Universe Guide


141 G. Sagittarii - HD177817 - HIP93855

141 G. Sagittarii is a blue main sequence dwarf star that can be located in the constellation of Sagittarius. HIP93855 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD177817. The Id of the star in the Gould Star Catalogue is 141. 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 141 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 141 G. Sagittarii, the location is 19h 06m 52.12 and -16d13`45.2 .

Proper Motion of 141 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 -016.00 ± 000.35 towards the north and -000.73 ± 000.70 east if we saw them in the horizon.

141 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 140.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 141 G. Sagittarii

141 G. Sagittarii has a spectral type of B7V. This means the star is a blue coloured main sequence dwarf star. The star has a B-V Colour Index of -0.02 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,839 Kelvin.

141 G. Sagittarii has been calculated as 5.56 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,868,099.10.km.

141 G. Sagittarii Apparent and Absolute Magnitudes

141 G. Sagittarii has an apparent magnitude of 6.00 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 -1.19 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.07. 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 141 G. Sagittarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.65 which gave the calculated distance to 141 G. Sagittarii as 893.60 light years away from Earth or 273.97 parsecs. In 2007, Hipparcos data was revised with a new parallax of 3.86 which put 141 G. Sagittarii at a distance of 844.98 light years or 259.07 parsecs.

It would take a spaceship travelling at the speed of light, 893.60 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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141 G. Sagittarii Facts

Alternative Names

Traditional Name141 G. Sagittarii
Hipparcos Library I.D.93855
Bonner DurchmusterungBD-16 5153
Gould I.D.141
Henry Draper Designation177817

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-1.19 / -1.07
Apparent Magnitude6.00
Right Ascension (R.A.)19h 06m 52.12
Declination (Dec.)-16d13`45.2
1997 Distance from Earth3.65 Parallax (milliarcseconds)
 893.60 Light Years
 273.97 Parsecs
2007 Distance from Earth3.86 Parallax (milliarcseconds)
 844.98 Light Years
 259.07 Parsecs
Proper Motion Dec.-16.00 ± 0.35 milliarcseconds/year
Proper Motion RA.-0.73 ± 0.70 milliarcseconds/year
B-V Index-0.02
Spectral TypeB7V
Colour(B) blue

Estimated Facts

Radius (x the Sun)5.56
Luminosity (x the Sun)140.0000000
Calculated Effective Temperature9,839 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
177817-16 5153.0A5.9000020.000004.00000B8Blue/White

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