109 Herculis

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109 Herculis
Observation data
Epoch J2000        Equinox J2000
Constellation Hercules
Right ascension 18h 23m 41.88967s [1]
Declination +21° 46′ 11.0854″ [1]
Apparent magnitude  (V)3.84 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type K2IIIab [4]
B−V color index 1.168±0.005 [5]
Astrometry
Radial velocity (Rv)−57.55±0.27 [6]  km/s
Proper motion (μ)RA: +196.027 [1]   mas/yr
Dec.: -241.709 [1]   mas/yr
Parallax (π)27.4579 ± 0.2258 [1]   mas
Distance 118.8 ± 1.0  ly
(36.4 ± 0.3  pc)
Absolute magnitude  (MV)+0.87 [7]
Details [8]
Mass 1.05±0.18  M☉
Radius 11.55+0.20
−0.19  R☉
Luminosity 56.9±0.5 [1]   L☉
Surface gravity (log g)2.24  cgs
Temperature 4,569±60  K
Metallicity [Fe/H]−0.06  dex
Rotational velocity (v sin i)4.4 [6]  km/s
Age 6.39±2.71  Gyr
Other designations
109 Her, BD+21°3411, FK5  690, HD  169414, HIP  90139, HR  6895, SAO  86003, WDS J18237+2146 [9]
Database references
SIMBAD data

109 Herculis is a single [10] star in the northern constellation of Hercules. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 3.84. [2] The star is located around 118.8 light-years (36.4 parsecs) distant, based on parallax. [1] It is moving closer to the Earth with a heliocentric radial velocity of −58 km/s, [6] and may come as close as 81 light-years away in around 328,000 years. [5]

This is an aging giant star with a stellar classification of K2IIIab. [4] It is a red clump giant, [3] meaning it on the horizontal branch and is generating energy through helium fusion at its core. The star is roughly six billion years old with slightly more mass than the Sun. [8] With the supply of hydrogen at its core exhausted, it has expanded to nearly 12 times the Sun's radius. [8] The star is radiating 57 [1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,569 K. [8]

This star, together with 93 Her, 95 Her, and 102 Her, were consist Cerberus, the obsolete constellation [11]

Related Research Articles

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Iota Cancri Star in the constellation Cancer

Iota Cancri is a double star in the constellation Cancer approximately 300 light years from Earth. It also has the name Decapoda.

6 Canum Venaticorum is a single star in the northern constellation Canes Venatici, located 246 light years from the Sun. It is visible to the naked eye as a faint yellow-hued star with an apparent visual magnitude of +5.01. The star is moving closer to the Earth with a heliocentric radial velocity of −4.2 km/s.

Delta Crateris Star in the constellation Crater

Delta Crateris is a solitary star in the southern constellation of Crater. With an apparent visual magnitude of 3.56, it is the brightest star in this rather dim constellation. It has an annual parallax shift of 17.56 mas as measured from Earth, indicating Delta Crateris lies at a distance of 163 ± 4 light years from the Sun.

15 Orionis Star system in the constellation Orion

15 Orionis is a suspected astrometric binary star system in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.82. The system is approximately 340 light years away from the Sun based on parallax. It is moving further from the Earth with a heliocentric radial velocity of +29 km/s, having come to within 69 light-years some three million years ago.

Eta Cygni Star in the constellation Cygnus

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4 Vulpeculae is a single, orange-hued star in the northern constellation of Vulpecula. It forms part of the asterism, formerly thought to be an open cluster, called the coathanger or Brocchi's Cluster. The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16. The distance to this star, based upon an annual parallax shift of 12.5320±0.1008 mas, is around 260 light years.

Theta Librae Star in the constellation Libra

θ Librae, Latinised as Theta Librae, is a single star in the southern zodiac constellation of Libra, near the constellation border with Scorpius. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.14. The distance to this star is approximately 168 light years, as determined by parallax, and it is drifting further away with a radial velocity of 5 km/s. The position of this star near the ecliptic means it is subject to lunar occultations.

