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43 Cassiopeiae, HD10221, HIP7965, HR478

43 Cassiopeiae is a blue rotating 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.

The Id of the star in the Yale Bright Star Catalogue is HR478. HIP7965 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD10221.

43 Cassiopeiae has alternative name(s), V557 Cas.

Location of 43 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 43 Cassiopeiae, the location is 01h 42m 20.44 and +68d 02` 35.0 .

Proper Motion of 43 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 -10.04 ± 0.40 miliarcseconds/year towards the north and 52.54 ± 0.50 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 5.10000 km/s with an error of about 2.90 km/s .

43 Cassiopeiae Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 50600.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 43 Cassiopeiae

43 Cassiopeiae has a spectral type of A0p SiSr. This means the star is a blue star. The star is 7473.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24374.1866971200000000s. The star has a B-V Colour Index of -0.04 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,437 Kelvin.

43 Cassiopeiae Radius has been calculated as being 2.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,732,864.36.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.18. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

43 Cassiopeiae Apparent and Absolute Magnitudes

43 Cassiopeiae has an apparent magnitude of 5.57 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 -0.10 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.19. 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 43 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.34 which gave the calculated distance to 43 Cassiopeiae as 444.36 light years away from Earth or 136.24 parsecs. It would take a spaceship travelling at the speed of light, 444.36 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 8.39 which put 43 Cassiopeiae at a distance of 388.75 light years or 119.19 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.

The star's Galacto-Centric Distance is 7,473.00 Parsecs or 24,374.19 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of 43 Cassiopeiae

The star is a rotating Alpha2 Canum Venaticorum 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. 43 Cassiopeiae brightness ranges from a magnitude of 5.561 to a magnitude of 5.522 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.2 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.

43 Cassiopeiae Facts

Alternative Names

Traditional/Proper Name43 Cassiopeiae
Flamsteed Name43 Cassiopeiae
Flamsteed Short Name43 Cas
Short NameV557 Cas
Hipparcos Library I.D.7965
Yale Bright Star Catalogue (HR) Id478
Bonner DurchmusterungBD+67 149
Henry Draper Designation10221

Visual Facts

Star Type star
Absolute Magnitude-0.10 / 0.19
Visual / Apparent Magnitude5.57
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)01h 42m 20.44
Declination (Dec.)+68d 02` 35.0
Galactic Latitude5.64 degrees
Galactic Longitude127.68 degrees
1997 Distance from Earth7.34 Parallax (milliarcseconds)
 444.36 Light Years
 136.24 Parsecs
2007 Revised Distance from Earth8.39 Parallax (milliarcseconds)
 388.75 Light Years
 119.19 Parsecs
Galacto-Centric Distance24,374.19 Light Years / 7,473.00 Parsecs
Proper Motion Dec.-10.04 ± 0.40 milliarcseconds/year
Proper Motion RA.52.54 ± 0.50 milliarcseconds/year
B-V Index-0.04
Radial Velocity5.10 ± 2.90 km/s
Spectral TypeA0p SiSr
Colour(A) blue

Variable Star Details

Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days3.155
Variable Magnitude Range (Brighter - Dimmer)5.522 - 5.561

Estimated Facts

Luminosity (x the Sun)50,600.0000000
Calculated Effective Temperature11,437 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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