Universe Guide


V4199 Sagittarii, HD181558, HIP95159

V4199 Sagittarii is a blue giant 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.

HIP95159 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD181558. The Id of the star in the Gould Star Catalogue is 173. 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.

V4199 Sagittarii has alternative name(s), V4199 Sgr.

Location of V4199 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 V4199 Sagittarii, the location is 19h 21m 37.11 and -19d14`03.9 .

Proper Motion of V4199 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 -11.81 ± 0.23 miliarcseconds/year towards the north and 2.52 ± 0.38 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V4199 Sagittarii

V4199 Sagittarii has a spectral type of B5III. This means the star is a blue giant star. The star is 7184.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23431.5746329600000000s. The star has a B-V Colour Index of -0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,375 Kelvin.

V4199 Sagittarii Radius has been calculated as being 2.81 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,956,538.32.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.24. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V4199 Sagittarii Apparent and Absolute Magnitudes

V4199 Sagittarii has an apparent magnitude of 6.25 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 -0.34 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.65. 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 V4199 Sagittarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.80 which gave the calculated distance to V4199 Sagittarii as 679.51 light years away from Earth or 208.33 parsecs. It would take a spaceship travelling at the speed of light, 679.51 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 4.17 which put V4199 Sagittarii at a distance of 782.17 light years or 239.81 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 7,184.00 Parsecs or 23,431.57 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. V4199 Sagittarii brightness ranges from a magnitude of 6.243 to a magnitude of 6.194 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.2 days (variability).

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.

V4199 Sagittarii Facts

Alternative Names

Traditional/Proper NameV4199 Sagittarii
Short NameV4199 Sgr
Hipparcos Library I.D.95159
Bonner DurchmusterungBD-19 5412
Gould I.D.173
Henry Draper Designation181558

Visual Facts

Star Typegiant star
Absolute Magnitude-0.34 / -0.65
Visual / Apparent Magnitude6.25
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 21m 37.11
Declination (Dec.)-19d14`03.9
Galactic Latitude-15.10 degrees
Galactic Longitude18.74 degrees
1997 Distance from Earth4.80 Parallax (milliarcseconds)
 679.51 Light Years
 208.33 Parsecs
2007 Revised Distance from Earth4.17 Parallax (milliarcseconds)
 782.17 Light Years
 239.81 Parsecs
Galacto-Centric Distance23,431.57 Light Years / 7,184.00 Parsecs
Proper Motion Dec.-11.81 ± 0.23 milliarcseconds/year
Proper Motion RA.2.52 ± 0.38 milliarcseconds/year
B-V Index-0.09
Radial Velocity-23.30 ± 7.40 km/s
Spectral TypeB5III
Colour(B) blue

Variable Star Details

Mean Variability Period in Days1.238
Variable Magnitude Range (Brighter - Dimmer)6.194 - 6.243

Estimated Facts

Calculated Effective Temperature11,375 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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
181558-19 5412.0A6.400007.000001.00000B8Blue/White
181539-19 5409.0C10.00000K0Orange1899

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