HR 3153 is a red pulsating star that can be located in the constellation of Carina. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
HIP39070 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD66342.
HR 3153 has alternative name(s), V460 Car.
The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For HR 3153, the location is 07h 59m 37.55 and -60d 35` 13.5 .
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 11.90 ± 0.18 miliarcseconds/year towards the north and -3.56 ± 0.20 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 22.57000 km/s with an error of about 0.16 km/s .
HR 3153 has a spectral type of M0II. This means the star is a red star. The star is 7385.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24087.1629544000000000s. The star has a B-V Colour Index of 1.75 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,255 Kelvin.
HR 3153 Radius has been calculated as being 86.26 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 60,021,772.64.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 80.88. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.
HR 3153 has an apparent magnitude of 5.19 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 -2.34 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.20. 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.12 which gave the calculated distance to HR 3153 as 1045.40 light years away from Earth or 320.51 parsecs. It would take a spaceship travelling at the speed of light, 1045.40 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
In 2007, Hipparcos data was revised with a new parallax of 3.32 which put HR 3153 at a distance of 982.42 light years or 301.20 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.
The star's Galacto-Centric Distance is 7,385.00 Parsecs or 24,087.16 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.
The star is a pulsating Slow Irregular 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. HR 3153 brightness ranges from a magnitude of 5.306 to a magnitude of 5.206 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).
|Traditional/Proper Name||HR 3153|
|Short Name||V460 Car|
|Hipparcos Library I.D.||39070|
|Henry Draper Designation||66342|
|Absolute Magnitude||-2.34 / -2.20|
|Visual / Apparent Magnitude||5.19|
|Naked Eye Visible||Yes - Magnitudes|
|Right Ascension (R.A.)||07h 59m 37.55|
|Declination (Dec.)||-60d 35` 13.5|
|Galactic Latitude||-15.61 degrees|
|Galactic Longitude||273.76 degrees|
|1997 Distance from Earth||3.12 Parallax (milliarcseconds)|
|1045.40 Light Years|
|2007 Revised Distance from Earth||3.32 Parallax (milliarcseconds)|
|982.42 Light Years|
|Galacto-Centric Distance||24,087.16 Light Years / 7,385.00 Parsecs|
|Proper Motion Dec.||11.90 ± 0.18 milliarcseconds/year|
|Proper Motion RA.||-3.56 ± 0.20 milliarcseconds/year|
|Radial Velocity||22.57 ± 0.16 km/s|
|Variable Star Class||Pulsating|
|Variable Star Type||Slow Irregular|
|Mean Variability Period in Days||0.071|
|Variable Magnitude Range (Brighter - Dimmer)||5.206 - 5.306|
|Calculated Effective Temperature||3,255 Kelvin|