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SCR 1845-6357
From Wikipedia, the free encyclopedia
SCR 1845-6357, right bottom
SCR 1845-6357 is a binary system, about 12.6 light-years away in the constellation Pavo. The primary is a faint red dwarf star. It has a brown dwarf companion.
Contents |
SCR 1845-6357 A
| 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) | 259.45 ± 1.11[1] mas |
| Distance | 12.57 ± 0.05 ly (3.85 ± 0.02 pc) |
| Details | |
| Mass | 0.07 [4] M☉ |
| Radius | 0.096 R☉ |
| Luminosity | 0.0004 L☉ |
| Temperature | 2600-2700[3] K |
| Other designations | |
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
| 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 [5] |
| Characteristics | |
| Spectral type | T6 [3] |
| Details | |
| Mass | 0.04 to 0.05 [3] M☉ |
| Surface gravity (log g) | 5.1 [3] |
| Temperature | 950 [3] K |
| Age | 1.8·109 to 3.1·109 [3] years |
| Other designations | |
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]
References
- ^ a b c The Solar Neighborhood. XVII. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the RECONS 10 Parsec Sample, Todd J. Henry, Wei-Chun Jao, John P. Subasavage, Thomas D. Beaulieu, Philip A. Ianna, Edgardo Costa, and Rene A. Mendez, Astronomical Journal 132, #6 (December 2006), pp. 2360–2371. Bibcode: 2006AJ....132.2360H. doi:10.1086/508233.
- ^ a b c d e DENIS-P J184504.9-635747, entry, SIMBAD. Accessed on line June 17, 2008.
- ^ 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.
- ^ a b Research Consortium on Nearby Stars, Georgia State University (January 1, 2008). "THE ONE HUNDRED NEAREST STAR SYSTEMS". RECONS. http://www.chara.gsu.edu/RECONS/TOP100.posted.htm. Retrieved June 17 2008.
- ^ a b Observed projected distance computed from parallax and observed angular distance.
- ^ SCR J1845-6357B, entry, SIMBAD. Accessed on line June 17, 2008.
- Hambly, N.C., et al., 2005, "The Solar Neighborhood. VIII. Discovery of New High Proper Motion Nearby Stars Using the SuperCOSMOS Sky Survey", The Astronomical Journal, Vol. 128
- Deacon, Niall R. et al., 2005, "The Solar Neighborhood. XI. The Trigonometric Parallax of SCR 1845-6357", The Astronomical Journal, Vol. 129.
- 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.
External links
- New Objects within 20 light-years at SolStation.
- VLT Finds Very Cool Brown Dwarf In The Neighborhood (SkyNightly) Mar 22, 2006
- SCR 1845-6357
See also
| This main sequence star-related article is a stub. You can help Wikipedia by expanding it. |
| This binary or multiple star system-related article is a stub. You can help Wikipedia by expanding it. |
