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236 G. Aquarii

236 G. Aquarii Facts

  • 236 G. Aquarii is a giant star that can be located in the constellation of Aquarius. The description is based on the spectral class.
  • 236 G. Aquarii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K0III) of the star, the star's colour is orange to red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 381.48 light years away from us. Distance

236 G. Aquarii's Alternative Names

HIP115709 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD220766.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 236 G. Aquarii. There are no stars with a Gould designation in Ursa Major for example.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-22 6128.

More details on objects' alternative names can be found at Star Names .

Location of 236 G. Aquarii

The location of the giant star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For 236 G. Aquarii, the location is 23h 26m 35.44 and -21° 44` 27.0 .

Radial Velocity and Proper Motion of 236 G. Aquarii

Proper Motion

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 -2.36 ± 0.58 milliarcseconds/year towards the north and 56.91 ± 0.66 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 11.10000 km/s with an error of about 2.90 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of 236 G. Aquarii

236 G. Aquarii Temperature and Colour

Based on the star's spectral type of K0III , 236 G. Aquarii's colour and type is orange to red giant star. The star has a B-V Colour Index of 1.03 which means the star's temperature is about 4,792 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

236 G. Aquarii Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 45.24 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

236 G. Aquarii Radius

236 G. Aquarii estimated radius has been calculated as being 8.51 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,920,307.93.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 8.200854108109936115136383205. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

236 G. Aquarii Apparent and Absolute Magnitudes

236 G. Aquarii has an apparent magnitude of 6.43 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 1.01 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.09. 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 236 G. Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.24000 which gave the calculated distance to 236 G. Aquarii as 395.83 light years away from Earth or 121.36 parsecs. If you want that in miles, it is about 2,326,936,281,467,268.35, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 8.55000 which put 236 G. Aquarii at a distance of 381.48 light years or 116.96 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.

Using the 2007 distance, the star is roughly 24,124,563.64 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. The star's Galacto-Centric Distance is 7,372.00 Parsecs or 24,044.76 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to 236 G. Aquarii

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking463,956,707,907.73
Car1202,131,890,263.59
Airbus A380736347,590,803.85
Speed of Sound (Mach 1)767.269333,425,215.45
Concorde (Mach 2)1,534.54166,712,390.44
New Horizons Probe33,0007,752,328.23
Speed of Light670,616,629.00381.48

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.

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Additional 236 G. Aquarii Facts and Figures

Visual Facts


Primary / Proper / Traditional Name236 G. Aquarii
Alternative NamesHD 220766, HIP 115709, BD-22 6128
Spectral TypeK0III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationAquarius
Absolute Magnitude 1.01 / 1.09
Visual / Apparent Magnitude6.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 26m 35.44
Declination (Dec.)-21° 44` 27.0
Galactic Latitude-69.98017246 degrees
Galactic Longitude43.90998100 degrees
1997 Distance from Earth8.24000 Parallax (milliarcseconds)
 395.83 Light Years
 121.36 Parsecs
2007 Distance from Earth8.55000 Parallax (milliarcseconds)
 381.48 Light Years
 116.96 Parsecs
 24,124,563.64 Astronomical Units
Galacto-Centric Distance24,044.76 Light Years / 7,372.00 Parsecs
Proper Motion Dec.-2.36000 ± 0.58000 milliarcseconds/year
Proper Motion RA.56.91000 ± 0.66000 milliarcseconds/year
B-V Index1.03
Radial Velocity11.10000 ± 2.90 km/s
Eccentricity0.06730
Semi-Major Axis7724.0000000
Stellar Luminosity (Lsun)45.2400000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)8.20
Effective Temperature4,792 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
220766-22 6128.0A6.6000056.000009.00000K0Orange
B12.000001897

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