Another project to capture as many Caldwell objects as possible. Many of the later ones (60+) are southern hemisphere objects so it is unlikely I will get them here – at least not without some travel.
“The Caldwell Catalogue is an astronomical catalog of 109 bright star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Sir Patrick Caldwell-Moore, better known as Patrick Moore, as a complement to the Messier Catalogue.”
| C# | NGC/IC | Con. | Type | Mag. | Size () | Description |
| 1 | 188 | Cep | OC | 8.1 | 14 | |
| 2 | 40 | Cep | PN | 11.6 | 0.6 | |
| 3 | 4236 | Dra | SbG | 9.7 | 21 x 7 | |
| 4 | 7023 | Cep | BN | 6.8 | 18 x 18 | Reflection Nebula |
| 5 | IC 342 | Cam | SBcG | 9.2 | 18 x 17 | |
| 6 | 6543 | Dra | PN | 8.8 | 0.3/5.8 | Cat’s Eye Nebula |
| 7 | 2403 | Cam | ScG | 8.9 | 18 x 10 | |
| 8 | 559 | Cas | OC | 9.5 | 4 | |
| 9 | Sh2-155 | Cep | BN | 7.7 | 50 x 10 | Cave Nebula |
| 10 | 663 | Cas | OC | 7.1 | 16 | |
| 11 | 7635 | Cas | BN | 7.0 | 15 x 8 | Bubble Nebula |
| 12 | 6946 | Cep | ScG | 9.7 | 11 x 9 | |
| 13 | 457 | Cas | OC | 6.4 | 13 | Phi Cas Cluster |
| 14 | 869/ 884 | Per | OC double | 4.3 | 30 and 30 | Sword Handle |
| 15 | 6826 | Cyg | PN | 9.8 | 0.5/2.3 | Blinking Nebula |
| 16 | 7243 | Lac | OC | 6.4 | 21 | |
| 17 | 147 | Cas | dE4G | 9.3 | 13 x 8 | |
| 18 | 185 | Cas | dE0G | 9.2 | 12 x 9 | |
| 19 | IC 5146 | Cyg | BN | 10.0 | 12 x 12 | Cocoon Neb |
| 20 | 7000 | Cyg | BN | 6.0 | 120 x 100 | North American Nebula |
| 21 | 4449 | CVn | IG | 9.4 | 5 x 3 | |
| 22 | 7662 | And | PN | 9.2 | 0.3/2.2 | |
| 23 | 891 | And | SbG | 9.9 | 14 x 2 | |
| 24 | 1275 | Per | Seyfert G | 11.6 | 2.6 x 1 | Per A radio source |
| 25 | 2419 | Lyn | GC | 10.4 | 4.1 | |
| 26 | 4244 | CVn | SG | 10.6 | 16 x 2.5 | |
| 27 | 6888 | Cyg | BN | 7.5 | 20 x 10 | Crescent Nebula |
| 28 | 752 | And | OC | 5.7 | 50 | |
| 29 | 5005 | CVn | SbG | 9.8 | 5.4 x 2 | |
| 30 | 7331 | Peg | SbG | 9.5 | 11 x 4 | |
| 31 | IC 405 | Aur | BN | 6.0 | 30 x 19 | Flaming Star Nebula |
| 32 | 4631 | CVn | ScG | 9.3 | 15 x 3 | |
| 33 | 6992/5 | Cyg | SN | — | 60 x 8 | East Veil Nebula |
| 34 | 6960 | Cyg | SN | — | 70 x 6 | West Veil Nebula |
| 35 | 4889 | Com | E4G | 11.4 | 3 x 2 | Brightest in cluster |
| 36 | 4559 | Com | ScG | 9.8 | 10 x 4 | |
| 37 | 6885 | Vul | OC | 5.7 | 7 | |
| 38 | 4565 | Com | SbG | 9.6 | 16 x 3 | |
| 39 | 2392 | Gem | PN | 9.9 | 0.2/0.7 | Eskimo Nebula |
| 40 | 3626 | Leo | SbG | 10.9 | 3 x 2 | |
| 41 | — | Tau | OC | 1.0 | 330 | Hyades |
| 42 | 7006 | Del | GC | 10.6 | 2.8 | Very distant globular |
| 43 | 7814 | Peg | SbG | 10.5 | 6 x 2 | |
| 44 | 7479 | Peg | SBbG | 11.0 | 4 x 3 | |
| 45 | 5248 | Boo | ScG | 10.2 | 6 x 4 | |
| 46 | 2261 | Mon | BN | 10.0 | 2 x 1 | Hubble’s Variable Neb. |
| 47 | 6934 | Del | GC | 8.9 | 5.9 | |
