Webb Deep-Sky Society's Objects of the Month - 2021

Webb Deep-Sky Society's
Objects of the Month - 2021

Observing guides for the Webb Deep-Sky Society's galaxy, nebula, star cluster and double stars of the month in the year 2021.
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 Webb-site. Please read Downloading CSOG and iPad Astronomy.

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Download - 2021

All the Webb Deep-Sky Society's Objects of the Month for the year 2021.

Updated: 22 September 2025

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Observing guides (pages): 65 (143)
Index files: 1
AstroPlanner planfiles: 1

10 open clusters
3 globular clusters
2 nebulae
10 planetary nebulae
11 galaxies & galaxy groups
1 galaxy cluster
2 asterisms
26 double stars

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January 2021

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Galaxy of the Month

Galaxy group Holmberg 124 in Ursa Major

Star Clusters of the Month

Open cluster IC2157 in Gemini

Open cluster IC2156 in Gemini

Open cluster NGC2158 in Gemini

Open cluster Messier 35 (NGC2168) in Gemini

Nebula of the Month

Reflection nebula NGC2261 - "Hubble's Variable Nebula" in Monoceros

Double Stars of the Month

32 Orionis (STF728 - WDS05308+0557) in Orion

"Mintaka" - Delta Orionis (STFA14 - WDS05320-0018) in Orion

February 2021

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Galaxy of the Month

Galaxy group WBL 142 in Gemini

Star Cluster of the Month

Asterism NGC2678 in Cancer

Nebula of the Month

Planetary nebula NGC2610 in Hydra

Double Stars of the Month

Phi-2 Cancri (STF1223 - WDS08268+2656) in Cancer

Upsilon Cancri (STF1224 - WDS08267+2432) in Cancer

Pi Puppis (Dunlop 43 - WDS07171-3706) in Puppis

March 2021

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Galaxy of the Month

Galaxy group Arp 307 in Leo

Star Cluster of the Month

Asterism NGC3231 in Ursa Major

Nebula of the Month

Planetary nebula NGC3242 - the "Ghost of Jupiter" in Hydra

Double Stars of the Month

STF1426 (WDS10205+0626) in Leo

Burnham 208 (WDS08391-2240) in Pyxis

April 2021

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Galaxy of the Month

Galaxy pair NGC3636 & NGC3637 in Crater

Star Cluster of the Month

Globular cluster Messier 3 (NGC5272) in Canes Venatici

Nebula of the Month

Planetary nebula IC3568 - the "Lemon Slice Nebula" in Camelopardalis

Double Stars of the Month

35 Sextantis (STF1466 - WDS10433+0445) in Sextant

Cape Observatory 12 (WDS12283-6146) in Crux

May 2021

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Galaxy of the Month

Galaxy group Arp 286 in Virgo

Star Cluster of the Month

Globular cluster NGC5634 in Virgo

Nebula of the Month

Planetary nebula NGC6058 in Hercules

Double Stars of the Month

1 Boötis (STF1772 - WDS13407+1957) in Boötes

"Rigil Kentaurus, Toliman & Proxima Centauri" (Alpha Centauri - Richaud 1 - WDS14396-6050) in Centaurus

June 2021

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Galaxy of the Month

Galaxy NGC5899 in Boötis

Star Cluster of the Month

Globular cluster Messier 107 (NGC6171) in Ophiuchus

Nebula of the Month

Planetary nebula NGC6210 - the "Turtle Planetary Nebula" in Hercules

Double Stars of the Month

STF1972 (WDS15292+8027) in Ursa Minor

Herschel VI 51 (WDS14576-0010) in Virgo

Burnham 348 (WDS15018-0008) in Virgo

July 2021

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Galaxy of the Month

Galaxy NGC6487 in Hercules

Star Cluster of the Month

Open cluster NGC6633 - the "Wasp-Waist Cluster" in Ophiuchus

Nebula of the Month

Planetary nebula NGC6742 in Draco

Double Stars of the Month

STF2244 (WDS17571+0004) in Ophiuchus

Kappa-2 Coronae Australis (Dunlop 222 - WDS18334-3844) in Coronae Australis

August 2021

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Galaxy of the Month

Galaxy pair NGC6658 & NGC6661 in Hercules

Star Cluster of the Month

Open cluster NGC6940 - the "Mothra Cluster" in Vulpecula

Nebula of the Month

Planetary nebula NGC7008 - the "Fetus Nebula" in Cygnus

Double Stars of the Month

STT358 (WDS18359+1659) in Hercules

"Arkab Prior" - Beta-1 Sagittarii (Dunlop 226 - WDS19226-4428) in Sagittarius

September 2021

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Galaxy of the Month

Galaxy group Holmberg 802 in Pegasus

Star Cluster of the Month

Open cluster Mayer 1 & emission nebula Simeis 21 in Cassiopeia

Nebula of the Month

Planetary nebula NGC7354 in Cepheus

Double Stars of the Month

STF2883 (WDS22106+7008) in Cepheus

Harvard 298 (WDS22183-5338) in Grus

October 2021

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Galaxy of the Month

Galaxies NGC870, NGC871, NGC876 & NGC877 in Aries

Star Cluster of the Month

Open clusters NGC133, NGC146 & King 14 in Cassiopeia

Nebula of the Month

Planetary nebula NGC246, the "Skull Nebula" in Cetus

Double Stars of the Month

STF3053 (WDS00026+6606) in Cassiopeia

STF3008 (WDS23238-0828) in Aquarius

November 2021

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Galaxy of the Month

Galaxy cluster Abell 347 in Andromeda

Star Cluster of the Month

Open cluster NGC1245 - the "Patrick Starfish Cluster" in Perseus

Nebula of the Month

Planetary nebula IC2003 in Perseus

Double Stars of the Month

Phi Andromedae - STT515 (WDS01095+4715) in Andromeda

66 Ceti - STF231 (WDS02128-0224) in Cetus

December 2021

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Galaxy of the Month

Galaxy NGC1723 in Eridanus

Star Cluster of the Month

Open cluster and emission nebula NGC1624 in Perseus

Nebula of the Month

Emission nebula NGC1579 - the "Northern Trifid Nebula" in Perseus

Double Stars of the Month

STT65 (WDS03503+2535) in Taurus

Dunlop 15 (WDS03398-4022) in Eridanus

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