HD 72561

Last updated
HD 72561
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Hydra
Right ascension 08h 33m 43.47908s [1]
Declination +04° 45 25.1949 [1]
Apparent magnitude  (V)5.867 [2]
Characteristics
Spectral type G5 III [3]
U−B color index +0.87 [4]
B−V color index +1.07 [4]
Astrometry
Radial velocity (Rv)+1.60 ± 0.3 [5]  km/s
Proper motion (μ)RA: 13.18 [1]   mas/yr
Dec.: 6.84 [1]   mas/yr
Parallax (π)1.98 ± 0.41 [1]   mas
Distance approx. 1,600  ly
(approx. 500  pc)
Details [6] [note 1]
Mass 4.58 ± 0.40  M
Radius 48.41 ± 9.26  R
Luminosity 1109.6 ± 422.9  L
Surface gravity (log g)1.80 ± 0.15  cgs
Temperature 4792 ± 36  K
Metallicity [Fe/H]0.16 ± 0.10  dex
Age 0.15 ± 0.04  Gyr
Other designations
BD+05° 1997, HIP  42008, HR  3378, SAO  116890 [3]
Database references
SIMBAD data

HD 72561 is a star in the constellation Hydra. Its apparent magnitude is 5.867. [2] Based on parallax, it is located about 1,600 light-years (500 parsecs) away. [1]

HD 72561 is a G-type giant star. It is over 4 times as massive as the Sun and 48 times as wide. It is about 150 million years old. [6]

Related Research Articles

Chi Scorpii, Latinized from χ Scorpii, is a single star in the zodiac constellation of Scorpius. It has an orange hue and can be faintly seen with the naked eye with an apparent visual magnitude of 5.22. Based upon parallax measurements, this star is around 409 light years from the Sun. The star is drifting closer with a radial velocity of −23.6 km/s.

Omicron Virginis

Omicron Virginis is a star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of +4.12. Based upon parallax measurements, it is about 163 light years from the Sun.

42 Aquarii is a single star located 447 light years away from the Sun in the zodiac constellation of Aquarius. 42 Aquarii is its Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.34. This object is moving further from the Sun with a heliocentric radial velocity of around +13 km/s.

16 Aquarii, abbreviated 16 Aqr, is a star in the constellation of Aquarius. 16 Aquarii is the Flamsteed designation. It is a faint star, just visible to the naked eye, with an apparent visual magnitude of 5.869. Based upon an annual parallax shift of 9.5 mas, it is located about 342 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −6 km/s, and is predicted to come within 220 light-years in 6.8 million years.

Nu3 Canis Majoris, Latinized from ν3 Canis Majoris, is a binary star system in the southern constellation of Canis Major.

Epsilon Canis Minoris

Epsilon Canis Minoris is a suspected binary star system in the equatorial constellation of Canis Minor. It is a fifth magnitude star, which means it is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of just 3.13 mas as seen from Earth, this star is located roughly 770 light years from the Sun, give or take a 40 light year margin of error.

Kappa Capricorni Star in the constellation Capricornus

Kappa Capricorni is a solitary star in the constellation Capricornus. It is visible to the naked eye with an apparent visual magnitude of +4.73. Based upon an annual parallax shift of 11.09 mas as seen from the Earth, the star is located about 294 light years from the Sun.

Psi<sup>6</sup> Aurigae

Psi6 Aurigae, Latinized from ψ6 Aurigae, is a spectroscopic binary star in the northern constellation of Auriga. It is a dim, naked eye star with an apparent visual magnitude of +5.22. Based upon a measured annual parallax shift of 9.05 ± 0.38 mas, it is approximately 360 light-years distant from the Earth.

52 Cygni Binary star system in the constellation Cygnus

52 Cygni is a giant star in the northern constellation of Cygnus with an apparent magnitude of 4.22. Based on its Hipparcos parallax, it is about 291 light-years (89 pc) away.

HD 82785 is star in the southern constellation of Antlia.

Gamma Comae Berenices, Latinized from γ Comae Berenices, is a single, orange-hued star in the northern constellation of Coma Berenices. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.36. Based upon an annual parallax shift of 19.50 mas as seen from Earth, its distance can be estimated as around 167 light years from the Sun. The star is moving away from the Sun with a radial velocity of +3 km/s.

Psi Ophiuchi

Psi Ophiuchi, which is Latinized from ψ Ophiuchi, is a single star in the equatorial constellation of Ophiuchus, located 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. The distance to this object is approximately 199 light years based on parallax.

Theta Librae Star in the constellation Libra

θ Librae, Latinised as Theta Librae, is a single star in the southern zodiac constellation of Libra, near the constellation border with Scorpius. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.14. The distance to this star is approximately 168 light years, as determined by parallax, and it is drifting further away with a radial velocity of 5 km/s. The position of this star near the ecliptic means it is subject to lunar occultations.

4 Scorpii

4 Scorpii is a single star in the southern zodiac constellation of Scorpius. With an apparent visual magnitude of +5.6, it is dimly visible to the naked eye under good viewing conditions. The distance to this star can be estimated from its annual parallax shift of 7.99±0.77 mas, which yields a value of around 410 light years. It is moving closer to the Sun with a heliocentric radial velocity of −29 km/s and will reach perihelion in about two million years at an estimated distance of 280 ly (86 pc).

HD 115004 is a single star in the northern constellation of Canes Venatici. It is faintly visible to the naked eye with an apparent visual magnitude of 4.94. Based upon an annual parallax shift of 7.10±0.24 mas, it is located around 460 light years from the Sun. The star is moving closer with a heliocentric radial velocity of −22 km/s. HD 115004 will make its closest approach in about 1.7 million years at a separation of around 390 ly (119.45 pc).

Omega Hydrae, Latinized from ω Hydrae, is a golden-hued star in the equatorial constellation of Hydra, located to the west-southwest of the brighter star Zeta Hydrae. Based upon an annual parallax shift of just 3.64 mas as seen from Earth, it is located roughly 900 light years from the Sun. It is faintly visible to the naked eye with an apparent visual magnitude of 5.00.

Pi<sup>6</sup> Orionis

Pi6 Orionis6 Ori, π6 Orionis) is a solitary star in the eastern part of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.469. Based upon an annual parallax shift of 3.45 mas, it is around 950 light years from the Sun. At that distance, the visual magnitude of the star is reduced by an interstellar absorption factor of 0.52.

Phi Ophiuchi

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.

Nu Pegasi Star in the constellation Pegasus

ν Pegasi, Latinized as Nu Pegasi is a single star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.84. The star is located approximately 261 light years away based on parallax, but is drifting closer with a radial velocity of −19 km/s.

HD 165634 Star in the constellation Sagittarius

HD 165634 is a star in the southern constellation of Sagittarius. It has a yellow hue and is faintly visible to the naked eye with apparent visual magnitude of 4.56. The star is located at a distance of approximately 339 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −5 km/s. It has an absolute magnitude of −0.53.

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. 1 2 "HR 3378". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 23 August 2017.
  4. 1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. 1 2 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv: 1412.4634 . Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277.

Notes

  1. The Reffert et al. paper gives two different sets of results, depending on whether the star is a horizontal branch star or a red giant branch star. The parameters given here are for a horizontal branch star, since the probability of it being a horizontal branch star is 99%.