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V2388 Ophiuchi, HD163151, HIP87655

V2388 Ophiuchi is a blue to white eclipsing binary system star that can be located in the constellation of Ophiuchus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 1.30 Billion of Years but could be as young as 1.20 to 1.40 according to Hipparcos.

HIP87655 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD163151.

V2388 Ophiuchi has alternative name(s), V2388 Oph.

Location of V2388 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 V2388 Ophiuchi, the location is 17h 54m 14.21 and +11d 07` 51.4 .

Proper Motion of V2388 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 -163.35 ± 0.52 miliarcseconds/year towards the north and -68.54 ± 0.82 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 -25.88000 km/s with an error of about 0.52 km/s .

V2388 Ophiuchi 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 3.0000000 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, Age, Radius) of V2388 Ophiuchi

V2388 Ophiuchi has a spectral type of F5Vn. This means the star is a blue to white star. The star is 7348.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23966.4825171200000000s. The star has a B-V Colour Index of 0.47 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,412 Kelvin.

V2388 Ophiuchi Radius has been calculated as being 2.90 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,020,134.95.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.56. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.16 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.30 Billion years old but could be between 1.20 and 1.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

V2388 Ophiuchi Apparent and Absolute Magnitudes

V2388 Ophiuchi has an apparent magnitude of 6.24 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 2.08 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.64. 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 V2388 Ophiuchi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.72 which gave the calculated distance to V2388 Ophiuchi as 221.58 light years away from Earth or 67.93 parsecs. It would take a spaceship travelling at the speed of light, 221.58 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 12.00 which put V2388 Ophiuchi at a distance of 271.80 light years or 83.33 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 7,348.00 Parsecs or 23,966.48 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 V2388 Ophiuchi

The star is a eclipsing binary system Beta Lyrae (Sheliak) 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. V2388 Ophiuchi brightness ranges from a magnitude of 6.553 to a magnitude of 6.253 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.8 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.

V2388 Ophiuchi Facts

Alternative Names

Traditional/Proper NameV2388 Ophiuchi
Short NameV2388 Oph
Hipparcos Library I.D.87655
Bonner DurchmusterungBD+11 3283
Henry Draper Designation163151

Visual Facts

Star Type star
Age1.30 Billion Years Old
Age Range1.20 - 1.40 Billion Years Old
Absolute Magnitude2.08 / 1.64
Visual / Apparent Magnitude6.24
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 54m 14.21
Declination (Dec.)+11d 07` 51.4
Galactic Latitude17.68 degrees
Galactic Longitude36.62 degrees
1997 Distance from Earth14.72 Parallax (milliarcseconds)
 221.58 Light Years
 67.93 Parsecs
2007 Revised Distance from Earth12.00 Parallax (milliarcseconds)
 271.80 Light Years
 83.33 Parsecs
Galacto-Centric Distance23,966.48 Light Years / 7,348.00 Parsecs
Proper Motion Dec.-163.35 ± 0.52 milliarcseconds/year
Proper Motion RA.-68.54 ± 0.82 milliarcseconds/year
B-V Index0.47
Radial Velocity-25.88 ± 0.52 km/s
Iron Abundance0.16 ± 9.99 Fe/H
Spectral TypeF5Vn
Colour(F) blue to white

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days0.802
Variable Magnitude Range (Brighter - Dimmer)6.253 - 6.553

Estimated Facts

Luminosity (x the Sun)3.0000000
Calculated Effective Temperature6,412 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
163151+11 3283.0A7.40000-58.00000-165.00000F5Yellow/White

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