Skip to main content
Stelvia
Back to the selector

Star profile

Theta Trianguli Australis

3D likeness based on its real data · class G · ~5,500 K

What is Theta Trianguli Australis

Theta Trianguli Australis is a yellow star about 342 light-years away, in the little southern triangle. That geometric figure, proposed by sixteenth-century European navigators, is the southern counterpart to its northern cousin. Theta is one of the secondary vertices —not the bright apex, but the quiet pivot that holds the shape.

Where it is and when to see it

Theta Trianguli Australis lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is June, when it culminates around midnight.

  • From London it never rises above the horizon.
  • From New York it never rises above the horizon.
  • From Sydney it never sets and culminates about 58° up.

It can be seen from anywhere south of 25° N.

It ranks no. 11 in brightness among the 21 stars of Triangulum Australe in our catalogue. To find it, start from Atria, the brightest: it lies about 4° away (a fist at arm's length covers about 10°).

The light you see today left it about 340 years ago.

Find it on the sky map

It opens in your browser. Free, no account, nothing to install.

Leave your signature on Theta Trianguli Australis

Your name and a message go up on the map for everyone to read. Signing is free.

Without a lock, someone else can replace your signature. How the lock works

We'll ask for an email to confirm it's you, no password.

Write my signature

A public signature from a real person. The chosen name is a symbolic denomination within Stelvia, with no official standing or IAU recognition: the sky is not for sale and belongs to no one.

Astronomical data for Theta Trianguli Australis

Constellation
Triangulum Australe
Apparent magnitude
5.50
Distance
342.3 light years
Coordinates (J2000)
RA 248.937° · Dec -65.495°
Catalogue
HIP 81252 · HD 148890

A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.

Other stars in Triangulum Australe

Triangulum Australe has 21 stars in Stelvia's catalogue. Here are a few of them.

See all 21 stars in Triangulum Australe