Universe Guide


Y Pavonis - HD203133 - HIP105678

Y Pavonis is a pulsating luminous giant star that can be located in the constellation of Pavo. HIP105678 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD203133. Y Pavonis has alternative name(s), Y_Pav.

Location of Y Pavonis


Proper Motion of Y Pavonis

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 -007.62 ± 000.39 towards the north and 009.46 ± 000.59 east if we saw them in the horizon.

Physical Properties (Temperature, Radius) of Y Pavonis

Y Pavonis has a spectral type of C5II. This means the star is a luminous giant star. The star has a B-V Colour Index of 2.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 2 Kelvin.

Y Pavonis has been calculated as 156,624,009.36 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 108,978,985,715,818.66.km.

Y Pavonis Apparent and Absolute Magnitudes

Y Pavonis 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 -1.52 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.75. 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 Y Pavonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.76 which gave the calculated distance to Y Pavonis as 1181.75 light years away from Earth or 362.32 parsecs. It would take a spaceship travelling at the speed of light, 1181.75 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 2.48 which put Y Pavonis at a distance of 1315.17 light years or 403.23 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 Y Pavonis

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. Y Pavonis brightness ranges from a magnitude of 7.000 to a magnitude of 6.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.0 days (variability).

Source of Information


Y Pavonis Facts

Alternative Names

Traditional NameY Pavonis
Short NameY Pav
Hipparcos Library I.D.105678
Henry Draper Designation203133

Visual Facts

Star Typeluminous giant star
Absolute Magnitude-1.52 / -1.75
Apparent Magnitude6.28
Right Ascension (R.A.)21h 24m 16.73
Declination (Dec.)-69d44`01.9
1997 Distance from Earth2.76 Parallax (milliarcseconds)
 1181.75 Light Years
 362.32 Parsecs
2007 Revised Distance from Earth2.48 Parallax (milliarcseconds)
 1315.17 Light Years
 403.23 Parsecs
Proper Motion Dec.-7.62 ± 0.39 milliarcseconds/year
Proper Motion RA.9.46 ± 0.59 milliarcseconds/year
B-V Index2.60
Spectral TypeC5II

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 Days1.000
Variable Magnitude Range (Brighter - Dimmer)6.000 - 7.000

Estimated Facts

Radius (x the Sun)156,624,009.36
Calculated Effective Temperature2 Kelvin

Sources and Links

SIMBAD SourceLink

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