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DY Persei (Carbon Star) Facts

DY Persei Facts

DY Persei's Alternative Names

DY Persei has alternative name(s) :- DY Per.

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

Location of DY Persei

The location of the Carbon 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 object is compared to the celestial equator and is expressed in degrees. For DY Persei, the location is 02 35 17.1273531147 and 2 35 17.1273531147 .

Radial Velocity and Proper Motion of DY Persei

Proper Motion

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 -0.83 milliarcseconds/year towards the north and 2.34 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -38.00 km/s . 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.

Physical Properties (Colour) of DY Persei

DY Persei Colour and Temperature

DY Persei has a spectral type of C-R4+ B. This means the star is a carbon red Carbon star.

Distance to DY Persei

The Parallax of the star is given as 0.83 which gives a calculated distance to DY Persei of 3929.68 light years from the Earth or 1204.82 parsecs. It would take a spaceship travelling at the speed of light, 3929.68 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 248,510,232.22 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.

Variable Type of DY Persei

The star is a eruptive R Coronae Borealis 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.

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Additional DY Persei Facts and Figures

Visual Facts


Primary / Proper / Traditional NameDY Persei
Alternative NamesDY Per
Spectral TypeC-R4+ B
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeCarbon Star
ColourRed
GalaxyMilky Way
ConstellationPerseus
Right Ascension (R.A.)02 35 17.1273531147
Declination (Dec.)2 35 17.1273531147
Distance from Earth0.83 Parallax (milliarcseconds)
 3929.68 Light Years
 1204.82 Parsecs
 248,510,232.22 Astronomical Units
Proper Motion Dec.-0.83 milliarcseconds/year
Proper Motion RA.2.34 milliarcseconds/year
Radial Velocity-38.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeR Coronae Borealis

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=dy%20persei

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