SCR 1845-6357
 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). |
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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|---|---|
| Constellation | Pavo |
| Right ascension | 18h 45m 05.26s |
| Declination | −63° 57′ 47.8″ |
| Apparent magnitude (V) | 17.4 |
| Characteristics | |
| Spectral type | M8.5 |
| Astrometry | |
| Proper motion (μ) |
RA: 2444 mas/yr Dec.: 696 mas/yr |
| Parallax (π) | 259.45 ± 1.11mas |
| Distance | 12.57 ± 0.05 ly (3.85 ± 0.02 pc) |
| Details | |
| Mass | 0.07 M☉ |
| Radius | 0.096 R☉ |
| Luminosity | 0.0004 L☉ |
| Temperature | 2600–2700 K |
| Other designations | |
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DENIS-P J184504.9-635747, 2MASS J18450541-6357475, SCR J1845-6357, SCR 1845A
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| Database references | |
| SIMBAD | The system |
| A | |
| Position (relative to A) | |
|---|---|
| Epoch of observation | J2006.3 |
| Angular distance | 1.064 ± 0.004″ |
| Position angle | 177.2 ± 0.06° |
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Observed separation (projected) |
4.10 ± 0.04 AU |
| Characteristics | |
| Spectral type | T6 |
| Apparent magnitude (J) | 13.26 |
| Details | |
| Mass | 0.04 to 0.05 M☉ |
| Surface gravity (log g) | 5.1 cgs |
| Temperature | 950 K |
| Age | 1.8·109 to 3.1·109 years |
| Other designations | |
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SCR J1845-6357B, SCR 1845B
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| Database references | |
| SIMBAD | B |
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.
The primary, SCR 1845-6357A, is a faint (apparent magnitude 17.4)red dwarf with a mass of about 7% of the Sun's. However, the measurements are still preliminary and are subject to change.
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. The brown dwarf has a near-IR J-band magnitude of 13.26.
Artist's impression of the SCR 1845-6357 stellar system.
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