HD 189831

Last updated
HD 189831
Observation data
Epoch J2000       Equinox J2000
Constellation Sagittarius
Right ascension  20h 03m 33.45912s [1]
Declination −37° 56′ 26.5236″ [1]
Apparent magnitude  (V)4.77 [2]
Characteristics
Spectral type K5III [3]
U−B color index +1.68 [4]
B−V color index +1.41 [4]
Astrometry
Radial velocity (Rv)-38.30 [5]  km/s
Proper motion (μ)RA: +64.47 [1]   mas/yr
Dec.: -86.43 [1]   mas/yr
Parallax (π)8.90 ± 0.29 [1]   mas
Distance 370 ± 10  ly
(112 ± 4  pc)
Absolute magnitude  (MV)-0.48 [2]
Details
Luminosity 316 [2]   L☉
Temperature 4,099 [6]   K
Rotational velocity (v sin i)< 1.0 [7]  km/s
Other designations
CD-38°13828, FK5  3602, GC  27779, GSC  07947-03890, HIP  98761, HR  7652, HD  189831, SAO  211767
Database references
SIMBAD data

HD 189831 is a class K5III [3] (orange giant) star in the constellation Sagittarius. Its apparent magnitude is 4.77 [2] and it is approximately 366 light years away based on parallax. [1]

Star Astronomical object

A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable Universe contains an estimated 1×1024 stars, but most are invisible to the naked eye from Earth, including all stars outside our galaxy, the Milky Way.

Constellation Group of stars

A constellation is a group of stars that forms an imaginary outline or pattern on the celestial sphere, typically representing an animal, mythological person or creature, a god, or an inanimate object.

Sagittarius (constellation) Zodiac constellation in the southern celestial hemisphere

Sagittarius is one of the constellations of the zodiac. It is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Its name is Latin for the archer, and its symbol is , a stylized arrow. Sagittarius is commonly represented as a centaur pulling back a bow. It lies between Scorpius and Ophiuchus to the west and Capricornus and Microscopium to the east.

Related Research Articles

X Sagittarii variable star

X Sagittarii is a bright giant Cepheid variable star in the constellation Sagittarius.

Delta Octantis star in the constellation Octans

δ Octantis, Latinised as Delta Octantis, has the distinction of being Saturn's southern pole star. An orange giant of class K2III, it has 1.2 times the mass of the Sun and about 25 times the Sun's radius. This star is about 4.3 billion years old, which is similar to the age of the Sun.

28 Monocerotis is a class K4III star in the constellation Monoceros. Its apparent magnitude is 4.69 and it is approximately 450 light years away based on parallax.

Phi Ophiuchi star in the constellation Ophiuchus

Phi Ophiuchi is a class G8+IIIa star in the constellation Ophiuchus. Its apparent magnitude is 4.27 and it is approximately 244 light years away based on parallax.

30 Ophiuchi star in the constellation Ophiuchus

30 Ophiuchi is a single star in the equatorial constellation of Ophiuchus, and is positioned 1° east-southeast of Messier 10. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.82. The distance to this star is approximately 350 light years based on parallax. It is drifting closer to the Earth with a heliocentric radial velocity of −6.7 km/s.

HD 40657 star

HD 40657 is a class K1.5III star in the constellation Orion. Its apparent magnitude is 4.52 and it is approximately 420 light years away based on parallax.

17 Persei star in the constellation Perseus

17 Persei is a single star in the northern constellation of Perseus, located about 390 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.53. This object is moving further from the Earth at a heliocentric radial velocity of +13 km/s.

HD 18970 star

HD 18970 is a class G9.5III star in the constellation Perseus. Its apparent magnitude is 4.77 and it is approximately 211 light years away based on parallax.

Gamma Pictoris star in the constellation Pictor

Gamma Pictoris, Latinized from γ Pictoris, is a single, orange-hued star in the southern constellation of Pictor. It is a faintly visible to the naked eye with an apparent visual magnitude of 4.50. Based upon an annual parallax shift of 18.45 mas as seen from Earth, this star is located about 177 light years from the Sun. It is moving away from the Sun with a radial velocity of +15.7 km/s.

HD 69142 star

HD 69142 is a class K1II-III star in the constellation Puppis. Its apparent magnitude is 4.44 and it is approximately 298 light years away based on parallax.

HD 63744 star

HD 63744 is a class K0III star in the constellation Puppis. Its apparent magnitude is 4.71 and it is approximately 232 light years away based on parallax.

HD 70555 star

HD 70555 is a class K2.5II-III star in the constellation Puppis. Its apparent magnitude is 4.83 and it is approximately 1,010 light years away based on parallax.

HD 53811 star

HD 53811 is a class A4IV star in the constellation Puppis. Its apparent magnitude is 4.92 and it is approximately 198 light years away based on parallax.

HD 61772 star

HD 61772 is a class K3II star in the constellation Puppis. Its apparent magnitude is 4.98 and it is approximately 700 light years away based on parallax.

HD 50235 star

HD 50235 is a class K5III star located approximately 811 light years away, in the constellation Puppis. Its apparent magnitude is 4.99. HD 50235 made its closest approach to the Sun 7.8 million years ago, at the distance of 137 light years, during which it had an apparent magnitude of 1.13.

HD 165634 star

HD 165634 is a class G7III star in the constellation Sagittarius. Its apparent magnitude is 4.56 and it is approximately 339 light years away based on parallax.

HD 167818 star in the constellation Sagittarius

HD 167818 is a class K3II star in the constellation Sagittarius. Its apparent magnitude is 4.66 and it is approximately 760 light years away based on parallax.

Theta<sup>2</sup> Microscopii star in the constellation Microscopium

Theta2 Microscopii is a class A0III star in the constellation Microscopium. Its apparent magnitude is 5.76 and it is approximately 390 light years away based on parallax. It is an Ap star, a chemically peculiar star with unusually strong metallic spectral lines.

HD 42540 star

HD 42540, also known as HR 2196, is a suspected variable star in the constellation Pictor. A class K2-3III orange giant, its apparent magnitude is 5.04 and it is approximately 362 light years away based on parallax.

Gamma<sup>1</sup> Octantis star in the constellation Octans

Gamma1 Octantis, Latinized from γ1 Octantis, is a single, yellow-hued star in the constellation which takes in the southern pole, Octans. Its apparent visual magnitude is 5.10.

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 4 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. ↑ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN   54001336.
  6. ↑ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv: 1605.07384 . Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  7. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry


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