Universe Guide

HD 4308

HD 4308 Facts

  • HD 4308 is a main sequence star that can be located in the constellation of Tucana. The description is based on the spectral class.
  • HD 4308 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G3V) of the star, the star's colour is yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star has an estimated age of 10.90 Billion of Years but could be as young as 7.40 to 14.50 according to Hipparcos.
  • HD 4308 has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 71.94 light years away from us. Distance

HD 4308's Alternative Names

HIP3497 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD4308. The Gliese ID of the star is GL 31.5. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

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

Location of HD 4308

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 4308, the location is 00h 44m 39.04 and -65° 38` 51.8 .

Radial Velocity and Proper Motion of HD 4308

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 -742.32 ± 0.27 milliarcseconds/year towards the north and 157.49 ± 0.32 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 95.25 km/s with an error of about 0.00 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 of HD 4308

HD 4308 Temperature and Colour

Based on the star's spectral type of G3V , HD 4308's colour and type is yellow main sequence star. The star has a B-V Colour Index of 0.6 which means the star's temperature is about 5,895 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 4308 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 1.13 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HD 4308 Radius

HD 4308 estimated radius has been calculated as being 0.96 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 667,379.09.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 0.97. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

HD 4308 Mass

The HD 4308's solar mass is 0.85 times that of our star, the Sun. 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.

HD 4308 Metalicity

The star's metallicity is -0.340000, 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.

HD 4308 Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 10.90 Billion years old but could be between 7.40 and 14.50 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old. The reported age is older than the widely recognised age of the Universe so a little scepticism about the age is warranted.

HD 4308 Apparent and Absolute Magnitudes

HD 4308 has an apparent magnitude of 6.55 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 4.85 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.83. 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 4308

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 45.76 which gave the calculated distance to HD 4308 as 71.28 light years away from Earth or 21.85 parsecs. If you want that in miles, it is about 419,028,416,600,527.72, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 45.34 which put HD 4308 at a distance of 71.94 light years or 22.06 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 4,550,169.92 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 7,392.00 Parsecs or 24,109.99 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 4308

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)
Airbus A38073665,549,130.83
Speed of Sound (Mach 1)767.26962,877,765.54
Concorde (Mach 2)1,534.5431,438,841.80
New Horizons Probe33,0001,461,944.25
Speed of Light670,616,629.0071.94

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 4308 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHD 4308
Alternative NamesHD 4308, HIP 3497, Gliese 31.5
Spectral TypeG3V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Age10.90 Billion Years Old
Age Range7.40 - 14.50 Billion Years Old
Absolute Magnitude 4.85 / 4.83
Visual / Apparent Magnitude6.55
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)00h 44m 39.04
Declination (Dec.)-65° 38` 51.8
Galactic Latitude-51.47 degrees
Galactic Longitude304.05 degrees
1997 Distance from Earth45.76 Parallax (milliarcseconds)
 71.28 Light Years
 21.85 Parsecs
2007 Distance from Earth45.34 Parallax (milliarcseconds)
 71.94 Light Years
 22.06 Parsecs
 4,550,169.92 Astronomical Units
Galacto-Centric Distance24,109.99 Light Years / 7,392.00 Parsecs
Proper Motion Dec.-742.32 ± 0.27 milliarcseconds/year
Proper Motion RA.157.49 ± 0.32 milliarcseconds/year
B-V Index0.60
Radial Velocity95.25 ± 0.00 km/s
Iron Abundance-0.30 ± 0.01 Fe/H
Semi-Major Axis3240.00
Stellar Luminosity (Lsun)1.13

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Calculated Facts

Radius (x the Sun)0.97
Effective Temperature5,895 Kelvin
Mass Compared to the Sun0.85

Sources and Links

SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 4308

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
HD 4308 bConfirmed0.00515.6090.2720050.118210.000

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