How Many Subs

What to image in July with the ZWO Seestar S50 Pro

The Milky Way core is up after midnight: the Lagoon, Trifid, Eagle and Swan nebulae, low in the south from Britain and northern Europe but spectacular from the southern US and the southern hemisphere. Cygnus and the Veil are high by the small hours. Dual-band filter on for all of them.

Moon in July 2027: new on 4 Jul, full on 18 Jul. Broadband targets (galaxies, clusters) want the week either side of new; emission nebulae behind a dual-band filter tolerate the rest.

59 targets transit near midnight in July. From a suburban sky the Seestar S50 Pro gets a solid image of 42 of them in under an hour each; 17 need longer, or a darker sky, or several nights. Times below use the recommended filter and 10 s subs.

Solid image with the ZWO Seestar S50 Pro, sorted by the Bortle 6 figure. Each link opens the full Bortle 1 to 9 table with sub-length and filter comparisons.
TargetTypeBortle 4Bortle 6Bortle 8
Butterfly ClusterScorpiusOpen cluster5 min30 subs5 min30 subs6 min37 subs
Ptolemy's ClusterScorpiusOpen cluster5 min30 subs5 min30 subs6 min37 subs
Wild Duck ClusterScutumOpen cluster5 min30 subs5 min30 subs6 min39 subs
M18SagittariusOpen cluster5 min30 subs5 min30 subs10 min61 subs
M21SagittariusOpen cluster5 min30 subs5 min30 subs7 min42 subs
M23SagittariusOpen cluster5 min30 subs5 min30 subs6 min37 subs
M25SagittariusOpen cluster5 min30 subs5 min30 subs6 min37 subs
M26ScutumOpen cluster5 min30 subs5 min30 subs6 min37 subs
M39CygnusOpen cluster5 min30 subs5 min30 subs6 min37 subs
M29CygnusOpen cluster5 min30 subs6 min37 subs13 min78 subs
NGC 6939CepheusOpen cluster5 min30 subs6 min37 subs13 min78 subs
M92HerculesGlobular cluster5 min30 subs7 min40 subs15 min92 subs
M28SagittariusGlobular cluster5 min30 subs7 min42 subs16 min95 subs
Ring NebulaLyra, dual-bandPlanetary nebula7 min41 subs8 min46 subs11 min65 subs
Hercules ClusterHerculesGlobular cluster5 min30 subs8 min48 subs19 min116 subs
M62OphiuchusGlobular cluster5 min32 subs9 min55 subs22 min133 subs
Sagittarius Star CloudSagittariusStar cloud6 min34 subs10 min58 subs24 min142 subs
M15PegasusGlobular cluster6 min37 subs11 min64 subs26 min157 subs
M2AquariusGlobular cluster6 min39 subs11 min68 subs28 min169 subs
Cat's Eye NebulaDraco, dual-bandPlanetary nebula10 min59 subs11 min69 subs17 min102 subs
Turtle NebulaHercules, dual-bandPlanetary nebula10 min59 subs11 min69 subs17 min102 subs
Blinking PlanetaryCygnus, dual-bandPlanetary nebula10 min59 subs11 min69 subs17 min102 subs
Saturn NebulaAquarius, dual-bandPlanetary nebula10 min59 subs11 min69 subs17 min102 subs
M80ScorpiusGlobular cluster7 min43 subs12 min72 subs29 min173 subs
M30CapricornusGlobular cluster7 min45 subs13 min78 subs31 min189 subs
M22SagittariusGlobular cluster8 min46 subs13 min81 subs34 min204 subs
M55SagittariusGlobular cluster8 min51 subs15 min91 subs38 min229 subs
M12OphiuchusGlobular cluster9 min53 subs16 min95 subs40 min241 subs
