Where does this data come from?

Values are rounded from NASA planetary fact sheets — equatorial diameter, mass relative to Earth, mean surface gravity, mean orbital distance in AU, orbital period in Earth years, sidereal rotation period and known moon counts.

Why is Pluto included if it is not a planet?

Pluto is included as a dwarf planet for reference, clearly labelled, because it is still commonly looked up alongside the eight planets.

Which planet is the largest?

Jupiter is the largest planet, with an equatorial diameter of about 142,984 km and a mass 317.8 times Earth's — more than all the other planets combined.

Which planet has the most moons?

By this reference, Saturn leads with about 146 known moons, narrowly ahead of Jupiter at about 95. Moon counts keep rising as surveys discover more small satellites.

What is an astronomical unit (AU)?

One AU is the mean Earth–Sun distance, about 149.6 million km. Distances in the table are given in AU, so Mars at 1.52 AU is just over 1.5 times Earth's distance from the Sun.

Why is a day on Venus so long?

Venus rotates very slowly, taking about 2,802 hours (roughly 117 Earth days) for one rotation — longer in some respects than its 0.62-year orbit, and it spins in the opposite direction to most planets.

Is anything uploaded?

No — this is a static reference table that runs entirely in your browser.

Planetary Data Reference

Planetary data at a glance

A compact reference for the eight planets plus Pluto, giving equatorial diameter, mass relative to Earth, surface gravity, mean distance from the Sun in astronomical units, length of day (rotation) and number of moons. It is handy for homework, quizzes, model-building and quick fact-checks.

How it works

This is a static lookup table — type a planet name to filter it, or leave the box blank to see every body. Distances are in AU, where 1 AU ≈ 149.6 million km, and the day column is the sidereal rotation period in hours. Mass is expressed relative to Earth (Earth = 1).

Reference table

Body	Diameter (km)	Mass (Earth=1)	Gravity (m/s²)	Distance (AU)	Day (h)	Moons
Mercury	4,879	0.0553	3.7	0.39	4222.6	0
Venus	12,104	0.815	8.87	0.72	2802.0	0
Earth	12,756	1	9.81	1.00	24.0	1
Mars	6,792	0.107	3.71	1.52	24.7	2
Jupiter	142,984	317.8	24.79	5.20	9.9	95
Saturn	120,536	95.2	10.44	9.58	10.7	146
Uranus	51,118	14.5	8.87	19.20	17.2	28
Neptune	49,528	17.1	11.15	30.05	16.1	16
Pluto (dwarf)	2,376	0.0022	0.62	39.48	153.3	5

Example

Looking up Mars: a diameter of 6,792 km (about half Earth’s), 0.107 Earth masses, gravity of 3.71 m/s² (about 38% of Earth’s), at 1.52 AU from the Sun, with a 24.7-hour day and 2 moons.

Values are rounded from NASA planetary fact sheets. Everything runs in your browser.