🌌

The Messier Field Guide

All 110 objects in Charles Messier's catalogue, organized by the season they sit highest in the evening sky. What you'll actually see in binoculars or a 4-inch scope, plus imaging notes, sizes and difficulty for every one.

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🗺️Seasons at a glance
Organized by when each object is highest in the evening sky — jump to a season
WINTER
Dec — Feb
18
objects · 5 featured
SPRING
Mar — May
41
objects · 11 featured
SUMMER
Jun — Aug
38
objects · 13 featured
FALL
Sep — Nov
13
objects · 3 featured
Easy · naked eye / binoculars Moderate · small scope Challenging · 4–8″, dark skies Difficult · 8″+, very dark
🪶Charles Messier — the comet hunter who built the catalog
A "don't chase these" list that became the best beginner tour in the hobby

Charles Messier (1730–1817) was a French astronomer obsessed with one thing: finding comets. From a Paris rooftop with a small refractor he discovered thirteen — and earned the nickname "the comet ferret" from King Louis XV. But comets were easily confused with other fuzzy patches that didn't move: nebulae, clusters, and galaxies. So he wrote down every fixed fuzzy thing he ran into, purely to remember what not to chase next time.

The first entry, M1 (the Crab Nebula), made the list in 1758 because he'd briefly mistaken it for a returning Halley's Comet. By 1781 the list held 103 objects; later astronomers extended it to 110. In a delicious irony, Messier is now far better known for his "don't chase these" list than for any of his comets — it became, by accident, the gold-standard starter tour of the night sky, every object within reach of a small telescope or good binoculars.

Quick glossary

Magnitude — brightness; lower = brighter (naked-eye limit ~6). Arcminute (′) — angular size; the full Moon is ~30′. Globular vs open cluster — globulars are tight ancient balls of hundreds of thousands of stars (fuzzy snowballs); open clusters are loose young scatterings (jewelry). Hα / OIII — narrowband filters that cut light pollution and reveal nebula structure. Integration time — total stacked exposure; faint targets need hours.

⭐Your first five Messiers
Easy to find, unmistakable, and one is up any clear night of the year
M42 — Orion NebulaWINTER

The easiest. Find Orion's belt, drop to the sword — the middle "star" is M42, a fuzzy patch even to the naked eye. A small scope reveals the Trapezium stars and complex nebulosity.

M44 — Beehive ClusterSPRING

In Cancer, between Gemini and Leo. A fuzzy naked-eye spot in dark skies; binoculars resolve dozens of stars in a loose "swarm of bees." Too big for most telescope eyepieces.

M13 — Hercules ClusterSUMMER

The northern hemisphere's showpiece globular, between the two western stars of Hercules' Keystone. Binoculars show a fuzzy ball; a 6-inch resolves a glittering sphere of stars.

M27 — Dumbbell NebulaSUMMER

A bright planetary nebula in Vulpecula. The dumbbell shape is obvious in any 4-inch at modest magnification, with a greenish oxygen-emission tint.

M31 — Andromeda GalaxyFALL

Our nearest large neighbor — 2.5 million light-years away, naked-eye from any reasonably dark site. A 200mm camera lens captures the whole galaxy and its companions.

