Draco (The Dragon) Constellation Sky Guide
Draco IAU constellation (1083 sq deg, rank 8): winding July circumpolar giant around Ursa Minor with Eltanin (+2.23), Thuban, and the Cat's Eye Nebula.
Sky Navigation & Astrophysical Context
Coiling across 1,083 square degrees around the Little Dipper of Ursa Minor, Draco is the eighth-largest constellation in the sky and is circumpolar for all mid-to-high northern latitudes. Its long, sinuous body begins between the Big and Little Dippers near Lambda Draconis (Giausar), winds eastward past Thuban (Alpha Draconis), loops northward toward Cepheus, and curves back south to terminate in the four-star trapezoid of the Dragon's Head ('The Lozenge') just north of Hercules and Vega.
Two stars in Draco carry monumental historical weight: Thuban (Alpha Draconis, V = +3.67), a rather modest A0 III giant in the tail, served as the naked-eye North Pole Star around 2800 BCE during the construction of the Old Kingdom Egyptian pyramids; meanwhile, Eltanin (Gamma Draconis, V = +2.23), a K5 III orange giant in the Dragon's Head that passes right through the zenith of London, was the star in which James Bradley discovered the aberration of starlight in 1728—providing the first direct observational proof that Earth revolves around the Sun.
Nestled near the North Ecliptic Pole (RA 18h 00m 00s, Dec +66° 33′ 38.6″) halfway between Zeta and Delta Draconis shines the Cat's Eye Nebula (NGC 6543 / Caldwell 6), a high-surface-brightness, multi-shell planetary nebula with a +11.1-magnitude Wolf-Rayet central star, while western Draco contains the edge-on lenticular Spindle Galaxy (NGC 5866 / Messier 102 candidate) and the Tadpole Galaxy (UGC 10214).
Equatorial Center Position & Transit Altitude
Draco is centered near Right Ascension 15h 09m 00s, Declination +67° 00′ 36″ (The Dragon).
Practical Star-Hopping & Observing Tips
- Find the 4-star Lozenge head of Draco (Eltanin, Rastaban, Xi, and Nu Draconis) 12° northwest of brilliant Vega.
- Point binoculars or a low-power scope at Nu Draconis (Kuma) at the western tip of the Dragon's Head to split its twin +4.9-magnitude white A-stars separated by 62 arcseconds.
- Aim midway between Zeta and Delta Draconis at 150×+ to see the vivid turquoise-blue disk of the Cat's Eye Nebula (NGC 6543).
Notable Celestial Objects in & Near Draco
| Object | Family | Classification | RA (J2000) | Dec (J2000) | Min. Instrument |
|---|---|---|---|---|---|
| Polaris (Alpha Ursae Minoris North Star) | variable-stars | Classical Cepheid supergiant variable in a triple star system | 02h 31m 49.09s | +89° 15′ 50.8″ | Naked eye (50–60 mm telescope at 60×+ to split Polaris B) |
| Vega (Alpha Lyrae Zero-Point Star) | stars | Rapidly rotating A-type main-sequence star with debris disk | 18h 36m 56.34s | +38° 47′ 01.3″ | Naked eye |
| Messier 92 (NGC 6341 in Hercules) | globular-clusters | Globular cluster | 17h 17m 07.40s | +43° 08′ 09.4″ | 7×50 binoculars |
| Cat's Eye Nebula (NGC 6543 in Draco) | nebulae | Multi-shell planetary nebula with concentric rings and bipolar jets | 17h 58m 33.42s | +66° 37′ 59.5″ | 60 mm telescope (color visible in 80–100 mm scopes) |
Scientific Sources Cited
- IAU Official Constellation Boundaries & Designations (IAU 88 Recognized Constellations): Delporte, E. 1930, Délimitation scientifique des constellations (IAU / Cambridge University Press) — International Astronomical Union (IAU)
- SIMBAD Astronomical Database (CDS) (2026-10 release): Wenger, M., et al. 2000, A&AS, 143, 9 (The SIMBAD astronomical database) — Centre de Données astronomiques de Strasbourg