Astronomy:SCR 1845−6357

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Short description: Star in the constellation Pavo

Coordinates: Sky map 18h 45m 05.26s, −63° 57′ 47.8″

SCR 1845−6357
SCR 1845−6357 is located in the constellation Pavo.
SCR 1845−6357 is located in the constellation Pavo.
SCR 1845−6357
Location of SCR 1845−6357 in the constellation Pavo

Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Pavo
Right ascension  18h 45m 05.25325s[1]
Declination −63° 57′ 47.4501″[1]
Apparent magnitude (V) 17.4[2]
Characteristics
SCR 1845−6357A
Spectral type M8.5[3]
SCR 1845−6357B
Spectral type T6[3]
Apparent magnitude (J) 13.26[4]
Astrometry
Proper motion (μ) RA: 2583.190[1] mas/yr
Dec.: 588.504[1] mas/yr
Parallax (π)249.6651 ± 0.1330[1] mas
Distance13.064 ± 0.007 ly
(4.005 ± 0.002 pc)
Details
SCR 1845−6357A
Mass0.0753±0.0088[5] M☉
Radius0.0941±0.0039[5] R☉
Luminosity(2.649±0.026)×10−4[5] L☉
Surface gravity (log g)5.0[5] cgs
Temperature2,400[5] K
SCR 1845−6357B
Mass0.024 to 0.062[6] M☉
Mass25 to 65[6] MJup
Radius0.7±0.1[6] RJup
Luminosity5.25+1.06
−0.88×10−6[6] L☉
Surface gravity (log g)5.1[3] cgs
Temperature1,000±100[6] K
Age≥1.5[6] Gyr
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 [7]
Other designations
GJ 12724[8], SCR J1845−6357, 2MASS J18450541-6357475, DENIS J184504.9-635747,[2] SCR 1845[3]
Database references
SIMBADA
B

SCR 1845−6357 is a binary system, 13.1 light-years (4.0 parsecs) away in the constellation Pavo. The primary is a low-mass red dwarf and the secondary is a brown dwarf. It is one of the nearest stellar systems, as well as the closest red dwarf-brown dwarf binary.

System

Size comparison of SCR 1845−6357 A and B, compared to Solar System objects

The primary, SCR 1845−6357A, is an ultra-cool red dwarf, one of the smallest and coolest stars so far discovered, with a mass of about 7% of the Sun's, a radius 9.4% of the Sun's, and an effective temperature of 2,400 K (2,100 °C; 3,900 °F).[5] It is very faint, at an apparent magnitude of 17.4[2] due to its low luminosity, equivalent to 0.03% of the Sun's luminosity across all wavelengths.[6] It was discovered in 2004 by the SuperCOSMOS survey.[9]

This star has been found to have a brown dwarf companion in 2006, designated SCR 1845−6357 B.[10] The companion has an observed distance of 4.1 AU from the primary and is classified as a T-dwarf.[3] It is estimated to have 25 to 65 times the mass of Jupiter (2.4 to 6.2% of the Sun's mass), but its radius is 30% smaller than that of Jupiter, about 50,000 km (31,000 miles). It has an effective temperature around 1,000 K (730 °C; 1,300 °F).[6]

  • Artist's impression of the SCR 1845−6357 stellar system
    Artist's impression of the SCR 1845−6357 stellar system
  • SCR 1845−6357, right bottom
    SCR 1845−6357, right bottom
  • 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).
    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).

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 "SCR J1845-6357". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=SCR+J1845-6357. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Kasper, Markus; Biller, Beth A.; Burrows, Adam; Brandner, Wolfgang; Budaj, Jano; Close, Laird M. (August 2007). "The very nearby M/T dwarf binary SCR 1845-6357". Astronomy and Astrophysics 471 (2): 655–659. doi:10.1051/0004-6361:20077881. Bibcode: 2007A&A...471..655K. 
  4. ↑ Chris Gelino; Davy Kirkpatrick. "DwarfArchives.org: Photometry, spectroscopy, and astrometry of M, L, and T dwarfs". caltech.edu. http://ldwarf.ipac.caltech.edu/archive/version5/viewlist.php?table=ltdwarf&format=text.  (main page)
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Cifuentes, C.; Caballero, J. A.; Cortés-Contreras, M.; Montes, D.; Abellán, F. J.; Dorda, R.; Holgado, G.; Zapatero Osorio, M. R. et al. (2020-10-01). "CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions". Astronomy and Astrophysics 642: A115. doi:10.1051/0004-6361/202038295. ISSN 0004-6361. Bibcode: 2020A&A...642A.115C.  SCR 1845-6357 A's database entry at VizieR.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Vigan, A.; Bonnefoy, M.; Chauvin, G.; Moutou, C.; Montagnier, G. (2012-04-01). "High-contrast spectroscopy of SCR J1845-6357 B" (in en). Astronomy & Astrophysics 540: A131. doi:10.1051/0004-6361/201118426. ISSN 0004-6361. Bibcode: 2012A&A...540A.131V. 
  7. ↑ Observed projected distance computed from parallax and observed angular distance.
  8. ↑ Golovin, Alex; Reffert, Sabine; Just, Andreas; Jordan, Stefan; Vani, Akash; Jahreiß, Hartmut (November 2022). "The Fifth Catalogue of Nearby Stars (CNS5)". Astronomy & Astrophysics 670: A19. doi:10.1051/0004-6361/202244250. Bibcode: 2023A&A...670A..19G.  Catalogue can be accessed here.
  9. ↑ 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. doi:10.1086/421748. Bibcode: 2004AJ....128..437H. 
  10. ↑ Biller, B. A. et al. (April 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". The Astrophysical Journal 641 (2): L141–L144. doi:10.1086/504256. Bibcode: 2006ApJ...641L.141B. 



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