Universe Guide

208 G. Ophiuchi

208 G. Ophiuchi Facts

  • 208 G. Ophiuchi is a giant star that can be located in the constellation of Ophiuchus. The description is based on the spectral class.
  • 208 G. Ophiuchi is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K2III) of the star, the star's colour is orange to red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 152.63 light years away from us. Distance

208 G. Ophiuchi's Alternative Names

HIP89772 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD168387.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 208 G. Ophiuchi. There are no stars with a Gould designation in Ursa Major for example.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+07 3629.

More details on objects' alternative names can be found at Star Names .

Location of 208 G. Ophiuchi

The location of the giant star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For 208 G. Ophiuchi, the location is 18h 19m 09.56 and +07° 15` 35.1 .

Radial Velocity and Proper Motion of 208 G. Ophiuchi

Proper Motion

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 1.59 ± 0.18 milliarcseconds/year towards the north and -45.16 ± 0.31 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -8.48000 km/s with an error of about 0.19 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of 208 G. Ophiuchi

208 G. Ophiuchi Colour and Temperature

Based on the star's spectral type of K2III , 208 G. Ophiuchi's colour and type is orange to red giant star. The star has a B-V Colour Index of 1.08 which means the star's temperature is about 4,700 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

208 G. 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 19.80 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

208 G. Ophiuchi Radius

208 G. Ophiuchi estimated radius has been calculated as being 5.23 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,640,583.59.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 5.453652550736637384242752989. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

208 G. Ophiuchi Iron Abundance

208 G. Ophiuchi Iron Abundance is 0.14 with an error value of 0.06 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

208 G. Ophiuchi Apparent and Absolute Magnitudes

208 G. Ophiuchi has an apparent magnitude of 5.41 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 2.15 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.06. 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 208 G. Ophiuchi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 22.24000 which gave the calculated distance to 208 G. Ophiuchi as 146.66 light years away from Earth or 44.96 parsecs. If you want that in miles, it is about 862,159,197,231,108.24, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 21.37000 which put 208 G. Ophiuchi at a distance of 152.63 light years or 46.79 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.

Using the 2007 distance, the star is roughly 9,651,063.03 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. The star's Galacto-Centric Distance is 7,363.00 Parsecs or 24,015.41 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to 208 G. Ophiuchi

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A380736139,070,945.77
Speed of Sound (Mach 1)767.269133,403,299.34
Concorde (Mach 2)1,534.5466,701,562.74
New Horizons Probe33,0003,101,703.52
Speed of Light670,616,629.00152.63

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.

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Additional 208 G. Ophiuchi Facts and Figures

Visual Facts

Primary / Proper / Traditional Name208 G. Ophiuchi
Alternative NamesHD 168387, HIP 89772, BD+07 3629
Spectral TypeK2III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 2.15 / 2.06
Visual / Apparent Magnitude5.41
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 19m 09.56
Declination (Dec.)+07° 15` 35.1
Galactic Latitude10.46026688 degrees
Galactic Longitude35.78627626 degrees
1997 Distance from Earth22.24000 Parallax (milliarcseconds)
 146.66 Light Years
 44.96 Parsecs
2007 Distance from Earth21.37000 Parallax (milliarcseconds)
 152.63 Light Years
 46.79 Parsecs
 9,651,063.03 Astronomical Units
Galacto-Centric Distance 24,015.41 Light Years / 7,363.00 Parsecs
Proper Motion Dec.1.59000 ± 0.18000 milliarcseconds/year
Proper Motion RA.-45.16000 ± 0.31000 milliarcseconds/year
B-V Index1.08
Radial Velocity-8.48000 ± 0.19 km/s
Iron Abundance0.1400 ± 0.06 Fe/H
Semi-Major Axis7759.0000000
Stellar Luminosity (Lsun)19.8000000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)5.45
Effective Temperature4,700 Kelvin

Sources and Links

SIMBAD SourceLink

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
168387+07 3629.0A5.60000-53.00000-6.00000K0Orange

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