Ross 154

Ross 154

Starbox begin
name=Ross 154cite web
url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V1216+Sgr
title=V* V1216 Sgr -- Flare Star
publisher=Centre de Données astronomiques de Strasbourg
accessdate=2008-06-12] Starbox observe
epoch=J2000
constell=Sagittarius
ra=RA|18|49|49.3625
dec=DEC|−23|50|10.437
appmag_v=10.95 Starbox character
class=M3.5V
b-v=1.76 [cite journal
last=Corben | first=P. M. | coauthors="et al"
title=U, B, V photometry of 500 southern stars
journal=Monthly Notes of the Astronomical Society of South Africa | year=1972 | volume=31 | pages=7–22
url=http://adsabs.harvard.edu/abs/1972MNSSA..31....8C
accessdate=2008-06-12 ]
u-b=
variable=Flare star Starbox astrometry
radial_v=−4.0
prop_mo_ra=637.57
prop_mo_dec=−192.47
parallax=336.48
p_error=1.82
parallax_footnote= [cite journal
last=Perryman | first=M. A. C. | coauthors="et al"
title=The Hipparcos Catalogue
journal=Astronomy & Astrophysics
year=1997 | volume=323 | pages=L49–L52
url=http://adsabs.harvard.edu/abs/1997A&A...323L..49P%7D,
accessdate=2008-06-12 ]
absmag_v=13.07 Starbox detail
mass=0.17
radius=0.24
luminosity=0.0038 [cite journal
last=Pettersen | first=B. R.
title=Physical parameters of solar neighbourhood flare stars
journal=Astronomy and Astrophysics
year=1980 | volume=82 | issue=1–2
url=http://cdsads.u-strasbg.fr/abs/1980A%26A....82...53P
pages=53–60 | accessdate=2008-06-13 ]
temperature=3,105
age=under 109
rotation = "v" sin "i" = 3.5±1.5 km/s
metal=egin{smallmatrix}left [ frac{Fe}{H} ight] approx -0.25end{smallmatrix}
gravity= Starbox catalog
names=GCTP 4338, GJ 729, LHS 3414, V1216 Sagittarii, AC-24 2833-183, HIP 92403.

Ross 154 (V1216 Sgr) is a red dwarf star approximately 3.0 pc or 9.68 light years from the Sun. It is the nearest star in the southern constellation Sagittarius, and one of the closest to the Sun. Its nearest neighbor is Barnard's star, located 1.66 pc (5.41 ly) away.

This star was first catalogued by Frank Elmore Ross in 1925, and formed part of his fourth list of new variable stars. [cite journal
last=Ross | first=Frank E.
title=New variable stars, (fourth list)
journal=Astronomical Journal
year=1926 | volume=37 | pages=91
url=http://adsabs.harvard.edu/abs/1927AJ.....37...91R
accessdate=2008-06-13 ] It was found to be a UV Ceti-type flare star, with a mean time between major flares of about two days. [cite journal
last=Jarrett | first=A. H. | coauthors=Grabner, G.
title=On the Period Between Flares of V1216 Sagittarii
journal=Information Bulletin on Variable Stars,
year=1976 | issue=1221 | pages=1
url=http://adsabs.harvard.edu/abs/1976IBVS.1221....1J
accessdate=2008-06-13 ] Typically, the star will increase by 3–4 magnitudes during a flare. [cite journal
last=Costa | first=R.
coauthors=Cristaldi, S.; Rodono, M.
title=Cooperative Observations of the Flare Star V1216 Sgr
journal=Information Bulletin on Variable Stars
year=1970 | volume=461 | pages=1–4
url=http://articles.adsabs.harvard.edu/abs/1970IBVS..461....1C
accessdate=2008-06-13 ] However, at 11th magnitude, this star is much too faint to be viewed with the unaided eye and requires at least a 65 mm telescope aperture to be seen under ideal conditions. [cite book
first=H. Robert | last=Mills | year=1994
title=Practical Astronomy: A User-friendly
pages=199 | publisher=Horwood Publishing
isbn=1898563020 ]

