Aries
Ari · genitive Arietis · northern sky
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
| Star | Mag | Type | Distance |
|---|---|---|---|
| Hamal13Alp Ari | 2.01 | K2III | 65.8 ly |
| Sheratan6Bet Ari | 2.64 | A5V... | 58.7 ly |
| Bharani41 Ari | 3.61 | B8Vn | 165.6 ly |
| Mesarthim5Gam2Ari | 3.88 | A1p Si | 164.1 ly |
| Botein57Del Ari | 4.35 | K2IIIvar | 169.7 ly |
| HD 20644 | 4.47 | K2II-III | 542.7 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
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.