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18 Ophiuchi

18 Ophiuchi Facts

  • 18 Ophiuchi is a star that can be located in the constellation of Ophiuchus. The description is based on the spectral class.
  • 18 Ophiuchi is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A1mA3/5-A7 C) of the star, the star's colour is blue - white .

18 Ophiuchi's Alternative Names

The Id of the star in the Henry Draper catalogue is HD151659.

18 Ophiuchi has alternative name(s) :- 18 Oph.

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

Location of 18 Ophiuchi

The location of the 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 18 Ophiuchi, the location is 16h 49m 44.4388 and -24° 38` 26.691 .

Proper Motion of 18 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 -25.60 milliarcseconds/year towards the north and -3.30 milliarcseconds/year east if we saw them in the horizon. . 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 18 Ophiuchi

18 Ophiuchi Temperature and Colour

Based on the star's spectral type of A1mA3/5-A7 C , 18 Ophiuchi's colour and type is blue - white star. Based on the star's spectral, the stars temperature is between 7,500.00 and 10,000.00 degrees kelvin.

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Additional 18 Ophiuchi Facts and Figures

Visual Facts


Primary / Proper / Traditional Name18 Ophiuchi
Alternative Names18 Oph, HD 151659
Spectral TypeA1mA3/5-A7 C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourBlue
GalaxyMilky Way
ConstellationOphiuchus
Right Ascension (R.A.)16h 49m 44.4388
Declination (Dec.)-24° 38` 26.691
Proper Motion Dec.-25.60000 milliarcseconds/year
Proper Motion RA.-3.30000 milliarcseconds/year

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Calculated Temperature Range7,500.00 - 10,000.00

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=hd151659

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