Universe Guide

IS Telescopii

IS Telescopii Facts

IS Telescopii's Alternative Names

HIP100414 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD193306.

IS Telescopii has alternative name(s) :- IS Tel, IS Tel.

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

Location of IS Telescopii

The location of the main sequence 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 IS Telescopii, the location is 20h 21m 42.69 and -49° 48` 55.4 .

Proper Motion of IS Telescopii

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 1.55 ± 0.79 milliarcseconds/year towards the north and 13.28 ± 1.34 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 (Colour, Temperature) of IS Telescopii

IS Telescopii Colour and Temperature

IS Telescopii has a spectral type of F5V. This means the star is a yellow to white main sequence star. The star has a B-V Colour Index of 0.59 which means the star's temperature is about 5,931 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

IS Telescopii Radius

Radius has been calculated as being 3.84 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,673,709.46.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 2.98. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

IS Telescopii Apparent and Absolute Magnitudes

IS Telescopii has an apparent magnitude of 9.73 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 1.81 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.36. 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 IS Telescopii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.61 which gave the calculated distance to IS Telescopii as 1249.67 light years away from Earth or 383.14 parsecs. If you want that in miles, it is 838,049,482,762.

In 2007, Hipparcos data was revised with a new parallax of 3.35 which put IS Telescopii at a distance of 973.62 light years or 298.51 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 61,571,678.28 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 IS Telescopii

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 A380736887,127,394.47
Speed of Sound (Mach 1)767.269850,973,729.33
Concorde (Mach 2)1,534.54425,486,310.12
New Horizons Probe33,00019,785,629.16
Speed of Light670,616,629.00973.62

Variable Type of IS Telescopii

The star is a eclipsing binary sys Beta Persei (Algol) 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. IS Telescopii brightness ranges from a magnitude of 10.500 to a magnitude of 9.845 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.2 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 IS Telescopii Facts and Figures

Visual Facts

Primary / Proper / Traditional NameIS Telescopii
Alternative NamesIS Tel, HD 193306, HIP 100414, IS Tel
Spectral TypeF5V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
Absolute Magnitude 1.81 / 2.36
Visual / Apparent Magnitude9.73
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 21m 42.69
Declination (Dec.)-49° 48` 55.4
Galactic Latitude-34.66 degrees
Galactic Longitude349.35 degrees
1997 Distance from Earth2.61 Parallax (milliarcseconds)
 1249.67 Light Years
 383.14 Parsecs
2007 Distance from Earth3.35 Parallax (milliarcseconds)
 973.62 Light Years
 298.51 Parsecs
 61,571,678.28 Astronomical Units
Proper Motion Dec.1.55 ± 0.79 milliarcseconds/year
Proper Motion RA.13.28 ± 1.34 milliarcseconds/year
B-V Index0.59

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Persei (Algol)
Mean Variability Period in Days1.153
Variable Magnitude Range (Brighter - Dimmer)9.845 - 10.500

Estimated Calculated Facts

Radius (x the Sun)2.98
Effective Temperature5,931 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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