Universe Guide


V1077 Scorpii - HD156325 - HIP84650

V1077 Scorpii is a blue eruptive giant star that can be located in the constellation of Scorpius. HIP84650 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD156325. V1077 Scorpii has alternative name(s), V1077_Sco.

Location of V1077 Scorpii

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 V1077 Scorpii, the location is 17h 18m 20.51 and -32d33`11.1 .

Proper Motion of V1077 Scorpii

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 -007.01 ± 000.21 towards the north and -002.05 ± 000.44 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V1077 Scorpii

V1077 Scorpii has a spectral type of B5III. This means the star is a blue giant star. The star has a B-V Colour Index of 0.1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,455 Kelvin.

V1077 Scorpii has been calculated as 8.97 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,239,876.87.km.

V1077 Scorpii Apparent and Absolute Magnitudes

V1077 Scorpii 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 -1.57 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.16. 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 V1077 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.59 which gave the calculated distance to V1077 Scorpii as 1259.32 light years away from Earth or 386.10 parsecs. It would take a spaceship travelling at the speed of light, 1259.32 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 3.13 which put V1077 Scorpii at a distance of 1042.06 light years or 319.49 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.

Variable Type of V1077 Scorpii

The star is a eruptive Gamma Cassiopeiae variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. V1077 Scorpii brightness ranges from a magnitude of 6.000 to a magnitude of 6.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

V1077 Scorpii Facts

Alternative Names

Traditional NameV1077 Scorpii
Short NameV1077 Sco
Hipparcos Library I.D.84650
Henry Draper Designation156325

Visual Facts

Star Typegiant star
Absolute Magnitude-1.57 / -1.16
Apparent Magnitude6.36
Right Ascension (R.A.)17h 18m 20.51
Declination (Dec.)-32d33`11.1
1997 Distance from Earth2.59 Parallax (milliarcseconds)
 1259.32 Light Years
 386.10 Parsecs
2007 Revised Distance from Earth3.13 Parallax (milliarcseconds)
 1042.06 Light Years
 319.49 Parsecs
Proper Motion Dec.-7.01 ± 0.21 milliarcseconds/year
Proper Motion RA.-2.05 ± 0.44 milliarcseconds/year
B-V Index0.10
Spectral TypeB5III
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae

Estimated Facts

Radius (x the Sun)8.97
Calculated Effective Temperature8,455 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

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