44 Ophiuchi

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44 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 44 Ophiuchi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ophiuchus
Right ascension 17h 26m 22.21749s [1]
Declination −24° 10 31.1190 [1]
Apparent magnitude  (V)4.16 [2]
Characteristics
Spectral type kA5hA9mF1III [3]
U−B color index +0.12 [4]
B−V color index +0.28 [4]
Astrometry
Radial velocity (Rv)−37.20 [5]  km/s
Proper motion (μ)RA: +0.10 [1]   mas/yr
Dec.: −118.18 [1]   mas/yr
Parallax (π)39.22 ± 0.24  mas [1]
Distance 83.2 ± 0.5  ly
(25.5 ± 0.2  pc)
Absolute magnitude  (MV)2.13 [2]
Details
Mass 1.77 [6]   M
Radius 1.9 [7]   R
Luminosity 13 [6]   L
Surface gravity (log g)4.15 [8]   cgs
Temperature 7,559 [8]   K
Metallicity [Fe/H]+0.30 [2]   dex
Rotational velocity (v sin i)78 [6]  km/s
Age 1.028 [8]   Gyr
Other designations
b Oph, 44 Oph, CD−24°13337, FK5  1457, GC  23597, GJ  9591, HD  157792, HIP  85340, HR  6486, SAO  185401 [9]
Database references
SIMBAD data

44 Ophiuchi is a single [10] 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. [2] The distance to this object is approximately 83.2  light years based on parallax. [1] It is drifting closer to the Earth with a heliocentric radial velocity of -37.2 km/s, [5] and is predicted to come within 30 light-years around 585,000 years from now. [11]

This is an Am star with a stellar classification of kA5hA9mF1III, [3] indicating it has the luminosity class of a giant star with a spectrum that matches an A5 star based on the calcium K line, and an A9 star from the hydrogen and metal lines. It is around a billion years old [8] with 1.77 [6] times the mass of the Sun and 1.9 [7] times the Sun's girth. The star is radiating 13 [6] times the Sun's luminosity from its photosphere at an effective temperature of 7,559 K. [8] It retains a moderately high rotation rate, showing a projected rotational velocity of 78 km/s. [6]

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<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">Sigma Ophiuchi</span> Star in the constellation Ophiuchus

Sigma Ophiuchi, Latinized from σ Ophiuchi, is a single, orange-hued star in the equatorial constellation Ophiuchus. Its apparent visual magnitude is 4.31, which is bright enough to be faintly visible to the naked eye. The annual parallax shift of 3.62 mas as seen from Earth provides a distance estimate of roughly 900 light years. It is moving closer to the Sun with a radial velocity of −28 km/s.

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

ι Ophiuchi, Latinized as Iota Ophiuchi, is a single star in the equatorial constellation of Ophiuchus, positioned near the constellation border with Hercules. It makes a naked-eye double with nearby Kappa Ophiuchi, appearing as a faint, blue-white hued star with an apparent visual magnitude of 4.39. The star is approximately 245 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −19 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.

<span class="mw-page-title-main">Beta Pavonis</span> Star in the constellation Pavo

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<span class="mw-page-title-main">Epsilon Pavonis</span> Star in the constellation Pavo

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<span class="mw-page-title-main">32 Persei</span> Star in the constellation Perseus

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<span class="mw-page-title-main">HD 222095</span> Single A-type main sequence star in the constellation of Phoenix

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<span class="mw-page-title-main">29 Persei</span> Star in the constellation Perseus

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References

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