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HIP 66370, HD118389

HIP 66370 is a orange to red star that can be located in the constellation of Bootes. 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 66370's Alternative Names

HIP66370 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD118389.

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+20 2848.

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

Location of HIP 66370

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 66370, the location is 13h 36m 20.47 and +19° 59` 26.2 .

Radial Velocity and Proper Motion of HIP 66370

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 -24.31 ± 0.65 miliarcseconds/year towards the north and 21.97 ± 1.10 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 -6.30 km/s with an error of about 0.60 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.

Physical Properties (Colour, Temperature) of HIP 66370

HIP 66370 has a spectral type of K5. This means the star is a orange to red star. The star has a B-V Colour Index of 1.48 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,056 Kelvin.

HIP 66370 Radius has been calculated as being 14.21 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,889,762.24.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 18.57. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 66370 Apparent and Absolute Magnitudes

HIP 66370 has an apparent magnitude of 8.73 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 0.62 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.04. 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 66370

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.39 which gave the calculated distance to HIP 66370 as 1364.70 light years away from Earth or 418.41 parsecs. It would take a spaceship travelling at the speed of light, 1364.70 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 1.83 which put HIP 66370 at a distance of 1782.31 light years or 546.45 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.

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 66370 Facts

Visual Facts


Primary / Proper / Traditional NameHIP 66370
Alternative NamesHD 118389, HIP 66370, BD+20 2848
Spectral TypeK5
Multiple Star SystemYes
Star TypeStar
Colour orange to red
GalaxyMilky Way
ConstellationBootes
Absolute Magnitude0.62 / 0.04
Visual / Apparent Magnitude8.73
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 36m 20.47
Declination (Dec.)+19° 59` 26.2
Galactic Latitude77.49 degrees
Galactic Longitude0.54 degrees
1997 Distance from Earth2.39 Parallax (milliarcseconds)
 1364.70 Light Years
 418.41 Parsecs
2007 Distance from Earth1.83 Parallax (milliarcseconds)
 1782.31 Light Years
 546.45 Parsecs
Proper Motion Dec.-24.31 ± 0.65 milliarcseconds/year
Proper Motion RA.21.97 ± 1.10 milliarcseconds/year
B-V Index1.48
Radial Velocity-6.30 ± 0.60 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature4,056 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
118389+20 2848.0A9.1000013.00000-36.00000K5Orange
B10.20000-38.00000-42.000001893

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