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HY Comae Berenices

HY Comae Berenices Facts

HY Comae Berenices's Alternative Names

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 .

Location of HY Comae Berenices

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 .

Proper Motion of HY Comae Berenices

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.

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 HY Comae Berenices Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHY Comae Berenices
Alternative NamesHY Com, HIP 59995, BD+16 2356, HY Com
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
ConstellationComa Berenices
Absolute Magnitude / 1.46
Visual / Apparent Magnitude10.43
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)12h 18m 16.02
Declination (Dec.)+16° 09` 16.1
Galactic Latitude76.60 degrees
Galactic Longitude266.22 degrees
1997 Distance from Earth-1.34 Parallax (milliarcseconds)
 -2434.05 Light Years
 -746.27 Parsecs
2007 Distance from Earth1.61 Parallax (milliarcseconds)
 2025.86 Light Years
 621.12 Parsecs
 128,114,303.74 Astronomical Units
Proper Motion Dec.-26.00 ± 1.04 milliarcseconds/year
Proper Motion RA.-2.05 ± 1.80 milliarcseconds/year
B-V Index0.21

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with n
Mean Variability Period in Days0.449
Variable Magnitude Range (Brighter - Dimmer)10.326 - 10.749

Sources and Links


SIMBAD SourceLink

Related Stars


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