17 Eridani

Last updated
17 Eridani
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Eridanus
Right ascension 03h 30m 37.05823s [1]
Declination −05° 04 30.5239 [1]
Apparent magnitude  (V)4.74 [2]
Characteristics
Evolutionary stage main sequence [3]
Spectral type B9 III [4] or B9Vs [5]
B−V color index −0.092±0.008 [2]
Astrometry
Radial velocity (Rv)+15.0±4.2 [2]  km/s
Proper motion (μ)RA: 14.23 [1]   mas/yr
Dec.: 7.27 [1]   mas/yr
Parallax (π)8.07 ± 0.20  mas [1]
Distance 400 ± 10  ly
(124 ± 3  pc)
Absolute magnitude  (MV)−0.72 [2]
Details
Mass 3.55±0.04 [3]   M
Radius 3.2 [6]   R
Luminosity 267.9+15.2
−14.4
[3]   L
Surface gravity (log g)3.603±0.017 [7]   cgs
Temperature 11,143±51 [3]   K
Rotational velocity (v sin i)86 [3]  km/s
Age 178+10
−9
[8]   Myr
Other designations
v Eri, 17 Eri, BD−05°674, HD  21790, HIP  16341, HR  1070, SAO  130528 [9]
Database references
SIMBAD data

17 Eridani is a single [10] star in the equatorial constellation of Eridanus. It has the Bayer designation v Eridani, while 17 Eridani is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.74. [2] It is moving further from the Earth with a heliocentric radial velocity of around +15 km/s. [2]

Houk and Swift (1999) found a stellar classification of B9 III [4] for this star, while Cowley et al. (1969) show B9 Vs. [5] Stellar models suggest this is a main-sequence star, [3] which indicates it is generating energy through hydrogen fusion at its core. It is about 178 [8]  million years old with 3.55 [3] times the mass of the Sun and around 3.2 [6] times the size of the Sun. The star is radiating 268 [3] times the Sun's luminosity from its photosphere at an effective temperature of 11,143  K . [3] These coordinates are a source for X-ray emission, which may be coming from an unresolved companion. [7]

Related Research Articles

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Psi Scorpii, which is Latinized from ψ Scorpii, is a star in the zodiac constellation of Scorpius. It is white in hue and has an apparent visual magnitude of 4.94, which is bright enough to be faintly visible to the naked eye. Based upon parallax measurements, it is located at a distance of around 162 light years from the Sun. Data collected during the Hipparcos mission suggests it is an astrometric binary, although nothing is known about the companion. The system is drifting closer to the Sun with a radial velocity of −5 km/s.

Pi Tucanae is a double star in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.49. Based upon an annual parallax shift of 10.25 mas as seen from Earth, it is located around 317 light years from the Sun.

<span class="mw-page-title-main">Tau Virginis</span> Star in the constellation Virgo

Tau Virginis is a single star in the zodiac constellation Virgo. With an apparent visual magnitude of 4.28, it is faintly visible to the naked eye. The distance to Tau Virginis, based upon parallax measurements, is approximately 225 light years with a margin of error of ±3 light years.

Tau<sup>1</sup> Aquarii Star in the constellation Aquarius

Tau1 Aquarii, Latinized from τ1 Aquarii, is the Bayer designation for a single star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 5.66, it is a faint naked eye that requires dark suburban skies for viewing. Parallax measurements made during the Hipparcos mission yield a distance estimate of roughly 355 light-years from Earth. The star is drifting further away with a radial velocity of +15 km/s. It is a candidate member of the Pisces-Eridanus stellar stream.

Nu Arietis, Latinized from ν Arietis, is the Bayer designation for a white-hued star in the northern constellation of Aries. It is faintly visible to the naked eye with an apparent visual magnitude of +5.43. Based upon an annual parallax shift of 9.68 mas as seen from Earth, it is located roughly 340 light years from the Sun. It is moving away from the Sun with a radial velocity of 8 km/s.

Omicron Arietis, Latinised from ο Arietis, is the Bayer designation for a single, blue-white-hued star in the northern constellation of Aries. It has an apparent visual magnitude of +5.78, which means it is dimly visible to the naked eye. Based upon an annual parallax shift of 5.49 mas as seen from Earth, it is located roughly 590 light-years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.22 due to interstellar dust.

<span class="mw-page-title-main">106 Aquarii</span> Star in the constellation Aquarius

106 Aquarii, abbreviated 106 Aqr, is a single star in the equatorial constellation of Aquarius. 106 Aquarii is the Flamsteed designation, and it also bears the Bayer designation i1 Aquarii. It has an apparent visual magnitude of +5.2, making it bright enough to be viewed from the suburbs according to the Bortle Dark-Sky Scale. An annual parallax shift of 8.61 milliarcseconds yields an estimated distance of around 380 light-years from Earth.

