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V2052 Ophiuchi, HD163472, HIP87812

V2052 Ophiuchi is a blue pulsating subgiant star that can be located in the constellation of Ophiuchus. V2052 Ophiuchi is the brightest star in Ophiuchus based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP87812 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD163472. The Id of the star in the Gould Star Catalogue is 182. 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.

V2052 Ophiuchi has alternative name(s), V2052 Oph.

Location of V2052 Ophiuchi

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 V2052 Ophiuchi, the location is 17h 56m 18.40 and +00d 40` 13.3 .

Proper Motion of V2052 Ophiuchi

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 -0.63 ± 0.27 miliarcseconds/year towards the north and -4.72 ± 0.41 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V2052 Ophiuchi

V2052 Ophiuchi has a spectral type of B2IV-V. This means the star is a blue subgiant star. The star is 7069.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23056.4867873600000000s. The star has a B-V Colour Index of 0.05 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,917 Kelvin.

V2052 Ophiuchi Radius has been calculated as being 6.83 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,752,938.30.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 11.18. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V2052 Ophiuchi Apparent and Absolute Magnitudes

V2052 Ophiuchi has an apparent magnitude of 5.82 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 -1.21 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.28. 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 V2052 Ophiuchi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.93 which gave the calculated distance to V2052 Ophiuchi as 829.93 light years away from Earth or 254.45 parsecs. It would take a spaceship travelling at the speed of light, 829.93 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 2.40 which put V2052 Ophiuchi at a distance of 1359.01 light years or 416.67 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 7,069.00 Parsecs or 23,056.49 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V2052 Ophiuchi

The star is a pulsating Beta Cephei 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. V2052 Ophiuchi brightness ranges from a magnitude of 5.865 to a magnitude of 5.834 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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.

V2052 Ophiuchi Facts

Alternative Names

Traditional/Proper NameV2052 Ophiuchi
Short NameV2052 Oph
Hipparcos Library I.D.87812
Bonner DurchmusterungBD+00 3813
Gould I.D.182
Henry Draper Designation163472

Visual Facts

Star Typesubgiant star
Absolute Magnitude-1.21 / -2.28
Visual / Apparent Magnitude5.82
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 56m 18.40
Declination (Dec.)+00d 40` 13.3
Galactic Latitude12.55 degrees
Galactic Longitude27.16 degrees
1997 Distance from Earth3.93 Parallax (milliarcseconds)
 829.93 Light Years
 254.45 Parsecs
2007 Revised Distance from Earth2.40 Parallax (milliarcseconds)
 1359.01 Light Years
 416.67 Parsecs
Galacto-Centric Distance23,056.49 Light Years / 7,069.00 Parsecs
Proper Motion Dec.-0.63 ± 0.27 milliarcseconds/year
Proper Motion RA.-4.72 ± 0.41 milliarcseconds/year
B-V Index0.05
Radial Velocity-17.60 ± 0.80 km/s
Spectral TypeB2IV-V
Colour(B) blue

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeBeta Cephei
Mean Variability Period in Days0.140
Variable Magnitude Range (Brighter - Dimmer)5.834 - 5.865

Estimated Facts

Calculated Effective Temperature8,917 Kelvin

Sources and Links

SIMBAD SourceLink

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