Lalande 21185

Lalande 21185
The red circle shows the approximate location of Lalande 21185 in Ursa Major
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 11h 03m 20.19482s[1]
Declination +35° 58′ 11.5762″[1]
Apparent magnitude (V) 7.520[2]
Characteristics
Spectral type M2V[3]
Apparent magnitude (B) 8.960 ± 0.007[2]
Apparent magnitude (V) 7.520 ± 0.009[2]
Apparent magnitude (R) ~6.6[3]
Apparent magnitude (I) ~5.8[3]
Apparent magnitude (J) 4.203 ±0.242[3]
Apparent magnitude (H) 3.640 ±0.202[3]
Apparent magnitude (K) 3.254 ±0.306[3]
U−B color index +1.074[2]
B−V color index +1.444[2]
Variable type BY[4]
Astrometry
Radial velocity (Rv)−85.11±0.13[1] km/s
Proper motion (μ) RA: −580.057 mas/yr[1]
Dec.: −4776.589 mas/yr[1]
Parallax (π)392.7529 ± 0.0321 mas[1]
Distance8.3044 ± 0.0007 ly
(2.5461 ± 0.0002 pc)
Absolute magnitude (MV)10.48[5]
Details
Mass0.389±0.008[6] M☉
Radius0.392±0.004[6] R☉
Luminosity (bolometric)0.02194±0.00021[6] L☉
Luminosity (visual, LV)0.0055[nb 1] L☉
Surface gravity (log g)4.895+0.008
−0.010[7] cgs
Temperature3,547±18[6] K
Metallicity [Fe/H]−0.3621+0.0872
−0.0687[7] dex
Rotation56.15±0.27 d[8]
Age8.047+3.958
−4.523[7] Gyr
Other designations
NSV 18593, BD+36 2147, GJ 411, HD 95735, HIP 54035, SAO 62377, G 119-052, LFT 756, LHS 37, LTT 12960, NLTT 26105, PLX 2576, IRAS 11005+3615, 2MASS J11032023+3558117, J11032027+3558203, MCC 594[3]
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata

Lalande 21185 (also known as BD+36 2147, Gliese 411, and HD 95735[3]) is a star in the south of Ursa Major. It is the apparent brightest red dwarf in the northern hemisphere.[nb 2][9][10] Despite this, and being relatively close by, it is very dim (as are all red dwarfs), being only magnitude 7.5 in visible light and thus too faint to be seen with the unaided eye. The star is visible through a small telescope or binoculars.[11]

At 8.304 light-years (2.546 parsecs)[1] away it is one of the stars nearest to the Solar System; only the Alpha Centauri system, Barnard's Star, Wolf 359, and the brown dwarfs Luhman 16 and WISE 0855−0714 are known to be closer.[12] Because of its proximity it is a frequent subject for astronomical surveys and other research and thus is known by numerous other designations, most commonly Gliese 411 and HD 95735. In approximately 19,900 years it will be at its closest, about 4.65 ly (1.43 pc) from the Sun, just over half its present distance.[13][14]

Lalande 21185 has two known exoplanets and one candidate exoplanet, making it the third closest confirmed planetary system to the Solar System.

  1. ^ a b c d e f Cite error: The named reference Gaia3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference aaass61 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h "HD 95735". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-05-29.
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference johnson was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Hurt2021 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Stock2020 was invoked but never defined (see the help page).
  9. ^ Dickinson, David (2015-12-23). "14 Red Dwarf Stars to View with Backyard Telescopes". Universe Today. Retrieved 2016-12-04.
  10. ^ Croswell, Ken (July 2002). "The Brightest Red Dwarf". KenCroswell.com. Retrieved 2016-12-04.
  11. ^ Cite error: The named reference sherrod_koed2003 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Reylé2021 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference García-Sánchez2001 was invoked but never defined (see the help page).
  14. ^ "Annotations on HD 95735 object". Centre de données astronomiques de Strasbourg. Retrieved 2010-04-14.


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