30 Geminorum is a suspected astrometric binary star system in the northern zodiac constellation of Gemini. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.49. The distance to this star, as estimated through the use of parallax, is about 299 light years. It is drifting further away from the Sun with a heliocentric radial velocity of +9.5 km/s.

20 Monocerotis Star in the constellation Monoceros

20 Monocerotis is a single star located about 194 light years away from the Sun in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.92. The star is receding from the Earth with a heliocentric radial velocity of +78 km/s.

37 Tauri is a single, orange-hued star in the zodiac constellation of Taurus. It can be seen with the naked eye, having an apparent visual magnitude of 4.36. A magnitude 10.01 visual companion has an angular separation of 134.30″ on a position angle of 138.6°, as of 2003. Based on an annual parallax shift of 17.43±0.21 mas, 37 Tauri is about 187 light years away. It is moving further from the Sun with a heliocentric radial velocity of 9.5 km/s.

Phi Ophiuchi Star in the constellation Ophiuchus

Phi Ophiuchi, a name Latinized from φ Ophiuchi, is a single star in the equatorial constellation of Ophiuchus. It has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.27. The star is located at a distance of approximately 244 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −33.5 km/s.

51 Orionis Star in the constellation of Orion

51 Orionis is a single star in the equatorial constellation of Orion. It has the Bayer designation b Orionis, while 51 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90. It is located approximately 299 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +88 km/s.

35 Pegasi Star in the constellation of Pegasus

35 Pegasi is a single star in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.80. The star is located approximately 155 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +54 km/s. The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.318 arc seconds per annum.

Chi Pegasi Star in the constellation Pegasus

Chi Pegasi, Latinized from χ Pegasi, is a single star in the northern constellation of Pegasus, along the eastern constellation border with Pisces. It has a reddish hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.80. The distance to this star is approximately 368 light years based on parallax, but it is drifting closer with a radial velocity of -46 km/s.

19 Puppis Star in the constellation Puppis

19 Puppis is a binary star system in the southern constellation of Puppis, near the northern border with Hydra and Monoceros. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.72. The system is located approximately 177 light years away from the system based on parallax. It is receding from the Earth with a heliocentric radial velocity of +36 km/s, having come to within 31 light-years some 1.4 million years ago.

V1073 Scorpii

V1073 Scorpii is a variable star in the constellation Scorpius. It has a non-Greek Bayer designation of k Scorpii. The star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around +4.87. Parallax measurements yield a distance estimate of approximately 2,920 ly (896 pc) from the Sun, and it is drifting further away with a radial velocity of +7 km/s. It has an absolute magnitude of −6.8

75 Tauri is a single, orange-hued star in the zodiac of constellation Taurus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.96. Based upon an annual parallax shift of 17.47 mas as seen from Earth's orbit, it is located around 187 light years away. Due to its position near the ecliptic, it is subject to lunar occultations. The star is moving further from the Sun with a heliocentric radial velocity of +16 km/s.

69 Virginis is a single star in the zodiac constellation of Virgo, located about 259 light years away. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.76, although it is a suspected variable that may range in magnitude from 4.75 down to 4.79. This object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s. The light from this star is polarized due to intervening interstellar dust.

11 Serpentis is a single star in the constellation of Serpens, located 271 light years away from the Sun. It has the Bayer designation A1 Serpentis, 11 Serpentis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.497. It is moving closer to the Earth with a heliocentric radial velocity of −16 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 J. R., Ducati (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues, 2237, Bibcode:2002yCat.2237....0D.
  3. 1 2 Puzeras, E.; et al. (October 2010), "High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements", Monthly Notices of the Royal Astronomical Society , 408 (2): 1225–1232, arXiv: 1006.3857 , Bibcode:2010MNRAS.408.1225P, doi:10.1111/j.1365-2966.2010.17195.x, S2CID   44228180.
  4. 1 2 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. 1 2 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.
  6. 1 2 3 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209 .
  7. ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv: astro-ph/0409683 , Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID   12136256.
  8. 1 2 3 4 Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv: 1712.08109 , Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID   119427037.
  9. ↑ "109 Her". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-18.
  10. ↑ 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.
  11. ↑ Ian Ridpath's Star Tales - Cerberus
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