| 词条 | 9 Hydrae |
| 释义 |
|epoch=J2000 |constell=Hydra |ra={{RA|08|41|43.33626}}[1] |dec={{DEC|-15|56|36.1846}}[1] |appmag_v=4.866[2] }}{{Starbox character |class=K0IIICNII[3] |b-v=+1.07[4] |u-b=+0.92[4] }}{{Starbox astrometry |radial_v=0.17[5] |prop_mo_ra=3.71[1] |prop_mo_dec=-97.06[1] |parallax=15.40 |p_error=0.21 |parallax_footnote=[1] }}{{Starbox detail |mass=1.72 ± 0.46[6] |radius=11[5] |temperature=4688 ± 5[5] |luminosity=49[5] |gravity=2.8[5] |metal_fe=-0.01[5] |rotational_velocity= }}{{Starbox catalog |names={{odlist|BD=-15° 2554|FK5=2684|HD=74137|HIP=42662|HR=3441|SAO=154552}} }}{{Starbox reference |Simbad=9+Hya }}{{Starbox end}} 9 Hydrae (9 Hya) is a star in the constellation Hydra. Its apparent magnitude is 4.87. References1. ^1 2 3 4 {{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}} {{Stars of Hydra}}{{giant-star-stub}}2. ^{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}} 3. ^{{cite journal|bibcode=1988mcts.book.....H|title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0.|journal=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars|volume=4|author1=Houk, N.|author2=Smith-Moore, M.|year=1988}} 4. ^1 {{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}} 5. ^1 2 3 4 5 {{cite journal|bibcode=2008AJ....135..209M|doi=10.1088/0004-6256/135/1/209|title=Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity|journal=The Astronomical Journal|volume=135|pages=209|year=2008|last1=Massarotti|first1=Alessandro|last2=Latham|first2=David W.|last3=Stefanik|first3=Robert P.|last4=Fogel|first4=Jeffrey}} 6. ^{{cite journal|title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures|author1=Allende Prieto, C.|author2=Lambert, D. L.|journal=Astronomy and Astrophysics|volume=352|pages=555–562|date=1999|bibcode=1999A&A...352..555A|arxiv=astro-ph/9911002}} 7 : Hydra (constellation)|K-type giants|Flamsteed objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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