Astronomy:SCR 1845−6357
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Short description: Star in the constellation Pavo
Coordinates: 
18h 45m 05.26s, −63° 57′ 47.8″
 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 (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 |
| Distance | 13.064 ± 0.007 ly (4.005 ± 0.002 pc) |
| Details | |
| SCR 1845−6357A | |
| Mass | 0.07[5] M☉ |
| Radius | 0.096 R☉ |
| Luminosity | 0.0004 L☉ |
| Temperature | 2600–2700[3] K |
| SCR 1845−6357B | |
| Mass | 0.04 to 0.05[3] M☉ |
| Surface gravity (log g) | 5.1[3] cgs |
| Temperature | 950[3] K |
| Age | 1.8×109 to 3.1×109[3] years |
| Position (relative to A) | |
| Epoch of observation | J2006.3 |
| Angular distance | 1.064 ± 0.004″ [3] |
| Position angle | 177.2 ± 0.06° [3] |
| Observed separation (projected) | 4.10 ± 0.04 AU [6] |
| Other designations | |
| Database references | |
| SIMBAD | A |
| B | |
  SCR 1845−6357 Location of SCR 1845−6357 in the constellation Pavo | |
SCR 1845−6357 is a binary system, 13.1 light-years (4.0 parsecs) 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.,[8] while the secondary brown dwarf was later discovered in 2006.[9]
System
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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]
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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.[4]
See also
References
- ↑ 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.
- ↑ 2.0 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.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 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.
- ↑ 4.0 4.1 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)
- ↑ 5.0 5.1 "THE ONE HUNDRED NEAREST STAR SYSTEMS". Georgia State University. January 1, 2008. http://www.astro.gsu.edu/RECONS/TOP100.posted.htm.
- ↑ 6.0 6.1 Observed projected distance computed from parallax and observed angular distance.
- ↑ 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.
- ↑ 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.
- ↑ 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.
External links
- New Objects within 20 light-years at SolStation.
- SCR 1845−6357
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