The location of the supergiant 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 Melnick 42, the location is 05h 38m 42.12 and -69° 05` 55.19 .
Melnick 42 has a spectral type of O2If* C. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.08 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,721 Kelvin.
Melnick 42 Radius has been calculated as being 0.57 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 394,650.94.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.
Melnick 42 has an apparent magnitude of 12.78 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 4.29 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.
The Parallax of the star is given as 2.00 which gives a calculated distance to Melnick 42 of 1630.00 light years from the Earth or 499.75 parsecs. It would take a spaceship travelling at the speed of light, 1630.00 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is roughly 103,080,118.65 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.
|Primary / Proper / Traditional Name||Melnick 42|
|Spectral Type||O2If* C|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||very luminous Supergiant Star|
|Galaxy||Tarantula Nebula (NGC2070)|
|Visual / Apparent Magnitude||12.78|
|Naked Eye Visible||Requires a 4.5 - 6 Inch Telescope - Magnitudes|
|Right Ascension (R.A.)||05h 38m 42.12|
|Declination (Dec.)||-69° 05` 55.19|
|Distance from Earth||2.00 Parallax (milliarcseconds)|
|1630.00 Light Years|
|103,080,118.65 Astronomical Units|
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