759|author1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 }} 4. ^1 2 {{cite journal|bibcode=2006A&A...445.1099P|arxiv = astro-ph/0509669|title = Quantitative spectroscopy of BA-type supergiants|journal = Astronomy and Astrophysics|volume = 445|issue = 3|pages = 1099|author1 = Przybilla|first1 = N.|last2 = Butler|first2 = K.|last3 = Becker|first3 = S. R.|last4 = Kudritzki|first4 = R. P.|year = 2006|doi = 10.1051/0004-6361:20053832}} 5. ^1 2 3 {{cite journal|bibcode=2013NewA...25...50T|arxiv=1512.04557|title=Elemental abundances of the supergiant stars σ Cygnus and η Leonis|journal=New Astronomy|volume=25|pages=50|author1=Tanrıverdi|first1=Taner|year=2013|doi=10.1016/j.newast.2013.03.013}} 6. ^{{citation | last1=Garrison | first1=R. F. | title=Anchor Points for the MK System of Spectral Classification | journal=Bulletin of the American Astronomical Society | volume=25 | page=1319 |date=December 1993 | bibcode=1993AAS...183.1710G}} External links
8 : Leo (constellation)|Bayer objects|A-type supergiants|Durchmusterung objects|Flamsteed objects|HR objects|Henry Draper Catalogue objects|Hipparcos objects |
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