Jupiter vs Saturn Gas Giant Comparison
Side-by-side comparison of Solar System gas giants Jupiter and Saturn: mass, bulk density, angular diameter, ring systems, and telescope details.
Compared Celestial Objects
Jupiter (Gas Giant & Galilean Moons)
JPL orbital parameters (5.2038 AU, 11.862 yr), opposition magnitude −2.94, 50.1″ angular disk, Galilean moons, and observing guide for Jupiter.
Constellation: Ecliptic (Zodiac) · Coords: 06h 00m 00.00s, +23° 00′ 00.0″
Saturn (Ringed Giant & Cassini Division)
JPL orbital parameters (9.5826 AU, 29.457 yr), ring tilt cycle, Cassini Division resolution, and telescope observing guide for Saturn.
Constellation: Ecliptic (Zodiac) · Coords: 23h 30m 00.00s, -05° 00′ 00.0″
Normalized Shared Parameter Table
| Parameter | Unit / Scale | Jupiter (Gas Giant & Galilean Moons) | Saturn (Ringed Giant & Cassini Division) |
|---|---|---|---|
| Opposition Visual Magnitude (V) | mag | −2.7 to −2.94 | +0.43 to −0.55 (ring tilt dependent) |
| Semi-Major Axis & Orbital Period | AU / yr | 5.204 AU (11.862 yr) | 9.582 AU (29.457 yr) |
| Equatorial Diameter & Mass | km / M⊕ | 142,984 km (317.83 M⊕) | 120,536 km (95.16 M⊕) |
| Mean Bulk Density | g/cm³ | 1.326 g/cm³ | 0.687 g/cm³ (less than water) |
| Opposition Apparent Disk Size | arcsec | 46″ to 50.1″ globe | 18″ to 20.1″ globe (~43″ rings) |
Astrophysical & Observational Synthesis
Although Jupiter contains 3.34 times more mass than Saturn (317.8 M⊕ vs 95.2 M⊕), Jupiter's equatorial diameter is only 18.6% larger than Saturn's (142,984 km vs 120,536 km). Because degenerate metallic hydrogen in a gas giant's interior is highly compressible, adding more mass above ~1 Saturn mass increases gravitational self-compression almost as fast as it adds volume—giving Jupiter nearly double Saturn's mean density (1.326 g/cm³ vs 0.687 g/cm³) and explain why transiting Hot Jupiters and brown dwarfs all cluster near ~1 Jupiter radius.
Because Saturn orbits nearly twice as far from the Sun (9.58 AU vs 5.20 AU), its cooler upper ammonia troposphere forms a thicker, deeper overlying haze layer that mutes its equatorial cloud belts into subtle butterscotch pastels, whereas Jupiter's warmer cloud deck exposes high-contrast reddish-brown belts, white ammonia zones, and the anticyclonic Great Red Spot.
Visually, Jupiter's 48-arcsecond globe and four dancing Galilean moons (including icy Europa) reward 120×–200× with hourly rotational and transit changes (9h 55m day), while Saturn's 273,000-kilometer-wide water-ice A, B, and C rings, the black Cassini Division, and orange moon Titan provide the single most breathtaking sight in amateur astronomy.
Related Reference Guides
Angular Size, Separation & Field of View
How angular diameter (degrees, arcminutes, arcseconds), spherical angular separation, and small-angle physical diameter relate to telescope field of view.
Apparent vs Absolute Magnitude Explained
Understand the logarithmic Pogson astronomical magnitude scale, apparent visual magnitude (m), absolute magnitude (M at 10 parsecs), and bolometric corrections.
Primary Catalogs & Scientific Sources
- ESA Gaia Archive — Data Release 3 (DR3 (2022-06-13)): Gaia Collaboration, Vallenari, A., et al. 2023, A&A, 674, A1 (Gaia Data Release 3) — European Space Agency / Gaia DPAC
- 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
- Revised New General Catalogue and Index Catalogue (RNGC/IC) (2024/2026 edition): Steinicke, W. 2010, Observing and Cataloguing Nebulae and Star Clusters (Cambridge Univ. Press); Verga, M. OpenNGC (CC-BY-SA 4.0 / data tables) — Wolfgang Steinicke / OpenNGC