Universe Guide

AI Phoenicis

AI Phoenicis Facts

  • AI Phoenicis is a eclipsing main sequence star that can be located in the constellation of Phoenix. The description is based on the spectral class.
  • AI Phoenicis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G3V) of the star, the star's colour is yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star has an estimated age of 13.50 Billion of Years but could be as young as 11.00 to 16.30 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 931.90 light years away from us. Distance

AI Phoenicis's Alternative Names

HIP5438 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD6980.

AI Phoenicis has alternative name(s) :- AI Phe, AI Phe.

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

Location of AI Phoenicis

The location of the main sequence 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 AI Phoenicis, the location is 01h 09m 34.15 and -46° 15` 56.1 .

Radial Velocity and Proper Motion of AI Phoenicis

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 -0.69 ± 0.67 milliarcseconds/year towards the north and 55.91 ± 1.04 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 -1.84000 km/s with an error of about 0.06 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 of AI Phoenicis

AI Phoenicis Colour and Temperature

Based on the star's spectral type of G3V , AI Phoenicis's colour and type is yellow main sequence star. The star has a B-V Colour Index of 0.6 which means the star's temperature is about 5,895 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AI Phoenicis Radius

AI Phoenicis estimated radius has been calculated as being 4.36 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,036,721.02.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 4.8744186615658538496309035909. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

AI Phoenicis Iron Abundance

AI Phoenicis Iron Abundance is -0.07 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

AI Phoenicis Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 13.50 Billion years old but could be between 11.00 and 16.30 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old. The reported age is older than the widely recognised age of the Universe so a little scepticism about the age is warranted.

AI Phoenicis Apparent and Absolute Magnitudes

AI Phoenicis has an apparent magnitude of 8.60 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 1.56 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.32. 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 AI Phoenicis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.90000 which gave the calculated distance to AI Phoenicis as 836.32 light years away from Earth or 256.41 parsecs. If you want that in miles, it is about 4,916,411,972,100,916.72, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 3.50000 which put AI Phoenicis at a distance of 931.90 light years or 285.71 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 58,931,507.15 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.

Travel Time to AI Phoenicis

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)
Airbus A380736849,113,636.64
Speed of Sound (Mach 1)767.269814,509,170.27
Concorde (Mach 2)1,534.54407,254,054.35
New Horizons Probe33,00018,937,807.17
Speed of Light670,616,629.00931.90

Variable Type of AI Phoenicis

The star is a eclipsing Beta Persei (Algol)/ 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. AI Phoenicis brightness ranges from a magnitude of 9.000 to a magnitude of 8.706 over its variable period. The smaller the magnitude, the brighter the star.

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 AI Phoenicis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAI Phoenicis
Alternative NamesAI Phe, HD 6980, HIP 5438, AI Phe
Spectral TypeG3V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Age13.50 Billion Years Old
Age Range11.00 - 16.30 Billion Years Old
Absolute Magnitude 1.56 / 1.32
Visual / Apparent Magnitude8.60
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 09m 34.15
Declination (Dec.)-46° 15` 56.1
Galactic Latitude-70.52913873 degrees
Galactic Longitude293.49818607 degrees
1997 Distance from Earth3.90000 Parallax (milliarcseconds)
 836.32 Light Years
 256.41 Parsecs
2007 Distance from Earth3.50000 Parallax (milliarcseconds)
 931.90 Light Years
 285.71 Parsecs
 58,931,507.15 Astronomical Units
Proper Motion Dec.-0.69000 ± 0.67000 milliarcseconds/year
Proper Motion RA.55.91000 ± 1.04000 milliarcseconds/year
B-V Index0.6
Radial Velocity-1.84000 ± 0.06 km/s
Iron Abundance-0.0700 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/
Variable Magnitude Range (Brighter - Dimmer)8.706 - 9.000

Estimated Calculated Facts

Radius (x the Sun)4.87
Effective Temperature5,895 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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