HIP72426 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD130617.
EM Bootis has alternative name(s) :- EM Boo, EM Boo.
More details on objects' alternative names can be found at Star Names .
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 2.28 ± 0.77 milliarcseconds/year towards the north and 12.16 ± 1.45 milliarcseconds/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.
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.
|Primary / Proper / Traditional Name||EM Bootis|
|Alternative Names||EM Boo, HD 130617, HIP 72426, EM Boo|
|Constellation's Main Star||No|
|Multiple Star System||Yes|
|Star Type||Variable Star|
|Galactic Latitude||63.62636808 degrees|
|Galactic Longitude||34.40346134 degrees|
|Distance from Earth||1.33000 Parallax (milliarcseconds)|
|2452.36 Light Years|
|155,085,301.87 Astronomical Units|
|Proper Motion Dec.||2.28000 ± 0.77000 milliarcseconds/year|
|Proper Motion RA.||12.16000 ± 1.45000 milliarcseconds/year|
|Variable Star Class||Eclipsing binary sys|
|Variable Star Type||Beta Persei (Algol)|
|Mean Variability Period in Days||2.446|
|Variable Magnitude Range (Brighter - Dimmer)||9.079 - 9.357|
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. Id||B.D. Id||Star Code||Magnitude||R.A.||Dec.||Spectrum||Colour||Year|
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