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BT Sculptoris

BT Sculptoris Facts

  • BT Sculptoris is a giant star that can be located in the constellation of Sculptor. The description is based on the spectral class.
  • BT Sculptoris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2III) 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 -8363.16 light years away from us. Distance

BT Sculptoris's Alternative Names

HIP116105 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD221341.

BT Sculptoris has alternative name(s) :- , BT Scl.

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

Location of BT Sculptoris

The location of the giant 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 BT Sculptoris, the location is 23h 31m 31.07 and -28° 56` 37.2 .

Physical Properties of BT Sculptoris

BT Sculptoris Colour and Temperature

Based on the star's spectral type of M2III , BT Sculptoris's colour and type is red giant star. The star has a B-V Colour Index of 1.58 which means the star's temperature is about 3,827 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BT Sculptoris Apparent and Absolute Magnitudes

BT Sculptoris has an apparent magnitude of 8.88 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 BT Sculptoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.39000 which gave the calculated distance to BT Sculptoris as -8363.16 light years away from Earth or -2564.10 parsecs. If you want that in miles, it is about -49,163,884,575,994,239.81, based on 1 Ly = 5,878,625,373,183.61 miles.

BT Sculptoris brightness ranges from a magnitude of 8.978 to a magnitude of 8.867 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 BT Sculptoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBT Sculptoris
Alternative NamesHD 221341, HIP 116105, BT Scl
Spectral TypeM2III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationSculptor
Visual / Apparent Magnitude8.88
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)23h 31m 31.07
Declination (Dec.)-28° 56` 37.2
Galactic Latitude-72.29256367 degrees
Galactic Longitude22.38047650 degrees
Distance from Earth-0.39000 Parallax (milliarcseconds)
 -8363.16 Light Years
 -2564.10 Parsecs
 -528,879,904.41 Astronomical Units
B-V Index1.58

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.084
Variable Magnitude Range (Brighter - Dimmer)8.867 - 8.978

Estimated Calculated Facts


Effective Temperature3,827 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
221341-2918729.2A9.6000022.00000-27.00000K5Orange
B9.900001932

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