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AU Microscopii
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Star AU Microscopii

Red dwarf AU Microscopii is located 32 light years away from the Sun. It is a single flare star of spectral class M1 Ve, that has 50 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
32 light years
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AU Microscopii

Red dwarf, flare star, Low-mass star
Spectral class: M1 Ve

Location +

Ascension iconRight ascension: 20h 45m 9.885s
Declination iconDeclination: -31° 20' 33.000'' (southern hemisphere)
Parallax iconParallax: 102.943
Distance iconSun distance: 31.683 ly | 9.7 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 50 % M Sun
| 524 M Jupiter
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Star mass
Mass of the star AU Microscopii is 0.5 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 75 % R Sun
| 7.5 R Jupiter
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Star size
Radius of the star AU Microscopii is 0.75 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature icon
Temperature: 3700 K | 0.64 T Sun
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Star temperature
Surface temperature of AU Microscopii is 3700 K, which is 64 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
time icon
Age: 0.022 billions years | 0 Sun
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Star age
Star AU Microscopii is 0.022 billion years old, which is about 0 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 0.09 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 8.6
Magnitude iconAbsolute magnitude (V): 8.7
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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AU Microscopii system structure

 AU Microscopii
AU Microscopii d
unconfirmed
 n/a 2.9 M⊕ 33.4 days
AU Microscopii e
unconfirmed
 n/a 2.9 M⊕ 12.7 days
AU Microscopii b 0.08 AU 11.7 M⊕ 4.2 R⊕ 8.5 days
AU Microscopii c 0.11 AU 32.1 M⊕ 3.1 R⊕ 18.9 days

More about AU Microscopii

Nearby star AU Microscopii is a main sequence star that fuses hydrogen atoms into helium. It is approximately 80 % of the size of Sun and temperature on its surface is around 3700 K (3427 °C), which is about 64 % of Sun's temperature.
       AU Microscopii can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
AU Mic, Gliese 803, GJ 803, LDS 720A, HD 197481, HIC 102409, HIP 102409, LTT 8214, NLTT 49807, MCC 824, 2MASS J20450949-3120266, TOI-2221, TIC 441420236, Gaia EDR3 6794047652729201024
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External sources
icon study
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Six-yr SPIRou monitoring of the young planet-host dwarf AU Mic
Scientific study, Accepted: 02. 07. 2025
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Spectroscopic observations of flares and superflares on AU Mic
Scientific study, Accepted: 12. 12. 2024
icon study
A possible misaligned orbit for the young planet AU Mic c
Scientific study, Accepted: 25. 11. 2024
simbad icon
Simbad database (V* AU Mic)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 6794047652729201024)
Archive from the Gaia mission
tess icon
TESS database (TOI 2221.01)
Archive from the TESS mission

News from this star system

Inclined eccentric planet model explains moving dust clumps around the star AU Microscopii
icon1. 8. 2026
Image: Inclined eccentric planet model explains moving dust clumps around the star AU Microscopii
New simulations suggest the moving dust clumps around the red dwarf AU Microscopii could be caused by a hidden planet. A model with an inclined, eccentric planet of 2 Jupiter masses reproduces the observed disk structures via stellar wind interactions....
Read article tag icon
AU Mic’s young planets show aligned orbits, but stellar activity complicates measurements
icon30. 5. 2026
Image: AU Mic’s young planets show aligned orbits, but stellar activity complicates measurements
New observations show AU Mic’s young planets have orbits aligned with their star, but stellar activity makes precise measurements tricky. The system’s calm history offers clues to planet formation....
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AU Microscopii has at least two spectral components: a 4000 K ambient photosphere and cool spots that have a temperature of 3000 K
icon1. 1. 1970
Image: AU Microscopii has at least two spectral components: a 4000 K ambient photosphere and cool spots that have a temperature of 3000 K
...
Read article tag icon

Frequently Asked Questions

How far is the AU Microscopii system from the Sun?

The AU Microscopii system is 32 light years or 9.7 parsecs from the Sun.

What galaxy is the AU Microscopii star in?

The AU Microscopii is in the Milky Way galaxy just like the Sun.

How many stars are in the AU Microscopii system?

The AU Microscopii is a single star, there are no other known stars in the system.

What type of star is the AU Microscopii?

The star AU Microscopii is a Red dwarf star.

What temperature is star AU Microscopii?

The star AU Microscopii has an effective temperature of 3700 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.

They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
Closest stars

 AT Microscopii
 0.25 M☉ 1 ly

PM J20502-3424
 - 1.8 ly

2MASS J2049-4012
 0 M☉ 4.9 ly

5 G. Capricorni
 0.78 M☉ 5.1 ly

WISE J2102-4429
 - 8.7 ly
3D map of stellar neighborhood
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