How Many Subs

What to image in July with the ZWO Seestar S30 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 S30 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 S30 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 min39 subs
Ptolemy's ClusterScorpiusOpen cluster5 min30 subs5 min30 subs6 min39 subs
Wild Duck ClusterScutumOpen cluster5 min30 subs5 min30 subs7 min41 subs
M18SagittariusOpen cluster5 min30 subs5 min30 subs11 min64 subs
M21SagittariusOpen cluster5 min30 subs5 min30 subs7 min44 subs
M23SagittariusOpen cluster5 min30 subs5 min30 subs6 min39 subs
M25SagittariusOpen cluster5 min30 subs5 min30 subs6 min39 subs
M26ScutumOpen cluster5 min30 subs5 min30 subs6 min39 subs
M39CygnusOpen cluster5 min30 subs5 min30 subs6 min39 subs
M29CygnusOpen cluster5 min30 subs6 min39 subs14 min82 subs
NGC 6939CepheusOpen cluster5 min30 subs6 min39 subs14 min82 subs
M92HerculesGlobular cluster5 min30 subs7 min42 subs16 min97 subs
M28SagittariusGlobular cluster5 min30 subs7 min44 subs17 min100 subs
Ring NebulaLyra, dual-bandPlanetary nebula7 min43 subs8 min49 subs11 min69 subs
Hercules ClusterHerculesGlobular cluster5 min31 subs8 min51 subs20 min123 subs
M62OphiuchusGlobular cluster6 min34 subs10 min58 subs23 min140 subs
Sagittarius Star CloudSagittariusStar cloud6 min36 subs10 min62 subs25 min150 subs
M15PegasusGlobular cluster6 min39 subs11 min67 subs27 min165 subs
M2AquariusGlobular cluster7 min42 subs12 min72 subs30 min178 subs
Cat's Eye NebulaDraco, dual-bandPlanetary nebula10 min63 subs12 min73 subs18 min108 subs
Turtle NebulaHercules, dual-bandPlanetary nebula10 min63 subs12 min73 subs18 min108 subs
Blinking PlanetaryCygnus, dual-bandPlanetary nebula10 min63 subs12 min73 subs18 min108 subs
Saturn NebulaAquarius, dual-bandPlanetary nebula10 min63 subs12 min73 subs18 min108 subs
M80ScorpiusGlobular cluster7 min45 subs13 min76 subs30 min182 subs
M30CapricornusGlobular cluster8 min48 subs14 min82 subs33 min199 subs
M22SagittariusGlobular cluster8 min49 subs14 min86 subs36 min215 subs
M55SagittariusGlobular cluster9 min54 subs16 min96 subs40 min242 subs
M12OphiuchusGlobular cluster9 min56 subs17 min100 subs42 min254 subs
M70SagittariusGlobular cluster11 min67 subs19 min114 subs46 min278 subs
M69SagittariusGlobular cluster11 min67 subs19 min117 subs48 min290 subs
M75SagittariusGlobular cluster13 min77 subs22 min132 subs53 min319 subs
M71SagittaGlobular cluster13 min77 subs22 min132 subs54 min323 subs
Lagoon NebulaSagittarius, dual-bandEmission nebula19 min113 subs24 min142 subs40 min240 subs
Dumbbell NebulaVulpecula, dual-bandPlanetary nebula20 min118 subs24 min144 subs39 min232 subs
M19OphiuchusGlobular cluster13 min80 subs25 min148 subs1 h 04 min383 subs
M14OphiuchusGlobular cluster14 min87 subs26 min158 subs1 h 07 min403 subs
Omega NebulaSagittarius, dual-bandEmission nebula22 min133 subs27 min165 subs46 min277 subs
M10OphiuchusGlobular cluster17 min101 subs32 min191 subs1 h 24 min502 subs
M54SagittariusGlobular cluster18 min106 subs33 min198 subs1 h 26 min517 subs
M9OphiuchusGlobular cluster21 min124 subs39 min235 subs1 h 43 min618 subs
M56LyraGlobular cluster25 min151 subs47 min283 subs2 h 03 min738 subs
Trifid NebulaSagittarius, dual-bandEmission nebula41 min245 subs53 min317 subs1 h 34 min564 subs
M107OphiuchusGlobular cluster35 min209 subs1 h 09 min412 subs3 h 06 min1,116 subs
Eagle NebulaSerpens, dual-bandEmission nebula56 min338 subs1 h 14 min442 subs2 h 13 min798 subs
M72AquariusGlobular cluster43 min259 subs1 h 23 min497 subs3 h 39 min1,317 subs
M4ScorpiusGlobular cluster43 min257 subs1 h 26 min517 subs3 h 56 min1,418 subs
Eastern Veil NebulaCygnus, dual-bandSupernova remnant1 h 12 min433 subs1 h 35 min569 subs2 h 53 min1,039 subs
North America NebulaCygnus, dual-bandEmission nebula1 h 18 min470 subs1 h 43 min619 subs3 h 09 min1,135 subs
Western Veil NebulaCygnus, dual-bandSupernova remnant1 h 25 min510 subs1 h 52 min674 subs3 h 26 min1,239 subs
Iris NebulaCepheusReflection nebula1 h 04 min384 subs2 h 12 min790 subs6 h 05 min2,191 subs
Pelican NebulaCygnus, dual-bandEmission nebula1 h 49 min656 subs2 h 25 min872 subs4 h 29 min1,617 subs
Elephant's Trunk NebulaCepheus, dual-bandEmission nebula2 h 09 min776 subs2 h 53 min1,036 subs5 h 22 min1,932 subs
Tulip NebulaCygnus, dual-bandEmission nebula2 h 09 min776 subs2 h 53 min1,036 subs5 h 22 min1,932 subs
NGC 6781Aquila, dual-bandPlanetary nebula2 h 29 min896 subs3 h 16 min1,175 subs5 h 57 min2,140 subs
Crescent NebulaCygnus, dual-bandEmission nebula2 h 33 min920 subs3 h 25 min1,232 subs6 h 25 min2,309 subs
Cocoon NebulaCygnus, dual-bandEmission nebula2 h 42 min970 subs3 h 36 min1,294 subs6 h 42 min2,414 subs
Fireworks GalaxyCygnusGalaxy2 h 53 min1,041 subs6 h 06 min2,196 subs17 h6,188 subs
NGC 6914CygnusReflection nebula3 h 23 min1,216 subs7 h 02 min2,534 subs20 h7,091 subs
Abell 39Hercules, dual-bandPlanetary nebula19 h6,979 subs26 h9,526 subs51 h18,327 subs

Other telescopes in July: Seestar S50 · Seestar S50 Pro · Seestar S30 · 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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