The telescope aperture classes for the constellation editions are a rule of thumb. If, for example, you have an 8" or larger telescope but observing conditions are less than optimal, you may want to use the 5-6" edition instead. If you have a 5-6" scope and like a challenge, the 8-10" edition will provide plenty.
Click the Index button to download only an edition's index pdf, click the Planfile & Tours button to download only the AstroPlanner planfile(s) and tours. Use the green download button(s) to download a complete edition in the image orientation of your choice.
Please read Downloading CSOG, the CSOG Release Notes and the article iPad Astronomy.
5-6" Telescopes - 8-10" Telescopes - 12-14" Telescopes
5-6" Telescopes
2439 Objects within reach of telescopes of 5 to 6 inches in aperture.
All objects in the Messier, Dunlop and Lacaille catalogs are included.
Updated: 22 September 2025 - V3.0.1
Observing guides (pages): 389 (1196)
Index files: 97
AstroPlanner planfiles: 91
Autostar Tours / NexTours / EQTours: 402
Argo Navis User Catalogs: 490
Downloads
- 1 of 2: Andromeda through Horologium
- 2 of 2: Hydra through Vulpecula
229 carbon stars
745 open clusters
161 globular clusters
231 nebulae
175 dark nebulae
106 planetary nebulae
16 supernova remnants
695 galaxies and galaxy groups
76 asterisms
5 other
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
8-10" Telescopes
4580 Objects within reach of telescopes of 8 to 10 inches in aperture.
All objects in the 5-6" edition are included, along with all objects in the Herschel 400, Herschel II and Herschel 3 lists and all objects in Burnham's Celestial Handbook.
Updated: 22 September 2025 - V3.0.1
Observing guides (pages): 500 (2040)
Index files: 102
AstroPlanner planfiles: 91
Autostar Tours / NexTours / EQTours: 499
Argo Navis User Catalogs: 587
Downloads
- 1 of 3: Andromeda through Cygnus
- 2 of 3: Delphinus through Pavo
- 3 of 3: Pegasus through Vulpecula
350 carbon stars
1357 open clusters
193 globular clusters
340 nebulae
204 dark nebulae
191 planetary nebulae
23 supernova remnants
1786 galaxies and galaxy groups
102 asterisms
34 other
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
12-14" Telescopes
15529 Objects for telescopes of 12 to 14 inches in aperture, or larger.
All objects in the 8-10" edition are included, along with all Herschel objects and thousands more.
Updated: 22 September 2025 - V3.0.1
Observing guides (pages): 873 (6044)
Index files: 106
AstroPlanner planfiles: 92
Autostar Tours / NexTours / EQTours: 871
Argo Navis User Catalogs: 960
Downloads
- 1 of 8: Andromeda through Canes Venatici
- 2 of 8: Canis Major through Columba
- 3 of 8: Coma Berenices through Gemini
- 4 of 8: Dorado through Horologium
- 5 of 8: Hydra through Mensa
- 6 of 8: Microscopium through Piscis Austrinus
- 7 of 8: Puppis through Triangulum
- 8 of 8: Triangulum Australe through Vulpecula
866 carbon stars
3654 open clusters (1552 excluding the constellations of Dorado & Mensa)
238 globular clusters
735 nebulae
214 dark nebulae
545 planetary nebulae
71 supernova remnants
8943 galaxies and galaxy groups
129 asterisms
134 other
Click here to review the CSOG image orientations