Universe Guide

Gamma1 Normae

Gamma1 Normae Facts

Gamma1 Normae's Alternative Names

Gamma1 Normae (Gam01 Nor) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR6058. HIP79790 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD146143.

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

Location of Gamma1 Normae

The location of the supergiant 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 object is compared to the celestial equator and is expressed in degrees. For Gamma1 Normae, the location is 16h 17m 00.94 and -50° 04` 05.2 .

Radial Velocity and Proper Motion of Gamma1 Normae

Proper Motion

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 -3.39 ± 0.17 milliarcseconds/year towards the north and -1.69 ± 0.27 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -16.00 km/s with an error of about 5.10 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Gamma1 Normae 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 2,039.91 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) of Gamma1 Normae

Gamma1 Normae Colour and Temperature

Gamma1 Normae has a spectral type of F9Ia. This means the star is a yellow to white supergiant star. The star has a B-V Colour Index of 0.78 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,467 Kelvin.

Gamma1 Normae Radius

Radius has been calculated as being 46.50 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 32,353,523.83.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 47.58. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Gamma1 Normae Apparent and Absolute Magnitudes

Gamma1 Normae has an apparent magnitude of 4.97 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 -3.25 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.30. 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 Gamma1 Normae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.27 which gave the calculated distance to Gamma1 Normae as 1436.84 light years away from Earth or 440.53 parsecs. It would take a spaceship travelling at the speed of light, 1436.84 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 2.22 which put Gamma1 Normae at a distance of 1469.20 light years or 450.45 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.

Using the 2007 distance, the star is roughly 92,911,334.56 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,008.00 Parsecs or 22,857.53 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 Gamma1 Normae

The Gamma Normids Meteor Shower radiants from a point near this star. The meteor shower runs typically between Feb 25 - Mar 22 with a peak date of Mar 13. The speed of a meteor in the shower is -56 Km/s. The amount of meteors predicted to be seen per hour (Zenith Hourly Rate) is -56.

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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Additional Gamma1 Normae Facts and Figures

Visual Facts

Primary / Proper / Traditional NameGamma1 Normae
Alternative NamesGam01 Nor, HD 146143, HIP 79790, HR 6058
Spectral TypeF9Ia
Constellation's Main StarNo
Multiple Star SystemYes
Star Type very luminous Supergiant Star
ColourYellow - White
GalaxyMilky Way
Absolute Magnitude -3.25 / -3.30
Visual / Apparent Magnitude4.97
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 17m 00.94
Declination (Dec.)-50° 04` 05.2
Galactic Latitude0.39 degrees
Galactic Longitude333.04 degrees
1997 Distance from Earth2.27 Parallax (milliarcseconds)
 1436.84 Light Years
 440.53 Parsecs
2007 Distance from Earth2.22 Parallax (milliarcseconds)
 1469.20 Light Years
 450.45 Parsecs
 92,911,334.56 Astronomical Units
Galacto-Centric Distance22,857.53 Light Years / 7,008.00 Parsecs
Proper Motion Dec.-3.39 ± 0.17 milliarcseconds/year
Proper Motion RA.-1.69 ± 0.27 milliarcseconds/year
B-V Index0.78
Radial Velocity-16.00 ± 5.10 km/s
Semi-Major Axis7672.00
Stellar Luminosity (Lsun)2,039.91
Associated / Clustered StarsGamma2 Normae

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)47.58
Effective Temperature5,467 Kelvin

Sources and Links

SIMBAD SourceLink

Location of Gamma1 Normae in Norma

Gamma1 Normae Location in Norma

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

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