❄️ WinterDec — Feb · 18 objects
Dominated by Orion, Taurus, Auriga, and Gemini — cluster country, with the spectacular Orion Nebula complex as the centerpiece. Galaxies are rare here.
M1Crab Nebula★Challenging
Supernova Remnant · Taurus · mag 8.4 · 6′×4′
Visual: faint oval gray smudge near ζ Tau; structure needs 8″+ at high power.
Imaging: 1500–2000mm shows expanding filaments; narrowband reveals rich shock-front structure.
M34Easy
Open Cluster · Perseus · mag 5.5 · 35′
Visual: big naked-eye glow; lovely scattered stars in 7×50 binoculars.
Imaging: wide field 200mm or shorter; minimal exposure.
M35★Easy
Open Cluster · Gemini · mag 5.3 · 28′
Visual: naked-eye smudge; binoculars show 50+ stars; companion NGC 2158 nearby in 4″+.
Imaging: 300–500mm; capture NGC 2158 in the same frame.
M36Easy
Open Cluster · Auriga · mag 6.3 · 12′
Visual: compact; binoculars show ~20 stars; lovely in any small scope.
Imaging: good for 800mm+; minimal integration.
M37★Easy
Open Cluster · Auriga · mag 6.2 · 24′
Visual: richest of the Auriga trio — hundreds of stars in a 4″; striking orange central star.
Imaging: beautiful at any focal length; short subs avoid star bloat.
M38Starfish ClusterEasy
Open Cluster · Auriga · mag 7.4 · 21′
Visual: cross-shaped pattern; binoculars resolve outer members.
Imaging: pair with NGC 1907 in the same field.
M41Easy
Open Cluster · Canis Major · mag 4.5 · 38′
Visual: easy naked-eye south of Sirius; a binocular showcase.
Imaging: wide field 100–200mm; capture with Sirius for context.
M42Orion Nebula★Easy
Diffuse Nebula · Orion · mag 4.0 · 65′×60′
Visual: naked-eye fuzzy "star" in the sword; 4″ reveals the four Trapezium stars and complex nebulosity.
Imaging: iconic, beginner-friendly. 200–400mm frames it with M43. HDR essential — bright core, faint wings.
M43De Mairan's NebulaModerate
Diffuse Nebula · Orion · mag 9.0 · 20′×15′
Visual: northern lobe of M42; comma-shaped patch around a mag-7 star.
Imaging: always captured with M42; same processing.
M45Pleiades★Easy
Open Cluster · Taurus · mag 1.6 · 110′
Visual: naked-eye showpiece; binoculars reveal hundreds of stars and a hint of nebulosity.
Imaging: 135–300mm; long exposures bring out the blue reflection nebulae around Merope and Maia.
M46Moderate
Open Cluster · Puppis · mag 6.1 · 27′
Visual: rich field; the small planetary NGC 2438 is superimposed (6″+).
Imaging: pair with M47 in a wide field.
M47Easy
Open Cluster · Puppis · mag 4.4 · 30′
Visual: bright scattered cluster; naked-eye glow next to M46.
Imaging: pair with M46 at 200–400mm.
M48Easy
Open Cluster · Hydra · mag 5.8 · 54′
Visual: large scattered cluster; a binocular target.
Imaging: needs a wide field — 100–200mm.
M50Easy
Open Cluster · Monoceros · mag 5.9 · 16′
Visual: heart-shaped grouping; rewarding in a 4″ at low power.
Imaging: modest target between Sirius and Procyon.
M76Little DumbbellChallenging
Planetary Nebula · Perseus · mag 10.1 · 2.7′×1.8′
Visual: small bipolar planetary; needs 6″+ for the double-lobe shape.
Imaging: 1500mm+; narrowband shows beautiful structure.
M78Challenging
Reflection Nebula · Orion · mag 8.3 · 8′×6′
Visual: faint reflection nebula around two stars; needs dark skies and 6″+.
Imaging: notoriously tricky — wide dynamic range, reflection plus dark dust lanes.
M79Moderate
Globular Cluster · Lepus · mag 8.0 · 9.6′
Visual: compact southern globular; granular in a 4″.
Imaging: long focal length; a classic globular.
M93Easy
Open Cluster · Puppis · mag 6.2 · 22′
