4 Sagittarii
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sagittarius |
Right ascension | 17h 59m 47.55508s[1] |
Declination | −23° 48′ 58.0876″[1] |
Apparent magnitude (V) | 4.74[2] |
Characteristics | |
Spectral type | B9V[3] |
U−B color index | -0.03[4] |
B−V color index | -0.05[4] |
Astrometry | |
Radial velocity (Rv) | -18.00[5] km/s |
Proper motion (μ) | RA: -2.59[1] mas/yr Dec.: -51.07[1] mas/yr |
Parallax (π) | 7.85 ± 0.56[1] mas |
Distance | 420 ± 30 ly (127 ± 9 pc) |
Absolute magnitude (MV) | -0.77[2] |
Details | |
Mass | 3.23[6] M☉ |
Luminosity | 240[6] L☉ |
Temperature | 9,661[6] K |
Rotational velocity (v sin i) | 149[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
4 Sagittarii (4 Sgr) is a class B9V[3] (blue main-sequence) star in the constellation Sagittarius. Its apparent magnitude is 4.74[2] and it is approximately 420 light years away based on parallax.[1]
References
- 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. Vizier catalog entry
- 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971 . doi:10.1134/S1063773712050015. Vizier catalog entry
- 1 2 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- 1 2 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 3 4 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. Bibcode:2012A&A...537A.120Z. arXiv:1201.2052 . doi:10.1051/0004-6361/201117691. Vizier catalog entry
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