- Distance
- Lithium and clouds
- Notes
- References
- External links
| name = LP 944-20
}}{{Starbox observe
| epoch = J2000
| equinox = J2000
| constell = Fornax
| ra={{RA|03|39|35.220}}[1]
| dec={{DEC|–35|25|44.09}}[1]
| appmag_v = 18.69[3]
}}{{Starbox character
| class = M9[1]
| appmag_1_passband = B
| appmag_1 = ~20.17[1]
| appmag_2_passband = I
| appmag_2 = ~13.288[1]
| appmag_3_passband = J
| appmag_3 = {{val|10.725|0.021}}[1]
| appmag_4_passband = H
| appmag_4 = {{val|10.017|0.021}}[1]
| appmag_5_passband = K
| appmag_5 = {{val|9.548|0.023}}[1]
}}{{Starbox astrometry
| radial_v =
| prop_mo_ra = {{val|317|60}}[1]
| prop_mo_dec = {{val|276|52}}[1]
| parallax = 155.89
| p_error = 1.03
| parallax_footnote = [2]{{r|Lurie2014}}
| absmag_v = 20.02{{Starbox detail
| source =
| mass =0.07[3]
}}{{Starbox catalog
| names =LP 944-20,
SIPS J0339−3525,
LEHPM 3451,
2MASSI J0339352−352544,
[B2006] J033935.2−352544,
APMPM J0340−3526,
2MASS J03393521−3525440,
2MASSW J0339352−352544,
BRI B0337−3535,
BRI 0337−3535,
2MUCD 10201
}}{{Starbox reference
| Simbad = LP+944-20
}}{{Starbox end}}
LP 944-20 is a dim brown dwarf of spectral class M9 located about 21 light-years from the Solar System in the constellation of Fornax. With a visual apparent magnitude of 18,[3] it has one of the dimmest visual magnitudes listed on the RECONS page.
On 15 December 1999 an X-ray flare was detected.[3][4] On 27 July 2000, radio emission (in flare and quiescence) was detected from this brown dwarf by a team of students at the Very Large Array, reported in the 15 March 2001 issue of the journal Nature.[5]
Distance
The first parallax measurement from 1996 found that LP 944-20 (designated there as BRI 0337−3535) has a relative parallax of 
mas, and its correction from relative to absolute parallax (i.e. mean parallax of the reference frame stars) is 
mas. This yields an absolute parallax of 
mas, with a standard deviation (according to 
[6]) of 
mas, which corresponds to a distance of {{val|5|0.1}} pc, or {{val|16.2|0.3}} ly.[7] (The same values of absolute parallax and its standard deviation are in the RECONS' TOP100 list.[8][9]
A newer parallax, published in 2013, is {{val|155.89|1.03}} mas ({{val|6.41|0.04}} pc or {{val|20.92|0.14}} ly).[2]
Lithium and clouds
Observations published in 2007 showed that the atmosphere of LP 944-20 contains much lithium and that it has dusty clouds.[10]
Notes
2. ^1 {{cite journal | last=Dieterich |first=Sergio B. | author2=Todd J. Henry | author3=Wei-Chun Jao | author4=Jennifer G. Winters | author5=Altonio D. Hosey | date=2013 | title=The Solar Neighborhood XXXII: The Hydrogen Burning Limit | journal= | volume= | issue= | pages= | arxiv=1312.1736v1 | bibcode=}}
3. ^{{cite journal|last1=Rutledge|first1=Robert E.|last2=Basri|first2=Gibor|last3=Martín|first3=Eduardo L.|last4=Bildsten|first4=Lars|title=Chandra Detection of an X-Ray Flare from the Brown Dwarf LP 944-20|journal=The Astrophysical Journal|date=1 August 2000|volume=538|issue=2|pages=L141–L144|arxiv=astro-ph/0005559|bibcode=2000ApJ...538L.141R|doi=10.1086/312817}}
4. ^{{cite web|url=http://www.solstation.com/stars/lp944-20.htm|title=LP 944-20|website=Solstation.com|accessdate=2017-03-11}}
5. ^{{cite journal|last1=Berger|first1=E.|last2=Ball|first2=S.|last3=Becker|first3=K. M.|last4=Clarke|first4=M.|last5=Frail|first5=D. A.|last6=Fukuda|first6=T. A.|last7=Hoffman|first7=I. M.|last8=Mellon|first8=R.|last9=Momjian|first9=E.|last10=Murphy|first10=N. W.|last11=Teng|first11=S. H.|last12=Woodruff|first12=T.|last13=Zauderer|first13=B. A.|last14=Zavala|first14=R. T.|title=Discovery of radio emission from the brown dwarf LP944-20|journal=Nature|date=2001-03-15|volume=410|issue=6826|pages=338–340|arxiv=astro-ph/0102301|bibcode=2001Natur.410..338B|doi=10.1038/35066514}}
6. ^Mean and Variance of Random Variables
7. ^{{cite journal | last=Tinney |first=C. G. | date=1996 | title=CCD astrometry of southern very low-mass stars | journal=Monthly Notices of the Royal Astronomical Society | volume=281 | issue=2 | pages=644–658 | bibcode=1996MNRAS.281..644T | doi=10.1093/mnras/281.2.644}}
8. ^1 2 3 {{cite web |author=Research Consortium on Nearby Stars |publisher=Georgia State University |date = 1 January 2012 |title=The 100 nearest star systems |journal=RECONS |url=http://www.astro.gsu.edu/RECONS/TOP100.posted.htm |accessdate = 12 February 2017}}
9. ^In RECONS' TOP100 older versions the standard deviation value was 4.20 mas, not 4.21 mas.
10. ^{{ cite journal | title=Lithium in LP944-20 | author=Pavlenko, Ya. V.; Jones, H. R. A.; Martín, E. L.; Guenther, E.; Kenworthy, M. A.; Zapatero Osorio, M. R.| journal=Monthly Notices of the Royal Astronomical Society | volume=380 | issue=3 | pages=1285–96 | date=September 2007 | doi=10.1111/j.1365-2966.2007.12182.x | bibcode=2007MNRAS.380.1285P | arxiv = 0707.0694 }}
References
}}
External links
- "The 100 nearest star systems", Research Consortium on Nearby Stars
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