Visual: fan-shaped open cluster; pretty in any scope.
Imaging: wide field 200–400mm.
🌷 SpringMar — May · 41 objects
Galaxy season. The Virgo Cluster and Coma Berenices pack dozens of bright galaxies into a small patch of sky. Long focal lengths reward patience; dark skies are essential for the fainter members.
M3★Easy
Globular · Canes Venatici · mag 6.3 · 18′
Visual: bright globular; resolves into pinpoints in 6″+. A showpiece.
Imaging: 1000mm+; stacks well with short subs.
M40Winnecke 4Difficult
Double Star · Ursa Major · mag 8.4 · 0.8′
Visual: just two faint stars (Messier's recording mistake); included for completeness.
Imaging: a historical curiosity, not photographically interesting.
M44Beehive★Easy
Open Cluster · Cancer · mag 3.7 · 95′
Visual: naked-eye fuzz; binoculars dazzling — dozens of stars. Too big for most telescopes.
Imaging: 85–135mm lens essential to fit the whole cluster.
M49Moderate
Elliptical Galaxy · Virgo · mag 8.4 · 9′×7.5′
Visual: bright elliptical; smooth oval glow in a 4″.
Imaging: anchors a small group; 800–1200mm.
M51Whirlpool★Moderate
Spiral Galaxy · Canes Venatici · mag 8.4 · 11′×7′
Visual: two bright cores in a 4″; spiral arms in 8″+ from dark sites.
Imaging: stunning — sharp spiral with companion NGC 5195. 1000–2000mm; tidal bridge needs long integration.
M53Moderate
Globular · Coma Berenices · mag 7.6 · 13′
Visual: compact globular near Arcturus; granular in a 6″.
Imaging: pairs with NGC 5053 in a wider field.
M58Challenging
Spiral Galaxy · Virgo · mag 9.7 · 5.5′×4.5′
Visual: faint barred spiral; small oval glow in 6″+.
Imaging: part of the Virgo Cluster wide-field opportunity.
M59Challenging
Elliptical Galaxy · Virgo · mag 9.6 · 5′×3.5′
Visual: small elliptical; faint in a 6″.
Imaging: a tight pair with M60.
M60Moderate
Elliptical Galaxy · Virgo · mag 8.8 · 7′×6′
Visual: bright elliptical with faint spiral NGC 4647 superimposed.
Imaging: interesting interacting pair at 1500mm+.
M61Challenging
Spiral Galaxy · Virgo · mag 9.7 · 6′×5.5′
Visual: face-on barred spiral; faint round glow in an 8″.
Imaging: lovely structure at long focal lengths.
M63SunflowerModerate
Spiral Galaxy · Canes Venatici · mag 8.6 · 12′×8′
Visual: bright oval in a 6″; mottled hint of spiral arms.
Imaging: tight flocculent structure shines at 1500–2500mm.
M64Black Eye★Moderate
Spiral Galaxy · Coma Berenices · mag 8.5 · 9.3′×5.4′
Visual: bright tilted spiral; the dark dust lane visible in 6″+ near the nucleus.
Imaging: striking dust-lane reveal at 1500mm+ in good seeing.
M65★Moderate
Spiral Galaxy · Leo · mag 9.3 · 8′×2′
Visual: one of the Leo Triplet — edge-on; visible with M66 in the same eyepiece in 4″+.
Imaging: iconic triplet with M66 + NGC 3628 at 800–1200mm — best galaxy field of spring.
M66★Moderate
Spiral Galaxy · Leo · mag 8.9 · 9′×4′
Visual: one of the Leo Triplet — tilted spiral; brighter than M65.
Imaging: frame with M65 and NGC 3628 for the full triplet.
M67Easy
Open Cluster · Cancer · mag 6.1 · 30′
Visual: an older open cluster; rich and even, pretty in binoculars.
Imaging: standard cluster framing.
M68Moderate
Globular · Hydra · mag 7.8 · 12′
Visual: partial resolution in 6″+ at southern latitudes.
Imaging: standard globular if low altitude isn't an issue.
M81Bode's Galaxy★Easy
Spiral Galaxy · Ursa Major · mag 6.9 · 27′×14′
Visual: bright oval with stellar nucleus; visible in binoculars; spiral hints in an 8″.
Imaging: showcase pair with M82 at 400–800mm; integrated flux nebula appears in long exposures.
