Ross 248 has alternative name(s) :- HH Andromedae, HH And.
More details on objects' alternative names can be found at Star Names .
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 Ross 248, the location is 23h 41m 54.99 and +44° 10` 40.8 .
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 -1,592.77 milliarcseconds/year towards the north and 115.10 milliarcseconds/year east if we saw them in the horizon.
The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -77.18 km/s . 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.
Ross 248 has a spectral type of M5.0V. This means the star is a red main sequence star. The star has a B-V Colour Index of 1.92 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 1,964 Kelvin.
Radius has been calculated as being 0.09 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 61,795.90.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.
Ross 248 has an apparent magnitude of 12.29 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 14.79 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 316.72 which gives a calculated distance to Ross 248 of 10.30 light years from the Earth or 3.16 parsecs. It would take a spaceship travelling at the speed of light, 10.30 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is roughly 651,792.25 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||Ross 248|
|Alternative Names||HH Andromedae, HH And|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Main Sequence Dwarf Star|
|Visual / Apparent Magnitude||12.29|
|Naked Eye Visible||Requires a 4.5 - 6 Inch Telescope - Magnitudes|
|Right Ascension (R.A.)||23h 41m 54.99|
|Declination (Dec.)||+44° 10` 40.8|
|Distance from Earth||316.72 Parallax (milliarcseconds)|
|10.30 Light Years|
|651,792.25 Astronomical Units|
|Proper Motion Dec.||-1592.77 milliarcseconds/year|
|Proper Motion RA.||115.10 milliarcseconds/year|
|Radial Velocity||-77.18 km/s|
|Radius (x the Sun)||0.09|
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