Universe Guide


237 G. Aqr, HD220957, HIP115839

237 G. Aqr is a white to yellow giant star that can be located in the constellation of Aquarius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP115839 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD220957. The Id of the star in the Gould Star Catalogue is 237. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Location of 237 G. Aqr

The location of the star in the galaxy is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For 237 G. Aqr, the location is 23h 28m 05.14 and -11d26`58.9 .

Proper Motion of 237 G. Aqr

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -21.66 ± 0.26 miliarcseconds/year towards the north and 99.16 ± 0.42 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 237 G. Aqr

237 G. Aqr has a spectral type of G6/G8III. This means the star is a white to yellow giant star. The star is 7381.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24074.1164206400000000s. The star has a B-V Colour Index of 0.9 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,052 Kelvin.

237 G. Aqr Radius has been calculated as being 7.34 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,110,346.49.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 8.13. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

237 G. Aqr Apparent and Absolute Magnitudes

237 G. Aqr has an apparent magnitude of 6.37 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 1.10 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.88. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to 237 G. Aqr

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.83 which gave the calculated distance to 237 G. Aqr as 369.38 light years away from Earth or 113.25 parsecs. It would take a spaceship travelling at the speed of light, 369.38 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 7.97 which put 237 G. Aqr at a distance of 409.24 light years or 125.47 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,381.00 Parsecs or 24,074.12 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

237 G. Aqr Facts

Alternative Names

Traditional/Proper Name237 G. Aqr
Hipparcos Library I.D.115839
Bonner DurchmusterungBD-12 6496
Gould I.D.237
Henry Draper Designation220957

Visual Facts

Star Typegiant star
Absolute Magnitude1.10 / 0.88
Visual / Apparent Magnitude6.37
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 28m 05.14
Declination (Dec.)-11d26`58.9
Galactic Latitude-64.92 degrees
Galactic Longitude67.59 degrees
1997 Distance from Earth8.83 Parallax (milliarcseconds)
 369.38 Light Years
 113.25 Parsecs
2007 Revised Distance from Earth7.97 Parallax (milliarcseconds)
 409.24 Light Years
 125.47 Parsecs
Galacto-Centric Distance24,074.12 Light Years / 7,381.00 Parsecs
Proper Motion Dec.-21.66 ± 0.26 milliarcseconds/year
Proper Motion RA.99.16 ± 0.42 milliarcseconds/year
B-V Index0.90
Radial Velocity-81.26 ± 0.10 km/s
Spectral TypeG6/G8III
Colour(G) White to Yellow

Estimated Facts

Calculated Effective Temperature5,052 Kelvin

Sources and Links

SIMBAD SourceLink

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