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RT Crateris

RT Crateris Facts

  • RT Crateris is a pulsating variable star that can be located in the constellation of Crater. The description is based on the spectral class.
  • RT Crateris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M8) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -2051.34 light years away from us. Distance

RT Crateris's Alternative Names

HIP53915 is the reference name for the star in the Hipparcos Star Catalogue.

RT Crateris has alternative name(s) :- RT Crt, RT Crt.

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

Location of RT Crateris

The location of the variable 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 RT Crateris, the location is 11h 01m 55.15 and -07° 39` 41.7 .

Physical Properties of RT Crateris

RT Crateris Temperature and Colour

Based on the star's spectral type of M8 , RT Crateris's colour and type is red variable star. The star has a B-V Colour Index of 1.27 which means the star's temperature is about 4,440 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

RT Crateris Radius

RT Crateris Apparent and Absolute Magnitudes

RT Crateris has an apparent magnitude of 11.35 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 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 RT Crateris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.59000 which gave the calculated distance to RT Crateris as -2051.34 light years away from Earth or -628.93 parsecs. If you want that in miles, it is about -12,059,059,373,026,466.54, based on 1 Ly = 5,878,625,373,183.61 miles.

Variable Type of RT Crateris

The star is a pulsating Omicron Ceti 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. RT Crateris brightness ranges from a magnitude of 12.500 to a magnitude of 9.507 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 183.0 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 RT Crateris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameRT Crateris
Alternative NamesRT Crt, HIP 53915, RT Crt
Spectral TypeM8
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationCrater
Visual / Apparent Magnitude11.35
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)11h 01m 55.15
Declination (Dec.)-07° 39` 41.7
Galactic Latitude46.25650898 degrees
Galactic Longitude261.69430587 degrees
Distance from Earth-1.59000 Parallax (milliarcseconds)
 -2051.34 Light Years
 -628.93 Parsecs
 -129,725,220.66 Astronomical Units
B-V Index1.27
Radial Velocity41.00000 ± 999.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days183.000
Variable Magnitude Range (Brighter - Dimmer)9.507 - 12.500

Estimated Calculated Facts


Effective Temperature4,440 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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