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Plasketts Star, HD47129, HIP31646

Plasketts Star is a blue pulsating variable star that can be located in the constellation of Monoceros. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Plasketts Star's Alternative Names

HIP31646 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD47129.

Plasketts Star has alternative name(s) :- , V640 Mon.

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+06 1309.

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

Location of Plasketts Star

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 Plasketts Star, the location is 06h 37m 24.04 and +06° 08` 07.4 .

Physical Properties (Colour, Temperature) of Plasketts Star

Plasketts Star has a spectral type of O8e. This means the star is a blue variable star. The star has a B-V Colour Index of 0.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,051 Kelvin.

Plasketts Star Apparent and Absolute Magnitudes

Plasketts Star has an apparent magnitude of 6.05 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 Plasketts Star

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.74 which gave the calculated distance to Plasketts Star as -4407.61 light years away from Earth or -1351.35 parsecs. It would take a spaceship travelling at the speed of light, -4407.61 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of Plasketts Star

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. Plasketts Star brightness ranges from a magnitude of 6.092 to a magnitude of 6.030 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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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Plasketts Star Facts

Visual Facts

Primary / Proper / Traditional NamePlasketts Star
Alternative NamesHD 47129, HIP 31646, BD+06 1309, V640 Mon
Spectral TypeO8e
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue
GalaxyMilky Way
Visual / Apparent Magnitude6.05
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 37m 24.04
Declination (Dec.)+06° 08` 07.4
Galactic Latitude-0.31 degrees
Galactic Longitude205.87 degrees
Distance from Earth-0.74 Parallax (milliarcseconds)
 -4407.61 Light Years
 -1351.35 Parsecs
B-V Index0.01
Radial Velocity23.50 ± 1.80 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.050
Variable Magnitude Range (Brighter - Dimmer)6.030 - 6.092

Estimated Facts

Calculated Effective Temperature10,051 Kelvin

Sources and Links

SIMBAD SourceLink

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