HD 177808

Last updated
HD 177808
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Lyra
Right ascension 19h 04m 57.87462s [1]
Declination +31° 44 38.6538 [1]
Apparent magnitude  (V)5.63 [2]
Characteristics
Spectral type M0III [3]
B−V color index 1.548±0.003 [2]
Astrometry
Radial velocity (Rv)3.47±0.14 [2]  km/s
Proper motion (μ)RA: +74.989 [1]   mas/yr
Dec.: −76.884 [1]   mas/yr
Parallax (π)5.9150 ± 0.0831  mas [1]
Distance 551 ± 8  ly
(169 ± 2  pc)
Absolute magnitude  (MV)−0.75 [2]
Details
Radius 42.27+1.26
−4.39
[1]   R
Luminosity 387.9±6.8 [1]   L
Temperature 3,940+233
−58
[1]   K
Other designations
BD+31°3453, GC  26266, HD  177808, HIP  93718, HR  7237, SAO  67782 [4]
Database references
SIMBAD data

HD 177808 is a 6th magnitude star in the constellation Lyra, approximately 610 light years away from Earth. It is a solitary [5] red giant star of the spectral type M0III, meaning it possesses a surface temperature of around 3,940 kelvins. It is therefore much larger and brighter than the Sun, yet cooler in comparison.

Related Research Articles

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<span class="mw-page-title-main">HD 92063</span> Star in the constellation Carina

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<span class="mw-page-title-main">HD 102964</span> Star in the constellation Centaurus

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HD 172044 is a triple star system in the northern constellation of Lyra. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 5.41. The distance to the primary component is approximately 535 light years based on parallax. It is drifting closer with a radial velocity of −32.5 km/s, and is predicted to come as near as 77.3 light-years to the Sun some 4.5 million years from now.

HD 75710 is a single star in the constellation of Vela. It has an apparent visual magnitude of approximately 4.94, which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 2.7 mas, it is located about 1,200 light-years from the Sun.

HD 35520 is a single star in the northern constellation of Auriga. It has a white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.92. The distance to this star is approximately 2,200 light years based on parallax. The radial velocity for the star is, as yet, poorly constrained.

HD 189276 is a single star in the northern constellation Cygnus, positioned near the northern constellation border with Draco. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.98. The star is located at a distance of approximately 820 light years from the Sun based on parallax, and it has an absolute magnitude of −2.25. It is drifting further away with a radial velocity of +4 km/s. The star has a high peculiar velocity of 38.5+1.8
−2.2
 km/s
and thus is a probable runaway star.

HD 102350 is a single star in the constellation Centaurus. It has a yellow hue and is visible to the naked eye with an apparent visual magnitude of 4.11. The distance to this star is approximately 390 light years based on parallax, but it is drifting closer with a radial velocity of −3 km/s. It has an absolute magnitude of −1.51.

HD 143009 is a single star in the southern constellation of Lupus. It has an orange hue and is visible to the naked eye with an apparent visual magnitude of 4.99. The star lies at a distance of approximately 380 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −27 km/s. It has an absolute magnitude of −0.64.

HD 163145 is a single star in the constellation Scorpius, near the southeast constellation border with Corona Australis. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.85. Based on parallax measurements, it is located at a distance of approximately 307 light years from the Sun. The star is drifting further away with a radial velocity of +35.6 km/s, having come to within 49.2 light-years of the Sun some 1.871 million years ago. It has an absolute magnitude of 0.12.

HD 163376 is a single star in the southern constellation of Scorpius. It has a ruddy hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.88. The distance to this star, as determined using parallax measurements, is approximately 450 light years. It is drifting further from the Sun with a radial velocity of about 4 km/s. The absolute magnitude of this star is −0.82.

HD 79917 is a single star in the southern constellation of Vela. It has the Bayer designation l Velorum, while HD 79917 is the star's identifier from the Henry Draper Catalogue. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.92. It is located at a distance of approximately 228 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +1.6 km/s.

η Microscopii, Latinised as Eta Microscopii, is a solitary star in the constellation Microscopium. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.53. The star is located around 910 light-years distant from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s.

References

  1. 1 2 3 4 5 6 7 8 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  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, S2CID   119257644.
  3. Roman, Nancy G. (December 1955), "A Catalogue of High-Velocity Stars", The Astrophysical Journal Supplement Series, 2: 195, Bibcode:1955ApJS....2..195R, doi: 10.1086/190021 , ISSN   0067-0049.
  4. "HD 177808". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-02-10.
  5. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID   14878976.