M70SagittariusGlobular cluster10 min63 subs18 min108 subs44 min264 subs
M69SagittariusGlobular cluster10 min63 subs18 min111 subs46 min275 subs
M75SagittariusGlobular cluster12 min73 subs21 min124 subs50 min303 subs
M71SagittaGlobular cluster12 min73 subs21 min125 subs51 min307 subs
Lagoon NebulaSagittarius, dual-bandEmission nebula17 min105 subs22 min132 subs37 min225 subs
Dumbbell NebulaVulpecula, dual-bandPlanetary nebula18 min110 subs22 min134 subs36 min218 subs
M19OphiuchusGlobular cluster12 min75 subs23 min139 subs1 h363 subs
M14OphiuchusGlobular cluster13 min81 subs25 min149 subs1 h 04 min382 subs
Omega NebulaSagittarius, dual-bandEmission nebula20 min123 subs26 min154 subs43 min260 subs
M10OphiuchusGlobular cluster16 min95 subs30 min180 subs1 h 19 min476 subs
M54SagittariusGlobular cluster17 min100 subs31 min187 subs1 h 22 min490 subs
M9OphiuchusGlobular cluster19 min117 subs37 min222 subs1 h 38 min586 subs
M56LyraGlobular cluster23 min141 subs44 min267 subs1 h 57 min700 subs
Trifid NebulaSagittarius, dual-bandEmission nebula38 min227 subs49 min294 subs1 h 28 min529 subs
M107OphiuchusGlobular cluster33 min196 subs1 h 05 min389 subs2 h 56 min1,058 subs
Eagle NebulaSerpens, dual-bandEmission nebula52 min312 subs1 h 08 min410 subs2 h 05 min749 subs
M72AquariusGlobular cluster40 min243 subs1 h 18 min469 subs3 h 28 min1,249 subs
M4ScorpiusGlobular cluster40 min240 subs1 h 21 min488 subs3 h 44 min1,344 subs
Eastern Veil NebulaCygnus, dual-bandSupernova remnant1 h 06 min398 subs1 h 28 min528 subs2 h 42 min975 subs
North America NebulaCygnus, dual-bandEmission nebula1 h 12 min433 subs1 h 36 min574 subs2 h 57 min1,065 subs
Western Veil NebulaCygnus, dual-bandSupernova remnant1 h 18 min470 subs1 h 44 min625 subs3 h 14 min1,163 subs
Iris NebulaCepheusReflection nebula1 h360 subs2 h 04 min745 subs5 h 46 min2,077 subs
Pelican NebulaCygnus, dual-bandEmission nebula1 h 40 min603 subs2 h 15 min808 subs4 h 13 min1,517 subs
Elephant's Trunk NebulaCepheus, dual-bandEmission nebula1 h 59 min713 subs2 h 40 min960 subs5 h 02 min1,812 subs
Tulip NebulaCygnus, dual-bandEmission nebula1 h 59 min713 subs2 h 40 min960 subs5 h 02 min1,812 subs
NGC 6781Aquila, dual-bandPlanetary nebula2 h 17 min825 subs3 h 02 min1,091 subs5 h 35 min2,008 subs
Crescent NebulaCygnus, dual-bandEmission nebula2 h 21 min845 subs3 h 10 min1,141 subs6 h 01 min2,166 subs
Cocoon NebulaCygnus, dual-bandEmission nebula2 h 29 min892 subs3 h 20 min1,200 subs6 h 17 min2,265 subs
Fireworks GalaxyCygnusGalaxy2 h 42 min973 subs5 h 45 min2,071 subs16 h5,866 subs
NGC 6914CygnusReflection nebula3 h 09 min1,137 subs6 h 38 min2,390 subs19 h6,722 subs
Abell 39Hercules, dual-bandPlanetary nebula18 h6,394 subs24 h8,815 subs48 h17,181 subs

Other telescopes in July: Seestar S50 · Seestar S30 · Seestar S30 Pro · DWARF 3 · DWARF mini · Draco · DWARF II · Vespera II · Vespera Pro · Vespera 3 · Vespera Pro 2 · eQuinox 2 · Odyssey · Origin · Origin Mark II

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