Universe Guide


LP Aquarii, HD214983, HIP112078

LP Aquarii is a red eruptive star that can be located in the constellation of Aquarius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP112078 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD214983. The Id of the star in the Gould Star Catalogue is 172. 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.

LP Aquarii has alternative name(s), LP Aqr.

Location of LP Aquarii

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 LP Aquarii, the location is 22h 42m 05.99 and -05d06`06.6 .

Proper Motion of LP Aquarii

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 -50.90 ± 0.75 miliarcseconds/year towards the north and 70.00 ± 1.10 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of LP Aquarii

LP Aquarii has a spectral type of M0. This means the star is a red star. The star has a B-V Colour Index of 1.56 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,878 Kelvin.

LP Aquarii Radius has been calculated as being 46.96 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 32,673,051.40.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 24.19. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

LP Aquarii Apparent and Absolute Magnitudes

LP Aquarii has an apparent magnitude of 6.28 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 -1.78 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.34. 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 LP Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.44 which gave the calculated distance to LP Aquarii as 1336.74 light years away from Earth or 409.84 parsecs. It would take a spaceship travelling at the speed of light, 1336.74 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 4.74 which put LP Aquarii at a distance of 688.11 light years or 210.97 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.

Variable Type of LP Aquarii

The star is a eruptive Irregular 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. LP Aquarii brightness ranges from a magnitude of 6.642 to a magnitude of 6.299 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.4 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.

LP Aquarii Facts

Alternative Names

Traditional/Proper NameLP Aquarii
Short NameLP Aqr
Hipparcos Library I.D.112078
Bonner DurchmusterungBD-05 5843
Gould I.D.172
Henry Draper Designation214983

Visual Facts

Star Type star
Absolute Magnitude-1.78 / -0.34
Visual / Apparent Magnitude6.28
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 42m 05.99
Declination (Dec.)-05d06`06.6
Galactic Latitude-52.14 degrees
Galactic Longitude62.69 degrees
1997 Distance from Earth2.44 Parallax (milliarcseconds)
 1336.74 Light Years
 409.84 Parsecs
2007 Revised Distance from Earth4.74 Parallax (milliarcseconds)
 688.11 Light Years
 210.97 Parsecs
Proper Motion Dec.-50.90 ± 0.75 milliarcseconds/year
Proper Motion RA.70.00 ± 1.10 milliarcseconds/year
B-V Index1.56
Spectral TypeM0
Colour(M) Red

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.350
Variable Magnitude Range (Brighter - Dimmer)6.299 - 6.642

Estimated Facts

Calculated Effective Temperature3,878 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
214983-05 5843.0A7.1000068.00000-46.00000M1Red
-05 5842.0C10.30000-22.00000-18.000001890

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