World Library  
Flag as Inappropriate
Email this Article

Scr 1845-6357

Article Id: WHEBN0004491022
Reproduction Date:

Title: Scr 1845-6357  
Author: World Heritage Encyclopedia
Language: English
Subject: List of nearest stars and brown dwarfs, Pavo (constellation), HR 7722 c, 2MASS 1507-1627, Gliese 667 Cb
Publisher: World Heritage Encyclopedia

Scr 1845-6357

SCR 1845-6357, right bottom
Three-colour image of SCR1845-6357AB generated from the SDI filter images (blue=1.575 micrometre, green=1.600 micrometre, red=1.625 micrometre). 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 arcsecond on the sky (4.5 times the Earth-Sun distance).

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.

SCR 1845-6357 A

SCR 1845-6357A
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]
Spectral type M8.5[3]
Proper motion (μ) RA: 2444[2] mas/yr
Dec.: 696[2] mas/yr
Parallax (π) 259.45 ± 1.11[1] mas
Distance 12.57 ± 0.05 ly
(3.85 ± 0.02 pc)
Mass 0.07 [4] M
Radius 0.096 R
Luminosity 0.0004 L
Temperature 2600–2700[3] K
Other designations
DENIS-P J184504.9-635747, 2MASS J18450541-6357475, SCR J1845-6357,[2] SCR 1845A[3]

The primary, SCR 1845-6357A, is a faint (apparent magnitude 17.4)[2] red dwarf star with a mass of about 7% of the Sun's. However, the measurements are still preliminary and are subject to change.[4]

SCR 1845-6357 B

SCR 1845-6357B
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
4.10 ± 0.04 AU [5]
Spectral type T6 [3]
Apparent magnitude (J) 13.26[6]
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
Other designations
SCR J1845-6357B,[7] SCR 1845B[3]

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][5] The brown dwarf has a near-IR J band magnitude of 13.26.[6]


SCR 1845-6357 distance estimates
Source Parallax, mas Distance, pc Distance, ly Ref.
Deacon et al. (2005) 282 ± 23 3.55+0.31
Henry et al. (2006) 259.45 ± 1.11 3.854+0.017
12.57 ± 0.05 [1][9]
RECONS TOP100 (2012) 259.50 ± 1.11[note 1] 3.854+0.017
12.57 ± 0.05 [10]

Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.


  1. ^ a b c d 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".  
  2. ^ a b c d e DENIS-P J184504.9-635747, entry, SIMBAD. Accessed on line June 17, 2008.
  3. ^ a b c d e f g h i j k l 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. ^ a b  
  5. ^ a b Observed projected distance computed from parallax and observed angular distance.
  6. ^ a b Chris Gelino,   (main page)
  7. ^ SCR J1845-6357B, entry, SIMBAD. Accessed on line June 17, 2008.
  8. ^ Deacon, Niall R.; Hambly, Nigel C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Jao, Wei-Chun (2005). "The Solar Neighborhood. XI. The Trigonometric Parallax of SCR 1845-6357".  
  9. ^ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs".  
  10. ^ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-10-22. 
  • 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".  
  • 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.


  1. ^ Weighted parallax based on parallaxes from Deacon et al. (2005) and Henry et al. (2006).

External links

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

See also

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.