Access official International Astronomical Union (IAU) multi-hemisphere constellation boundaries defined by precise Right Ascension (RA) and Declination (DEC) corners. Optimize your deep-sky tracking with standardized coordinate grids and positional telemetry nodes.
Complete list of the 88 modern constellations defined by the International Astronomical Union (IAU). Boundaries are fixed in equatorial coordinates (RA / Dec).
| # | Constellation | Abbr | Area |
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The International Astronomical Union (IAU) recognizes **88 official constellations**. These act as "territories" in the sky, ensuring every star belongs to a specific region.
OFFICIAL LISTNot all patterns are constellations. An **asterism** is a popular pattern within or across constellations, like the Big Dipper (part of Ursa Major) or the Summer Triangle.
PATTERN GUIDEThe **Zodiac** consists of 13 constellations (including Ophiuchus) that lie along the Ecliptic—the apparent path the Sun follows across the sky throughout the year.
ECLIPTIC DATAStay updated with the latest astronomical discoveries, space mission updates, and community events from HORIZONS. It is an honor to have you join our journey through the stars.