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SCR 1845−6357

SCR 1845−6357Location of SCR 1845−6357 in the constellation Pavo
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Pavo
Right ascension	18 45 05.25325
Declination	−63° 57′ 47.4501″
Apparent magnitude (V)	17.4
Characteristics
SCR 1845−6357A
Spectral type	M8.5
SCR 1845−6357B
Spectral type	T6
Apparent magnitude (J)	13.26
Astrometry
Proper motion (μ)	RA: 2583.190 mas/yr Dec.: 588.504 mas/yr
Parallax (π)	249.6651 ± 0.1330 mas
Distance	13.064 ± 0.007 ly (4.005 ± 0.002 pc)
Details
SCR 1845−6357A
Mass	0.0753±0.0088 M☉
Radius	0.0941±0.0039 R☉
Luminosity	(2.649±0.026)×10 L☉
Surface gravity (log g)	5.0 cgs
Temperature	2,400 K
SCR 1845−6357B
Mass	0.024 to 0.062 M☉
Mass	25 to 65 MJup
Radius	0.7±0.1 RJup
Luminosity	5.25+1.06 −0.88×10 L☉
Surface gravity (log g)	5.1 cgs
Temperature	1,000±100 K
Age	≥1.5 Gyr
Position (relative to A)
Epoch of observation	J2006.3
Angular distance	1.064 ± 0.004″
Position angle	177.2 ± 0.06°
Projected separation	4.10 ± 0.04 AU
Other designations
GJ 12724, SCR J1845-6357, 2MASS J18450541-6357475, DENIS J184504.9-635747, SCR 1845
Database references
SIMBAD	A
	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, while the secondary is a brown dwarf. It is among the nearest stars, as well as the nearest red dwarf-brown dwarf binary.

System

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). It is very faint, at an apparent magnitude of 17.4 due to its low luminosity, equivalent to 0.03% of the Sun's luminosity across all wavelengths. It was discovered in 2004 by the SuperCOSMOS survey.

This star has been found to have a brown dwarf companion in 2006, designated SCR 1845-6357 B. The companion has an observed distance of 4.1 AU from the primary and is classified as a T-dwarf. It is estimated to have between 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).

Gallery

• Artist's impression of the SCR 1845-6357 stellar system
• 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).

See also

• OTS 44
• Cha 110913−773444

References

1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. ^ "SCR J1845-6357". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 November 2023.
3. ^ 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. arXiv:0706.3824. Bibcode:2007A&A...471..655K. doi:10.1051/0004-6361:20077881.
4. Chris Gelino; Davy Kirkpatrick; Adam Burgasser. "DwarfArchives.org: Photometry, spectroscopy, and astrometry of M, L, and T dwarfs". caltech.edu. Archived from the original on 2013-11-13. Retrieved 2012-06-10. (main page) Archived 2019-05-11 at the Wayback Machine
5. ^ Cifuentes, C.; Caballero, J. A.; Cortés-Contreras, M.; Montes, D.; Abellán, F. J.; Dorda, R.; Holgado, G.; Zapatero Osorio, M. R.; Morales, J. C.; Amado, P. J.; Passegger, V. M.; Quirrenbach, A.; Reiners, A.; Ribas, I.; Sanz-Forcada, J. (2020-10-01). "CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions". Astronomy and Astrophysics. 642: A115. arXiv:2007.15077. Bibcode:2020A&A...642A.115C. doi:10.1051/0004-6361/202038295. ISSN 0004-6361. SCR 1845-6357 A's database entry at VizieR.
6. ^ Vigan, A.; Bonnefoy, M.; Chauvin, G.; Moutou, C.; Montagnier, G. (2012-04-01). "High-contrast spectroscopy of SCR J1845-6357 B". Astronomy & Astrophysics. 540: A131. arXiv:1204.0241. doi:10.1051/0004-6361/201118426. ISSN 0004-6361.
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. arXiv:2211.01449. Bibcode:2023A&A...670A..19G. doi:10.1051/0004-6361/202244250. S2CID 253264922. 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. arXiv:astro-ph/0404265. Bibcode:2004AJ....128..437H. doi:10.1086/421748. S2CID 9586813.
10. Biller, B. A.; Kasper, M.; 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. arXiv:astro-ph/0601440. Bibcode:2006ApJ...641L.141B. doi:10.1086/504256.

External links

• New Objects within 20 light-years at SolStation.
• SCR 1845−6357

v t e Constellation of Pavo
List of stars in Pavo Pavo in Chinese astronomy
Stars	Bayer α (Peacock) β γ δ ε ζ η θ ι κ λ μ μ ν ξ ο π ρ σ τ υ φ φ ω Variable R V X Y SX AR BD KZ MW NU NZ V346 V347 HR 6586 6624 6634 6740 6760 6796 6805 6808 6828 6899 6908 6939 6996 7004 7012 7015 7022 7027 7111 7130 7161 7221 7278 7320 7383 7434 7435 7455 7498 7513 7527 7531 7558 7579 7587 7588 7644 7663 7691 7707 7732 7838 7872 7959 8019 8061 8073 8081 8125 8159 HD 161475 162521 164427 175007 175167 176522 179419 181433 186302 190984 192887 195190 195772 196050 Other Gliese 693 SCR 1845−6357 SCR 1826−6542
Exoplanets HD 175167 b HD 181433 b c d HD 190984 b HD 196050 b
Galaxies	NGC 6744 6753 6782 6810 6872 7020 7032 7059 Other Bedin I IC 4662 IC 4687 IC 4710 IC 4970 IC 5052 IRAS 19254-7245
Galaxy clusters NGC 6752
Category

• Local Bubble
• Pavo (constellation)
• M-type main-sequence stars
• T-type brown dwarfs
• Binary stars
• 2MASS objects