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Iota Boötis
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Star Iota Boötis

Binary star Iota Boötis is located 96 light years away from the Sun. It consists of a white-blue star and a orange star. For now, there are no known exoplanets in this star system.
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Sun distance
96 light years
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Iota Boötis A

White-Blue star, Delta Scuti variable
Spectral class: A7V

Location +

Ascension iconRight ascension: 14h 16m 9.676s
Declination iconDeclination: 51° 22' 3.455'' (northern hemisphere)
Parallax iconParallax: 33.886
Distance iconSun distance: 96.252 ly | 29.5 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 Boötis A is 1.650 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: 172 % R Sun
| 17.1 R Jupiter
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Star size
Radius of the star Iota Boötis A is 1.715 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: 7764 K | 1.34 T Sun
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Star temperature
Surface temperature of Iota Boötis A is 7764 K, which is 134 % 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: 0.785 billions years | 0.17 Sun
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Star age
Star Iota Boötis A is 0.785 billion years old, which is about 0.17 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: 8.90 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): 4.8
Magnitude iconAbsolute magnitude (V): 2.4
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 Boötis B

Orange star, , Delta Scuti variable
Spectral class: K0V

Location +

Distance iconDistance from the primary: 1100 AU

Basic characteristic

icon weight
Mass: 80.7 % M Sun
| 845 M Jupiter
+
Star mass
Mass of the star Iota Boötis B is 1.650 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: 82 % R Sun
| 8.2 R Jupiter
+
Star size
Radius of the star Iota Boötis B is 0.824 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: 5090 K | 0.88 T Sun
+
Star temperature
Surface temperature of Iota Boötis B is 5090 K, which is 88 % 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
luminosity icon
Luminosity: 0.411 L Sun
+
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

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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Iota Boötis system structure

 Iota Boötis A
Iota Boötis B 1100 AU

More about Iota Boötis

      a pulsating star belonging to the Delta Scuti category. These stars expand and contract with a period in mere hours.  Iota Boötis 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. 

      Iota Boötis is a pulsating star belonging to the Delta Scuti category. These stars expand and contract with a period in mere hours.
Other designations of this star
HD 234121, Asellus Secondus[12], ι Boötis, 21 Boötis, BD+52°1784, FK5 528, GC 19269, HD 125161, HIP 69713, HR 5350, SAO 29071, PPM 34432, WDS J14162+5122, iot Boo, , Gaia DR3 1511727333122255744
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Frequently Asked Questions

How far is the Iota Boötis system from the Sun?

The Iota Boötis system is 96 light years or 29.5 parsecs from the Sun.

What galaxy is the Iota Boötis star in?

The Iota Boötis is in the Milky Way galaxy just like the Sun.

How many stars are in the Iota Boötis system?

The Iota Boötis system contains 2 stars.

What type of star is the Iota Boötis?

The primary in the Iota Boötis system is a White-Blue star star.

What temperature is star Iota Boötis?

The primary in the Iota Boötis system has a temperature of 7764 K. Find out more about the temperature of stars in Stellar guide
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Lambda Boötis
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