Universe Guide
SearchTwitterComments

HD 49268

HD 49268 Facts

HD 49268's Alternative Names

HIP31977 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD49268.

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

Location of HD 49268

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 49268, the location is 06h 40m 57.56 and -71° 46` 30.3 .

Radial Velocity and Proper Motion of HD 49268

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 -40.23 ± 0.31 milliarcseconds/year towards the north and 21.03 ± 0.31 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 20.60 km/s with an error of about 0.40 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 49268 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 59.75 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 49268

HD 49268 Colour and Temperature

HD 49268 has a spectral type of K1IIICN.... This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.11 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,646 Kelvin.

HD 49268 Radius

Radius has been calculated as being 9.61 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,686,837.66.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 9.57. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HD 49268 Apparent and Absolute Magnitudes

HD 49268 has an apparent magnitude of 6.50 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 0.88 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.89. 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 49268

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.53 which gave the calculated distance to HD 49268 as 433.15 light years away from Earth or 132.80 parsecs. It would take a spaceship travelling at the speed of light, 433.15 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 7.55 which put HD 49268 at a distance of 432.00 light years or 132.45 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.

Using the 2007 distance, the star is roughly 27,319,583.22 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 7,375.00 Parsecs or 24,054.55 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.

Hide Explanations
Show GridLines

Additional HD 49268 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 49268
Alternative NamesHD 49268, HIP 31977
Spectral TypeK1IIICN...
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationVolans
Absolute Magnitude 0.88 / 0.89
Visual / Apparent Magnitude6.50
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 40m 57.56
Declination (Dec.)-71° 46` 30.3
Galactic Latitude-26.48 degrees
Galactic Longitude282.50 degrees
1997 Distance from Earth7.53 Parallax (milliarcseconds)
 433.15 Light Years
 132.80 Parsecs
2007 Distance from Earth7.55 Parallax (milliarcseconds)
 432.00 Light Years
 132.45 Parsecs
 27,319,583.22 Astronomical Units
Galacto-Centric Distance24,054.55 Light Years / 7,375.00 Parsecs
Proper Motion Dec.-40.23 ± 0.31 milliarcseconds/year
Proper Motion RA.21.03 ± 0.31 milliarcseconds/year
B-V Index1.11
Radial Velocity20.60 ± 0.40 km/s
Eccentricity0.23
Semi-Major Axis7358.00
Stellar Luminosity (Lsun)59.75

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)9.57
Effective Temperature4,646 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
49268-71 476.4A6.5000032.00000-54.00000K0Orange
B10.000001900

Related Stars


Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

   
x
This website is using cookies. More info. That's Fine