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L2 Puppis, HD56096, HIP34922, HR2748

L2 Puppis is a red pulsating star that can be located in the constellation of Puppis. L2 Puppis is the brightest star in Puppis based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

The Id of the star in the Yale Bright Star Catalogue is HR2748. HIP34922 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD56096. The Id of the star in the Gould Star Catalogue is 73. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

L2 Puppis has alternative name(s), L02 Pup. L2 Puppis has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of L2 Puppis

The location of the star in the galaxy 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 L2 Puppis, the location is 07h 13m 32.23 and -44d 38` 25.9 .

Proper Motion of L2 Puppis

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 324.99 ± 0.86 miliarcseconds/year towards the north and 106.31 ± 0.99 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 53.00000 km/s with an error of about 0.70 km/s .

Physical Properties (Colour, Temperature, Radius) of L2 Puppis

L2 Puppis has a spectral type of M5e. This means the star is a red star. The star is 7415.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24185.0119576000000000s. The star has a B-V Colour Index of 1.33 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,333 Kelvin.

L2 Puppis Radius has been calculated as being 13.16 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,158,103.42.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 13.85. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

L2 Puppis Apparent and Absolute Magnitudes

L2 Puppis has an apparent magnitude of 4.42 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 0.50 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.39. 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 L2 Puppis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.46 which gave the calculated distance to L2 Puppis as 198.16 light years away from Earth or 60.75 parsecs. It would take a spaceship travelling at the speed of light, 198.16 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 15.61 which put L2 Puppis at a distance of 208.95 light years or 64.06 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 7,415.00 Parsecs or 24,185.01 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of L2 Puppis

The star is a pulsating Semiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity 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. L2 Puppis brightness ranges from a magnitude of 4.554 to a magnitude of 3.841 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 140.0 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.

L2 Puppis Facts

Alternative Names

Traditional/Proper NameL2 Puppis
Short NameL02 Pup
Hipparcos Library I.D.34922
Yale Bright Star Catalogue (HR) Id2748
Gould I.D.73
Henry Draper Designation56096

Visual Facts

Star Type star
Absolute Magnitude0.50 / 0.39
Visual / Apparent Magnitude4.42
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)07h 13m 32.23
Declination (Dec.)-44d 38` 25.9
Galactic Latitude-15.04 degrees
Galactic Longitude255.77 degrees
1997 Distance from Earth16.46 Parallax (milliarcseconds)
 198.16 Light Years
 60.75 Parsecs
2007 Revised Distance from Earth15.61 Parallax (milliarcseconds)
 208.95 Light Years
 64.06 Parsecs
Galacto-Centric Distance24,185.01 Light Years / 7,415.00 Parsecs
Proper Motion Dec.324.99 ± 0.86 milliarcseconds/year
Proper Motion RA.106.31 ± 0.99 milliarcseconds/year
B-V Index1.33
Radial Velocity53.00 ± 0.70 km/s
Spectral TypeM5e
Colour(M) Red

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity
Mean Variability Period in Days140.000
Variable Magnitude Range (Brighter - Dimmer)3.841 - 4.554

Estimated Facts

Calculated Effective Temperature4,333 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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
56096-44 3227.2A100.00000329.00000M5Red

List of Extrasolar Planets orbiting L2 Puppis

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
L2 Pup bConfirmed11.99201622016.000

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