56 Aquarii, abbreviated 56 Aqr, is a star in the constellation of Aquarius. 56 Aquarii is its Flamsteed designation. It is a sixth magnitude star, having an apparent visual magnitude of 6.36, and thus is a challenge to view with the naked eye. Based upon an annual parallax shift of 5.07 mas, it is located around 643 light years from the Earth. At that distance, the visual magnitude is diminished by an extinction of 0.12 due to interstellar dust. The star is moving closer with a heliocentric radial velocity of −28 km/s. It is a candidate runaway star showing a transverse peculiar velocity of 213.87 km/s.

Delta<sup>3</sup> Canis Minoris Star in the constellation Canis Minor

Delta3 Canis Minoris, Latinized from δ3 Canis Minoris, is a solitary, white-hued star in the equatorial constellation of Canis Minor. Based upon a parallax of 4.46 mas as seen from Gaia spacecraft in its repeated orbits around the Sun, just beyond the Earth. This star is about 730 light years from the Solar System. At that distance, the visual magnitude of these stars is diminished by an extinction of more than 0.15 due to interstellar dust. With an apparent visual magnitude of +5.81, it is just bright enough to be faintly visible to the naked eye.

<span class="mw-page-title-main">Nu Cassiopeiae</span> B-type star in the constellation Cassiopeia

Nu Cassiopeiae, Latinized from ν Cassiopeiae, is a solitary star in the northern constellation of Cassiopeia. With an apparent visual magnitude of +4.89, it is a faint star but visible to the naked eye. Based upon an annual parallax shift of 7.92 mas as seen from Earth, this star is located around 410 light years from the Sun. Cowley et al. (1969) catalogued this star with a stellar classification of B9 III, indicating it has the spectrum of an evolved B-type giant star. However, Palmer et al. (1968) assigned it a class of B8 V, which would instead suggest it is an ordinary B-type main-sequence star.

<span class="mw-page-title-main">HD 100673</span> Be star in the constellation Centaurus

A Centauri is a single star in the southern constellation of Centaurus. It is blue-white in hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.62. The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax. It appears to be drifting further away with a radial velocity of around +6 km/s.

67 Aquarii is a star located 484 light years away from the Sun in the zodiac constellation of Aquarius. 67 Aquarii is its Flamsteed designation. It is a dim, blue-white hued star near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.40. At the distance of this star, its visual magnitude is diminished by an extinction of 0.11 due to interstellar dust. The position of this star near the ecliptic means it is subject to lunar eclipses.

Upsilon³ Eridani, officially named Beemim, is a star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 3.96 The distance to this star, based upon an annual parallax shift of 11.01 mas, is around 296 light-years.

<span class="mw-page-title-main">64 Eridani</span> Single, yellow-white hued star in the constellation Eridanus

64 Eridani is a single, yellow-white hued star in the constellation Eridanus having variable star designation S Eridani. It is faintly visible to the naked eye with an apparent visual magnitude of 4.77. The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 272 light years. In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.

Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81, it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds, it is located roughly 740 light-years away from the Sun.

Upsilon2 Hydrae, Latinised from υ2 Hydrae, is a solitary star in the equatorial constellation of Hydra. Visible to the naked eye, it is photometrically stable with an apparent visual magnitude of 4.59. Based upon an annual parallax shift of 10.40 mas as seen from Earth, it is located about 314 light-years from the Sun.

HD 34968 is a binary star system in the southern constellation Lepus. The combined apparent visual magnitude of 4.69 is bright enough to be visible to the naked eye. The distance to HD 34968 can be estimated from its annual parallax shift of 8.7 mas, yielding a range of 374 light years. It is moving further away from the Earth with a heliocentric radial velocity of 31 km/s, having come within 118.6 ly some 3,686,000 years ago.

υ Gruis, Latinised as Upsilon Gruis, is a double star in the southern constellation of Grus. The apparent magnitude is 5.61, which is bright enough to be viewed with the naked eye. Located around 87 parsecs (280 ly) distant, the white-hued primary is an A-type main-sequence star of spectral type A1V, a star that is currently fusing its core hydrogen. it is spinning rapidly with a projected rotational velocity of 320 km/s. The companion is a magnitude 8.24 star at an angular separation of 0.90″ from the primary along a position angle of 205°, as of 2009.

Rho3 Eridani, Latinized from ρ3 Eridani, is a star located in the constellation Eridanus. It forms an asterism with Rho1 and Rho2 Eridani, south of Cetus, in the upper north east portion of Eridanus. The star has an apparent visual magnitude of 5.26, which is bright enough to be seen with the naked eye on a dark, clear night. The distance to this star, as determined via the parallax method, is about 136 light years.

References

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