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HIP 66263, HD118388

HIP 66263 is a blue to white variable star that can be located in the constellation of Draco. 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.

HIP 66263's Alternative Names

HIP66263 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD118388.

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+65 946.

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

Location of HIP 66263

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 66263, the location is 13h 34m 50.36 and +65° 15` 18.6 .

Proper Motion of HIP 66263

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 -58.36 ± 0.47 miliarcseconds/year towards the north and 47.43 ± 0.56 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 us is -11.00000 km/s with an error of about 25.30 km/s .

HIP 66263 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 6.44 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) of HIP 66263

HIP 66263 has a spectral type of F2. This means the star is a blue to white variable star. The star is 7,430.00 Parsecs from the Galactic Centre or terms of Light Years is 24,233.94 s. The star has a B-V Colour Index of 0.45 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,248 Kelvin.

HIP 66263 Radius has been calculated as being 2.02 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,405,647.85.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 2.20. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 66263 Apparent and Absolute Magnitudes

HIP 66263 has an apparent magnitude of 7.95 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 2.98 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.79. 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 66263

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.12 which gave the calculated distance to HIP 66263 as 322.30 light years away from Earth or 98.81 parsecs. It would take a spaceship travelling at the speed of light, 322.30 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 9.30 which put HIP 66263 at a distance of 350.71 light years or 107.53 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.

The star's Galacto-Centric Distance is 7,430.00 Parsecs or 24,233.94 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. HIP 66263 brightness ranges from a magnitude of 8.059 to a magnitude of 8.029 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 days (variability).

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 66263 Facts

Visual Facts


Primary / Proper / Traditional NameHIP 66263
Alternative NamesHD 118388, HIP 66263, BD+65 946
Spectral TypeF2
Multiple Star SystemYes
Star TypeVariable Star
Colour blue to white
GalaxyMilky Way
ConstellationDraco
Absolute Magnitude2.98 / 2.79
Visual / Apparent Magnitude7.95
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 34m 50.36
Declination (Dec.)+65° 15` 18.6
Galactic Latitude51.26 degrees
Galactic Longitude115.70 degrees
1997 Distance from Earth10.12 Parallax (milliarcseconds)
 322.30 Light Years
 98.81 Parsecs
2007 Distance from Earth9.30 Parallax (milliarcseconds)
 350.71 Light Years
 107.53 Parsecs
Galacto-Centric Distance24,233.94 Light Years / 7,430.00 Parsecs
Proper Motion Dec.-58.36 ± 0.47 milliarcseconds/year
Proper Motion RA.47.43 ± 0.56 milliarcseconds/year
B-V Index0.45
Radial Velocity-11.00 ± 25.30 km/s
Eccentricity0.25
Semi-Major Axis8251.00
Stellar Luminosity (Lsun)6.44

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.581
Variable Magnitude Range (Brighter - Dimmer)8.029 - 8.059

Estimated Facts


Calculated Effective Temperature6,248 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

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. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
118388+65 946.0A7.7000032.00000-52.00000F2Yellow/White
B14.000001971

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