SCR 1845-6357
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Pavo |
| Right ascension | 18h 45m 02.6s |
| Declination | -63° 57' 48" |
| Apparent magnitude (V) | +17.39 |
| Characteristics | |
| Spectral type | M8.5 |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | ? km/s |
| Proper motion (μ) | RA: 2.664 mas/yr Dec.: 76.6 mas/yr |
| Parallax (π) | 259.45 ± 1.11 mas |
| Distance | 12.57 ± 0.05 ly (3.85 ± 0.02 pc) |
| Absolute magnitude (MV) | 19.41 |
| Details | |
| Mass | 0.07 M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
SCR 1845-6357 is a red dwarf star about 12.5 light-years away in the constellation Pavo. This star has a mass of about 7% of the Sun. However the measurements are still preliminary and are subject to change.
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Pavo |
| Right ascension | 18h 45m 02.6s |
| Declination | -63° 57' 48" |
| Apparent magnitude (V) | +17.39 |
| Characteristics | |
| Spectral type | T |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | ? km/s |
| Proper motion (μ) | RA: 2.664 mas/yr Dec.: 76.6 mas/yr |
| Parallax (π) | 259.45 ± 1.11 mas |
| Distance | 12.57 ± 0.05 ly (3.85 ± 0.02 pc) |
| Absolute magnitude (MV) | 19.41 |
| Details | |
| Mass | 0.062 M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
This star has been found to possess a brown dwarf companion, designated SCR 1845-6357 B. The companion, classified as a T-dwarf, orbits at a distance of 4.5 AU from the primary, has a mass between 9 and 65 times the mass of Jupiter, and an estimated effective temperature of 850K.
[edit] See also
[edit] References
- 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.
- [http://www.ifa.hawaii.edu/]
[edit] External links
- New Objects within 20 light-years at SolStation.
- VLT Finds Very Cool Brown Dwarf In The Neighborhood (SkyNightly) Mar 22, 2006
- [near-stars]
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