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V4387 Sagittarii, HD167356, HIP89470

V4387 Sagittarii is a blue 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.

HIP89470 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD167356. The Id of the star in the Gould Star Catalogue is 45. 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.

V4387 Sagittarii has alternative name(s), V4387 Sgr.

Location of V4387 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 V4387 Sagittarii, the location is 18h 15m 30.76 and -18d 39` 41.7 .

Proper Motion of V4387 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 -1.73 ± 0.33 miliarcseconds/year towards the north and 0.24 ± 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 2.00000 km/s with an error of about 4.30 km/s .

Physical Properties (Colour, Temperature, Radius) of V4387 Sagittarii

V4387 Sagittarii has a spectral type of Ap Si. This means the star is a blue star. The star has a B-V Colour Index of 0.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,747 Kelvin.

V4387 Sagittarii Radius has been calculated as being 38.43 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 26,740,124.47.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 13.95. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V4387 Sagittarii Apparent and Absolute Magnitudes

V4387 Sagittarii has an apparent magnitude of 6.05 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 -4.35 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.15. 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 V4387 Sagittarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.83 which gave the calculated distance to V4387 Sagittarii as 3929.68 light years away from Earth or 1204.82 parsecs. It would take a spaceship travelling at the speed of light, 3929.68 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 2.29 which put V4387 Sagittarii at a distance of 1424.29 light years or 436.68 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. V4387 Sagittarii brightness ranges from a magnitude of 6.123 to a magnitude of 6.091 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.4 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.

V4387 Sagittarii Facts

Alternative Names

Traditional/Proper NameV4387 Sagittarii
Short NameV4387 Sgr
Hipparcos Library I.D.89470
Bonner DurchmusterungBD-18 4864
Gould I.D.45
Henry Draper Designation167356

Visual Facts

Star Type star
Absolute Magnitude-4.35 / -2.15
Visual / Apparent Magnitude6.05
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 15m 30.76
Declination (Dec.)-18d 39` 41.7
Galactic Latitude-0.82 degrees
Galactic Longitude12.31 degrees
1997 Distance from Earth0.83 Parallax (milliarcseconds)
 3929.68 Light Years
 1204.82 Parsecs
2007 Revised Distance from Earth2.29 Parallax (milliarcseconds)
 1424.29 Light Years
 436.68 Parsecs
Proper Motion Dec.-1.73 ± 0.33 milliarcseconds/year
Proper Motion RA.0.24 ± 0.52 milliarcseconds/year
B-V Index0.16
Radial Velocity2.00 ± 4.30 km/s
Spectral TypeAp Si
Colour(A) blue

Variable Star Details

Mean Variability Period in Days2.360
Variable Magnitude Range (Brighter - Dimmer)6.091 - 6.123

Estimated Facts

Calculated Effective Temperature7,747 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
167356-18 4864.0A6.1000015.000005.00000A2White

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