Lacaille 9352

Lacaille 9352
Observation data
Epoch J2000      Equinox J2000
Constellation Piscis Austrinus
Right ascension 23h 05m 52.0353s[1]
Declination –35° 51′ 11.055″[1]
Apparent magnitude (V) 7.34[1]
Characteristics
Spectral type M0.5V[2]
U−B color index +1.18[3]
B−V color index +1.50[3]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv) +9.7[1] km/s
Proper motion (μ) RA: 6,766.63[1] mas/yr
Dec.: 1,327.99[1] mas/yr
Parallax (π) 303.89 ± 0.87[1] mas
Distance 10.73 ± 0.03 ly
(3.291 ± 0.009 pc)
Absolute magnitude (MV) 9.75
Details
Mass 0.503 ± 0.025[2] M☉
Radius 0.459 ± 0.011[2] R☉
Luminosity 0.011 L☉
Luminosity (bolometric) 0.033[note 1] L☉
Temperature 3,626[2] K
Metallicity \begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ -0.22 \pm -0.09\end{smallmatrix}[5]
Rotational velocity (v sin i) 1[6] km/s
Other designations
HD 217987, CD -36°15693 GCTP 5584, GJ 887, LHS 70, SAO 214301, LTT 9348, LFT 1758, Cordoba 31353, NSV 14420, HIP 114046, UGPMF 591.[1]

Lacaille 9352 (Lac 9352) is a red dwarf star approximately 3.29 pc or 10.74 light years from Earth's Solar System. This star has the fourth highest known proper motion,[7] moving a total of 6.9 arcseconds per year. (This is still a very small movement overall, however, as there are 3,600 arcseconds in a degree of arc.) It is the tenth closest star system to the Solar System[8] and is the closest star in the constellation Piscis Austrinus. The ChView simulation[9] shows that its closest neighbour is the EZ Aquarii triple star system at about 4.1 ly from Lacaille 9352.

This was the first red dwarf star to have its angular diameter measured.[10] The space velocity components of this star are (U, V, W) = (–93.9, –14.1, –51.4) km/s.[11] If the radial velocity (Vr) equals +9.7 km/s then about 2,700 years ago Lacaille 9352 was at its minimal distance of approximately 3.26 pc from the Sun.[12]

Contents

See also

Notes

  1. ^ From L=4πR2σTeff4, where L is the luminosity, R is the radius, Teff is the effective surface temperature and σ is the Stefan–Boltzmann constant.

References

  1. ^ a b c d e f g h "NAME LACAILLE 9352 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+217987&submit=SIMBAD+search. Retrieved 2010-01-20. 
  2. ^ a b c d Demory, B.-O.; et al. (October 2009). "Mass-radius relation of low and very low-mass stars revisited with the VLTI". Astronomy and Astrophysics 505 (1): 205–215. Bibcode 2009A&A...505..205D. doi:10.1051/0004-6361/200911976. 
  3. ^ a b Cousins, A. W. J. (1973). "UBV photometry of some southern stars". Monthly Notes of the Astronomical Society of Southern Africa 32: 11. Bibcode 1973MNSSA..32...11C. 
  4. ^ Micela, G.; Pye, J.; Sciortino, S. (April 1997). "Coronal properties of nearby old disk and halo dM stars". Astronomy and Astrophysics 320: 865–877. Bibcode 1997A&A...320..865M. 
  5. ^ López-Morales, Mercedes (May 2007). "On the Correlation between the Magnetic Activity Levels, Metallicities, and Radii of Low-Mass Stars". The Astrophysical Journal 660 (1): 732–739. arXiv:astro-ph/0701702. Bibcode 2007ApJ...660..732L. doi:10.1086/513142. 
  6. ^ Torres, C. A. O. (December 2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics 460 (3): 695–708. arXiv:astro-ph/0609258. Bibcode 2006A&A...460..695T. doi:10.1051/0004-6361:20065602. 
  7. ^ "High Proper Motion Stars in the Hipparcos Catalogue". European Space Agency. July 1, 2007. http://www.rssd.esa.int/index.php?project=HIPPARCOS&page=hpm. Retrieved 2010-01-20. 
  8. ^ Research Consortium on Nearby Stars. "The One Hundred Nearest Star Systems". Georgia State University. http://www.chara.gsu.edu/RECONS/TOP100.posted.htm. Retrieved 2010-01-20. 
  9. ^ "Solstation and ChView". http://www.solstation.com/. Retrieved 2010-04-20. 
  10. ^ Glindemann, Andreas; Paresce, Francesco. "Giant Eyes for the VLT Interferometer". European Southern Observatory. http://www.eso.org/public/news/eso0134/. Retrieved 2010-01-20. 
  11. ^ "ARICNS star page of Lacaille 9352". Astronomisches Rechen-Institut Heidelberg. http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c01887.htm. Retrieved 2010-04-16. 
  12. ^ "Annotations on NAME LACAILLE 9352 object". SIMBAD. Centre de Données astronomiques de Strasbourg. http://cdsannotations.u-strasbg.fr/annotations/simbadObject/1191721. Retrieved 2010-04-16. 

External links

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