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Y Scuti, HIP91366

Y Scuti is a white to yellow pulsating variable star that can be located in the constellation of Scutum. The description is based on the spectral class. Y Scuti is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

Y Scuti's Alternative Names

HIP91366 is the reference name for the star in the Hipparcos Star Catalogue.

Y Scuti has alternative name(s) :- , Y Sct.

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-08 4663.

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

Location of Y Scuti

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 Y Scuti, the location is 18h 38m 03.31 and -08° 22` 08.1 .

Physical Properties (Colour, Temperature) of Y Scuti

Y Scuti has a spectral type of G1. This means the star is a white to yellow variable star. The star has a B-V Colour Index of 1.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,014 Kelvin.

Y Scuti Apparent and Absolute Magnitudes

Y Scuti has an apparent magnitude of 9.49 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 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 Y Scuti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.00 which gave the calculated distance to Y Scuti as -1 light years away from Earth or -1 parsecs. It would take a spaceship travelling at the speed of light, -1 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of Y Scuti

The star is a pulsating Delta Cepheid 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. Y Scuti brightness ranges from a magnitude of 10.072 to a magnitude of 9.459 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 10.3 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.

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Y Scuti Facts

Visual Facts


Primary / Proper / Traditional NameY Scuti
Alternative NamesHIP 91366, BD-08 4663, Y Sct
Spectral TypeG1
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour white to yellow
GalaxyMilky Way
ConstellationScutum
Visual / Apparent Magnitude9.49
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 38m 03.31
Declination (Dec.)-08° 22` 08.1
Galactic Latitude-0.86 degrees
Galactic Longitude23.96 degrees
Distance from Earth0.00 Parallax (milliarcseconds)
 -1 Light Years
 -1 Parsecs
B-V Index1.50
Radial Velocity17.80 ± 2.60 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days10.341
Variable Magnitude Range (Brighter - Dimmer)9.459 - 10.072

Estimated Facts


Calculated Effective Temperature4,014 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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