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YY Sagittarius, HD173140

Primary Facts on YY Sagittarius

  • YY Sagittarius's star type is eclipsing binary sys luminous giant star that can be located in the constellation of Sagittarius. The description is based on the spectral class.
  • YY Sagittarius is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B8/9II D) of the star, the star's colour is blue .
  • The star is calculated at being about 3299.24 light years away from us.

YY Sagittarius's Alternative Names

The Id of the star in the Henry Draper catalogue is HD173140.

YY Sagittarius has alternative name(s) :- YY Sgr.

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

Location of YY Sagittarius

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 star is compared to the celestial equator and is expressed in degrees. For YY Sagittarius, the location is 18 44 35.8395514834 and -19 23 23.033010890 .

Proper Motion of YY Sagittarius

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 -0.75 miliarcseconds/year towards the north and -0.58 miliarcseconds/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 (Colour) of YY Sagittarius

YY Sagittarius has a spectral type of B8/9II D. This means the star is a blue luminous giant star.

Distance to YY Sagittarius

The Parallax of the star is given as 0.99 which gives a calculated distance to YY Sagittarius of 3299.24 light years from the Earth or 1011.53 parsecs. It would take a spaceship travelling at the speed of light, 3299.24 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 208,641,585.63 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.

Variable Type of YY Sagittarius

The star is a eclipsing binary sys Beta Persei (Algol) 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.

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Additional YY Sagittarius Facts and Figures

Visual Facts


Primary / Proper / Traditional NameYY Sagittarius
Alternative NamesYY Sgr, HD 173140
Spectral TypeB8/9II D
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
Colour blue
GalaxyMilky Way
ConstellationSagittarius
Right Ascension (R.A.)18 44 35.8395514834
Declination (Dec.)-19 23 23.033010890
Distance from Earth0.99 Parallax (milliarcseconds)
 3299.24 Light Years
 1011.53 Parsecs
 208,641,585.63 Astronomical Units
Proper Motion Dec.-0.75 milliarcseconds/year
Proper Motion RA.-0.58 milliarcseconds/year

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Persei (Algol)

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=yy%20sgr

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