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HD 57646

HD 57646 Facts

HD 57646's Alternative Names

HIP35984 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD57646.

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+52 1205.

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

Location of HD 57646

The location of the giant 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 57646, the location is 07h 24m 57.08 and +51° 53` 14.4 .

Radial Velocity and Proper Motion of HD 57646

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 -35.76 ± 0.27 milliarcseconds/year towards the north and 8.16 ± 0.38 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 19.40 km/s with an error of about 1.10 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 HD 57646

HD 57646 Colour and Temperature

HD 57646 has a spectral type of K5III. This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.61 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,754 Kelvin.

HD 57646 Radius

Radius has been calculated as being 53.69 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 37,360,978.45.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 48.52. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 57646 Apparent and Absolute Magnitudes

HD 57646 has an apparent magnitude of 5.80 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 -1.93 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.71. 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 57646

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.84 which gave the calculated distance to HD 57646 as 1148.46 light years away from Earth or 352.11 parsecs. It would take a spaceship travelling at the speed of light, 1148.46 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 3.15 which put HD 57646 at a distance of 1035.44 light years or 317.46 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 65,480,369.12 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 7,673.00 Parsecs or 25,026.51 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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Additional HD 57646 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 57646
Alternative NamesHD 57646, HIP 35984, BD+52 1205
Spectral TypeK5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationLynx
Absolute Magnitude -1.93 / -1.71
Visual / Apparent Magnitude5.80
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 24m 57.08
Declination (Dec.)+51° 53` 14.4
Galactic Latitude26.03 degrees
Galactic Longitude165.74 degrees
1997 Distance from Earth2.84 Parallax (milliarcseconds)
 1148.46 Light Years
  352.11 Parsecs
2007 Distance from Earth3.15 Parallax (milliarcseconds)
 1035.44 Light Years
 317.46 Parsecs
 65,480,369.12 Astronomical Units
Galacto-Centric Distance25,026.51 Light Years / 7,673.00 Parsecs
Proper Motion Dec.-35.76 ± 0.27 milliarcseconds/year
Proper Motion RA.8.16 ± 0.38 milliarcseconds/year
B-V Index1.61
Radial Velocity19.40 ± 1.10 km/s
Eccentricity0.27
Semi-Major Axis5876.00

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)48.52
Effective Temperature3,754 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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