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BM Persei

BM Persei Facts

  • BM Persei is a pulsating star that can be located in the constellation of Perseus. The description is based on the spectral class.
  • BM Persei is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K5 D~) of the star, the star's colour is orange to red .
  • The star is calculated at being about 15072.24 light years away from us. Distance

BM Persei's Alternative Names

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

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

Location of BM Persei

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 object is compared to the celestial equator and is expressed in degrees. For BM Persei, the location is 04 29 39.3888285450 and +48 25 19.102535927 .

Radial Velocity and Proper Motion of BM 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 -1.03 milliarcseconds/year towards the north and 0.16 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 -43.10000 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 of BM Persei

BM Persei Temperature and Colour

Based on the star's spectral type of K5 D~ , BM Persei's colour and type is orange to red star. Based on the star's spectral, the stars temperature is between 3,700.00 and 5,200.00 degrees kelvin.

Distance to BM Persei

The Parallax of the star is given as 0.21640 which gives a calculated distance to BM Persei of 15072.24 light years from the Earth or 4621.07 parsecs. It is about 88,604,052,494,712,934 miles from Earth.

The star is roughly 953,157,466.51 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.

Travel Time to BM Persei

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking42,526,923,695,069.74
Car12084,230,789,835.66
Airbus A38073613,733,280,951.47
Speed of Sound (Mach 1)767.26913,173,599,846.05
Concorde (Mach 2)1,534.546,586,791,338.30
New Horizons Probe33,000306,293,781.22
Speed of Light670,616,629.0015,072.24

Variable Type of BM Persei

The star is a pulsating Delta Cepheid 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 BM Persei Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBM Persei
Alternative NamesBM Per
Spectral TypeK5 D~
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourOrange to Red
GalaxyMilky Way
ConstellationPerseus
Right Ascension (R.A.)04 29 39.3888285450
Declination (Dec.)+48 25 19.102535927
Distance from Earth0.21640 Parallax (milliarcseconds)
 15072.24 Light Years
 4621.07 Parsecs
 953,157,466.51 Astronomical Units
Proper Motion Dec.-1.03300 milliarcseconds/year
Proper Motion RA.0.15600 milliarcseconds/year
Radial Velocity-43.10000 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid

Estimated Calculated Facts


Calculated Temperature Range3,700.00 - 5,200.00

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-basic?Ident=bm%20per

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