M82Cigar Galaxy★Easy
Starburst Galaxy · Ursa Major · mag 8.4 · 11′×4′
Visual: edge-on starburst; the cigar shape is obvious in any scope.
Imaging: pairs with M81; an Hα filter reveals the dramatic central outflow plumes.
M83Southern PinwheelModerate
Spiral Galaxy · Hydra · mag 7.5 · 12′×11′
Visual: face-on barred spiral; bright nucleus, hints of arms in 6″+ from southern sites.
Imaging: excellent if you can get low altitude — a beautiful spiral.
M84Moderate
Elliptical Galaxy · Virgo · mag 9.1 · 5′
Visual: bright elliptical; west end of Markarian's Chain.
Imaging: anchor of Markarian's Chain — a wide-field showcase at 600–900mm.
M85Moderate
Lenticular Galaxy · Coma Berenices · mag 9.1 · 7′×5′
Visual: bright lenticular; a smooth oval.
Imaging: Coma Cluster outskirts.
M86Moderate
Elliptical Galaxy · Virgo · mag 8.9 · 9′×6′
Visual: bright elliptical paired with M84.
Imaging: with M84 anchors Markarian's Chain — many NGC galaxies in one frame.
M87Virgo A★Moderate
Elliptical Galaxy · Virgo · mag 8.6 · 7′
Visual: round bright elliptical; the famous supermassive black hole host.
Imaging: long exposures show the iconic relativistic jet emerging from the core.
M88Challenging
Spiral Galaxy · Coma Berenices · mag 9.6 · 7′×4′
Visual: tilted spiral; soft elongated glow in a 6″.
Imaging: beautiful at 1500mm+.
M89Challenging
Elliptical Galaxy · Virgo · mag 9.8 · 5′
Visual: round elliptical; faint.
Imaging: part of a Virgo Cluster mosaic.
M90Challenging
Spiral Galaxy · Virgo · mag 9.5 · 9′×4′
Visual: edge-on tilted spiral; elongated glow in a 6″.
Imaging: photogenic at 1500mm+.
M91Challenging
Spiral Galaxy · Coma Berenices · mag 10.1 · 5′×4′
Visual: faint barred spiral; challenging visually.
Imaging: part of the Virgo Cluster region.
M94Easy
Spiral Galaxy · Canes Venatici · mag 8.2 · 11′×9′
Visual: bright compact spiral; an almost stellar nucleus.
Imaging: striking ring structure at long focal lengths.
M95Challenging
Spiral Galaxy · Leo · mag 9.7 · 4.4′×3.3′
Visual: faint barred spiral; round in a 6″.
Imaging: part of the Leo I group with M96/M105.
M96Moderate
Spiral Galaxy · Leo · mag 9.2 · 7′×5′
Visual: slightly elongated spiral; brighter than M95.
Imaging: group target with M95/M105.
M97Owl NebulaChallenging
Planetary Nebula · Ursa Major · mag 9.9 · 3.4′
Visual: round dim disk; the "owl eyes" need 10″+ and dark skies.
Imaging: narrowband (OIII) reveals the owl-eye structure beautifully.
M98Challenging
Spiral Galaxy · Coma Berenices · mag 10.1 · 9′×3′
Visual: edge-on spiral; a faint elongated streak.
Imaging: long focal length.
M99Challenging
Spiral Galaxy · Coma Berenices · mag 9.9 · 5′×4′
Visual: face-on spiral; a round soft glow.
Imaging: beautiful structure at long focal lengths.
M100Moderate
Spiral Galaxy · Coma Berenices · mag 9.3 · 7′×6′
Visual: brightest face-on spiral in Coma; small bright core in a 6″.
Imaging: a showcase grand-design spiral.
M101Pinwheel★Moderate
Spiral Galaxy · Ursa Major · mag 7.9 · 28′×27′
Visual: large face-on spiral; very low surface brightness — needs dark skies; arms in 8″+.
Imaging: stunning at 600–1000mm; rewards long integration; HII regions pop with Hα.
M102Spindle GalaxyChallenging
Lenticular Galaxy · Draco · mag 9.9 · 5.2′×2.3′
Visual: edge-on lenticular; a sliver shape in 8″+.
Imaging: the thin dust lane shows at long focal lengths.
M104Sombrero★Moderate
Spiral Galaxy · Virgo · mag 8.0 · 9′×4′
Visual: bright edge-on spiral; the dark dust lane visible in a 6″ from dark sites.
