Universe Guide

SX Reticuli

SX Reticuli Facts

  • SX Reticuli is a pulsating giant star that can be located in the constellation of Reticulum. The description is based on the spectral class.
  • SX Reticuli is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M4/M5III) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 3507.13 light years away from us. Distance

SX Reticuli's Alternative Names

HIP19231 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD26431.

SX Reticuli has alternative name(s) :- , SX Ret.

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

Location of SX Reticuli

The location of the giant 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 object is compared to the celestial equator and is expressed in degrees. For SX Reticuli, the location is 04h 07m 19.60 and -60° 26` 50.2 .

Proper Motion of SX Reticuli

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 15.96 ± 0.76 milliarcseconds/year towards the north and -10.81 ± 0.81 milliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of SX Reticuli

SX Reticuli Temperature and Colour

Based on the star's spectral type of M4/M5III , SX Reticuli's colour and type is red giant star. The star has a B-V Colour Index of 1.7 which means the star's temperature is about 3,463 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

SX Reticuli Radius

SX Reticuli estimated radius has been calculated as being 89.95 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 62,590,634.54.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 39.628483658550611266199780718. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

SX Reticuli Apparent and Absolute Magnitudes

SX Reticuli has an apparent magnitude of 9.24 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 -2.70 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.92. 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 SX Reticuli

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.41000 which gave the calculated distance to SX Reticuli as 7955.20 light years away from Earth or 2439.02 parsecs. If you want that in miles, it is about 46,765,640,568,750,254.27, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.93000 which put SX Reticuli at a distance of 3507.13 light years or 1075.27 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.

Using the 2007 distance, the star is roughly 221,788,812.77 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to SX Reticuli

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A3807363,195,570,241.94
Speed of Sound (Mach 1)767.2693,065,339,141.90
Concorde (Mach 2)1,534.541,532,667,573.39
New Horizons Probe33,00071,270,899.94
Speed of Light670,616,629.003,507.13

Variable Type of SX Reticuli

The star is a pulsating Semiregular late- (M 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. SX Reticuli brightness ranges from a magnitude of 9.537 to a magnitude of 9.012 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.

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Additional SX Reticuli Facts and Figures

Visual Facts

Primary / Proper / Traditional NameSX Reticuli
Alternative NamesHD 26431, HIP 19231, SX Ret
Spectral TypeM4/M5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude -2.70 / -0.92
Visual / Apparent Magnitude9.24
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)04h 07m 19.60
Declination (Dec.)-60° 26` 50.2
Galactic Latitude-43.22051256 degrees
Galactic Longitude272.22832330 degrees
1997 Distance from Earth0.41000 Parallax (milliarcseconds)
 7955.20 Light Years
 2439.02 Parsecs
2007 Distance from Earth0.93000 Parallax (milliarcseconds)
 3507.13 Light Years
 1075.27 Parsecs
 221,788,812.77 Astronomical Units
Proper Motion Dec.15.96000 ± 0.76000 milliarcseconds/year
Proper Motion RA.-10.81000 ± 0.81000 milliarcseconds/year
B-V Index1.7

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M
Mean Variability Period in Days0.504
Variable Magnitude Range (Brighter - Dimmer)9.012 - 9.537

Estimated Calculated Facts

Radius (x the Sun)39.63
Effective Temperature3,463 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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