Aries

Ari · genitive Arietis · northern sky

The Aries figure as the IAU defines it, drawn looking south with east to the left — the orientation you see standing outside.

At a glance

Catalogued stars
85
Visible to the eye
85 stars
Brightest star
Hamal (2.01)
Best seen
October
Declination span
+19.3° to +27.3°
Nearest star
Sheratan · 58.7 ly

Visible from everywhere north of about 63°S.

When and where to look for Aries

Aries crosses the meridian — its highest point in the sky — at local midnight around October, which makes the months from September to November the easiest time to find it in the evening. It spans declinations +19.3° to +27.3°, so visible from everywhere north of about 63°S.

The quickest way to find it is to open the live AR sky map and point your phone at the sky — if Aries is above your horizon right now, its figure is drawn in the position it genuinely occupies above you.

Brightest stars in Aries

StarMagTypeDistance
Hamal13Alp Ari2.01K2III65.8 ly
Sheratan6Bet Ari2.64A5V...58.7 ly
Bharani41 Ari3.61B8Vn165.6 ly
Mesarthim5Gam2Ari3.88A1p Si164.1 ly
Botein57Del Ari4.35K2IIIvar169.7 ly
HD 206444.47K2II-III542.7 ly

Magnitude runs backwards: lower numbers are brighter, and anything below about 6.5 is beyond the naked eye under a dark sky.

What Aries is made of

The catalogue lists 85 stars within Aries, of which 85 are magnitude 6.5 or brighter — the limit of what an unaided eye picks up under a genuinely dark sky. The rest need binoculars or a telescope.

Spectral make-up

B14
A21
F16
G5
K24
M5

Spectral class is a temperature ordering, running from O at around 30,000 K down to M below 3,500 K. A constellation is a direction, not a group, so this is simply what happens to lie along that line of sight.

The closest catalogued star in this direction is Sheratan at 58.7 light years. The most distant is 55 Ari at roughly 1,056 light years — stars that appear side by side here are nothing of the sort.

Nearby constellations