Imaging: iconic dust lane — high resolution rewarded; 1500mm+. One of the best edge-on spirals.
M105Moderate
Elliptical Galaxy · Leo · mag 9.3 · 5′×4′
Visual: bright elliptical; a trio with NGC 3384 and NGC 3389.
Imaging: group target with M95/M96.
M106Moderate
Spiral Galaxy · Canes Venatici · mag 8.4 · 19′×8′
Visual: tilted spiral; elongated bright nucleus; arms in 8″+.
Imaging: underrated — beautiful long-exposure target with extended Hα jets.
M108Challenging
Spiral Galaxy · Ursa Major · mag 10.0 · 9′×2′
Visual: edge-on spiral; a mottled streak in 6″+.
Imaging: pair with M97 in the same field at 600–800mm.
M109Challenging
Spiral Galaxy · Ursa Major · mag 9.8 · 7.6′×4.6′
Visual: faint barred spiral near Phecda; a round soft glow.
Imaging: long focal length.
☀️ SummerJun — Aug · 38 objects
Milky Way core season — the richest stretch of sky north of the equator. Sagittarius and Scorpius blaze with nebulae and globulars; Hercules and Cygnus add northern showpieces. The most rewarding season for visual observers.
M4★Easy
Globular · Scorpius · mag 5.9 · 26′
Visual: loose globular near Antares; a bar of stars across the center; resolved in a 4″.
Imaging: pair with the Antares region for one of the richest wide-field composites in the sky.
M5★Easy
Globular · Serpens · mag 5.6 · 23′
Visual: magnificent globular; resolves to the core in 6″+.
Imaging: a showcase globular at 1000mm+.
M6Butterfly ClusterEasy
Open Cluster · Scorpius · mag 4.2 · 25′
Visual: naked-eye glow; binoculars show the butterfly pattern.
Imaging: pair with M7 at 200–400mm.
M7Ptolemy Cluster★Easy
Open Cluster · Scorpius · mag 3.3 · 80′
Visual: bright naked-eye cluster (recorded by Ptolemy ~AD 130); a huge binocular target.
Imaging: 50–100mm lens; a rich Milky Way background.
M8Lagoon Nebula★Easy
Diffuse Nebula · Sagittarius · mag 6.0 · 90′×40′
Visual: naked-eye fuzz; 4″ reveals the dark Lagoon lane and embedded cluster.
Imaging: iconic Hα target; 300–600mm; pairs with M20 for the famous combined frame.
M9Moderate
Globular · Ophiuchus · mag 7.7 · 9.3′
Visual: compact globular; partial resolution in a 6″.
Imaging: standard globular.
M10Easy
Globular · Ophiuchus · mag 6.6 · 15′
Visual: bright globular; resolves outer members in a 6″.
Imaging: lovely at 1000mm; pairs nicely with M12.
M11Wild Duck Cluster★Easy
Open Cluster · Scutum · mag 6.3 · 13′
Visual: dense fan-shaped cluster, one of the richest; the "flying ducks" V pattern in 6″+.
Imaging: compact — long focal length OK; rich Milky Way background.
M12Easy
Globular · Ophiuchus · mag 6.7 · 14.5′
Visual: loose globular; pair with M10 at low power.
Imaging: pairs with M10 at 600mm.
M13Hercules Cluster★Easy
Globular · Hercules · mag 5.8 · 20′
Visual: the northern showpiece globular; fully resolves in 6″+; the "propeller" dark lanes pop in 10″+.
Imaging: easy resolved globular at 1000–1500mm; a classic beginner astrophotography target.
M14Moderate
Globular · Ophiuchus · mag 7.6 · 11′
Visual: compact globular; barely resolves in a 6″.
Imaging: standard globular.
M16Eagle Nebula★Moderate
Cluster + Nebula · Serpens · mag 6.0 · 35′×28′
Visual: bright cluster with surrounding nebulosity (the Pillars of Creation region) — needs dark skies for the nebula.
Imaging: the Pillars are the famous heart; narrowband Hα/SII/OIII for the SHO "Hubble palette."
M17Omega / Swan★Easy
Diffuse Nebula · Sagittarius · mag 7.0 · 11′
Visual: bright swan/checkmark shape; one of the brightest visual nebulae.
