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Iota Leonis Aa
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Star Iota Leonis Aa

Triple star system Iota Leonis Aa is located 77 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
Sun distance
77 light years
galaxy map

Iota Leonis Aa

Subgiant, High proper motion star
Spectral class: F1IV

Location +

Ascension iconRight ascension: 11h 23m 55.462s
Declination iconDeclination: 10° 31' 46.223'' (equatorial region)
Parallax iconParallax: 42.35
Distance iconSun distance: 77.014 ly | 23.6 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: 165 % M Sun
| 1728 M Jupiter
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Star mass
Mass of the star Iota Leonis Aa is 1.65 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: 210 % R Sun
| 20.9 R Jupiter
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Star size
Radius of the star Iota Leonis Aa is 2.1 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: 6739 K | 1.17 T Sun
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Star temperature
Surface temperature of Iota Leonis Aa is 6739 K, which is 117 % 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: 1.7 billions years | 0.37 Sun
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Star age
Star Iota Leonis Aa is 1.7 billion years old, which is about 0.37 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: 11.5 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): 4.1
Magnitude iconAbsolute magnitude (V): 2.2
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

Iota Leonis Ab

Yellow-White star, , High proper motion star

Basic characteristic

Iota Leonis B

Bright giant, High proper motion star
Spectral class: G3V

Basic characteristic

icon weight
Mass: 108 % M Sun
| 1131 M Jupiter
+
Star mass
Mass of the star Iota Leonis B is solar masses (or 0 Jupiter 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: 130 % R Sun
| 13.2 R Jupiter
(estimate)
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Star size
Radius of the star Iota Leonis B is not known. Its estimated value based on other similar stars is about 130 % 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

Photometry

Magnitude iconApparent magnitude (V): 6.7
Magnitude iconAbsolute magnitude (V): 4.8
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

Iota Leonis Aa system structure

 Iota Leonis Aa
Iota Leonis Ab
Iota Leonis B
More about Iota Leonis Aa
       Iota Leonis Aa can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
GJ 11625, Gliese 11625, ι Leo, 78 Leonis, Gliese 426.1, BD+11°2348, HD 99028, HIP 55642, HR 4399, SAO 99587, Gaia DR3 3915612630249291008
External sources
simbad icon
Simbad database (* iot Leo B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
Closest stars

 StKM 2-732
 - 1.3 ly

Wolf 373
 - 4.3 ly

2MASS J11391107+0841121
 - 5.7 ly

88 Leonis
 1.1 M☉ 5.8 ly

RX J1113.0+1025
 - 5.9 ly
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