Gamma Ophiuchi

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γ Ophiuchi
The 74 exocomet belts imaged by ALMA's REASONS survey, showing belts of all shapes, sizes and ages (REASONS comboplot full nonames).jpg
Image of the debris disk with the REASONS survey [1]
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Ophiuchus
Right ascension 17h 47m 53.55973s [2]
Declination +02° 42 26.2000 [2]
Apparent magnitude  (V)+3.753 [3]
Characteristics
Spectral type A0 V [4] or A1VnkA0mA0 [5]
U−B color index +0.040 [3]
B−V color index +0.033 [3]
Astrometry
Radial velocity (Rv)−7.6±0.3 [6]  km/s
Proper motion (μ)RA: −24.64 [2]   mas/yr
Dec.: −74.42 [2]   mas/yr
Parallax (π)31.73 ± 0.21  mas [2]
Distance 102.8 ± 0.7  ly
(31.5 ± 0.2  pc)
Absolute magnitude  (MV)+1.26 [6]
Details
Mass 2.9 [4]   M
Radius 1.8 [7]   R
Luminosity 29 [4]   L
Surface gravity (log g)4.03 [5]   cgs
Temperature 9,506 [4]   K
Rotational velocity (v sin i)220 [8]  km/s
Age 184+93
−134
[8]   Myr
Other designations
Muliphen [9] , γ Oph, 62 Ophiuchi, BD+19° 3564, FK5  668, GC  24162, HD  161868, HIP  87108, HR  6629, SAO  122754 [10]
Ophiuchus IAU.svg
Red circle.svg
Location of γ Ophiuchi (circled)
Database references
SIMBAD data

Gamma Ophiuchi, Latinized from γ Ophiuchi, is a fourth-magnitude star in the constellation Ophiuchus. Together with Beta Ophiuchi, it forms the serpent-holder's right shoulder. [11] The star is visible to the naked eye with an apparent visual magnitude of +3.75. [3] Based upon an annual parallax shift of 31.73  mas as seen from Earth, it is located 103  light years from the Sun. It is moving closer to the Sun with a radial velocity of −7.6 km/s. [6]

It is known also as Muliphen, [9] [12] although at least two more stars are known with this name: Gamma Canis Majoris (often spelled as Muliphein) and Gamma Centauri (often spelled as Muhlifain). [12]

This is an A-type main sequence star with a stellar classification of A0 V. [4] Gray et al. (2003) lists a classification of A1VnkA0mA0, [5] indicating it is of type A1 V with the calcium K-line and metallic lines of an A0 star. It is approximately 184 [8]  million years old and is spinning rapidly with a projected rotational velocity of 220 km/s. [8] Gamma Ophiuchi has nearly three times the mass of the Sun and 1.8 times the Sun's radius. [7] The star shines with 29 [4] times the luminosity of the Sun, which is being emitted from its outer atmosphere at an effective temperature of 9506 K. [4] It is radiating an excess emission of infrared, suggesting the presence of a circumstellar disk of dust at an orbital radius of 64  AU from the host star. [4]

Related Research Articles

<span class="mw-page-title-main">Beta Ophiuchi</span> Orange giant star in the constellation Ophiuchus

Beta Ophiuchi or β Ophiuchi, also named Cebalrai, is a star in the equatorial constellation of Ophiuchus. The apparent visual magnitude of this star is 2.7, which is readily visible to the naked eye even from urban skies. The distance to this star can be estimated using parallax measurements, yielding a value of 83.4 light-years from the Sun.

<span class="mw-page-title-main">Gamma Trianguli</span> Star in the constellation Triangulum

Gamma Trianguli is a star in the constellation Triangulum located approximately 112 light years from Earth. It has an apparent magnitude of +4.01 and forms an optical (line-of-sight) triple with Delta Trianguli and 7 Trianguli.

<span class="mw-page-title-main">15 Andromedae</span> Star in the constellation Andromeda

15 Andromedae, abbreviated 15 And, is a single, variable star in the northern constellation of Andromeda. 15 Andromedae is the Flamsteed designation, while its variable star designation is V340 And. Its apparent visual magnitude is 5.55, which indicates it is faintly visible to the naked eye. Its estimated distance from the Earth is 252 light years, and it is moving further away with a heliocentric radial velocity of 13 km/s.

Omicron Aurigae, Latinized from ο Aurigae, is the Bayer designation for an astrometric binary star system in the northern constellation of Auriga. With an apparent visual magnitude of 5.47, it is faintly visible to the naked eye. Based upon an annual parallax shift of 7.89 ± 0.84 mas, it is approximately 413 light-years distant from Earth. The star is a member of the Ursa Major stream of co-moving stars.

λ Ophiuchi, Latinized as Lambda Ophiuchi, is a triple star system in the equatorial constellation of Ophiuchus. It has the traditional name Marfik, which now applies exclusively to the primary component. The system is visible to the naked eye as a faint point of light with an apparent visual magnitude of 3.82. It is located approximately 173 light-years from the Sun, based on its parallax, but is drifting closer with a radial velocity of –16 km/s.

12 Ophiuchi is a variable star in the constellation Ophiuchus. No companions have yet been detected in orbit around this star, and it remains uncertain whether or not it possesses a dust ring.

<span class="mw-page-title-main">72 Ophiuchi</span> Binary star system in the constellation Ophiuchus

72 Ophiuchi is a binary star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint, white-hued point of light with a combined apparent visual magnitude of 3.73. It is located approximately 86.9 light years away from the Sun based on parallax, but is moving closer with a heliocentric radial velocity of -23.9 km/s.