Imaging: Hα-rich; 600–1000mm; high contrast and easy to process.
M18Moderate
Open Cluster · Sagittarius · mag 7.5 · 9′
Visual: a sparse cluster between M17 and M24; modest.
Imaging: wide-field with M17/M24.
M19Moderate
Globular · Ophiuchus · mag 7.5 · 13.5′
Visual: elongated globular; faint at northern latitudes.
Imaging: standard globular.
M20Trifid Nebula★Moderate
Diffuse Nebula · Sagittarius · mag 6.3 · 28′
Visual: bright emission/reflection nebula; the trifurcating dark lanes need 6″+.
Imaging: stunning multi-color (red emission + blue reflection); 600–1000mm; pair with M8 in one frame.
M21Webb's CrossEasy
Open Cluster · Sagittarius · mag 6.5 · 13′
Visual: tight cluster next to M20; a binocular target.
Imaging: in the M8/M20 wide field.
M22Sagittarius Cluster★Easy
Globular · Sagittarius · mag 5.1 · 32′
Visual: the brightest globular for northern observers; rivals M13; resolves in a 4″.
Imaging: a showcase globular if you can get reasonable altitude.
M23Easy
Open Cluster · Sagittarius · mag 6.9 · 27′
Visual: rich open cluster; a binocular target.
Imaging: wide field.
M24Sagittarius Star Cloud★Easy
Star Cloud · Sagittarius · mag 4.6 · 90′
Visual: naked-eye Milky Way star cloud; a binocular extravaganza — hundreds of stars.
Imaging: 50–100mm; rich star fields with embedded dark nebulae.
M25Easy
Open Cluster · Sagittarius · mag 4.6 · 32′
Visual: bright scattered cluster; binoculars show many stars.
Imaging: wide field.
M26Moderate
Open Cluster · Scutum · mag 8.0 · 15′
Visual: compact cluster near M11; modest.
Imaging: wide field with M11.
M27Dumbbell Nebula★Easy
Planetary Nebula · Vulpecula · mag 7.4 · 8′
Visual: bright dumbbell shape, obvious in a 4″; one of the easiest planetaries.
Imaging: showpiece planetary; OIII bright; 800–1500mm; long OIII integration for the outer halo.
M28Moderate
Globular · Sagittarius · mag 6.8 · 11.2′
Visual: compact globular near M22; a small soft ball.
Imaging: pair with M22.
M29Moderate
Open Cluster · Cygnus · mag 6.6 · 7′
Visual: small cluster embedded in the Milky Way; a binocular target.
Imaging: rich background; modest at long focal lengths.
M39Easy
Open Cluster · Cygnus · mag 4.6 · 32′
Visual: bright loose open cluster; a binocular target.
Imaging: wide field.
M54Moderate
Globular · Sagittarius · mag 7.6 · 9.1′
Visual: compact globular (extragalactic — in the Sgr dwarf galaxy); not easily resolved.
Imaging: a distant globular — historical curiosity.
M55Moderate
Globular · Sagittarius · mag 6.3 · 19′
Visual: loose globular at low altitude; large and resolved in a 6″.
Imaging: standard globular if low altitude isn't an issue.
M56Moderate
Globular · Lyra · mag 8.3 · 7.1′
Visual: compact globular between Albireo and the Ring; partial resolution in an 8″.
Imaging: standard globular.
M57Ring Nebula★Easy
Planetary Nebula · Lyra · mag 8.8 · 1.4′
Visual: a tiny smoke ring, obvious in 4″+; one of the most rewarding planetaries.
Imaging: small — 2000mm+; the central star shows in long Hα exposures.
M62Easy
Globular · Ophiuchus · mag 6.4 · 15′
Visual: bright globular; one of the brightest in Ophiuchus.
Imaging: standard globular.
M69Moderate
Globular · Sagittarius · mag 7.6 · 7.1′
Visual: small dense globular; faint at northern latitudes.
Imaging: standard globular at low altitude.
M70Moderate
Globular · Sagittarius · mag 7.9 · 8′
Visual: compact globular near M69; faint in the south.
Imaging: pair with M69.
M71Easy
Globular · Sagitta · mag 8.0 · 7.2′
