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HD 49331

HD 49331 Facts

HD 49331's Alternative Names

HIP32558 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD49331.

HD 49331 has alternative name(s) :- , NSV 03213.

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-08 1558.

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

Location of HD 49331

The location of the luminous 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 49331, the location is 06h 47m 37.22 and -08° 59` 54.6 .

Radial Velocity and Proper Motion of HD 49331

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 -1.09 ± 0.20 milliarcseconds/year towards the north and -4.98 ± 0.29 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 26.00 km/s with an error of about 1.00 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 49331

HD 49331 Colour and Temperature

HD 49331 has a spectral type of M1II. This means the star is a red luminous giant star. The star has a B-V Colour Index of 1.79 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,073 Kelvin.

HD 49331 Radius

Radius has been calculated as being 127.59 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 88,775,182.39.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 137.34. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.03 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

HD 49331 Apparent and Absolute Magnitudes

HD 49331 has an apparent magnitude of 5.08 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 -2.94 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.10. 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 49331

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.49 which gave the calculated distance to HD 49331 as 1309.89 light years away from Earth or 401.61 parsecs. If you want that in miles, it is 8,300,383,881,920,315.86.

In 2007, Hipparcos data was revised with a new parallax of 2.31 which put HD 49331 at a distance of 1411.96 light years or 432.90 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 89,291,412.43 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 7,726.00 Parsecs or 25,199.38 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Time to Travel to HD 49331

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 64,169,604,917,328.88 hours or 7,325,297,364.99 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to HD 49331 then it would take 233,344,017,881.20 hours / 26,637,444.96 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 1309.89 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

HD 49331 brightness ranges from a magnitude of 5.221 to a magnitude of 5.120 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 49331 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 49331
Alternative NamesHD 49331, HIP 32558, BD-08 1558, NSV 03213
Spectral TypeM1II
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
ColourRed
GalaxyMilky Way
ConstellationMonoceros
Absolute Magnitude -2.94 / -3.10
Visual / Apparent Magnitude5.08
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 47m 37.22
Declination (Dec.)-08° 59` 54.6
Galactic Latitude-4.93 degrees
Galactic Longitude220.53 degrees
1997 Distance from Earth2.49 Parallax (milliarcseconds)
 1309.89 Light Years
 401.61 Parsecs
2007 Distance from Earth2.31 Parallax (milliarcseconds)
 1411.96 Light Years
 432.90 Parsecs
 89,291,412.43 Astronomical Units
Galacto-Centric Distance25,199.38 Light Years / 7,726.00 Parsecs
Proper Motion Dec.-1.09 ± 0.20 milliarcseconds/year
Proper Motion RA.-4.98 ± 0.29 milliarcseconds/year
B-V Index1.79
Radial Velocity26.00 ± 1.00 km/s
Iron Abundance-0.03 ± 9.99 Fe/H
Eccentricity0.05
Semi-Major Axis8116.00

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.086
Variable Magnitude Range (Brighter - Dimmer)5.120 - 5.221

Estimated Calculated Facts


Radius (x the Sun)137.34
Effective Temperature3,073 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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