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30 Arietis, HD16246, HIP12189, HR765

30 Arietis is a blue to white star that can be located in the constellation of Aries. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. It is calculated at being .910 Billion Years old. This information comes from ExoPlanet.

The Id of the star in the Yale Bright Star Catalogue is HR765. HIP12189 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD16246.

Location of 30 Arietis

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 30 Arietis, the location is 02h 37m 00.44 and +24d 38` 50.1 .

Proper Motion of 30 Arietis

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 -14.69 ± 0.32 miliarcseconds/year towards the north and 136.96 ± 0.59 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 14.30000 km/s with an error of about 0.70 km/s .

Physical Properties (Colour, Temperature, Metallicity, Age, Mass, Radius) of 30 Arietis

30 Arietis has a spectral type of F6III. This means the star is a blue to white star. The star is 7431.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24237.1980926400000000s. The star has a B-V Colour Index of 0.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,243 Kelvin.

30 Arietis Radius has been calculated as being 1.62 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,128,670.55.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.68. 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 1.22 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 0.120000, 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 0.91 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.

30 Arietis Apparent and Absolute Magnitudes

30 Arietis has an apparent magnitude of 6.48 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 3.46 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.38. 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 30 Arietis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 24.92 which gave the calculated distance to 30 Arietis as 130.88 light years away from Earth or 40.13 parsecs. It would take a spaceship travelling at the speed of light, 130.88 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 23.95 which put 30 Arietis at a distance of 136.19 light years or 41.75 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 7,431.00 Parsecs or 24,237.20 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.

30 Arietis Facts

Alternative Names

Traditional/Proper Name30 Arietis
Flamsteed Name30 Arietis
Flamsteed Short Name30 Ari
Hipparcos Library I.D.12189
Yale Bright Star Catalogue (HR) Id765
Bonner DurchmusterungBD+24 376
Henry Draper Designation16246

Visual Facts

Star Type star
Age0.91 Billion Years Old
Absolute Magnitude3.46 / 3.38
Visual / Apparent Magnitude6.48
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)02h 37m 00.44
Declination (Dec.)+24d 38` 50.1
Galactic Latitude-32.31 degrees
Galactic Longitude151.49 degrees
1997 Distance from Earth24.92 Parallax (milliarcseconds)
 130.88 Light Years
 40.13 Parsecs
2007 Revised Distance from Earth23.95 Parallax (milliarcseconds)
 136.19 Light Years
 41.75 Parsecs
Galacto-Centric Distance24,237.20 Light Years / 7,431.00 Parsecs
Proper Motion Dec.-14.69 ± 0.32 milliarcseconds/year
Proper Motion RA.136.96 ± 0.59 milliarcseconds/year
B-V Index0.51
Radial Velocity14.30 ± 0.70 km/s
Iron Abundance-0.01 ± 0.08 Fe/H
Spectral TypeF6III
Associated / Clustered Stars30 Arietis B
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature6,243 Kelvin
Mass Compared to the Sun1.22

Sources and Links

SIMBAD SourceLink

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