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Eta1 Pictoris, HD32743, HIP23482, HR1649

Eta1 Pictoris is a blue to white main sequence dwarf star that can be located in the constellation of Pictor. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 1.40 Billion of Years but could be as young as 0.90 to 1.80 according to Hipparcos.

Eta1 Pictoris's Alternative Names

Eta1 Pictoris (Eta01 Pic) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR1649. HIP23482 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32743. The Gliese ID of the star is GL 187. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

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

Location of Eta1 Pictoris

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For Eta1 Pictoris, the location is 05h 02m 48.73 and -49° 09` 05.3 .

Proper Motion of Eta1 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 27.37 ± 0.17 miliarcseconds/year towards the north and -43.67 ± 0.18 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 21.40000 km/s with an error of about 2.80 km/s .

Eta1 Pictoris 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 4.08 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, Age) of Eta1 Pictoris

Eta1 Pictoris has a spectral type of F2V. This means the star is a blue to white main sequence dwarf star. The star is 7,405.00 Parsecs from the Galactic Centre or terms of Light Years is 24,152.40 s. The star has a B-V Colour Index of 0.42 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,635 Kelvin.

Eta1 Pictoris Radius has been calculated as being 1.56 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,085,609.85.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 1.55. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.15 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.40 Billion years old but could be between 0.90 and 1.80 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Eta1 Pictoris Apparent and Absolute Magnitudes

Eta1 Pictoris has an apparent magnitude of 5.37 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 3.28 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.29. 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 Eta1 Pictoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 38.19 which gave the calculated distance to Eta1 Pictoris as 85.41 light years away from Earth or 26.18 parsecs. It would take a spaceship travelling at the speed of light, 85.41 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 38.35 which put Eta1 Pictoris at a distance of 85.05 light years or 26.08 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.

The star's Galacto-Centric Distance is 7,405.00 Parsecs or 24,152.40 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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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Eta1 Pictoris Facts

Visual Facts


Primary / Proper / Traditional NameEta1 Pictoris
Alternative NamesEta01 Pic, HD 32743, HIP 23482, HR 1649, Gliese 187
Spectral TypeF2V
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour blue to white
GalaxyMilky Way
ConstellationPictor
Age1.40 Billion Years Old
Age Range0.90 - 1.80 Billion Years Old
Absolute Magnitude3.28 / 3.29
Visual / Apparent Magnitude5.37
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 02m 48.73
Declination (Dec.)-49° 09` 05.3
Galactic Latitude-37.63 degrees
Galactic Longitude255.64 degrees
1997 Distance from Earth38.19 Parallax (milliarcseconds)
 85.41 Light Years
 26.18 Parsecs
2007 Distance from Earth38.35 Parallax (milliarcseconds)
 85.05 Light Years
 26.08 Parsecs
Galacto-Centric Distance24,152.40 Light Years / 7,405.00 Parsecs
Proper Motion Dec.27.37 ± 0.17 milliarcseconds/year
Proper Motion RA.-43.67 ± 0.18 milliarcseconds/year
B-V Index0.42
Radial Velocity21.40 ± 2.80 km/s
Iron Abundance0.15 ± 0.04 Fe/H
Eccentricity0.04
Semi-Major Axis7593.00
Stellar Luminosity (Lsun)4.08

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature6,635 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
32743-49 1541.2A5.40000-48.0000028.00000F5Yellow/White
B13.000001946

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