Universe Guide


HD 49674, HIP32916

HD 49674 is a white to yellow star that can be located in the constellation of Auriga. The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 7.10 Billion of Years but could be as young as 3.10 to 9.50 according to Hipparcos.

HIP32916 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD49674. HD 49674 has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of HD 49674

The location of the star in the galaxy 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 HD 49674, the location is 06h 51m 30.49 and +40d52`05.0 .

Proper Motion of HD 49674

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 -122.70 ± 0.47 miliarcseconds/year towards the north and 32.23 ± 0.87 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Metallicity, Age, Mass, Radius) of HD 49674

HD 49674 has a spectral type of G0. This means the star is a white to yellow star. The star is 7442.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24273.0760604800000000s. The star has a B-V Colour Index of 0.72 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,603 Kelvin.

HD 49674 Radius has been calculated as being 0.97 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 673,747.25.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.05. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 1.07 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.250000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The stars age according to Hipparcos data files put the star at an age of about 7.10 Billion years old but could be between 3.10 and 9.50 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 49674 Apparent and Absolute Magnitudes

HD 49674 has an apparent magnitude of 8.10 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 5.05 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.87. 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 49674

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 24.55 which gave the calculated distance to HD 49674 as 132.86 light years away from Earth or 40.73 parsecs. It would take a spaceship travelling at the speed of light, 132.86 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 22.61 which put HD 49674 at a distance of 144.26 light years or 44.23 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 7,442.00 Parsecs or 24,273.08 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.

HD 49674 Facts

Alternative Names

Traditional/Proper NameHD 49674
Hipparcos Library I.D.32916
Bonner DurchmusterungBD+41 1544
Henry Draper Designation49674

Visual Facts

Star Type star
Age7.10 Billion Years Old
Age Range3.10 - 9.50 Billion Years Old
Absolute Magnitude5.05 / 4.87
Visual / Apparent Magnitude8.10
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 51m 30.49
Declination (Dec.)+40d52`05.0
Galactic Latitude17.37 degrees
Galactic Longitude175.34 degrees
1997 Distance from Earth24.55 Parallax (milliarcseconds)
 132.86 Light Years
 40.73 Parsecs
2007 Revised Distance from Earth22.61 Parallax (milliarcseconds)
 144.26 Light Years
 44.23 Parsecs
Galacto-Centric Distance24,273.08 Light Years / 7,442.00 Parsecs
Proper Motion Dec.-122.70 ± 0.47 milliarcseconds/year
Proper Motion RA.32.23 ± 0.87 milliarcseconds/year
B-V Index0.72
Radial Velocity11.91 ± 0.09 km/s
Iron Abundance0.28 ± 0.02 Fe/H
Spectral TypeG0
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature5,603 Kelvin
Mass Compared to the Sun1.07

Sources and Links

SIMBAD SourceLink

Related Stars

List of Extrasolar Planets orbiting HD 49674

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Hd 49674 BConfirmed0.14.9470.049520020.058264.000

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