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YY Ursae Majoris, HD84034, HIP47756

Primary Facts on YY Ursae Majoris

  • YY Ursae Majoris's star type is pulsating variable star that can be located in the constellation of Ursa Major. The description is based on the spectral class.
  • YY Ursae Majoris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M6) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 1853.20 light years away from us.

YY Ursae Majoris's Alternative Names

HIP47756 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD84034.

YY Ursae Majoris has alternative name(s) :- , YY UMa.

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+54 1327.

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

Location of YY Ursae Majoris

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 Ursae Majoris, the location is 09h 44m 07.88 and +53° 46` 00.4 .

Physical Properties (Colour, Temperature) of YY Ursae Majoris

YY Ursae Majoris has a spectral type of M6. This means the star is a red variable star. The star has a B-V Colour Index of 1.56 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,878 Kelvin.

YY Ursae Majoris Radius has been calculated as being 20.03 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,937,071.67.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

YY Ursae Majoris Apparent and Absolute Magnitudes

YY Ursae Majoris has an apparent magnitude of 8.84 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 0.07 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 YY Ursae Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.76 which gave the calculated distance to YY Ursae Majoris as 1853.20 light years away from Earth or 568.18 parsecs. It would take a spaceship travelling at the speed of light, 1853.20 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of YY Ursae Majoris

The star is a pulsating Semiregular late- (M 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. YY Ursae Majoris brightness ranges from a magnitude of 9.383 to a magnitude of 8.547 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 295.0 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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Additional YY Ursae Majoris Facts and Figures

Visual Facts

Primary / Proper / Traditional NameYY Ursae Majoris
Alternative NamesHD 84034, HIP 47756, BD+54 1327, YY UMa
Spectral TypeM6
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
ConstellationUrsa Major
Absolute Magnitude 0.07
Visual / Apparent Magnitude8.84
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)09h 44m 07.88
Declination (Dec.)+53° 46` 00.4
Galactic Latitude46.70 degrees
Galactic Longitude161.87 degrees
Distance from Earth1.76 Parallax (milliarcseconds)
 1853.20 Light Years
 568.18 Parsecs
 117,194,720.99 Astronomical Units
B-V Index1.56

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M
Mean Variability Period in Days295.000
Variable Magnitude Range (Brighter - Dimmer)8.547 - 9.383

Estimated Facts

Calculated Effective Temperature3,878 Kelvin

Sources and Links

SIMBAD SourceLink

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