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TW Hydrae
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Star TW Hydrae

T Tauri star TW Hydrae is located 196 light years away from the Sun. It is a single star of spectral class K6, that has 90 % of solar mass. There are multiple known exoplanets in this system.
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Sun distance
196 light years
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TW Hydrae

T Tauri star
Spectral class: K6

Location +

Ascension iconRight ascension: 11h 1m 51.825s
Declination iconDeclination: -34° 42' 17.256'' (southern hemisphere)
Parallax iconParallax: 16.629
Distance iconSun distance: 196.138 ly | 60.1 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: 90 % M Sun
| 943 M Jupiter
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Star mass
Mass of the star TW Hydrae is 0.9 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: 111 % R Sun
| 11 R Jupiter
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Star size
Radius of the star TW Hydrae is 1.11 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: 4000 K | 0.69 T Sun
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Star temperature
Surface temperature of TW Hydrae is 4000 K, which is 69 % 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: 0.008 billions years | 0 Sun
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Star age
Star TW Hydrae is 0.008 billion years old, which is about 0 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: 0.28 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 iconAbsolute magnitude (V): -3.9
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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TW Hydrae system structure

 TW Hydrae
TW Hydrae disc 3 AU -
TW Hydrae b
unconfirmed
 22 AU 23.7 M⊕ 4.3 R⊕ -
TW Hydrae c
unconfirmed
 42 AU 4 M⊕ -

More about TW Hydrae

Star TW Hydrae is is approximately 11 % bigger than the Sun and temperature on its surface is around 4000 K (3727 °C), which is about 69 % of Sun's temperature.
       TW Hydrae can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
TWA 1, TW Hya, CD−34° 7151, HIP 53911, Gaia DR3 5401795662560500352
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External sources
icon study
icon study
icon study
First Detection of HC5N in a Class II Disk around TW Hya
Scientific study, Accepted: 01. 06. 2026
icon study
Ortho-Para Chemistry of H2CO in the Protoplanetary Disk TW Hya
Scientific study, Accepted: 13. 03. 2026
icon study
icon study
icon study
The TW Hydrae Association is a cluster chain of Sco-Cen
Scientific study, Accepted: 20. 01. 2025
icon study
icon study
Outflow Driven by a Protoplanet Embedded in the TW Hya Disk
Scientific study, Accepted: 19. 07. 2024
icon study
gaia icon
Gaia database (Gaia DR3 5401795662560500352)
Archive from the Gaia mission

News from this star system

High resolution imaging reveals double-peaked dust structure in the TW Hydrae disk
icon29. 9. 2026
Image: High resolution imaging reveals double-peaked dust structure in the TW Hydrae disk
New observations of the TW Hydrae protoplanetary disk reveal a dust structure at 52 astronomical units that features a double-peaked shape. The dust moves according to local orbital rules, and the lack of gas signatures suggests no massive planet is present....
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High resolution imaging reveals structural details of the protoplanetary disk around TW Hydrae
icon1. 8. 2026
Image: High resolution imaging reveals structural details of the protoplanetary disk around TW Hydrae
Detailed imaging of the protoplanetary disk around TW Hydrae reveals new insights into its structure, including a possible warp and a bifurcated outer feature. Observations from JWST provide some of the strictest limits yet on hidden planetary companions....
Read article tag icon
ALMA observations detect complex carbon-chain molecule HC5N in the TW Hya protoplanetary disk
icon4. 6. 2026
Image: ALMA observations detect complex carbon-chain molecule HC5N in the TW Hya protoplanetary disk
ALMA has detected the complex molecule HC5N in the protoplanetary disk around the star TW Hya. This marks the first such detection in a Class II disk and provides new insights into the carbon-chain chemistry present during the planet-forming process....
Read article tag icon

Frequently Asked Questions

How far is the TW Hydrae system from the Sun?

The TW Hydrae system is 196 light years or 60.1 parsecs from the Sun.

What galaxy is the TW Hydrae star in?

The TW Hydrae is in the Milky Way galaxy just like the Sun.

How many stars are in the TW Hydrae system?

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

What type of star is the TW Hydrae?

The star TW Hydrae is a T Tauri star star.

What temperature is star TW Hydrae?

The star TW Hydrae has an effective temperature of 4000 K. Find out more about the temperature of stars in Stellar guide
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