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AT Andromedae

AT Andromedae Facts

AT Andromedae's Alternative Names

HIP116958 is the reference name for the star in the Hipparcos Star Catalogue.

AT Andromedae has alternative name(s) :- AT And, AT And.

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

Location of AT Andromedae

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 AT Andromedae, the location is 23h 42m 30.84 and +43° 00` 52.1 .

Physical Properties (Colour, Temperature) of AT Andromedae

AT Andromedae Colour and Temperature

AT Andromedae has a spectral type of F4. This means the star is a yellow to white variable star. The star has a B-V Colour Index of 0.44 which means the star's temperature is about 6,276 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being . The star's Iron Abundance is -1.08 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

AT Andromedae Apparent and Absolute Magnitudes

AT Andromedae has an apparent magnitude of 10.78 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 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 AT Andromedae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.70 which gave the calculated distance to AT Andromedae as -1208.01 light years away from Earth or -370.37 parsecs. If you want that in miles, it is -810,111,593,998.

Variable Type of AT Andromedae

The star is a pulsating RR Lyrae type with a 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. AT Andromedae brightness ranges from a magnitude of 11.048 to a magnitude of 10.506 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 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 AT Andromedae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAT Andromedae
Alternative NamesAT And, HIP 116958, AT And
Spectral TypeF4
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
ConstellationAndromeda
Visual / Apparent Magnitude10.78
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)23h 42m 30.84
Declination (Dec.)+43° 00` 52.1
Galactic Latitude-18.09 degrees
Galactic Longitude109.76 degrees
Distance from Earth-2.70 Parallax (milliarcseconds)
 -1208.01 Light Years
 -370.37 Parsecs
 -76,393,763.97 Astronomical Units
B-V Index0.44
Radial Velocity-234.10 ± 2.00 km/s
Iron Abundance-1.08 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with a
Mean Variability Period in Days0.617
Variable Magnitude Range (Brighter - Dimmer)10.506 - 11.048

Estimated Calculated Facts


Effective Temperature6,276 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
A11.10000-7.00000-50.00000F4Yellow/White
B12.70000-7.00000-50.000001991

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