| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18 01 23.12190 |
| Declination | −17° 09′ 24.7302″ |
| Apparent magnitude (V) | 6.27 |
| Characteristics | |
| Spectral type | K2 III |
| B−V color index | 1.763±0.010 |
| Astrometry | |
| Radial velocity (Rv) | −22.0±4.3 km/s |
| Proper motion (μ) | RA: −0.86 mas/yr Dec.: −7.15 mas/yr |
| Parallax (π) | 1.24 ± 0.44 mas |
| Distance | approx. 2,600 ly (approx. 800 pc) |
| Details | |
| Mass | 10.6±1.9 M☉ |
| Luminosity | 6,816.79 L☉ |
| Temperature | 3,778 K |
| Age | 25.1±3.8 Myr |
| Other designations | |
| 6 Sgr, BD−17° 4987, FK5 1470, HD 164358, HIP 88258, HR 6715, SAO 160998 | |
| 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, 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 as roughly 2,600 light years away. It is moving closer to the Sun with a heliocentric radial velocity of −22 km/s. 6 Sagittarii has a peculiar velocity of 31.8+9.9
−14.1 km/s, which may indicate it is a runaway star.
This is an evolved giant star with a stellar classification of K2 III. It is only 25 million years old and has around ten times the mass of the Sun. The star is radiating about 6,817 times the Sun's luminosity from its photosphere at an effective temperature of 3,778 K. It appears to be a source of extended infrared excess, but this emission may be due to intervening cirrus.
References
- ^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 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, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- "6 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-14.
- Plets, H.; et al. (July 1997), "Giants with infrared excess", Astronomy and Astrophysics, 323: 513–523, Bibcode:1997A&A...323..513P.
