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30 Arietis B, HD16232, HIP12184, HR764

30 Arietis B is a blue to white main sequence dwarf star that can be located in the constellation of Aries. 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 2.30 Billion of Years but could be as young as 0.30 to 3.80 according to Hipparcos. 30 Arietis B has at least 1 Extrasolar Planets believed to be in orbit around the star.

30 Arietis B's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR764. HIP12184 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD16232.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 30 Arietis B with it shortened to 30 Ari B.

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+24 375.

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

Location of 30 Arietis B

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 30 Arietis B, the location is 02h 36m 57.64 and +24° 38` 53.1 .

Proper Motion of 30 Arietis B

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 -12.79 ± 0.40 miliarcseconds/year towards the north and 150.75 ± 0.68 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 13.00000 km/s with an error of about 0.90 km/s .

30 Arietis B 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 2.15 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, Age) of 30 Arietis B

30 Arietis B has a spectral type of F4V. This means the star is a blue to white main sequence dwarf star. The star is 7,430.00 Parsecs from the Galactic Centre or terms of Light Years is 24,233.94 s. The star has a B-V Colour Index of 0.41 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,681 Kelvin.

30 Arietis B Radius has been calculated as being 1.05 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 727,217.70.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 1.08. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.22 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 2.30 Billion years old but could be between 0.30 and 3.80 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

30 Arietis B Apparent and Absolute Magnitudes

30 Arietis B has an apparent magnitude of 7.10 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 4.12 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.05. 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 B

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 25.36 which gave the calculated distance to 30 Arietis B as 128.61 light years away from Earth or 39.43 parsecs. It would take a spaceship travelling at the speed of light, 128.61 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 24.52 which put 30 Arietis B at a distance of 133.02 light years or 40.78 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 7,430.00 Parsecs or 24,233.94 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.

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30 Arietis B Facts

Visual Facts


Primary / Proper / Traditional Name30 Arietis B
Alternative NamesHD 16232, HIP 12184, HR 764, 30 Ari B, BD+24 375
Spectral TypeF4V
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour blue to white
GalaxyMilky Way
ConstellationAries
Age2.30 Billion Years Old
Age Range0.30 - 3.80 Billion Years Old
Absolute Magnitude4.12 / 4.05
Visual / Apparent Magnitude7.10
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 36m 57.64
Declination (Dec.)+24° 38` 53.1
Galactic Latitude-32.31 degrees
Galactic Longitude151.48 degrees
1997 Distance from Earth25.36 Parallax (milliarcseconds)
 128.61 Light Years
 39.43 Parsecs
2007 Distance from Earth24.52 Parallax (milliarcseconds)
 133.02 Light Years
 40.78 Parsecs
Galacto-Centric Distance24,233.94 Light Years / 7,430.00 Parsecs
Proper Motion Dec.-12.79 ± 0.40 milliarcseconds/year
Proper Motion RA.150.75 ± 0.68 milliarcseconds/year
B-V Index0.41
Radial Velocity13.00 ± 0.90 km/s
Iron Abundance0.22 ± 0.02 Fe/H
Eccentricity0.06
Semi-Major Axis7493.00
Stellar Luminosity (Lsun)2.15
Associated / Clustered Stars30 Arietis

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Facts


Calculated Effective Temperature6,681 Kelvin

Sources and Links


SIMBAD SourceLink

List of Extrasolar Planets orbiting 30 Arietis B


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
30 Ari B bConfirmed0.94335.1000.28920090.995307.0002009.000

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