HD 210434

Last updated
HD 210434
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 22h 10m 33.74601s [1]
Declination −04° 16′ 00.6776″ [1]
Apparent magnitude  (V) 5.979 [2]
Characteristics
Spectral type KG8/0III [3]
U−B color index 0.84 [4]
B−V color index 0.981 [3]
Astrometry
Radial velocity (Rv)−18.1 [5] km/s
Proper motion (μ)RA: +71.82 [1]   mas/yr
Dec.: +3.74 [1]   mas/yr
Parallax (π)9.81 ± 0.44 [1] mas
Distance 330 ± 10 ly
(102 ± 5 pc)
Absolute magnitude  (MV)1.30 [3]
Details
Mass 2.4 [3]   M☉
Surface gravity (log g)3.0 [3] [2]   cgs
Temperature 4,928 [3] [2]   K
Metallicity [Fe/H]0.090±0.090 [3] [2]   dex
Rotational velocity (v sin i)3.3 [3]  km/s
Age 630 [3]   Myr
Other designations
BD-04° 5625, HD 210434, HIP 109466, HR 8453, SAO 145916.
Database references
SIMBAD data

HD 210434 is a subgiant star [3] in the equatorial constellation of Aquarius. According to the Bortle scale, an apparent magnitude of six means this star is faintly visible to the naked eye from dark rural skies. It is an estimated 630 million years old with 2.4 times the mass of the Sun. [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.

Aquarius (constellation) zodiac constellation straddling the celestial equator

Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for "water-carrier" or "cup-carrier", and its symbol is , a representation of water. Aquarius is one of the oldest of the recognized constellations along the zodiac. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.

The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution. John E. Bortle created the scale and published it in the February 2001 edition of Sky & Telescope magazine to help amateur astronomers evaluate the darkness of an observing site, and secondarily, to compare the darkness of observing sites. The scale ranges from Class 1, the darkest skies available on Earth, through Class 9, inner-city skies. It gives several criteria for each level beyond naked-eye limiting magnitude (NELM). The accuracy and utility of the scale have been questioned in recent research.

Related Research Articles

Pi Serpentis, Latinized from π Serpentis, is a solitary white-hued star in the constellation Serpens, located in its head, Serpens Caput. Based upon an annual parallax shift of 18.22 mas as seen from Earth, it is located around 179 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.82.

Delta Volantis Star in the constellation Volans

Delta Volantis is a solitary star in the southern constellation Volans. It has an apparent visual magnitude of +3.97, which is bright enough to be seen with the naked eye. Based upon parallax measurements, is approximately 740 light years from the Sun.

Eta Volantis star

Eta Volantis is a single star in the southern constellation of Volans. It has an apparent visual magnitude of 5.28, which is bright enough to be seen with the naked eye. Based upon parallax measurements, it is approximately 381 light years from Earth.

75 Cancri is a binary star in the constellation of Cancer. The system is located about 102 light-years away, based on its stellar properties.

HD 125072 is K3-IV class star in the constellation Centaurus. The components of the space velocity for this star are U=−18.5, V=−6.9 and W=−26.9 km/s. Based on the composition and kinematics of this star, it has an estimated age of about 10 billion years.

HD 87822 is a binary star in the northern constellation of Leo Minor. The pair orbit each other with a period of about 18 years.

HD 219279 is a double star in the equatorial constellation of Aquarius. It has three companions.

HD 205765 is a star in the equatorial constellation of Aquarius. It is an A-type main sequence star with an apparent magnitude of 6.2, which, according to the Bortle scale, makes it faintly visible to the naked eye from dark rural skies. This star is spinning rapidly with a projected rotational velocity of 172 km/s.

HD 118889 is a binary star in the northern constellation of Boötes.

HD 127304 is a double star in the northern constellation of Boötes. The brighter component is a sixth magnitude A-type main sequence star with a stellar classification of A0Vs It has a faint magnitude 10.62 companion at an angular separation of 25.6″ along a position angle of 256°.

HD 130603 is a double star in the northern constellation of Boötes. As of 2010.476, the components have an angular separation of 2.06″ along a position angle of 54.7°.

HD 128093 is a double star in the constellation Boötes. The brighter component is an F-type main sequence star with a stellar classification of F5V and an apparent magnitude of 6.33. It has a magnitude 11.33 companion at an angular separation of 28.1 along a position angle of 318°.

HD 131040 is a double star in the northern constellation of Boötes. The brighter component is a subgiant star that varies slightly in luminosity by 0.04 in magnitude. The magnitude 9.64 companion lies at an angular separation of 15.2″ along a position angle of 93°.

HD 126009 or CI Boötis is a variable star in the northern constellation of Boötes.

HD 24480 is a double star in the northern constellation of Camelopardalis. The brighter component is a giant star with a stellar classification of K4III and an apparent magnitude of 5.20. The pair have an angular separation of 1.71″.

HD 112028 is an evolved star in the northern constellation of Camelopardalis. It has spectral peculiarities that have been interpreted as a shell, and also relatively weak magnesium and silicon lines. Its spectral class has been variously assigned between B9 and A2, and its luminosity class between a subgiant and bright giant.

HD 30442 is a asymptotic giant branch star in the northern constellation of Camelopardalis.

36 Aquarii is a yellow giant star or subgiant star in the constellation of Aquarius. 36 Aquarii is its Flamsteed designation. It is approximately 520 light-years from Earth.

HD 93607 star

HD 93607 is a star in the constellation Carina. Its apparent magnitude is 4.87. Its parent cluster is IC 2602.

60 Herculis is a star in the constellation Hercules. Its apparent magnitude is 4.871.

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 Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069  Lock-green.svg, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247
  3. 1 2 3 4 5 6 7 8 9 10 11 Randich, S.; et al. (August 1999), "Lithium in population I subgiants", Astronomy and Astrophysics, 348: 487–500, Bibcode:1999A&A...348..487R
  4. ↑ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
  5. ↑ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
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