HIP 66072 is a variable star that can be located in the constellation of Coma Berenices. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.
HIP66072 is the reference name for the star in the Hipparcos Star Catalogue.
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+23 2581.
More details on star alternative names can be found at Star Names .
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 star is compared to the celestial equator and is expressed in degrees. For HIP 66072, the location is 13h 32m 41.78 and +22° 30` 07.3 .
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 -71.24 ± 0.91 miliarcseconds/year towards the north and -132.96 ± 1.64 miliarcseconds/year east if we saw them in the horizon.
Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 0.37 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.
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||HIP 66072|
|Alternative Names||HIP 66072, BD+23 2581|
|Multiple Star System||Yes|
|Star Type||Variable Star|
|Absolute Magnitude||6.31 / 6.32|
|Visual / Apparent Magnitude||9.64|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||13h 32m 41.78|
|Declination (Dec.)||+22° 30` 07.3|
|Galactic Latitude||79.56 degrees|
|Galactic Longitude||8.87 degrees|
|1997 Distance from Earth||21.55 Parallax (milliarcseconds)|
|151.35 Light Years|
|2007 Distance from Earth||21.71 Parallax (milliarcseconds)|
|150.24 Light Years|
|Galacto-Centric Distance||24,109.99 Light Years / 7,392.00 Parsecs|
|Proper Motion Dec.||-71.24 ± 0.91 milliarcseconds/year|
|Proper Motion RA.||-132.96 ± 1.64 milliarcseconds/year|
|Stellar Luminosity (Lsun)||0.37|
|Mean Variability Period in Days||0.087|
|Variable Magnitude Range (Brighter - Dimmer)||9.728 - 9.858|
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|