| 48 | 2775 | Can | SaG | 10.3 | 4.5 x 3 | |
| 49 | 2237-9 | Mon | BN | — | 80 x 60 | Rosette Nebula |
| 50 | 2244 | Mon | OC | 4.8 | 24 | |
| 51 | IC 1613 | Cet | IG | 9.0 | 12 x 11 | |
| 52 | 4697 | Vir | E4G | 9.3 | 6 x 3 | |
| 53 | 3115 | Sex | E6G | 9.1 | 8 x 3 | Spindle Galaxy |
| 54 | 2506 | Mon | OC | 7.6 | 7 | |
| 55 | 7009 | Aqr | PN | 8.3 | 2.5/1 | Saturn Nebula |
| 56 | 246 | Cet | PN | 8.0 | 3.8 | |
| 57 | 6822 | Sgr | IG | 9.3 | 10 x 9 | Barnard’s Galaxy |
| 58 | 2360 | CMa | OC | 7.2 | 13 | |
| 59 | 3242 | Hya | PN | 8.6 | 0.3/21 | Ghost of Jupiter |
| 60 | 4038 | Crv | ScG | 11.3 | 2.6 x 1.8 | The Antennae |
| 61 | 4039 | Crv | ScG | 13.0 | 3.2 x 2.2 | The Antennae |
| 62 | 247 | Cet | SG | 8.9 | 20 x 7 | |
| 63 | 7293 | Aqr | PN | 6.5 | 13 | Helix Nebula |
| 64 | 2362 | CMa | OC | 4.1 | 8 | Tau CMa Cluster |
| 65 | 253 | Scl | SG | 7.1 | 25 x 7 | Sculptor Galaxy |
| 66 | 5694 | Hya | GC | 10.2 | 3.6 | |
| 67 | 1097 | For | SBbG | 9.2 | 9 x 6 | |
| 68 | 6729 | CrA | BN | 9.7 | 1.0 | R CrA Nebula |
| 69 | 6302 | Sco | PN | 12.8 | 0.8 | Bug Nebula |
| 70 | 300 | Scl | SdG | 8.1 | 20 x 13 | |
| 71 | 2477 | Pup | OC | 5.8 | 27 | |
| 72 | 55 | Scl | SBG | 8.2 | 32 x 6 | Brightest in Scl Cluster |
| 73 | 1851 | Col | GC | 7.3 | 11 | |
| 74 | 3132 | Vel | PN | 8.2 | 0.8 | |
| 75 | 6124 | Sco | OC | 5.8 | 29 | |
| 76 | 6231 | Sco | OC | 2.6 | 15 | |
| 77 | 5128 | Cen | Peculiar Galaxy | 7.0 | 18 x 14 | Cen A radio source |
| 78 | 6541 | CrA | GC | 6.6 | 13 | |
| 79 | 3201 | Vel | GC | 6.7 | 18 | |
| 80 | 5139 | Cen | GC | 3.6 | 36 | Omega Centauri |
| 81 | 6352 | Ara | GC | 8.1 | 7 | |
| 82 | 6193 | Ara | OC | 5.2 | 15 | |
| 83 | 4945 | Cen | SBcG | 9.5 | 20 x 4 | |
| 84 | 5286 | Cen | GC | 7.6 | 9 | |
| 85 | IC 2391 | Vel | OC | 2.5 | 50 | o (Omicron) Vel Cluster |
| 86 | 6397 | Ara | GC | 5.6 | 26 | |
| 87 | 1261 | Hor | GC | 8.4 | 7 | |
| 88 | 5823 | Cir | OC | 7.9 | 10 | |
| 89 | 6087 | Nor | OC | 5.4 | 12 | S Nor Cluster |
| 90 | 2867 | Car | PN | 9.7 | 0.2 | |
| 91 | 3532 | Car | OC | 3.0 | 55 | |
| 92 | 3372 | Car | BN | 6.2 | 120 x 120 | Eta Carinae Nebula |
| 93 | 6752 | Pav | GC | 5.4 | 20 | |
| 94 | 4755 | Cru | OC | 4.2 | 10 | Jewel Box Cluster |
| 95 | 6025 | TrA | OC | 5.1 | 12 | |
| 96 | 2516 | Car | OC | 3.8 | 30 | |
| 97 | 3766 | Cen | OC | 5.3 | 12 | |
| 98 | 4609 | Cru | OC | 6.9 | 5 | |
| 99 | — | Cru | DN | — | 400 x 300 | Coal Sack |
| 100 | IC 2944 | Cen | OC | 4.5 | 15 | – (Lambda) Cen Cluster |
| 101 | 6744 | Pav | SBbG | 9.0 | 16 x 10 | |
| 102 | IC 2602 | Car | OC | 1.9 | 50 | ÷ (Theta) Car Cluster |
| 103 | 2070 | Dor | BN | 1.0 | 40 x 25 | Tarantula Neb. in LMC |
| 104 | 362 | Tuc | GC | 6.6 | 13 | |
| 105 | 4833 | Mus | GC | 7.3 | 14 | |
| 106 | 104 | Tuc | GC | 4.0 | 31 | 47 Tucanae |
