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TOI 421
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Star TOI 421

Binary star TOI 421 is located 245 light years away from the Sun. It consists of a yellow star and a red dwarf. There are multiple known exoplanets in this system.
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Sun distance
245 light years
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TOI 421 A

Yellow star
Spectral class: G9V

Location +

Ascension iconRight ascension: 5h 27m 24.791s
Declination iconDeclination: -14° 16' 36.240'' (equatorial region)
Parallax iconParallax: 13.334
Distance iconSun distance: 244.610 ly | 75.0 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: 83.3 % M Sun
| 873 M Jupiter
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Star mass
Mass of the star TOI 421 A is 0.833 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: 87 % R Sun
| 8.6 R Jupiter
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Star size
Radius of the star TOI 421 A is 0.866 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: 5291 K | 0.92 T Sun
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Star temperature
Surface temperature of TOI 421 A is 5291 K, which is 92 % 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: 10.9 billions years | 2.37 Sun
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Star age
Star TOI 421 A is 10.9 billion years old, which is about 2.37 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

Photometry

Magnitude iconApparent magnitude (V): 9.9
Magnitude iconAbsolute magnitude (V): 5.6
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

TOI 421 B

Red dwarf

Location +

Distance iconDistance from the primary: 2206 AU

Basic characteristic

temperature iconTemperature: 5200 K
 (estimate)
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Star temperature
Surface temperature of TOI 421 B is estimated to be 5232 K, which is 90 % 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

Photometry

Magnitude iconAbsolute magnitude (V): -4.4
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
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TOI 421 system structure

 TOI 421 A
TOI 421 A b 0.06 AU 6.7 M⊕ 2.6 R⊕ 5.2 days
TOI 421 A c 0.12 AU 14.1 M⊕ 5.1 R⊕ 16.1 days
TOI 421 B 2206 AU

More about TOI 421

       TOI 421 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
BD-14 1137, Gaia DR3 2984582227215748864
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Frequently Asked Questions

How far is the TOI 421 system from the Sun?

The TOI 421 system is 245 light years or 75.0 parsecs from the Sun.

What galaxy is the TOI 421 star in?

The TOI 421 is in the Milky Way galaxy just like the Sun.

How many stars are in the TOI 421 system?

The TOI 421 system contains 2 stars.

What type of star is the TOI 421?

The primary in the TOI 421 system is a Yellow star star.

What temperature is star TOI 421?

The primary in the TOI 421 system has a temperature of 5291 K. Find out more about the temperature of stars in Stellar guide
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