Cloudy Nights'
Monthly Challenge Objects - 2025
Observing guides for Cloudy Nights' Monthly Challenge Objects in the year 2025.
Use the button(s) to download the objects of the month in the image orientation of your choice, click the object's name to visit the corresponding page on the Cloudy Nights forum. Please read Downloading CSOG and iPad Astronomy.
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January - February-1 - February-2 - March - April - May - June - July - August - September - October - November
Registration is not required to download the current Objects of the Month
Cloudy Nights' Monthly Challenge Objects
An index file, AstroPlanner planfile and Tour files by constellation and object category for all Cloudy Nights' Monthly Challenge Objects posted since November 2023.
These downloads will be updated periodically.
Updated: 8 November 2025
Index files: 1
AstroPlanner planfiles: 1
Autostar Tours / NexTours / EQTours: 55
Argo Navis User Catalogs: 56
Observing guides for the current year can be downloaded below. Observing guides for preceding years can be downloaded on the respective pages:
November
Click here to review the CSOG image orientations
Open cluster and emission nebula NGC1624 in Perseus
This object is included in CSOG's:
8-10" & 12-14" Constellation editions
Herschel edition
Hubble Nebulae edition
Cederblad Nebulae edition
Gaze-Shajn Nebulae edition
Sharpless Nebulae edition
Collinder Star Clusters edition
Burnham's Celestial Handbook - DSO's edition
Herschel II observing program
Deep Sky Forum's Objects of the Week 2020 - Week 46
Webb Deep-Sky Society's Objects of the Month 2021 - December 2021
This object is included in CSOG's:
Galaxy pair Arp 290 (IC195 & IC196) in Aries
This object is included in CSOG's:
12-14" Constellation edition
Arp Peculiar Galaxies edition
Karachentsev Northern Isolated Pairs of Galaxies (KPG) edition
October
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Galaxy MCG-04-53-039 in Aquarius
September
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Globular cluster NGC6749 in Aquila
Emission nebula Apriamaswili 2-1 in Aquila
Planetary nebula Hartl, Dengel, Weinberger 11 in Aquila
August
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Wolf-Rayet shell Wolf-Rayet 134 in Cygnus
Galaxy MCG-01-43-002 in Ophiuchus
Planetary nebula Abell 69 in Cygnus
July
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Globular cluster Messier 4 (NGC6121- Lacaille I.9) - the "Cat's Eye" in Scorpius
Globular cluster Haute-Provence Observatory 1 in Ophiuchus
Planetary nebula Hubble 5 - "Hubble's Double Bubble" in Sagittarius
Galaxy PGC62946 - "the Bird" in Sagittarius
June
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Galaxy NGC4861 (Arp 266) with HII region PGC93120 (Markarian 59) in Canes Venatici
Galaxy pair NGC5846 & NGC5846A (Holmberg 694) in Virgo
Galaxy MCG+00-39-011 in Serpens (Caput)
May
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Planetary nebula Abell 36 - the "Bat Symbol Nebula" in Virgo
Galaxy group PGC84569, PGC4530597 & PGC3845255 in Boötes
April
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Planetary nebula NGC3242 - the "Ghost of Jupiter" and nebulosity in the constellation of Hydra
March
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Galaxy IC2574 - "Coddington's Nebula" in Ursa Major
Galaxy NGC3003 - the "Little Whale Galaxy" in Leo Minor
Galaxy pair KPG 216 in Sextans
February - 2
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Open cluster Melotte 25 - "the Hyades" in Taurus
Galaxy cluster Abell 754 in Hydra
February - 1
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Galaxy pair Vorontsov-Vel'yaminov 528 (MCG+06-17-002 & PGC200234) in Gemini
January
Click here to review the CSOG image orientations
Unmirrored
MH
MV
MHV
Open cluster Collinder 70 - "Orion's Belt" in Orion
Reflection nebula Sazhen 30 in Orion
Galaxy Abell 11 (2MASX J05372154+0815290) in Orion
