Universe Guide


HD 79498, HIP45406

HD 79498 is a white to yellow star that can be located in the constellation of Cancer. The star can not be seen by the naked eye, you need a telescope to see it. It is calculated at being 2.700 Billion Years old. This information comes from ExoPlanet.

HIP45406 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD79498. HD 79498 has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of HD 79498

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 79498, the location is 09h 15m 09.48 and +23d22`33.3 .

Proper Motion of HD 79498

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 -154.95 ± 0.38 miliarcseconds/year towards the north and -127.94 ± 0.63 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Metallicity, Age, Mass, Radius) of HD 79498

HD 79498 has a spectral type of G5. This means the star is a white to yellow star. The star is 7432.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24240.4597260800000000s. The star has a B-V Colour Index of 0.69 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,671 Kelvin.

HD 79498 Radius has been calculated as being 1.15 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 801,720.85.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.10. 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 1.06 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 0.240000, 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 star is believed to be about 2.70 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

HD 79498 Apparent and Absolute Magnitudes

HD 79498 has an apparent magnitude of 8.05 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 4.62 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.73. 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 79498

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 20.56 which gave the calculated distance to HD 79498 as 158.64 light years away from Earth or 48.64 parsecs. It would take a spaceship travelling at the speed of light, 158.64 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 21.69 which put HD 79498 at a distance of 150.37 light years or 46.10 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 7,432.00 Parsecs or 24,240.46 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 79498 Facts

Alternative Names

Traditional/Proper NameHD 79498
Hipparcos Library I.D.45406
Bonner DurchmusterungBD+23 2063
Henry Draper Designation79498

Visual Facts

Star Type star
Age2.70 Billion Years Old
Absolute Magnitude4.62 / 4.73
Visual / Apparent Magnitude8.05
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)09h 15m 09.48
Declination (Dec.)+23d22`33.3
Galactic Latitude41.32 degrees
Galactic Longitude204.70 degrees
1997 Distance from Earth20.56 Parallax (milliarcseconds)
 158.64 Light Years
 48.64 Parsecs
2007 Revised Distance from Earth21.69 Parallax (milliarcseconds)
 150.37 Light Years
 46.10 Parsecs
Galacto-Centric Distance24,240.46 Light Years / 7,432.00 Parsecs
Proper Motion Dec.-154.95 ± 0.38 milliarcseconds/year
Proper Motion RA.-127.94 ± 0.63 milliarcseconds/year
B-V Index0.69
Radial Velocity19.83 ± 0.23 km/s
Iron Abundance0.23 ± 0.05 Fe/H
Spectral TypeG5
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature5,671 Kelvin
Mass Compared to the Sun1.06

Sources and Links

SIMBAD SourceLink

Related Stars

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
79498+23 2063.0A8.00000-117.00000-157.00000G5Yellow
+23 2065.0C9.6000012.00000-62.000001908

List of Extrasolar Planets orbiting HD 79498

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Hd 79498 BConfirmed1.341966.0000.5920123.13221.000

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