SCR 1845−6357

SCR 1845−6357 is a binary system, about 12.6 light-years away in the constellation Pavo. The primary is a faint red dwarf. It has a brown dwarf companion. The primary red dwarf was discovered in 2004 by Hambly et al, while the secondary brown dwarf was later discovered in 2006.

SCR 1845−6357A

Three-colour image of SCR1845−6357AB generated from the SDI filter images (blue=1.575 µm, green=1.600 µm, red=1.625 µm). Because the T-dwarf fades away towards the longer wavelengths, it appears quite blue in this image. It is roughly 50 times fainter than the star and is separated from it by an angle of 1.17″ on the sky (4.5 times the Earth-Sun distance).
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pavo
Right ascension  18h 45m 05.26s[1]
Declination −63° 57′ 47.8″[1]
Apparent magnitude (V) 17.4[2]
Characteristics
Spectral type M8.5[3]
Astrometry
Proper motion (μ) RA: 2444[2] mas/yr
Dec.: 696[2] mas/yr
Parallax (π)249.92 ± 0.16[4] mas
Distance13.050 ± 0.008 ly
(4.001 ± 0.003 pc)
Details
Mass0.07[5] M☉
Radius0.096 R☉
Luminosity0.0004 L☉
Temperature2600–2700[3] K
Other designations
DENIS-P J184504.9-635747, 2MASS J18450541-6357475, SCR J1845-6357,[2] SCR 1845A[3], Gaia DR2 6439125097425259776
Database references
SIMBADThe system
A

System
Artist's impression of the SCR 1845-6357 stellar system

The primary, SCR 1845−6357A, is a faint (apparent magnitude 17.4)[2] ultra-cool red dwarf with a mass of about 7% of the Sun's. However, the measurements are still preliminary and are subject to change.[5]

SCR 1845-6357B
Position (relative to A)
Epoch of observationJ2006.3
Angular distance1.064 ± 0.004″ [3]
Position angle177.2 ± 0.06° [3]
Observed separation
(projected)		4.10 ± 0.04 AU [6]
Characteristics
Spectral type T6[3]
Apparent magnitude (J) 13.26[7]
Details
Mass0.04 to 0.05[3] M☉
Surface gravity (log g)5.1[3] cgs
Temperature950[3] K
Age1.8×109 to 3.1×109[3] years
Other designations
SCR J1845−6357B,[8] SCR 1845B[3]
Database references
SIMBADB
SCR 1845-6357, right bottom

This star has been found to possess a brown dwarf companion, designated SCR 1845-6357B. The companion, classified as a T-dwarf, has an observed projected distance of 4.1 AU, an estimated mass between 40 and 50 times the mass of Jupiter, and an estimated effective temperature of 950 K.[3][6] The brown dwarf has a near-IR J-band magnitude of 13.26.[7]

gollark: Yes, sometimes people who do things can in fact be interacted with.
gollark: There's CC: Tweaked, even if CC *itself* is dead.
gollark: I did try that some time ago, but it turned out to be annoying to get it to work consistently.
gollark: Computer mods aren't used much because it's very annoying to make them perform tasks more focused mods can do better.
gollark: It encourages people to not write code which can deal with sudden interuptions.

References
  1. Henry, T. J.; Jao, Wei-Chun; Subasavage, John P.; Beaulieu, Thomas D.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. (2006). "The Solar Neighborhood. XVII. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the RECONS 10 Parsec Sample" (PDF). The Astronomical Journal. 132 (6): 2360–2371. arXiv:astro-ph/0608230. Bibcode:2006AJ....132.2360H. doi:10.1086/508233.CS1 maint: multiple names: authors list (link)
  2. "DENIS-P J184504.9-635747". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. The very nearby M/T dwarf binary SCR 1845-6357, Markus Kasper, Beth A. Biller, Adam Burrows, Wolfgang Brandner, Jano Budaj, and Laird M. Close, Astronomy and Astrophysics 471, #2 (August 2007), pp.655–659. Bibcode: 2007A&A...471..655K. doi:10.1051/0004-6361:20077881.
  4. Gaia archive
  5. Research Consortium On Nearby Stars, Georgia State University (January 1, 2008). "THE ONE HUNDRED NEAREST STAR SYSTEMS". RECONS. Retrieved June 17, 2008.
  6. Observed projected distance computed from parallax and observed angular distance.
  7. Chris Gelino, Davy Kirkpatrick, Adam Burgasser. "DwarfArchives.org: Photometry, spectroscopy, and astrometry of M, L, and T dwarfs". caltech.edu. Retrieved 2012-06-10.CS1 maint: multiple names: authors list (link) (main page)
  8. SCR J1845−6357B, entry, SIMBAD. Accessed on line June 17, 2008.
  • Hambly, Nigel C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Jao, Wei-Chun (2004). "The Solar Neighborhood. VIII. Discovery of New High Proper Motion Nearby Stars Using the SuperCOSMOS Sky Survey". The Astronomical Journal. 128 (1): 437–447. arXiv:astro-ph/0404265. Bibcode:2004AJ....128..437H. doi:10.1086/421748.
  • B.A. Biller et al., 2006, "Discovery of a Brown Dwarf Very Close to the Sun: A Methane-rich Brown Dwarf Companion to the Low-Mass Star SCR 1845-6357", Astrophysical Journal Letters.

See also
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