IAU constellation drawing atlas
Ophiuchus constellation
Recognise the shape, know when the whole figure is above your horizon, and practise its 18-segment line map before you step outside.
Observation card
Ophiuchus at a glance
- Best evening month
- July
- Brightest anchor
- Rasalhague (magnitude 2.08)
- Whole-figure latitude range
- -77° to 60°
- Declination span
- -29.9° to 12.6°
- Learning map
- 17 plotted stars · 18 segments
- Catalogue lineage
- ptolemy
How to find Ophiuchus
The complete figure is approximately visible between 77° south and 60° north. It is favourably placed during ordinary evening observing hours in July; the exact hour shifts through the month and with longitude.
Rasalhague, at visual magnitude 2.08, gives the pattern a useful naked-eye anchor. Start at the brightest anchor, then compare the direction and spacing of each neighbouring segment. A moonless night and an unobstructed horizon make the fainter links easier.
What this line map means
It belongs to the classical constellation tradition recorded by Ptolemy. Astral Nest uses a simplified IAU learning figure based on Hipparcos star positions, then projects and normalises it so the pattern is easy to trace on screen.
This diagram teaches relative shape, not absolute sky position. Rotation, scale, atmospheric extinction and local obstruction change what you see outdoors, so use a current planetarium or ephemeris for navigation.
Continue the collection
This figure is outside the current themed card sets. You can still collect it in the 85-card sky atlas.