Ross 154 has an estimated 17% of the Sun's masscite web
author=Staff | date=January 1, 2008
url=http://www.chara.gsu.edu/RECONS/TOP100.posted.htm
title=The One Hundred Nearest Star Systems
publisher=Research Consortium on Nearby Stars
accessdate=2008-06-12 ] and is only 24% of the Sun's radius.cite journal
last=Johnson | first=H. M. | coauthors=Wright, C. D.
title=Predicted infrared brightness of stars within 25 parsecs of the sun
journal=Astrophysical Journal Supplement Series
year=1983 | volume=53 | pages=643–711
url=http://adsabs.harvard.edu/abs/1983ApJS...53..643J
accessdate=2008-06-12 —see p. 693.] Based on the relatively high projected rotation, this is probably a young star with an estimated age of less than a billion years. The abundance of elements heavier than helium is about half that of the Sun. The strength of the star's magnetic field is an estimated 2.6±0.3 kG. This star is an X-ray source and it has been detected by several X-ray observatories. X-ray flare emission from Ross 154 has been observed by Chandra observatory.cite journal
last=Wargelin | first=B. J.
coauthors=Kashyap, V. L.; Drake, J. J.; García-Alvarez, D.; Ratzlaff, P. W.
title=X-Ray Flaring on the dMe Star, Ross 154
journal=The Astrophysical Journal
year=2008 | volume=676 | issue=1 | pages=610–627
url=http://adsabs.harvard.edu/abs/2007arXiv0712.2791W
accessdate=2008-06-12 ]

The space velocity components of this star are U = –9, V = 0 and W = -8 km/s. It has not been identified as a member of a specific stellar moving group. [cite journal
last=Montes | first=D.
coauthors=López-Santiago, J.; Gálvez, M. C.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M.
title=Late-type members of young stellar kinematic groups - I. Single stars
journal=Monthly Notices of the Royal Astronomical Society
year=2001 | volume=328 | issue=1 | pages=45–63
url=http://adsabs.harvard.edu/abs/2001MNRAS.328...45M
accessdate=2008-06-13 ] It is orbiting through the Milky Way galaxy at a distance from the core that varies from 8.478–9.400 kpc and an orbital eccentricity of 0.052. [cite journal
last=Allen | first=C. | coauthors=Herrera, M. A.
title=The galactic orbits of nearby UV Ceti stars
journal=Revista Mexicana de Astronomia y Astrofisica
year=1998 | volume=34 | pages=37–46
url=http://adsabs.harvard.edu/abs/1998larm.confE.115A
accessdate=2008-06-13 ] Based on its low velocity relative to the Sun, this is believed to be a young disk (Population I) star. [cite journal
last=Veeder | first=G. J.
title=Old disk flare stars
journal=Astronomical Journal
year=1974 | volume=79 | pages=702–704
url=http://adsabs.harvard.edu/abs/1974AJ.....79..702V
accessdate=2008-06-13 ] It is predicted that this star will make its closest approach to the Sun in 150,000 years, when it comes within 1.88 ± 0.08 pc (6.13 ly). [cite journal
last=García-Sánchez | first=J.
coauthors=Weissman, P. R.; Preston, R. A.; Jones, D. L.; Lestrade, J.-F.; Latham, D. W.; Stefanik, R. P.; Paredes, J. M.
title=Stellar encounters with the solar system
journal=Astronomy and Astrophysics
year=2001 | volume=379 | pages=634–659
url=http://adsabs.harvard.edu/abs/2001A&A...379..634G
accessdate=2008-06-12 ]

No low-mass companions have been discovered in orbit around this star. [cite journal
last=Hinz | first=Joannah L.
coauthors=McCarthy, Donald W., Jr.; Simons, Doug A.; Henry, Todd J.; Kirkpatrick, J. Davy; McGuire, Patrick C.
title=A Near-Infrared Wide-Field Proper Motion Search for Brown Dwarfs
journal=The Astronomical Journal
year=2002 | volume=123 | issue=4 | pages=2027–2032
url=http://adsabs.harvard.edu/abs/2002astro.ph..1140H
accessdate=2008-06-12]

ee also

* Frank Elmore Ross
* List of nearest stars
* Ross 154 in fiction

References

External links

* [http://www.solstation.com/stars/ross154.htm SolStation.com: Ross 154]


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