Star profile

21 Arietis

3D likeness based on its real data · class F · ~6,500 K

What is 21 Arietis

21 Arietis is a yellow-white F-type star 167 light-years away, set in Aries, one of the oldest zodiacal figures of the heavens. It is slightly hotter than the Sun, just enough to push its colour toward a white barely tinted with gold. For the Babylonians, Aries marked the start of the astronomical year when the equinox fell within it —precession has long since carried that point away.

Where it is and when to see it

21 Arietis lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is November, when it culminates around midnight.

From London it culminates about 64° above the horizon.
From New York it culminates about 74° above the horizon.
From Sydney it culminates about 31° above the horizon.

It can be seen from anywhere north of 65° S.

It ranks no. 27 in brightness among the 57 stars of Aries in our catalogue. To find it, start from Hamal, the brightest: it lies about 3° away (a fist at arm's length covers about 10°).

The light you see today left it about 170 years ago.

Find it on the sky map

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

Leave your signature on 21 Arietis

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 21 Arietis

Constellation: Aries
Apparent magnitude: 5.57
Distance: 166.6 light years
Coordinates (J2000): RA 33.928° · Dec 25.043°
Catalogue: HIP 10535 · HD 13872

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

Other stars in Aries

Aries has 57 stars in Stelvia's catalogue. Here are a few of them.

See all 57 stars in Aries