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Messier 55 is a globular cluster in the south of the constellation Sagittarius. It was discovered by Nicolas Louis de Lacaille in 1752 while observing from what today is South Africa. Starting in 1754, Charles Messier made several attempts to find this object from Paris but its low declination meant from there it rises daily very little above the horizon, hampering observation. He observed and catalogued it in 1778. The cluster can be seen with 50 mm binoculars; resolving individual stars needs a medium-sized telescope.
Epsilon Sagittarii, formally named Kaus Australis, is a binary star system in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of +1.85 makes it the brightest object in Sagittarius. Based upon parallax measurements, this star is around 143 light-years from the Sun.
Sigma Sagittarii, Latinized from σ Sagittarii; formally named Nunki, is the second-brightest star in the constellation of Sagittarius. It has an apparent magnitude of +2.05, making it readily visible to the naked eye. The distance to this star, determined using parallax measurements from the Hipparcos astrometry satellite, yields a value of approximately 228 light-years from the Sun.
Lambda Sagittarii, formally named Kaus Borealis, is a star in the southern constellation of Sagittarius. The star marks the top of the Archer's bow.
Delta Sagittarii, formally named Kaus Media, is a star in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of this star is +2.70, making it easily visible to the naked eye. Parallax measurements place the distance at roughly 348 light-years from the Sun.
Zeta Sagittarii is a triple star system and the third-brightest star in the constellation of Sagittarius after Kaus Australis and Nunki. Based upon parallax measurements, it is about 88 light-years from the Sun.
Gamma2 Sagittarii, formally named Alnasl, is a 3rd-magnitude star in the zodiac constellation of Sagittarius. The location of this star is in the handle of the Bow of Sagittarius the Centaur. It is approximately 32.6 parsecs from the Sun and has an apparent visual magnitude of +2.96, making it the seventh-brightest star in the constellation.
Eta Sagittarii is a binary star system in the southern zodiac constellation of Sagittarius. Based upon parallax measurements, it is located at a distance of 146 light-years from Earth. In India, where part of the constellation of Sagittarius represents an Elephant, this star forms the creature's tail.
HD 181342 is a star with an orbiting exoplanet in the constellation of Sagittarius. With an apparent magnitude of 7.55, it cannot be seen with the naked eye. Parallax measurements made by Gaia spacecraft put the star at a distance of 394 light-years away. It is drifting closer with a heliocentric radial velocity of radial_v −0.8 km/s.
References
- ESA (1997). "The Hipparcos and Tycho Catalogues" . Retrieved 2006-12-26.
- Kostjuk, N. D. (2002). "HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index" . Retrieved 2006-12-26.
- Roman, N. G. (1987). "Identification of a Constellation from a Position" . Retrieved 2006-12-26.
- Gould, B. A. "Uranometria Argentina". Reprinted and updated by Pilcher, F. Archived from the original on 2012-02-27. Retrieved 2010-07-16.
- "Naming Stars" . Retrieved 13 December 2017.
- 1 2 3 4 5 6 7 8 9 Knobel, E. B. (June 1895). "On a Catalogue of Stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society . 55 (8): 435. Bibcode:1895MNRAS..55..429K. doi: 10.1093/mnras/55.8.429 .
- 1 2 3 4 Star Name - R.H. Allen p.359
- ↑ Ian Ridpath's Startales - Sagittarius the Archer
