Universe Guide
HomeAliensConstellationsTelevision and Films ListFact ListGames ListWarcraftSearchTwitterFacebook

HD 66428, HIP39417

HD 66428 is a white to yellow star that can be located in the constellation of Monoceros. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 9.60 Billion of Years but could be as young as 6.60 to 11.40 according to Hipparcos. HD 66428 has at least 1 Extrasolar Planets believed to be in orbit around the star.

HD 66428's Alternative Names

HIP39417 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD66428.

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-00 1891.

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

Location of HD 66428

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For HD 66428, the location is 08h 03m 28.71 and -01° 09` 43.9 .

Proper Motion of HD 66428

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 -207.18 ± 0.50 miliarcseconds/year towards the north and -67.78 ± 1.07 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 44.12000 km/s with an error of about 0.09 km/s .

HD 66428 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 1.38 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, Metallicity, Age, Mass) of HD 66428

HD 66428 has a spectral type of G5. This means the star is a white to yellow star. The star is 7,439.00 Parsecs from the Galactic Centre or terms of Light Years is 24,263.29 s. The star has a B-V Colour Index of 0.71 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,626 Kelvin.

HD 66428 Radius has been calculated as being 1.21 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 841,286.08.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 1.21. 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 1.15 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 0.310000, 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 9.60 Billion years old but could be between 6.60 and 11.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 66428 Apparent and Absolute Magnitudes

HD 66428 has an apparent magnitude of 8.25 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 4.55 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.55. 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 66428

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 18.17 which gave the calculated distance to HD 66428 as 179.51 light years away from Earth or 55.04 parsecs. It would take a spaceship travelling at the speed of light, 179.51 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 18.21 which put HD 66428 at a distance of 179.11 light years or 54.91 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 7,439.00 Parsecs or 24,263.29 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

HD 66428 Facts

Visual Facts


Primary / Proper / Traditional NameHD 66428
Alternative NamesHD 66428, HIP 39417, BD-00 1891
Spectral TypeG5
Multiple Star SystemNo / Unknown
Star TypeStar
Colour white to yellow
GalaxyMilky Way
ConstellationMonoceros
Age9.60 Billion Years Old
Age Range6.60 - 11.40 Billion Years Old
Metalicity0.3100
Absolute Magnitude4.55 / 4.55
Visual / Apparent Magnitude8.25
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 03m 28.71
Declination (Dec.)-01° 09` 43.9
Galactic Latitude15.42 degrees
Galactic Longitude222.43 degrees
1997 Distance from Earth18.17 Parallax (milliarcseconds)
 179.51 Light Years
 55.04 Parsecs
2007 Distance from Earth18.21 Parallax (milliarcseconds)
 179.11 Light Years
 54.91 Parsecs
Galacto-Centric Distance24,263.29 Light Years / 7,439.00 Parsecs
Proper Motion Dec.-207.18 ± 0.50 milliarcseconds/year
Proper Motion RA.-67.78 ± 1.07 milliarcseconds/year
B-V Index0.71
Radial Velocity44.12 ± 0.09 km/s
Iron Abundance0.25 ± 0.03 Fe/H
Eccentricity0.41
Semi-Major Axis4828.00
Stellar Luminosity (Lsun)1.38

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Facts


Calculated Effective Temperature5,626 Kelvin
Mass Compared to the Sun1.15

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting HD 66428


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
HD 66428 bConfirmed0.0271973.0000.46520063.18152.9002006.000

Related Stars


Add a Comment


Name:
Email: (Optional)
Comment: