HD 126128

Last updated
HD 126128/9
Observation data
Epoch J2000       Equinox J2000
Constellation Boötes
Right ascension 14h 23m 22.69526s [1]
Declination +08° 26′ 47.8351″ [1]
Apparent magnitude  (V)6.86 + 5.14 [2]
Characteristics
HD 126128
Spectral type F0V + F2V [3]
U−B color index -0.01 [2]
B−V color index +0.43 [2]
HD 126129
Spectral type A0V [4]
U−B color index −0.01 [2]
B−V color index +0.01 [2]
Astrometry
Radial velocity (Rv)−23.0±1.6 [5] km/s
Proper motion (μ)RA: -75.89 [1]   mas/yr
Dec.: -8.13 [1]   mas/yr
Parallax (π)15.17 ± 0.53 [1] mas
Distance 215 ± 8 ly
(66 ± 2 pc)
Details
HD 126129
Rotational velocity (v sin i)133 [4]  km/s
Other designations
ADS 9247 ABC, WDS J14234+0827A,BC
HD 126128: HR 5385
HD 126129: BD+09 2882, HIP 70327, HR 5386, SAO 120426
Database references
HD 126128
SIMBAD data
HD 126129
SIMBAD data

HD 126128/9 is a triple star in the northern constellation of Boötes. Two of the components (HD 126128) form a binary star system with an orbital period of 39.5 years and an eccentricity of 0.25. The third component (HD 126129), and the brightest member of the trio, lies at an angular separation of 6.250″ from the other two. [3]

Constellation one of the 88 divisions of the celestial sphere, defined by the IAU, many of which derive from traditional asterisms

A constellation is a group of stars that forms an imaginary outline or pattern on the celestial sphere, typically representing an animal, mythological person or creature, a god, or an inanimate object.

Binary star star system consisting of two stars

A binary star is a star system consisting of two stars orbiting around their common barycenter. Systems of two or more stars are called multiple star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as multiple by other means. Research over the last two centuries suggests that half or more of visible stars are part of multiple star systems.

The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.

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Eta Crateris Star in the constellation Crater

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66 Tauri, also known as r Tauri, is a binary star in the constellation of Taurus. The combined apparent magnitude of the system is 5.098, with the magnitudes of the two components being 5.8 and 5.9, respectively. Parallax measurements by Hipparcos put 66 Tauri at some 400 light-years away.

Nu2 Lyrae, Latinized from ν2 Lyrae, or sometimes simply Nu Lyrae, is a solitary star in the northern constellation of Lyra. Based upon an annual parallax shift of 14.09 mas as seen from Earth, it is located around 231 light years from the Sun. With an apparent visual magnitude of 5.23, it is bright enough to be faintly visible to the naked eye.

32 Tauri is the Flamsteed designation for a solitary star in the zodiac constellation of Taurus. It has a visual magnitude of 5.64, making it visible to the naked eye from suburban skies. The position of this star near the ecliptic plane means that it is subject to occultations by the Moon. Parallax measurements with the Hipparcos spacecraft put it at a distance of roughly 138 light-years from the Sun.

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752  Lock-green.svg, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 5 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
  3. 1 2 Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society . 389 (2): 869–879. arXiv: 0806.2878  Lock-green.svg. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  4. 1 2 Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv: astro-ph/0610785  Lock-green.svg, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224
  5. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053  Lock-green.svg. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.


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