Groombridge 1830
{{short description|Star in the constellation Ursa Major}}
{{Starbox begin}}
{{Starbox_image
|image={{Location mark
| image = Ursa Major constellation map.svg
|width=300
|y%=83.6 |x%=41.3
|mark=Location dot red.svg | mark_width=5
|float=center | mark_link=Groombridge 1830
}}
|caption=The red dot shows the location of Groombridge 1830 in Ursa Major.
}}
{{Starbox_image
|image=300px
|caption=Detailed position of HR 4550 ( = Groombridge 1830; bottom-left edge) related to Chi UMa and Psi UMa.
}}
{{Starbox observe
| epoch = J2000
| dec = {{DEC|+37|43|07.2541}}
| constell = Ursa Major
}}
{{Starbox character
}}
{{Starbox astrometry
| radial_v = {{val|-98.05|0.12}}
| prop_mo_ra = +4002.7
| prop_mo_dec = {{val|-5817.8}}
| parallax = 109.0296
| p_error = 0.0197
}}
{{Starbox detail
| mass = {{val|0.63|0.02}}
| radius = {{val|0.586|0.004}}
| luminosity = {{val|0.221|0.005}}
| temperature = {{val|5174|32|fmt=commas}}
| gravity = {{val|4.702|0.015}}
| metal_fe = {{val|-1.26|0.07}}
| rotation =
}}
{{Starbox catalog
| names = BD+38 2285, FK5 1307, GCTP 2745.00, GJ 451, HIP 57939, HR 4550, HD 103095, LHS 44, LTT 13276, SAO 62738, 1830 Groombridge, Argelander's Star
}}
{{starbox reference
| Simbad = Groombridge+1830
}}
{{Starbox end}}
Groombridge 1830 (also known as 1830 Groombridge or Argelander's Star)Peters, C. A. F.; "On the Parallax of Argelander's Star", Monthly Notices of the Royal Astronomical Society, December 1853, v.50, p.302, {{bibcode|1853MNRAS..14...49P}} is a star in the constellation Ursa Major.
Description
It is a yellow-hued class G8 main sequence star catalogued by British astronomer Stephen Groombridge with the Groombridge Transit Circle between 1806 and the 1830s and published posthumously in his star catalog, Catalogue of Circumpolar Stars (1838). Its high proper motion was noted by Friedrich Wilhelm Argelander in 1842. The low metallicity of this star makes some of its spectral lines resemble those of a G-class star, and it has been given as a spectral standard for the class G7V.
It is {{Convert|29.9|ly|pc|abbr=off|lk=on}} from the Sun as measured by the Gaia spacecraft, which, as the distance is nearly 10 parsecs, means its absolute magnitude is almost equal to its apparent magnitude. It is a member of the galactic halo; such stars account for only 0.1 to 0.2 percent of the stars near the Sun. Like most halo stars, it has a low abundance of elements other than hydrogen and helium—what astronomers term a metal-poor star.
Once suspected of being a binary star with a period of 175 days, current consensus is that it is single. Previous suspected observations of a stellar companion were probably "superflares"—analogous to the Sun's solar flares, but hundreds to millions of times more energetic. It had one of the first nine identified superflares.
Proper motion
When discovered, it had the highest proper motion of any star known, replacing 61 Cygni in that department. Later it dropped to second place after the discovery of Kapteyn's Star, and still later to third place after the discovery of Barnard's Star. It is considerably farther away than either of those stars, however, which means its transverse velocity is greater.
See also
References
{{reflist|refs=
| display-authors=1 | last1=Holmberg | first1=J.
| last2=Nordström | first2=B. | last3=Andersen | first3=J.
| title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics
| volume=501 | issue=3 |date=July 2009 | pages=941–947
| journal=Astronomy and Astrophysics
| doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H
| arxiv=0811.3982 | s2cid=118577511 }}
{{Cite Gaia DR3|4034171629042489088}}
}}
External links
- [http://www.solstation.com/stars/groo1830.htm SolStation.com: Groombridge 1830] at SolStation
- {{Cite journal |first1=Garik |last1=Israelian |last2=García López |first2=Ramon J. |date=1998 |last3=Rebolo |first3=Rafael |title=Oxygen Abundances in Unevolved Metal-poor Stars from Near-Ultraviolet OH Lines |journal=Astrophysical Journal |volume=507 |issue=2 |pages=805–817 |doi=10.1086/306351 |bibcode=1998ApJ...507..805I|arxiv = astro-ph/9806235 |s2cid=18215356 }}
- {{cite journal |language=de |bibcode=1842AN.....19..393A |title=Schreiben des Herrn Professors Argelander Directors der Sternwarte in Bonn, an den Herausgeber |last1=Argelander |first1=Friedrich Wilhelm August |journal=Astronomische Nachrichten |date=1842 |volume=19 |issue=26 |page=393 |doi=10.1002/asna.18420192604 }}
- {{cite journal |language=de |bibcode=1843AN.....20..163P |title=Beobachtungen des Cometen auf der Altonaer Sternwarte. Von Herrn Observator Ritter Petersen |last1=Petersen |first1=A. C. |journal=Astronomische Nachrichten |date=1843 |volume=20 |issue=10 |page=163 |doi=10.1002/asna.18430201003 }}
- {{cite journal |language=fr |bibcode=1843AN.....20..279J |title=L'Idée de parvenir à l'isochronisme des vibrations du pendule à l'aide du ressort auquel le pendule estsuspendu, est concue par Urbain-Jürgensen, et émise dans le numéro 49 des Astr. Nachr. 1823 Par Mr. Louis Urbain Jürgensen |last1=Jürgensen |first1=Louis Urban |journal=Astronomische Nachrichten |date=1843 |volume=20 |page=279 |doi=10.1002/asna.18430201703 }}
{{Stars of Ursa Major}}