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Hadir (Sigma Puppis) Star Facts

Hadir Facts

Hadir's Alternative Names

Sigma Puppis (Sig Pup) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR2878. HIP36377 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD59717.

Hadir has alternative name(s) :- , sig Pup.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 99 G. Puppis. There are no stars with a Gould designation in Ursa Major for example.

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

Location of Hadir

The location of the giant 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 Hadir, the location is 07h 29m 13.88 and -43° 18` 06.8 .

Radial Velocity and Proper Motion of Hadir

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 188.31 ± 0.40 milliarcseconds/year towards the north and -59.55 ± 0.48 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 87.30 km/s with an error of about 0.74 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.

Hadir 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 392.04 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 Hadir

Hadir Colour and Temperature

Hadir has a spectral type of K5III SB. This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.5 which means the star's temperature is about 3,989 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

Hadir Radius

Radius has been calculated as being 24.73 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 17,205,399.63.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 26.01. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Hadir Apparent and Absolute Magnitudes

Hadir has an apparent magnitude of 3.25 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 -0.51 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.62. 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 Hadir

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 17.74 which gave the calculated distance to Hadir as 183.86 light years away from Earth or 56.37 parsecs. If you want that in miles, it is 123,299,573,408.

In 2007, Hipparcos data was revised with a new parallax of 16.84 which put Hadir at a distance of 193.68 light years or 59.38 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 12,247,918.85 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 7,414.00 Parsecs or 24,181.75 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to Hadir

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking432,471,257,176.18
Car1201,082,375,239.21
Airbus A380736176,474,223.78
Speed of Sound (Mach 1)767.269169,282,257.86
Concorde (Mach 2)1,534.5484,641,018.61
New Horizons Probe33,0003,935,909.96
Speed of Light670,616,629.00193.68
Hadir brightness ranges from a magnitude of 3.385 to a magnitude of 3.359 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 130.5 days (variability).

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 Hadir Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHadir
Alternative NamesSigma Puppis, Sig Pup, HD 59717, HIP 36377, HR 2878, 99 G. Puppis, sig Pup
Spectral TypeK5III SB
Constellation's Main StarYes
Multiple Star SystemYes
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
Constellation Puppis
Absolute Magnitude -0.51 / -0.62
Visual / Apparent Magnitude3.25
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 29m 13.88
Declination (Dec.)-43° 18` 06.8
Galactic Latitude-11.91 degrees
Galactic Longitude255.74 degrees
1997 Distance from Earth17.74 Parallax (milliarcseconds)
 183.86 Light Years
 56.37 Parsecs
2007 Distance from Earth16.84 Parallax (milliarcseconds)
 193.68 Light Years
 59.38 Parsecs
 12,247,918.85 Astronomical Units
Galacto-Centric Distance24,181.75 Light Years / 7,414.00 Parsecs
Proper Motion Dec.188.31 ± 0.40 milliarcseconds/year
Proper Motion RA.-59.55 ± 0.48 milliarcseconds/year
B-V Index1.50
Radial Velocity87.30 ± 0.74 km/s
Eccentricity0.50
Inclination68.06
Semi-Major Axis4604.00
Stellar Luminosity (Lsun)392.04
Orbital Period (Days)257.80
Argument Of Periastron349.30

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days130.500
Variable Magnitude Range (Brighter - Dimmer)3.359 - 3.385

Estimated Calculated Facts


Radius (x the Sun)26.01
Effective Temperature3,989 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
59717-43 3260.2A3.30000-77.00000187.00000M0Red
B9.40000-81.00000189.00000G5Yellow1952

Location of Hadir in Puppis


Hadir Location in Puppis

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

Puppis Main Stars


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