HIP59995 is the reference name for the star in the Hipparcos Star Catalogue.
HY Comae Berenices has alternative name(s) :- HY Com, HY Com.
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+16 2356.
More details on objects' alternative names can be found at Star Names .
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 HY Comae Berenices, the location is 12h 18m 16.02 and +16° 09` 16.1 .
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 -26.00 ± 1.04 milliarcseconds/year towards the north and -2.05 ± 1.80 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||HY Comae Berenices|
|Alternative Names||HY Com, HIP 59995, BD+16 2356, HY Com|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Variable Star|
|Absolute Magnitude||/ 1.46|
|Visual / Apparent Magnitude||10.43|
|Naked Eye Visible||Requires a 4.5 - 6 Inch Telescope - Magnitudes|
|Right Ascension (R.A.)||12h 18m 16.02|
|Declination (Dec.)||+16° 09` 16.1|
|Galactic Latitude||76.60008729 degrees|
|Galactic Longitude||266.22010498 degrees|
|1997 Distance from Earth||-1.34000 Parallax (milliarcseconds)|
|-2434.05 Light Years|
|2007 Distance from Earth||1.61000 Parallax (milliarcseconds)|
|2025.86 Light Years|
|128,114,303.74 Astronomical Units|
|Proper Motion Dec.||-26.00000 ± 1.04000 milliarcseconds/year|
|Proper Motion RA.||-2.05000 ± 1.80000 milliarcseconds/year|
|Variable Star Class||Pulsating|
|Variable Star Type||RR Lyrae type with n|
|Mean Variability Period in Days||0.449|
|Variable Magnitude Range (Brighter - Dimmer)||10.326 - 10.749|
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