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360 G. Hydrae, HD120690, HIP67620

360 G. Hydrae is a white to yellow main sequence dwarf star that can be located in the constellation of Hydra. 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 14.10 Billion of Years but could be as young as 8.60 to 17.00 according to Hipparcos.

360 G. Hydrae's Alternative Names

HIP67620 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD120690. The Gliese ID of the star is GL 530. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 360 G. Hydrae. There are no stars with a Gould designation in Ursa Major for example.

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

Location of 360 G. Hydrae

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 360 G. Hydrae, the location is 13h 51m 20.70 and -24° 23` 23.2 .

Proper Motion of 360 G. 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 -246.00 ± 0.28 miliarcseconds/year towards the north and -580.89 ± 0.45 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 -1.82000 km/s with an error of about 0.17 km/s .

360 G. Hydrae 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 1.01 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 360 G. Hydrae

360 G. Hydrae has a spectral type of G5V. This means the star is a white to yellow main sequence dwarf star. The star is 7,388.00 Parsecs from the Galactic Centre or terms of Light Years is 24,096.95 s. The star has a B-V Colour Index of 0.7 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,563 Kelvin.

360 G. Hydrae Radius has been calculated as being 1.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 722,306.15.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 1.01. 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 -0.06 with an error value of 0.02 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 14.10 Billion years old but could be between 8.60 and 17.00 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old. The reported age is older than the widely recognised age of the Universe so a little scepticism about the age is warranted.

360 G. Hydrae Apparent and Absolute Magnitudes

360 G. Hydrae has an apparent magnitude of 6.43 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 4.93 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.98. 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 360 G. Hydrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 50.20 which gave the calculated distance to 360 G. Hydrae as 64.97 light years away from Earth or 19.92 parsecs. It would take a spaceship travelling at the speed of light, 64.97 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 51.35 which put 360 G. Hydrae at a distance of 63.52 light years or 19.47 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 7,388.00 Parsecs or 24,096.95 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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360 G. Hydrae Facts

Visual Facts


Primary / Proper / Traditional Name360 G. Hydrae
Alternative NamesHD 120690, HIP 67620
Spectral TypeG5V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour white to yellow
GalaxyMilky Way
ConstellationHydra
Age14.10 Billion Years Old
Age Range8.60 - 17.00 Billion Years Old
Absolute Magnitude4.93 / 4.98
Visual / Apparent Magnitude6.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 51m 20.70
Declination (Dec.)-24° 23` 23.2
Galactic Latitude36.49 degrees
Galactic Longitude319.96 degrees
1997 Distance from Earth50.20 Parallax (milliarcseconds)
 64.97 Light Years
 19.92 Parsecs
2007 Distance from Earth51.35 Parallax (milliarcseconds)
 63.52 Light Years
 19.47 Parsecs
Galacto-Centric Distance24,096.95 Light Years / 7,388.00 Parsecs
Proper Motion Dec.-246.00 ± 0.28 milliarcseconds/year
Proper Motion RA.-580.89 ± 0.45 milliarcseconds/year
B-V Index0.70
Radial Velocity-1.82 ± 0.17 km/s
Iron Abundance-0.06 ± 0.02 Fe/H
Eccentricity0.31
Semi-Major Axis5461.00
Stellar Luminosity (Lsun)1.01

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature5,563 Kelvin

Sources and Links


SIMBAD SourceLink

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