Delta Sagittarii
 |
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2012) |
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 20m 59.7s |
| Declination | -29° 49′ 41″ |
| Apparent magnitude (V) | +2.72 |
| Characteristics | |
| Spectral type | K3III |
| Astrometry | |
| Distance | 306 ± 27 ly (94 ± 8 pc) |
| Details | |
| Mass | 3.35 ± 0.34[1] M☉ |
| Radius | 129[1] R☉ |
| Surface gravity (log g) | 0.74 ± 0.10[1] |
| Luminosity | 2,500[1] L☉ |
| Temperature | 3,600 ± 300[1] K |
| Other designations | |
Delta Sagittarii (δ Sgr, δ Sagittarii) is a star system in the constellation Sagittarius. It has the traditional names Kaus Media, Kaus Meridionalis, and Media. Kaus Media is 306 light years from Earth and radiates with a total luminosity of 2,500 times that of the Sun. The radius of Delta Sgr is 129 times solar while its mass is about 3.4 times the solar mass.[1]
Kaus Media has an apparent magnitude of +2.72 and belongs to the spectral type K3. It has three dim companions:
- a 14th magnitude star at a separation of 26 arcseconds,
- a 15th magnitude star at a separation of 40 arcseconds, and
- a 13th magnitude star at a separation of 58 arcseconds from the primary.
It is not certain that these stars form a physical system or whether they are merely aligned by chance.
Contents |
[edit] Etymology
The name Kaus Media comes from the Arabic قوس qaws 'bow' and Latin media 'middle'.
In the Hindu system of astrology, this star is also called "Purvashada Nakshatra". In ancient Chinese astronomy, it is the 4th star of 6 stars in the Dipper or 'South Dipper' mansion of the Black Tortoise of the North.
[edit] See also
[edit] References
- ^ a b c d e f Schröder, K.-P.; Cuntz, M. (April 2007), "A critical test of empirical mass loss formulas applied to individual giants and supergiants", Astronomy and Astrophysics 465 (2): 593–601, Bibcode 2007A&A...465..593S, doi:10.1051/0004-6361:20066633
[edit] External links
|
|||||||||||||||||
