4 Sagittarii

4 Sagittarii
Location of 4 Sagittarii (circled)
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
Distance420 ± 30 ly
(127 ± 9 pc)
Absolute magnitude (MV)-0.77[2]
Details
Mass3.23[6] M☉
Luminosity240[6] L☉
Temperature9,661[6] K
Rotational velocity (v sin i)149[6] km/s
Other designations
CD-23°13731, FK5 3430, GC 24483, GSC 06841-01403, HIP 88116, HR 6700, HD 163955, SAO 186061
Database references
SIMBADdata

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. 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 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. Vizier catalog entry
  3. 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.
  4. 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
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. 1 2 3 4 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Vizier catalog entry
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