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48 G. Sagittarii, HD167665, HIP89620

48 G. Sagittarii is a blue to white main sequence dwarf star that can be located in the constellation of Sagittarius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 4.30 Billion of Years but could be as young as 3.50 to 5.30 according to Hipparcos.

48 G. Sagittarii's Alternative Names

HIP89620 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD167665.

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 48 G. Sagittarii. There are no stars with a Gould designation in Ursa Major for example.

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

Location of 48 G. Sagittarii

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 48 G. Sagittarii, the location is 18h 17m 23.66 and -28° 17` 19.0 .

Proper Motion of 48 G. Sagittarii

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 -151.58 ± 0.28 miliarcseconds/year towards the north and 132.79 ± 0.52 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 8.34000 km/s with an error of about 0.22 km/s .

48 G. Sagittarii 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 2.4500000 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature, Age) of 48 G. Sagittarii

48 G. Sagittarii has a spectral type of F8V. This means the star is a blue to white main sequence dwarf star. The star is 7370.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24038.2384528000000000s. The star has a B-V Colour Index of 0.53 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,162 Kelvin.

48 G. Sagittarii Radius has been calculated as being 1.30 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 903,452.18.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.33. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.17 with an error value of 0.03 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 4.30 Billion years old but could be between 3.50 and 5.30 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

48 G. Sagittarii Apparent and Absolute Magnitudes

48 G. Sagittarii has an apparent magnitude of 6.36 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 4.00 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.94. 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 48 G. Sagittarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 33.72 which gave the calculated distance to 48 G. Sagittarii as 96.73 light years away from Earth or 29.66 parsecs. It would take a spaceship travelling at the speed of light, 96.73 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 32.80 which put 48 G. Sagittarii at a distance of 99.44 light years or 30.49 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 7,370.00 Parsecs or 24,038.24 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.

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48 G. Sagittarii Facts

Visual Facts

Alternative NamesHD 167665, HIP 89620
Star Type main sequence Dwarf Star
GalaxyMilky Way
Age4.30 Billion Years Old
Age Range3.50 - 5.30 Billion Years Old
Absolute Magnitude4.00 / 3.94
Visual / Apparent Magnitude6.36
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 17m 23.66
Declination (Dec.)-28° 17` 19.0
Galactic Latitude-5.75 degrees
Galactic Longitude4.01 degrees
1997 Distance from Earth33.72 Parallax (milliarcseconds)
 96.73 Light Years
 29.66 Parsecs
2007 Revised Distance from Earth32.80 Parallax (milliarcseconds)
 99.44 Light Years
 30.49 Parsecs
Galacto-Centric Distance24,038.24 Light Years / 7,370.00 Parsecs
Proper Motion Dec.-151.58 ± 0.28 milliarcseconds/year
Proper Motion RA.132.79 ± 0.52 milliarcseconds/year
B-V Index0.53
Radial Velocity8.34 ± 0.22 km/s
Iron Abundance-0.17 ± 0.03 Fe/H
Semi-Major Axis7789.00
Stellar Luminosity (Lsun)2.45
Spectral TypeF8V
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature6,162 Kelvin

Sources and Links

SIMBAD SourceLink

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