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Adhafera, Zeta Leonis, 36 Leonis, HD89025, HIP50335, HR4031

Adhafera (Zeta Leonis) is a blue to white giant star that can be located in the constellation of Leo. Adhafera is the brightest star in Leo based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Zeta Leonis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR4031. HIP50335 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD89025. In Arabic, it is known as Ad-Dafirah.

Location of Adhafera

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 Adhafera, the location is 10h 16m 41.40 and +23d 25` 02.4 .

Proper Motion of Adhafera

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 -6.84 ± 0.10 miliarcseconds/year towards the north and 18.39 ± 0.18 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Adhafera

Adhafera has a spectral type of F0III. This means the star is a blue to white giant star. The star is 7442.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24273.0760604800000000s. The star has a B-V Colour Index of 0.3 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,218 Kelvin.

Adhafera Radius has been calculated as being 9.82 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,832,264.61.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 10.33. 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 0.19 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Adhafera Apparent and Absolute Magnitudes

Adhafera has an apparent magnitude of 3.43 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 -1.08 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.19. 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 Adhafera

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.56 which gave the calculated distance to Adhafera as 259.68 light years away from Earth or 79.62 parsecs. It would take a spaceship travelling at the speed of light, 259.68 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 11.90 which put Adhafera at a distance of 274.09 light years or 84.03 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 7,442.00 Parsecs or 24,273.08 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Meteor Showers Radiating from near Adhafera

The Leonids Meteor Shower radiants from a point near this star. The meteor shower runs typically between November 13-20 with a peak date of Nov. 17/18. The speed of a meteor in the shower is 70 Km/s. The amount of meteors predicted to be seen per hour (Zenith Hourly Rate) is 70.

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.

Adhafera Facts

Alternative Names

Traditional/Proper NameAdhafera
Flamsteed Name36 Leonis
Flamsteed Short Name36 Leo
Arabic NameAd-Dafirah
English MeaningThe curl
Bayer DesignationZeta Leonis
Hipparcos Library I.D.50335
Yale Bright Star Catalogue (HR) Id4031
Bonner DurchmusterungBD+24 2209
Henry Draper Designation89025

Visual Facts

Star Typegiant star
Absolute Magnitude-1.08 / -1.19
Visual / Apparent Magnitude3.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)10h 16m 41.40
Declination (Dec.)+23d 25` 02.4
Galactic Latitude54.95 degrees
Galactic Longitude210.23 degrees
1997 Distance from Earth12.56 Parallax (milliarcseconds)
 259.68 Light Years
 79.62 Parsecs
2007 Revised Distance from Earth11.90 Parallax (milliarcseconds)
 274.09 Light Years
 84.03 Parsecs
Galacto-Centric Distance24,273.08 Light Years / 7,442.00 Parsecs
Proper Motion Dec.-6.84 ± 0.10 milliarcseconds/year
Proper Motion RA.18.39 ± 0.18 milliarcseconds/year
B-V Index0.30
Radial Velocity-21.40 ± 0.80 km/s
Iron Abundance0.19 ± 9.99 Fe/H
Spectral TypeF0III
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature7,218 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Adhafera in Leo

Adhafera (Zeta Leonis) Location in Leo

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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