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HIP 66066, HD117817

HIP 66066 is a blue to white star that can be located in the constellation of Coma Berenices. The description is based on the spectral class. HIP 66066 is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 1.10 Billion of Years but could be as young as 1.00 to 1.20 according to Hipparcos.

HIP 66066's Alternative Names

HIP66066 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD117817.

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+15 2591.

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

Location of HIP 66066

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 66066, the location is 13h 32m 36.33 and +14° 23` 39.0 .

Radial Velocity and Proper Motion of HIP 66066

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 19.94 ± 0.29 miliarcseconds/year towards the north and -88.43 ± 0.50 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -16.40 km/s with an error of about 0.70 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.

HIP 66066 Luminosity

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 8.31 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature, Age) of HIP 66066

HIP 66066 has a spectral type of F0. This means the star is a blue to white star. The star is 7,378.00 Parsecs from the Galactic Centre or terms of Light Years is 24,064.33 s. The star has a B-V Colour Index of 0.35 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,575 Kelvin.

HIP 66066 Radius has been calculated as being 2.46 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,712,274.71.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.28. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.13 with an error value of 0.15 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.10 Billion years old but could be between 1.00 and 1.20 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HIP 66066 Apparent and Absolute Magnitudes

HIP 66066 has an apparent magnitude of 7.13 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 2.33 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.50. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number. }

Distance to HIP 66066

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.95 which gave the calculated distance to HIP 66066 as 297.87 light years away from Earth or 91.32 parsecs. It would take a spaceship travelling at the speed of light, 297.87 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 11.84 which put HIP 66066 at a distance of 275.48 light years or 84.46 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Using the 2007 distance, the star is roughly 17,421,004.14 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,378.00 Parsecs or 24,064.33 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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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HIP 66066 Facts

Visual Facts


Primary / Proper / Traditional NameHIP 66066
Alternative NamesHD 117817, HIP 66066, BD+15 2591
Spectral TypeF0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
Colour blue to white
GalaxyMilky Way
ConstellationComa Berenices
Age1.10 Billion Years Old
Age Range1.00 - 1.20 Billion Years Old
Absolute Magnitude 2.33 / 2.50
Visual / Apparent Magnitude7.13
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 32m 36.33
Declination (Dec.)+14° 23` 39.0
Galactic Latitude74.06 degrees
Galactic Longitude341.98 degrees
1997 Distance from Earth10.95 Parallax (milliarcseconds)
 297.87 Light Years
 91.32 Parsecs
2007 Distance from Earth11.84 Parallax (milliarcseconds)
 275.48 Light Years
 84.46 Parsecs
 17,421,004.14 Astronomical Units
Galacto-Centric Distance24,064.33 Light Years / 7,378.00 Parsecs
Proper Motion Dec.19.94 ± 0.29 milliarcseconds/year
Proper Motion RA.-88.43 ± 0.50 milliarcseconds/year
B-V Index0.35
Radial Velocity-16.40 ± 0.70 km/s
Iron Abundance0.13 ± 0.15 Fe/H
Eccentricity0.11
Semi-Major Axis7473.00
Stellar Luminosity (Lsun)8.31

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature6,575 Kelvin

Sources and Links


SIMBAD SourceLink

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