Kalpana Kalpana (Editor)

LP 944 20

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Magnitude
  
18.69

Apparent magnitude (V)
  
18.69

Constellation
  
Fornax

LP 944-20 wwwsolstationcomstarslp94420jpg

Similar
  
DEN 1048−3956, LHS 292, SCR 1845‑6357, Teegarden's star, DX Cancri

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, it has one of the dimmest visual magnitudes listed on the RECONS page.

Contents

On 15 December 1999 a flare was detected.

Distance

The first parallax measurement from 1996 found that LP 944-20 (designated there as BRI 0337−3535) has a relative parallax of π r = 200.0 ± 4.2 mas, and its correction from relative to absolute parallax (i.e. mean parallax of the reference frame stars) is π r e f = 1.4 ± 0.3 mas. This yields an absolute parallax of π r + π r e f = 200.0 + 1.4 = 201.4 mas, with a standard deviation (according to σ X + Y 2 = σ X 2 + σ Y 2 ) of σ π r 2 + σ π r e f 2 = 4.2 2 + 0.3 2 = 4.21 mas, which corresponds to a distance of 7000500000000000000♠5±0.1 pc, or 7001162000000000000♠16.2±0.3 ly. (The same values of absolute parallax and its standard deviation are in the RECONS' TOP100 list.

A newer parallax, published in 2013, is 7002155890000000000♠155.89±1.03 mas (7000641000000000000♠6.41±0.04 pc or 7001209200000000000♠20.92±0.14 ly).

Lithium and clouds

Observations published in 2007 showed that the atmosphere of LP 944-20 contains much lithium and that it has dusty clouds.

References

LP 944-20 Wikipedia
(Text) CC BY-SA