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AO Cassiopeiae, HD1337, HIP1415, HR65

AO Cassiopeiae is a blue rotating giant star that can be located in the constellation of Cassiopeia. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

AO Cassiopeiae's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR65. HIP1415 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD1337.

AO Cassiopeiae has alternative name(s) :- , AO Cas.

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+50 46.

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

Location of AO Cassiopeiae

The location of the star in the galaxy 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 AO Cassiopeiae, the location is 00h 17m 43.07 and +51° 25` 59.1 .

Proper Motion of AO Cassiopeiae

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 -1.76 ± 0.23 miliarcseconds/year towards the north and -3.98 ± 0.44 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -31.10000 km/s with an error of about 0.90 km/s .

Physical Properties (Colour, Temperature) of AO Cassiopeiae

AO Cassiopeiae has a spectral type of O9IIInn. This means the star is a blue giant star. The star has a B-V Colour Index of -0.1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,677 Kelvin.

AO Cassiopeiae Radius has been calculated as being 24.00 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 16,702,267.59.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 10.05. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

AO Cassiopeiae Apparent and Absolute Magnitudes

AO Cassiopeiae has an apparent magnitude of 6.11 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 -5.11 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.22. 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 AO Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.57 which gave the calculated distance to AO Cassiopeiae as 5722.16 light years away from Earth or 1754.39 parsecs. It would take a spaceship travelling at the speed of light, 5722.16 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 1.36 which put AO Cassiopeiae at a distance of 2398.26 light years or 735.29 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.

Variable Type of AO Cassiopeiae

The star is a rotating Rotating ellipsoidal 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. AO Cassiopeiae brightness ranges from a magnitude of 6.168 to a magnitude of 6.017 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.5 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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AO Cassiopeiae Facts

Visual Facts

Alternative NamesHD 1337, HIP 1415, HR 65, BD+50 46, AO Cas
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-5.11 / -3.22
Visual / Apparent Magnitude6.11
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)00h 17m 43.07
Declination (Dec.)+51° 25` 59.1
Galactic Latitude-11.09 degrees
Galactic Longitude117.59 degrees
1997 Distance from Earth0.57 Parallax (milliarcseconds)
 5722.16 Light Years
 1754.39 Parsecs
2007 Revised Distance from Earth1.36 Parallax (milliarcseconds)
 2398.26 Light Years
 735.29 Parsecs
Proper Motion Dec.-1.76 ± 0.23 milliarcseconds/year
Proper Motion RA.-3.98 ± 0.44 milliarcseconds/year
B-V Index-0.10
Radial Velocity-31.10 ± 0.90 km/s
Spectral TypeO9IIInn
Colour(O) blue

Variable Star Details

Variable Star ClassRotating
Variable Star TypeRotating ellipsoidal
Mean Variability Period in Days3.524
Variable Magnitude Range (Brighter - Dimmer)6.017 - 6.168

Estimated Facts

Calculated Effective Temperature11,677 Kelvin

Sources and Links

SIMBAD SourceLink

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