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HR 3600, HD77475, HIP44299

HR 3600 is a blue main sequence dwarf star that can be located in the constellation of Vela. 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.

HR 3600's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR3600. HIP44299 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD77475.

HR 3600 has alternative name(s) :- , IZ Vel.

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

Location of HR 3600

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 HR 3600, the location is 09h 01m 20.88 and -41° 51` 51.4 .

Proper Motion of HR 3600

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 15.19 ± 0.35 miliarcseconds/year towards the north and -18.30 ± 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 22.80000 km/s with an error of about 1.20 km/s .

HR 3600 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 205.08 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) of HR 3600

HR 3600 has a spectral type of B5V. This means the star is a blue main sequence dwarf star. The star is 7,415.00 Parsecs from the Galactic Centre or terms of Light Years is 24,185.01 s. The star has a B-V Colour Index of -0.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,762 Kelvin.

HR 3600 Radius has been calculated as being 2.13 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,484,406.02.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 1.95. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HR 3600 Apparent and Absolute Magnitudes

HR 3600 has an apparent magnitude of 5.56 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 -0.24 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.04. 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 HR 3600

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.92 which gave the calculated distance to HR 3600 as 471.33 light years away from Earth or 144.51 parsecs. It would take a spaceship travelling at the speed of light, 471.33 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 7.60 which put HR 3600 at a distance of 429.16 light years or 131.58 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*. HR 3600 brightness ranges from a magnitude of 5.529 to a magnitude of 5.493 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

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HR 3600 Facts

Visual Facts


Primary / Proper / Traditional NameHR 3600
Alternative NamesHD 77475, HIP 44299, HR 3600, IZ Vel
Spectral TypeB5V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationVela
Absolute Magnitude-0.24 / -0.04
Visual / Apparent Magnitude5.56
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)09h 01m 20.88
Declination (Dec.)-41° 51` 51.4
Galactic Latitude2.96 degrees
Galactic Longitude263.95 degrees
1997 Distance from Earth6.92 Parallax (milliarcseconds)
 471.33 Light Years
 144.51 Parsecs
2007 Distance from Earth7.60 Parallax (milliarcseconds)
 429.16 Light Years
 131.58 Parsecs
Galacto-Centric Distance24,185.01 Light Years / 7,415.00 Parsecs
Proper Motion Dec.15.19 ± 0.35 milliarcseconds/year
Proper Motion RA.-18.30 ± 0.45 milliarcseconds/year
B-V Index-0.13
Radial Velocity22.80 ± 1.20 km/s
Eccentricity0.06
Semi-Major Axis6988.00
Stellar Luminosity (Lsun)205.08

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.025
Variable Magnitude Range (Brighter - Dimmer)5.493 - 5.529

Estimated Facts


Calculated Effective Temperature12,762 Kelvin

Sources and Links


SIMBAD SourceLink

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