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V335 Hydrae, HD106198, HIP59588

V335 Hydrae is a red eruptive luminous giant star that can be located in the constellation of Hydra. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP59588 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD106198. The Id of the star in the Gould Star Catalogue is 316. 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.

V335 Hydrae has alternative name(s), V335 Hya.

Location of V335 Hydrae

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 V335 Hydrae, the location is 12h 13m 12.97 and -34d 07` 31.0 .

Proper Motion of V335 Hydrae

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 5.89 ± 0.20 miliarcseconds/year towards the north and -36.19 ± 0.46 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V335 Hydrae

V335 Hydrae has a spectral type of M4/M5Ib/II:. This means the star is a red luminous giant star. The star is 7283.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23754.4763435200000000s. The star has a B-V Colour Index of 1.44 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,134 Kelvin.

V335 Hydrae Radius has been calculated as being 27.43 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,083,394.28.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 35.17. 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 -0.25 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

V335 Hydrae Apparent and Absolute Magnitudes

V335 Hydrae has an apparent magnitude of 6.34 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 -0.89 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.43. 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 V335 Hydrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.58 which gave the calculated distance to V335 Hydrae as 911.07 light years away from Earth or 279.33 parsecs. It would take a spaceship travelling at the speed of light, 911.07 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 2.79 which put V335 Hydrae at a distance of 1169.04 light years or 358.42 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 7,283.00 Parsecs or 23,754.48 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 V335 Hydrae

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. V335 Hydrae brightness ranges from a magnitude of 6.345 to a magnitude of 5.841 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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.

V335 Hydrae Facts

Alternative Names

Traditional/Proper NameV335 Hydrae
Short NameV335 Hya
Hipparcos Library I.D.59588
Gould I.D.316
Henry Draper Designation106198

Visual Facts

Star Typeluminous giant star
Absolute Magnitude-0.89 / -1.43
Visual / Apparent Magnitude6.34
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)12h 13m 12.97
Declination (Dec.)-34d 07` 31.0
Galactic Latitude28.08 degrees
Galactic Longitude293.97 degrees
1997 Distance from Earth3.58 Parallax (milliarcseconds)
 911.07 Light Years
 279.33 Parsecs
2007 Revised Distance from Earth2.79 Parallax (milliarcseconds)
 1169.04 Light Years
 358.42 Parsecs
Galacto-Centric Distance23,754.48 Light Years / 7,283.00 Parsecs
Proper Motion Dec.5.89 ± 0.20 milliarcseconds/year
Proper Motion RA.-36.19 ± 0.46 milliarcseconds/year
B-V Index1.44
Radial Velocity2.80 ± 0.50 km/s
Iron Abundance-0.25 ± 9.99 Fe/H
Spectral TypeM4/M5Ib/II:
Colour(M) Red

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.470
Variable Magnitude Range (Brighter - Dimmer)5.841 - 6.345

Estimated Facts

Calculated Effective Temperature4,134 Kelvin

Sources and Links

SIMBAD SourceLink

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