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— Catalogue I · The Eight

Eight planets,
in close detail.

Each entry below pairs current data with a short note from the field — what to expect when you find it in the eyepiece.

Mercury
Mercury
Venus
Venus
Earth
Earth
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn
Uranus
Uranus
Neptune
Neptune
Mercury
01 / 08
Inner · Terrestrial

Mercury

Smallest planet; cratered like the Moon

Distance
57.9 M km
Rotation
88 Earth days
Moons
0
Radius
2,440 km

Best caught at greatest elongation — west of the Sun before dawn, east in the evening sky. Never linger long.

Venus
02 / 08
Inner · Terrestrial

Venus

Hottest surface; dense CO₂ atmosphere

Distance
108.2 M km
Rotation
243 Earth days
Moons
0
Radius
6,052 km

The brightest planet by far. Telescope users see crescent phases; binocular users still see a dazzling point.

Earth
03 / 08
Inner · Terrestrial

Earth

Only known world bearing life

Distance
149.6 M km
Rotation
23h 56m
Moons
1
Radius
6,371 km

We don’t need to teach you where to find it. We do recommend stepping outside and looking up at least once a week.

Mars
04 / 08
Inner · Terrestrial

Mars

Polar caps, Olympus Mons, dust storms

Distance
227.9 M km
Rotation
24h 37m
Moons
2
Radius
3,390 km

Opposition every 26 months brings the disc to ~25″. Otherwise: a small but unmistakable amber dot.

Jupiter
05 / 08
Outer · Gas Giant

Jupiter

Great Red Spot, banded cloud structure

Distance
778.5 M km
Rotation
9h 56m
Moons
95
Radius
69,911 km

Even a humble pair of binoculars resolves four Galilean moons — Io, Europa, Ganymede, Callisto.

Saturn
06 / 08
Outer · Gas Giant

Saturn

Iconic ring system spanning 282,000 km

Distance
1.43 B km
Rotation
10h 33m
Moons
146
Radius
58,232 km

The first time you see the rings through any telescope, you remember it for life. Bring a notebook.

Uranus
07 / 08
Outer · Ice Giant

Uranus

Rotates on its side (98° tilt)

Distance
2.87 B km
Rotation
17h 14m
Moons
27
Radius
25,362 km

Naked-eye visible from dark skies if you know exactly where to look. Most observers settle for binoculars.

Neptune
08 / 08
Outer · Ice Giant

Neptune

Fastest winds in the solar system

Distance
4.50 B km
Rotation
16h 06m
Moons
14
Radius
24,622 km

A tiny blue chip in any telescope. Worth tracking down once — for the surprise of seeing the farthest planet.

See them yourself.

Subscribe and we will send you a small ephemeris each lunation — what is visible, where to look, and how long you have to catch it.

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