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 | |
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]
Gamma Scuti, Latinized from γ Scuti, is a single, white-hued star in the southern constellation of Scutum. The apparent visual magnitude of 4.67 indicates this is a dim star but visible to the naked eye. Based upon an annual parallax shift of 10.21 mas as seen from Earth, this star is located about 319 light years from the Sun. Currently it is moving towards the Solar System at 41 km/s, which means in 2.35 million years it will pass at just 20 ly (5.519 pc) distance, probably becoming the brightest star in the night sky, at magnitude −2.1, for a period.
ν Tauri, Latinized as Nu Tauri, is a single star in the zodiac constellation of Taurus. It is a white-hued star and is visible to the naked eye with an apparent visual magnitude of +3.91. This object is located 117 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −6 km/s. It is predicted to come to within roughly 18.4 ly of the Sun in around five million years.
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.
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.
Psi Ophiuchi, which is Latinized from ψ Ophiuchi, is a single star in the equatorial constellation of Ophiuchus, next to the western constellation border with Scorpius. It has an orange hue and is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.50. It is approximately 199 light-years from Earth, based on parallax.
68 Ophiuchi is a binary star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with an apparent visual magnitude of 4.42. The system is located around 89.69 parsecs (292.5 ly) distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +6 km/s.
Epsilon Hydri, Latinized from ε Hydri, is a single, blue-white hued star in the southern constellation of Hydrus. It is a faint star with an apparent visual magnitude of 4.12, but it can be seen with the naked eye. Measurements made by the Hipparcos spacecraft showed an annual parallax shift of 21.48 mas, which provides a distance estimate of 152 light years. The star is moving away from the Sun with a radial velocity of +13.6 km/s. It is a member of the Tucana-Horologium moving group, an association of stars that share a common motion through space.
Beta Octantis, Latinized from β Octantis, is a probable astrometric binary star system in the southern circumpolar constellation of Octans. It is faintly visible to the naked eye with an apparent visual magnitude of 4.13. Based upon an annual parallax shift of 21.85 mas as seen from Earth, it is located about 149 light years from the Sun. It is moving away from the Sun with a radial velocity of +19 km/s.
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.
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.
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.
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.
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.
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.
Beta Pavonis, Latinised from β Pavonis, is a single, white-hued star in the southern constellation of Pavo. It can be seen with the naked eye, having an apparent visual magnitude of 3.42. Based upon an annual parallax shift of 24.14 mas as seen from Earth, it is located 135 light-years from the Sun. It is moving away from the Sun with a radial velocity of +4 km/s. Beta Pavonis is a member of the Ursa Major Moving Group, a set of stars that share a similar motion through space.
Epsilon Pavonis, Latinized from ε Pavonis, is a single, white-hued star in the constellation Pavo. It can be viewed with the naked eye, having an apparent visual magnitude of 3.97. The annual parallax shift of 31.04 mas provides a distance estimate of 105 light years from the Sun. This star is a member of the proposed Argus Association, a young moving group of more than 60 stars associated with the IC 2391 cluster. Epsilon Pavonis is moving closer to the Sun with a radial velocity of −6.7 km/s.
Rho Pegasi, Latinized from ρ Pegasi, is a star in the northern constellation of Pegasus, near the southern constellation boundary with Pisces. This is a probable astrometric binary system, as determined by changes to the proper motion of the visible component. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.90. The system is located at a distance of approximately 274 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −10.6 km/s.
32 Persei is a single star located 149 light years away from the Sun in the northern constellation of Perseus. It has the Bayer designation of l Persei, while 32 Persei is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.96. It is moving closer to the Earth with a heliocentric radial velocity of −9 km/s, and is a member of the Sirius supercluster: a stream of stars that share a common motion through space.
HD 222095 is a single star in the southern constellation of Phoenix, near the western constellation border with Grus. It has a white hue and is visible to the naked eye with an apparent visual magnitude of 4.74. The star is located at a distance of is approximately 200 light years based on parallax, and it is drifting further away with a radial velocity of +3.4 km/s.
29 Persei is a single star in the northern constellation of Perseus, located approximately 640 light years away from the Sun based on parallax. It is visible to the naked eye as faint, blue-white hued star with an apparent visual magnitude of 5.16. This object is a member of the Alpha Persei Cluster.