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V742 Cassiopeia, HD442, HIP698

Primary Facts on V742 Cassiopeia

  • V742 Cassiopeia's star type is giant star that can be located in the constellation of Tucana. The description is based on the spectral class.
  • V742 Cassiopeia is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K3III) of the star, the star's colour is orange to red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 906.01 light years away from us.

V742 Cassiopeia's Alternative Names

HIP698 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD442.

V742 Cassiopeia has alternative name(s) :- V742 Cas.

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

Location of V742 Cassiopeia

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 V742 Cassiopeia, the location is 00h 08m 38.78 and -74° 14` 18.3 .

Proper Motion of V742 Cassiopeia

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 -12.30 ± 0.42 miliarcseconds/year towards the north and -0.93 ± 0.53 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.

V742 Cassiopeia 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 143.84 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of V742 Cassiopeia

V742 Cassiopeia has a spectral type of K3III. This means the star is a orange to red giant star. The star is 7,284.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,757.74 s. The star has a B-V Colour Index of 1.3 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,322 Kelvin.

V742 Cassiopeia Radius has been calculated as being 19.30 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,428,312.72.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 15.47. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V742 Cassiopeia Apparent and Absolute Magnitudes

V742 Cassiopeia has an apparent magnitude of 7.38 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 -0.32 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.16. 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 V742 Cassiopeia

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.89 which gave the calculated distance to V742 Cassiopeia as 1128.59 light years away from Earth or 346.02 parsecs. It would take a spaceship travelling at the speed of light, 1128.59 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 3.60 which put V742 Cassiopeia at a distance of 906.01 light years or 277.78 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.

Using the 2007 distance, the star is roughly 57,295,838.64 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.

The star's Galacto-Centric Distance is 7,284.00 Parsecs or 23,757.74 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 V742 Cassiopeia Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV742 Cassiopeia
Alternative NamesV742 Cas, HD 442, HIP 698
Spectral TypeK3III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
Absolute Magnitude -0.32 / 0.16
Visual / Apparent Magnitude7.38
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)00h 08m 38.78
Declination (Dec.)-74° 14` 18.3
Galactic Latitude-42.56 degrees
Galactic Longitude306.86 degrees
1997 Distance from Earth2.89 Parallax (milliarcseconds)
 1128.59 Light Years
 346.02 Parsecs
2007 Distance from Earth3.60 Parallax (milliarcseconds)
 906.01 Light Years
 277.78 Parsecs
 57,295,838.64 Astronomical Units
Galacto-Centric Distance23,757.74 Light Years / 7,284.00 Parsecs
Proper Motion Dec.-12.30 ± 0.42 milliarcseconds/year
Proper Motion RA.-0.93 ± 0.53 milliarcseconds/year
B-V Index1.30
Stellar Luminosity (Lsun)143.84

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Facts

Calculated Effective Temperature4,322 Kelvin

Sources and Links

SIMBAD SourceLink

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