<span class="mw-page-title-main">Theta Ophiuchi</span> Star in the constellation Ophiuchus

Theta Ophiuchi, Latinized from θ Ophiuchi, is a multiple star system in the equatorial constellation of Ophiuchus. It lies on the "right foot" of the serpent-bearer, just southwest of Kepler's Star, the nova of 1604. According to Richard H. Allen's Star Names: Their Lore and Meaning (1899), θ Oph together with ξ Oph formed the Sogdian Wajrik "the Magician", the Khorasmian Markhashik "the Serpent-bitten" and with η Oph the Coptic Tshiō, "the Snake", and Aggia, "the Magician". This star has an apparent visual magnitude of +3.3, making it readily visible to the naked eye. Based upon parallax measurements from the Hipparcos mission, it is roughly 436 light-years from Earth. It is 1.8 degrees south of the ecliptic and therefore subject to lunar occultations and less frequently occulted by a planet.

<span class="mw-page-title-main">Kappa Ophiuchi</span> Star in the constellation Ophiuchus

Kappa Ophiuchi, Latinized from κ Ophiuchi, is a star in the equatorial constellation Ophiuchus. It is a suspected variable star with an average apparent visual magnitude of 3.20, making it visible to the naked eye and one of the brighter members of this constellation. Based upon parallax measurements made during the Hipparcos mission, it is situated at a distance of around 91.5 light-years from Earth. The overall brightness of the star is diminished by 0.11 magnitudes due to extinction from intervening matter along the line of sight.

51 Ophiuchi is a single star located approximately 410 light years away from the Sun in the equatorial constellation of Ophiuchus, northwest of the center of the Milky Way. It is visible to the naked eye as a faint, blue-white point of light with an apparent visual magnitude of 4.81. The star is moving closer to the Earth with a heliocentric radial velocity of –12 km/s.

<span class="mw-page-title-main">Kappa Herculis</span> Star in the constellation Hercules

Kappa Herculis is an optical double star in the constellation of Hercules. The two components, Kappa Herculis A and B, were 27.3 arc seconds apart in 2000. Based on parallax measurements from the Hipparcos mission, κ Her A is about 113 parsecs from the Sun and κ Her B is 600 parsecs ; more recent parallax measurements suggest that B is around 5% more distant than A.

<span class="mw-page-title-main">Epsilon Herculis</span> Multiple star system in the constellation Hercules

Epsilon Herculis, Latinized from ε Herculis, is a fourth-magnitude multiple star system in the northern constellation of Hercules. The combined apparent visual magnitude of 3.9111 is bright enough to make this system visible to the naked eye. Based upon an annual parallax shift of 21.04 mas as seen from Earth, it is located 155 light years from the Sun. The system is moving closer to the Sun with a radial velocity of −25 km/s.

<span class="mw-page-title-main">Chi Ophiuchi</span> Star in the constellation Ophiuchus

Chi Ophiuchi, Latinized from χ Ophiuchi, is a variable star in the equatorial constellation of Ophiuchus. It has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.22. The distance to this object, as determined from parallax measurements, is approximately 500 light years, but it is moving closer to the Sun with a radial velocity of −19 km/s. This star is a proper motion member of the Upper Scorpius sub-group in the Scorpius–Centaurus OB association; the nearest such co-moving association of massive stars to the Sun.

<span class="mw-page-title-main">Mu Ophiuchi</span> Star in the constellation Ophiuchus

μ Ophiuchi, Latinized as Mu Ophiuchi, is a solitary, blue-white hued star in the equatorial constellation of Ophiuchus. It is visible to the naked as a faint point of light with an apparent visual magnitude of 4.62. This object is located approximately 760 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −18.5 km/s.

Tau3 Eridani, Latinized from τ3 Eridani, is a star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.10. Using the parallax method, the distance to this star can be estimated as 88.6 light years. In 2001 it was reported as a candidate Vega-like star, meaning it appears to radiate an infrared excess from an orbiting circumstellar disk. However, this has not been confirmed.

<span class="mw-page-title-main">44 Ophiuchi</span> Star in the constellation Ophiuchus

44 Ophiuchi is a single star in the constellation Ophiuchus. It has the Bayer designation b Ophiuchi, while 44 Ophiuchi is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.16. The distance to this object is approximately 83.2 light years based on parallax. It is drifting closer to the Earth with a heliocentric radial velocity of -37.2 km/s, and is predicted to come within 30 light-years around 585,000 years from now.

<span class="mw-page-title-main">45 Ophiuchi</span> Star in the constellation Ophiuchus

45 Ophiuchi is a single star in the equatorial constellation of Ophiuchus, along the southern border with Scorpius. It has the Bayer designation d Ophiuchi, while 45 Ophiuchi is the Flamsteed designation. In the past it had the designation Theta Telescopii. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.28. It is located approximately 111.6 light years away from the Sun based on parallax. The star is drifting further from the Earth with a heliocentric radial velocity of +38 km/s.

<span class="mw-page-title-main">Phi Ophiuchi</span> Single 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.

<span class="mw-page-title-main">66 Ophiuchi</span> Star in the constellation Ophiuchus

66 Ophiuchi is a binary variable star in the equatorial constellation of Ophiuchus. It has the variable star designation V2048 Ophiuchi, while 66 Ophiuchi is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued point of light with a baseline apparent visual magnitude of 4.60. It is located approximately 650 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −13 km/s. The star has a peculiar velocity of 13.1±3.2 km/s relative to its neighbors.

<span class="mw-page-title-main">58 Ophiuchi</span> Star in the constellation Ophiuchus

58 Ophiuchi is a single star in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.86. This object is approximately 57.6 light years away based on parallax, and is drifting further from the Earth with a heliocentric radial velocity of +10 km/s.

References

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