Gliese 783
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 20h 11m 11.94s [1] |
| Declination | –36° 06′ 04.4″ [1] |
| Apparent magnitude (V) | 5.31/11.5 |
| Characteristics | |
| Spectral type | K2 V/M3.5V |
| U−B color index | 0.46/? |
| B−V color index | 0.86/? |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | -129.8 km/s |
| Proper motion (μ) | RA: 456.99 ± 0.33 [1] mas/yr Dec.: -1574.64 ± 0.22 [1] mas/yr |
| Parallax (π) | 166.25 ± 0.27[1] mas |
| Distance | 19.62 ± 0.03 ly (6.015 ± 0.010 pc) |
| Absolute magnitude (MV) | 6.40/12.6 |
| Details | |
| Mass | 0.82/0.20 M☉ |
| Radius | 0.71/0.28 R☉ |
| Luminosity | 0.23/0.000077 L☉ |
| Temperature | ? K |
| Metallicity | 0.85/0.26 |
| Rotation | ? |
| Age | 7.7 × 109[2] years |
| Other designations | |
Gliese 783 (279 G. Sagittarii) is a binary star system in the constellation of Sagittarius. It is 19.87 light years from Earth, and it has an absolute magnitude of +5.32. In space, Gliese 783 is approaching the solar system at a velocity of approximately 140 kilometers per second. At this rate, it will be 6.7 light years away in 40,000 years, and ten times brighter than its current state. The two stars are separated by an angle of 7.1", corresponding to a distance of about 43 AUs.
References [edit]
- ^ a b c d e van Leeuwen, F. (2007). "HIP 99461". Hipparcos, the New Reduction. Retrieved 2009-12-12.
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal 687 (2): 1264–1293. arXiv:0807.1686. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785.
External links [edit]
- Indus and Pavo
- "J. Herschel 5173 AB". SolStation. Retrieved November 6, 2005.
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