Astronomy:6 Sagittarii
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 01m 23.12190s[1] |
| Declination | −17° 09′ 24.7302″[1] |
| Apparent magnitude (V) | 6.27[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| B−V color index | 1.763±0.010[4] |
| Astrometry | |
| Radial velocity (Rv) | −22.0±4.3[2] km/s |
| Proper motion (μ) | RA: −0.86[1] mas/yr Dec.: −7.15[1] mas/yr |
| Parallax (π) | 1.24 ± 0.44[1] mas |
| Distance | approx. 2,600 ly (approx. 800 pc) |
| Details | |
| Mass | 10.6±1.9[5] M☉ |
| Luminosity | 6,816.79[6] L☉ |
| Temperature | 3,778[6] K |
| Age | 25.1±3.8[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
6 Sagittarii is a massive, orange-hued star in the southern zodiac constellation of Sagittarius. With an apparent visual magnitude of 6.27,[2] it is just below the nominal brightness limit for visibility with the typical naked eye under ideal viewing conditions. The distance can be estimated from the annual parallax shift of 1.24±0.44 mas[1] as roughly 2,600 light years away. It is moving closer to the Sun with a heliocentric radial velocity of −22 km/s.[2] 6 Sagittarii has a peculiar velocity of 31.8+9.9
−14.1 km/s, which may indicate it is a runaway star.[5]
This is an evolved giant star with a stellar classification of K2 III.[3] It is only 25[5] million years old and has around ten times the mass of the Sun.[5] The star is radiating about 6,817 times the Sun's luminosity from its photosphere at an effective temperature of 3,778 K.[6] It appears to be a source of extended infrared excess, but this emission may be due to intervening cirrus.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 3.0 3.1 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 5.2 5.3 5.4 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 6.0 6.1 6.2 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "6 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+Sgr.
- ↑ Plets, H. et al. (July 1997), "Giants with infrared excess", Astronomy and Astrophysics 323: 513–523, Bibcode: 1997A&A...323..513P.
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