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BM Puppis

BM Puppis Facts

BM Puppis's Alternative Names

HIP38241 is the reference name for the star in the Hipparcos Star Catalogue.

BM Puppis has alternative name(s) :- BM Pup, BM Pup.

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

Location of BM Puppis

The location of the variable 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 Puppis, the location is 07h 50m 03.13 and -28° 15` 18.6 .

Radial Velocity and Proper Motion of BM Puppis

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 ± 3.24 milliarcseconds/year towards the north and -10.69 ± 4.49 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 64.40 km/s with an error of about 0.90 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.

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 BM Puppis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBM Puppis
Alternative NamesBM Pup, HIP 38241, BM Pup
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeVariable Star
GalaxyMilky Way
ConstellationPuppis
Absolute Magnitude 5.26 / 1.18
Visual / Apparent Magnitude10.86
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)07h 50m 03.13
Declination (Dec.)-28° 15` 18.6
Galactic Latitude-1.01 degrees
Galactic Longitude244.47 degrees
1997 Distance from Earth7.53 Parallax (milliarcseconds)
 433 Light Years
 132 Parsecs
2007 Distance from Earth1.16 Parallax (milliarcseconds)
 2811 Light Years
 862 Parsecs
 177,799,024.06 Astronomical Units
Proper Motion Dec.-1.03 ± 3.24 milliarcseconds/year
Proper Motion RA.-10.69 ± 4.49 milliarcseconds/year
B-V Index0.91
Radial Velocity64.40 ± 0.90 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days7.198
Variable Magnitude Range (Brighter - Dimmer)10.471 - 11.242

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
-27 4605.2A11.30000-12.000008.00000
B12.80000-12.000008.000001991

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