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45 Boötis
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Star 45 Boötis

Yellow-White star 45 Boötis is located 64 light years away from the Sun. It is a single star of spectral class F5V, that has 121 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
64 light years
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45 Boötis

Yellow-White star, High proper motion star
Spectral class: F5V

Location +

Ascension iconRight ascension: 15h 7m 18.286s
Declination iconDeclination: 24° 52' 6.471'' (northern hemisphere)
Parallax iconParallax: 51.188
Distance iconSun distance: 63.718 ly | 19.5 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: 121 % M Sun
| 1268 M Jupiter
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Star mass
Mass of the star 45 Boötis is 1.21 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: 146 % R Sun
| 14.5 R Jupiter
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Star size
Radius of the star 45 Boötis is 1.461 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: 6435 K | 1.11 T Sun
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Star temperature
Surface temperature of 45 Boötis is 6435 K, which is 111 % 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: 1.6 billions years | 0.35 Sun
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Star age
Star 45 Boötis is 1.6 billion years old, which is about 0.35 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: 3.30 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): 4.9
Magnitude iconAbsolute magnitude (V): 3.5
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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45 Boötis system structure

 45 Boötis

More about 45 Boötis

Nearby star 45 Boötis is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 46 % bigger than the Sun and temperature on its surface is around 6435 K (6162 °C), which is about 111 % of Sun's temperature.
       45 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.
Other designations of this star
c Boo, 45 Boo, NSV 6945, BD+25°2873, FK5 1396, GJ 578, Gliese 578, HD 134083, HIP 73996, HR 5634, SAO 83671, WDS J15073+245, Gaia DR3 1264630412816366720
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External sources
simbad icon
Simbad database (* c Boo)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 1264630412816366720)
Archive from the Gaia mission

Frequently Asked Questions

How far is the 45 Boötis system from the Sun?

The 45 Boötis system is 64 light years or 19.5 parsecs from the Sun.

What galaxy is the 45 Boötis star in?

The 45 Boötis is in the Milky Way galaxy just like the Sun.

How many stars are in the 45 Boötis system?

The 45 Boötis is a single star, there are no other known stars in the system.

What type of star is the 45 Boötis?

The star 45 Boötis is a Yellow-White star star.

What temperature is star 45 Boötis?

The star 45 Boötis has an effective temperature of 6435 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 BD+25 2874
 - 1.6 ly

HP Boötis
 0.97 M☉ 6.1 ly

HD 136923
 - 7.8 ly

2MASSI J1526140+204341
 - 7.9 ly

LP 327-57
 - 8.3 ly
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