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Ahadi (Pi Puppis) Star Facts

Ahadi Facts

Ahadi's Alternative Names

Pi Puppis (Pi. 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 HR2773. HIP35264 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD56855.

Ahadi has alternative name(s) :- , pi. 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 82 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 Ahadi

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 Ahadi, the location is 07h 17m 08.56 and -37° 05` 51.0 .

Radial Velocity and Proper Motion of Ahadi

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 6.47 ± 0.28 milliarcseconds/year towards the north and -10.05 ± 0.33 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 15.80 km/s with an error of about 0.60 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.

Physical Properties (Colour, Temperature) of Ahadi

Ahadi Colour and Temperature

Ahadi has a spectral type of K3Ib. This means the star is a orange to red supergiant star. The star has a B-V Colour Index of 1.61 which means the star's temperature is about 3,747 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

Ahadi Radius

Radius has been calculated as being 213.59 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 148,617,087.59.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 157.61. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Ahadi Apparent and Absolute Magnitudes

Ahadi has an apparent magnitude of 2.71 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 -4.92 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.26. 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 Ahadi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.98 which gave the calculated distance to Ahadi as 1094.51 light years away from Earth or 335.57 parsecs. If you want that in miles, it is 733,996,606,607.

In 2007, Hipparcos data was revised with a new parallax of 4.04 which put Ahadi at a distance of 807.34 light years or 247.52 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 51,054,309.09 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 7,490.00 Parsecs or 24,429.63 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 Ahadi

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)
Walking4135,353,907,314.22
Car1204,511,796,910.47
Airbus A380736735,619,061.49
Speed of Sound (Mach 1)767.269705,639,911.50
Concorde (Mach 2)1,534.54352,819,495.91
New Horizons Probe33,00016,406,534.22
Speed of Light670,616,629.00807.34

Variable Type of Ahadi

The star is a pulsating Semi-Regular Star w variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. Ahadi brightness ranges from a magnitude of 2.865 to a magnitude of 2.804 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

Meteor Showers Radiating from near Ahadi

The Pi Puppids Meteor Shower radiants from a point near this star. The meteor shower runs typically between Apr 15 - Apr 28 with a peak date of Apr 23. The speed of a meteor in the shower is 15 Km/s. The amount of meteors predicted to be seen per hour (Zenith Hourly Rate) is 15.

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 Ahadi Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAhadi
Alternative NamesPi Puppis, Pi. Pup, HD 56855, HIP 35264, HR 2773, 82 G. Puppis, pi. Pup
Spectral TypeK3Ib
Constellation's Main StarYes
Multiple Star SystemYes
Star Type very luminous Supergiant Star less luminour Supergiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationPuppis
Absolute Magnitude -4.92 / -4.26
Visual / Apparent Magnitude2.71
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 17m 08.56
Declination (Dec.)-37° 05` 51.0
Galactic Latitude-11.28 degrees
Galactic Longitude249.01 degrees
1997 Distance from Earth2.98 Parallax (milliarcseconds)
 1094.51 Light Years
 335.57 Parsecs
2007 Distance from Earth4.04 Parallax (milliarcseconds)
 807.34 Light Years
 247.52 Parsecs
 51,054,309.09 Astronomical Units
Galacto-Centric Distance24,429.63 Light Years / 7,490.00 Parsecs
Proper Motion Dec.6.47 ± 0.28 milliarcseconds/year
Proper Motion RA.-10.05 ± 0.33 milliarcseconds/year
B-V Index1.61
Radial Velocity15.80 ± 0.60 km/s
Eccentricity0.07
Semi-Major Axis8006.00

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.052
Variable Magnitude Range (Brighter - Dimmer)2.804 - 2.865

Estimated Calculated Facts


Radius (x the Sun)157.61
Effective Temperature3,747 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
56855-36 3489.2A2.70000-12.000004.00000K5Orange
56856-36 3487.2B8.00000-31.00000-4.00000B9Blue/White1826

Puppis Main Stars


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