Universe Guide

AA Pictoris

AA Pictoris Facts

  • AA Pictoris is a giant star that can be located in the constellation of Pictor. The description is based on the spectral class.
  • AA Pictoris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M1/M2III) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 2203.81 light years away from us. Distance

AA Pictoris's Alternative Names

HIP28217 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD40664.

AA Pictoris has alternative name(s) :- , AA Pic.

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

Location of AA Pictoris

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 AA Pictoris, the location is 05h 57m 42.67 and -48° 15` 23.5 .

Proper Motion of AA Pictoris

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 4.11 ± 0.50 milliarcseconds/year towards the north and -6.47 ± 0.62 milliarcseconds/year east if we saw them in the horizon. . 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 AA Pictoris

AA Pictoris Temperature and Colour

Based on the star's spectral type of M1/M2III , AA Pictoris's colour and type is red giant star. The star has a B-V Colour Index of 1.65 which means the star's temperature is about 3,640 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AA Pictoris Radius

AA Pictoris estimated radius has been calculated as being 76.34 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 53,114,145.12.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 37.73208034793750508422551232. 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.

AA Pictoris Apparent and Absolute Magnitudes

AA Pictoris has an apparent magnitude of 8.12 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 -2.56 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.03. 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 AA Pictoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.73000 which gave the calculated distance to AA Pictoris as 4467.99 light years away from Earth or 1369.86 parsecs. If you want that in miles, it is about 26,265,639,381,130,637.64, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.48000 which put AA Pictoris at a distance of 2203.81 light years or 675.68 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 139,368,033.16 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 AA Pictoris

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 A3807362,008,032,110.27
Speed of Sound (Mach 1)767.2691,926,197,504.60
Concorde (Mach 2)1,534.54963,097,497.07
New Horizons Probe33,00044,785,201.00
Speed of Light670,616,629.002,203.81
AA Pictoris brightness ranges from a magnitude of 8.261 to a magnitude of 8.149 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 AA Pictoris Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAA Pictoris
Alternative NamesHD 40664, HIP 28217, AA Pic
Spectral TypeM1/M2III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude -2.56 / -1.03
Visual / Apparent Magnitude8.12
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 57m 42.67
Declination (Dec.)-48° 15` 23.5
Galactic Latitude-28.54612292 degrees
Galactic Longitude255.43802271 degrees
1997 Distance from Earth0.73000 Parallax (milliarcseconds)
 4467.99 Light Years
 1369.86 Parsecs
2007 Distance from Earth1.48000 Parallax (milliarcseconds)
 2203.81 Light Years
 675.68 Parsecs
 139,368,033.16 Astronomical Units
Proper Motion Dec.4.11000 ± 0.50000 milliarcseconds/year
Proper Motion RA.-6.47000 ± 0.62000 milliarcseconds/year
B-V Index1.65

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.101
Variable Magnitude Range (Brighter - Dimmer)8.149 - 8.261

Estimated Calculated Facts

Radius (x the Sun)37.73
Effective Temperature3,640 Kelvin

Sources and Links

SIMBAD SourceLink

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Comments and Questions

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