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

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

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