Visual: loose globular (long debated as open); an unusual character; a binocular target.
Imaging: pretty in a rich Milky Way background.
M75Moderate
Globular · Sagittarius · mag 8.5 · 6.8′
Visual: distant compact globular; a soft round glow.
Imaging: standard globular.
M80Moderate
Globular · Scorpius · mag 7.3 · 8.9′
Visual: compact globular near Antares; a soft ball.
Imaging: in the rich Antares-region wide field.
M92Easy
Globular · Hercules · mag 6.4 · 14′
Visual: bright globular often overshadowed by M13; resolves well in a 6″.
Imaging: often paired with M13 photographically.
M107Moderate
Globular · Ophiuchus · mag 7.9 · 10′
Visual: faint globular; modest in a 4″.
Imaging: standard globular.
🍂 FallSep — Nov · 13 objects
Andromeda season. The naked-eye Andromeda Galaxy and its companions dominate, joined by the magnificent globular M15 and the elusive Triangulum Galaxy. A quieter section — but with the most spectacular galaxy in the catalog.
M2Easy
Globular · Aquarius · mag 6.5 · 13′
Visual: bright globular near the celestial equator; resolved in a 6″.
Imaging: standard globular.
M15Pegasus Cluster★Easy
Globular · Pegasus · mag 6.2 · 18′
Visual: compact bright globular near Enif; a very dense core; partial resolution in 6″+.
Imaging: showpiece globular; the planetary nebula Pease 1 hides inside (long focal length, careful exposure).
M30Easy
Globular · Capricornus · mag 7.2 · 11′
Visual: compact globular; a soft ball in a 4″.
Imaging: standard globular at low altitude.
M31Andromeda Galaxy★Easy
Spiral Galaxy · Andromeda · mag 3.4 · 178′×63′
Visual: naked-eye smudge from any dark site; binoculars show the oval core; companions M32 and M110 visible.
Imaging: massive — 50–135mm; long integration shows the full halo and dust lanes; mosaic for full resolution.
M32Easy
Elliptical Galaxy · Andromeda · mag 8.1 · 8′×6′
Visual: compact elliptical companion to M31; a round bright glow.
Imaging: always in the M31 frame.
M33Triangulum Galaxy★Moderate
Spiral Galaxy · Triangulum · mag 5.7 · 71′×42′
Visual: large face-on spiral; deceptively faint (low surface brightness); a binocular target from dark sites.
Imaging: stunning at 300–500mm; arms full of HII regions with an Hα filter.
M52Easy
Open Cluster · Cassiopeia · mag 7.3 · 13′
Visual: rich open cluster.
Imaging: pair with the Bubble Nebula (NGC 7635) at 800mm+ for a stunning composition.
M72Challenging
Globular · Aquarius · mag 9.4 · 6.6′
Visual: faint distant globular; a small disk in 6″+.
Imaging: standard globular.
M73Difficult
Asterism · Aquarius · mag 9.0 · 1.4′
Visual: just an asterism of 4 stars (Messier's mistake); easy in any scope.
Imaging: not photographically interesting.
M74Phantom GalaxyChallenging
Spiral Galaxy · Pisces · mag 9.4 · 10′×9′
Visual: notoriously low surface brightness face-on spiral; needs dark skies and 8″+.
Imaging: beautiful flocculent spiral at long focal lengths; rewards integration time.
M77Cetus AModerate
Spiral Galaxy · Cetus · mag 8.9 · 7′×6′
Visual: bright Seyfert galaxy; a small bright nucleus easily seen.
Imaging: active core; long focal length.
M103Easy
Open Cluster · Cassiopeia · mag 7.4 · 6′
Visual: compact triangular open cluster; rewarding in small scopes.
Imaging: a tight target.
M110Moderate
Elliptical Galaxy · Andromeda · mag 8.5 · 17′×10′
Visual: elongated elliptical companion to M31; a subtle glow in 4″+.
Imaging: always in the M31 frame — the "other" companion.
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