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AT Microscopii

AT Microscopii Facts

  • AT Microscopii is a star that can be located in the constellation of Microscopium. The description is based on the spectral class.
  • AT Microscopii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (Mpe) 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 34.88 light years away from us. Distance

AT Microscopii's Alternative Names

HIP102141 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD196982. The Gliese ID of the star is GL 799A. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

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

Location of AT Microscopii

The location of the 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 Microscopii, the location is 20h 41m 50.97 and -32° 26` 03.6 .

Radial Velocity and Proper Motion of AT Microscopii

Proper Motion

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 -365.60 ± 2.37 milliarcseconds/year towards the north and 270.45 ± 3.67 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -4.00000 km/s with an error of about 3.70 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.

Physical Properties of AT Microscopii

AT Microscopii Temperature and Colour

Based on the star's spectral type of Mpe , AT Microscopii's colour and type is red star. The star has a B-V Colour Index of 1.55 which means the star's temperature is about 3,903 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AT Microscopii Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 0.03 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

AT Microscopii Radius

AT Microscopii estimated radius has been calculated as being 0.18 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 128,377.94.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.1931999233669966981605845277. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

AT Microscopii Apparent and Absolute Magnitudes

AT Microscopii has an apparent magnitude of 10.27 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 10.22 If you used the 2007 Parallax value, you would get an absolute magnitude of 10.12. 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 Microscopii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 97.80000 which gave the calculated distance to AT Microscopii as 33.35 light years away from Earth or 10.22 parsecs. If you want that in miles, it is about 196,052,156,195,673.39, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 93.50000 which put AT Microscopii at a distance of 34.88 light years or 10.70 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.

Using the 2007 distance, the star is roughly 2,207,018.05 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. The star's Galacto-Centric Distance is 7,392.00 Parsecs or 24,109.99 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to AT Microscopii

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking45,847,777,004.88
Car120194,925,900.16
Airbus A38073631,781,396.77
Speed of Sound (Mach 1)767.26930,486,189.35
Concorde (Mach 2)1,534.5415,243,074.81
New Horizons Probe33,000708,821.46
Speed of Light670,616,629.0034.88

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 Microscopii Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAT Microscopii
Alternative NamesHD 196982, HIP 102141, Gliese 799A
Spectral TypeMpe
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeStar
ColourRed
GalaxyMilky Way
ConstellationMicroscopium
Absolute Magnitude 10.22 / 10.12
Visual / Apparent Magnitude10.27
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)20h 41m 50.97
Declination (Dec.)-32° 26` 03.6
Galactic Latitude-36.34175172 degrees
Galactic Longitude11.14142619 degrees
1997 Distance from Earth97.80000 Parallax (milliarcseconds)
 33.35 Light Years
 10.22 Parsecs
2007 Distance from Earth93.50000 Parallax (milliarcseconds)
 34.88 Light Years
 10.70 Parsecs
 2,207,018.05 Astronomical Units
Galacto-Centric Distance24,109.99 Light Years / 7,392.00 Parsecs
Proper Motion Dec.-365.60000 ± 2.37000 milliarcseconds/year
Proper Motion RA.270.45000 ± 3.67000 milliarcseconds/year
B-V Index1.55
Radial Velocity-4.00000 ± 3.70 km/s
Eccentricity0.02710
Semi-Major Axis7246.0000000
Stellar Luminosity (Lsun)0.0300000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)0.19
Effective Temperature3,903 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
196982-3216135.2B10.50000273.00000-331.00000M3Red
BC10.80000273.00000-331.00000M3Red1959

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