| 107 | 6101 | Aps | GC | 9.3 | 11 | |
| 108 | 4372 | Mus | GC | 7.8 | 19 | |
| 109 | 3195 | Cha | PN | — | 0.6 |
BN = Bright nebula
GC = Globular cluster
OC = Open cluster
EG = Elliptical (type) galaxy
DN = Dark nebula
IG = Irregular galaxy
PN = Planetary nebula
SN = Supernova remnant
SG = Spiral (type) galaxy
C3 NGC 4236
Added more data to this one but still very tricky. More horrible gradients to deal with. The IDAS P2 LP filter is no longer doing it’s job with the change in LP sources round here. Have now bought the IDAS D3 to see if that is any better as it deals more with LED lighting.
| Object ID | C3 NGC 4236 Draco |
| Details | Mag. 10.5 Size 121′.9 × 7′.2 2021-04-12 |
| Telescope | 250mm f4.8 Newtonian MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 20x180s, 25x300s 10/50 gain/offset darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz DeNoise AI |
C5 The Hidden Galaxy
Another go a this for the ASE Caldwell Project. A really tricky one this. Hidden in the dust from our own galaxy, this would actually be naked eye brightness if not obscured. From two sets of data but still challenging.
| Object ID | C4 NGC7023 Iris Nebula |
| Details | Mag. 9.1 Size 21.4′ x 20.9′ 2021-04-11 |
| Telescope | 250mm f4.8 Newtonian, MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 25 x 240s, 14x180s darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz Denoise AI |
C4 NGC7023 Iris Nebula
Another for the ASE Caldwell Project. Horrible gradient to deal with but background is messed around with to bring out all the dust around it. Makes the rest of the background messy though.
| Object ID | C4 NGC7023 Iris Nebula |
| Details | Mag. 6.8 Size 18′ x 18′ 2021-04-09 |
| Telescope | 250mm f4.8 Newtonian, MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 25 x 240s darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz Denoise AI |
NGC 4631 Whale Galaxy
One for the ASE Caldwell Project
| Object ID | NGC 4631 Whale Galaxy |
| Details | Mag. 9.8 Size 15.5′ x 2.7′ 2021-04-03 |
| Telescope | 250mm f4.8 Newtonian, MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 30 x 240s darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz Denoise AI |
C24 NGC 1275 Perseus A
For the ASE Caldwell project. Loads of galaxies in this image.
| Object ID | NGC 457 C13 Owl Cluster |
| Details | Mag. 11.6 2021-03-30 |
| Telescope | 250mm f4.8 Newtonian, MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 20x180s darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz Denoise AI |
C13 NGC 457 Owl Cluster
For the ASE Caldwell project
| Object ID | NGC 457 C13 Owl Cluster |
| Details | Mag. 6.4 2021-03-30 |
| Telescope | 250mm f4.8 Newtonian, MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 10x180s darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop |