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TOI 5817
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Star TOI 5817

Subgiant TOI 5817 is located 262 light years away from the Sun. It is a single star of spectral class G2 IV-V, that has 97 % of solar mass. There is at least one exoplanet in this system.
Sun distance
262 light years
galaxy map

TOI 5817

Subgiant
Spectral class: G2 IV-V

Location +

Ascension iconRight ascension: 21h 29m 30.676s
Declination iconDeclination: 21° 28' 28.252'' (northern hemisphere)
Parallax iconParallax: 12.447
Distance iconSun distance: 262.036 ly | 80.3 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: 97 % M Sun
| 1016 M Jupiter
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Star mass
Mass of the star TOI 5817 is 0.970 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: 143 % R Sun
| 14.2 R Jupiter
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Star size
Radius of the star TOI 5817 is 1.427 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: 5770 K | 1 T Sun
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Star temperature
Surface temperature of TOI 5817 is 5770 K, which is 100 % 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: 2.05 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

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 5817 system structure

 TOI 5817
TOI 5817 b 0.12 AU 10.3 M⊕ 3.1 R⊕ 15.6 days
More about TOI 5817
Star TOI 5817 is is approximately 43 % bigger than the Sun and temperature on its surface is around 5770 K (5497 °C), which is about 100 % of Sun's temperature.
       TOI 5817 can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
TOI-5817, starAsc=21.492025&starDec=21.474514&starPlx=12.447&starDistance=
External sources
icon study
The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)
Scientific study, Accepted: 15. 05. 2025
gaia icon
Gaia database (starAsc=21.492025&starDec=21.474514&starPlx=12.447&starDistance=)
Archive from the Gaia mission
Class of stars Subgiant
A subgiant is a term used to describe a luminous star that is typically running out of hydrogen for nuclear fusion and is thus departing from the main sequence. These stars are classified as Yerkes luminosity class IV.

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