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HD 116890

HD 116890 Facts

HD 116890's Alternative Names

HIP65755 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD116890.

HD 116890 has alternative name(s) :- EZ Mus, EZ Mus.

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

Location of HD 116890

The location of the main sequence 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 HD 116890, the location is 13h 28m 46.82 and -69° 37` 37.6 .

Radial Velocity and Proper Motion of HD 116890

Proper Motion

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 -16.04 ± 0.33 milliarcseconds/year towards the north and -21.51 ± 0.47 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

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 2.90 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.

HD 116890 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 122.71 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 HD 116890

HD 116890 Colour and Temperature

HD 116890 has a spectral type of B8V. This means the star is a blue main sequence star. The star has a B-V Colour Index of -0.01 which means the star's temperature is about 9,679 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

HD 116890 Radius

Radius has been calculated as being 4.14 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,882,249.44.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 3.64. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 116890 Apparent and Absolute Magnitudes

HD 116890 has an apparent magnitude of 6.17 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 -0.48 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.20. 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 HD 116890

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.67 which gave the calculated distance to HD 116890 as 698.42 light years away from Earth or 214.13 parsecs. If you want that in miles, it is 468,372,066,026.

In 2007, Hipparcos data was revised with a new parallax of 5.33 which put HD 116890 at a distance of 611.94 light years or 187.62 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 38,699,133.29 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 7,292.00 Parsecs or 23,783.83 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to HD 116890

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4102,594,284,987.57
Car1203,419,809,499.59
Airbus A380736557,577,635.80
Speed of Sound (Mach 1)767.269534,854,320.91
Concorde (Mach 2)1,534.54267,426,811.91
New Horizons Probe33,00012,435,670.91
Speed of Light670,616,629.00611.94

Variable Type of HD 116890

The star is a rotating Alpha2 Canum Venatic variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. HD 116890 brightness ranges from a magnitude of 6.231 to a magnitude of 6.161 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 4.3 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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Additional HD 116890 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 116890
Alternative NamesEZ Mus, HD 116890, HIP 65755, EZ Mus
Spectral TypeB8V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationMusca
Absolute Magnitude -0.48 / -0.20
Visual / Apparent Magnitude6.17
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 28m 46.82
Declination (Dec.)-69° 37` 37.6
Galactic Latitude-6.99 degrees
Galactic Longitude306.19 degrees
1997 Distance from Earth4.67 Parallax (milliarcseconds)
 698.42 Light Years
 214.13 Parsecs
2007 Distance from Earth5.33 Parallax (milliarcseconds)
 611.94 Light Years
 187.62 Parsecs
 38,699,133.29 Astronomical Units
Galacto-Centric Distance23,783.83 Light Years / 7,292.00 Parsecs
Proper Motion Dec.-16.04 ± 0.33 milliarcseconds/year
Proper Motion RA.-21.51 ± 0.47 milliarcseconds/year
B-V Index-0.01
Radial Velocity16.40 ± 2.90 km/s
Eccentricity0.12
Semi-Major Axis6557.00
Stellar Luminosity (Lsun)122.71

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venatic
Mean Variability Period in Days4.326
Variable Magnitude Range (Brighter - Dimmer)6.161 - 6.231

Estimated Calculated Facts


Radius (x the Sun)3.64
Effective Temperature9,679 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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