Within our galaxy, the Milky Way, countless of ours nearest stars are quickly visible through the naked eye. It is possible to identify countless of the brightest Stars by their place or the shapes and patterns they make as component of a constellation or asterism. One together star which is fairly easy come recognise and also the emphasis of this post, is Tarf (β Cancri)

What is a Star?

A star is an expensive object, prefer a substantial ball, that is composed of hydrogen and also helium, with sufficient mass to permit it come sustain nuclear fusion at that is core. The best-known star is the Sun, i beg your pardon is the only star in our solar system. The Star we are pertained to with because that this write-up is Tarf (β Cancri).

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The luminosity the the sun is measured together 1 on the traditional luminosity scale and anything larger than 1 signifies the Star emits much more energy 보다 the Sun. Usually the more luminous a star is, the an ext energy the produces.

Tarf (β Cancri), is cooler and also emits less power than ours Sun, yet it is still quickly recognizable as the brightest star in the constellation of Cancer.

Characteristics of a Star

There room 5 main qualities that define a star:

Brightness – luminosity and magnitudeMass – utilizing the sunlight as the benchmarkSize – using the sunlight as a benchmarkColor – depends on the temperature that the starSurface temperature – measure on the Kelvin scale


The brightness that a star is identified by 2 factors: Luminosity and Magnitude:

Luminosity – is the amount of light the a star radiates as determined by its surface ar temperature and its sizeMagnitude – the size star variable measures the brightness of the star in 2 ways, by its ‘apparent magnitude’ and its ‘absolute magnitude’.Apparent magnitude

The brightness measure, once both the distance and the size of the star are taken right into consideration, is represented by the term ‘Apparent Magnitude’.

Absolute magnitude

Whereas, when the true brightness the a star is measured, regardless of whether of its distance from Earth, it is stood for by the hatchet ‘Absolute Magnitude’.


The mass of a star is measured versus the massive of the Sun, where the sun is measured as 1, and also said to same 1 solar mass.

FACT: Solar massive is a conventional unit of massive in astronomy, equal to around 2×10 (to the power of 30) kg. That is used as a measure up for stars, nebulae, black holes and other solar masses the material.

A star the is two and a fifty percent times bigger 보다 the fixed of the sun would be measured as having actually a fixed of 2.5 solar masses.

The measure of mass also takes density into consideration.


Our Sun, and also the earth of Jupiter are often used as a benchmark because that measuring many objects, prefer Stars, in the Solar System.

The dimension of a star is normally compared with the size of our Sun, so if a star was twice the dimension of our sun it would be measured together 2 solar radii, and if it to be the very same size together the sunlight it would be measured as 1 solar radii.

Stars the are comparable in dimension may have actually a different mass measure as thickness has to it is in factored right into the measurement of mass.


The basic spectrum of color measure for stars is identified by surface ar temperature.

From a young period we combine temperature with colors. The yellow sun is hot and the deep blue water is cold.

However opposing of what us are caused believe about this relationship between color and temperature applies with stars. We normally associate blue together an icy cold color and also red as a hot color.

However through stars, the hot stars have a cooler color and the cooler stars have a warmer color.

This method that a blue supergiant star would certainly be hotter 보다 a red supergiant star, through blue-white, white, yellow and also red-orange stars, what in between.

Surface temperature

The temperature that a star is measured on a scale known as the ‘Kelvin scale’.

On the Kelvin scale, zero degrees is theoretically absolute and equivalent come -273.15 degrees Celsius.

The approximate temperatures of stars by color selection from:

Hot Stars (Blue) – 50,000 KTarf, Cancri b, (Orange to red) – 3,990KThe sun – 5,500 KCooler Stars (Red)- 2,500K

So let’s take it a look at among the cooler and mature resolved Stars in our night sky.

The Arabic called Star Al Tarf (Beta Cancri, 17 Cancri)


The celestial pole defines the poles the the celestial equatorial name: coordinates system.

An object at the Celestial pole has a declination of 0 degrees.

The declinations because that the phibìc celestial pole is +90 degreesThe declinations because that the southern celestial pole is -90 degrees

The celestial poles room not permanently in a addressed position against the lift of the stars as everything moves in Space.

The Tarf Star is situated in the southerly celestial skies at a +09, 11’ degrees declination, and an median 08 hours, 16 min right ascension.

Fun Facts about Stars – go you recognize that?

There are roughly 6,000 stars clearly shows by the nude eye native EarthCancer is just one of the faintest of the 12 Constellations of the zodiacTarf is sometimes referred to together HD 69267It is noted as i know well 40526 in the Hipparcos Star CatalogueTarf’s star type is well-known as a ‘High proper-motion Star’Another star designation because that Altarf is SAO 116569After the Sun, Sirius is the brightest star in the sky with an obvious magnitude the -1.46The Star we contact The sun does not belong to any kind of constellationThe planet Jupiter is regularly cited when making dimension comparisons in between planets or stars. The Jupiter fixed is a unit that mass equal to the total mass of earth JupiterThe center of a Galaxy does not contain a giant Star it has a Supermassive black Hole.A Red Dwarf is not a Dwarf earth it is a Star. Most usual Stars room Red Dwarf (cool Stars favor Tarf)

Commonly asked Questions

Q. What avoids us seeing the Stars in the night sky?

A. irradiate pollution, fog, city lights and also artificial lights all border our visibility that the objects in the skies at night.

Q. Will the locations of Stars readjust over time?

A. Stars room continually top top the move.

The photos we kind in our imagination to make objects, shapes and also patterns the end of the constellations have already shifted over time.

See more: What Is 19 Cm In Inches ? Convert 19 Centimeters To Inches

As we watch the night skies from earth they are likely to continue to change and possibly over time the pictures may look an extremely different.


Tarf photo – https://theskylive.com/sky/stars/tarf-beta-cancri-starNebula – by Credit: NASA, Jeff Hester, and also Paul Scowen (Arizona State University) – http://hubblesite.org/newscenter/newsdesk/archive/releases/2003/34/image/a, public Domain, https://commons.wikimedia.org/w/index.php?curid=129538Supernova Remnant – Cassiopeia A. Credit: NASA/CXC/SAO – https://scitechdaily.com/lonely-origin-of-cassiopeia-a-revealed-one-of-the-most-famous-supernova-remnantsMilky method – Source: Nick Risinger – https://sedsvit.medium.com/just-us-d4ab577099a2Celestial Pole – through I, Dennis Nilsson, CC through 3.0, https://commons.wikimedia.org/w/index.php?curid=3262268Tarf shade – https://vignette.wikia.nocookie.net/startrek/images/a/a4/Beta_Lankal_primary.jpg/revision/latest/top-crop/width/360/height/450?cb=20140118211513Johann Bayer – https://laexuberanciadehades.files.wordpress.com/2012/10/johann-bayer.jpg