Picture credits

Reference pictures of catalogue objects come from Wikimedia Commons; each keeps its own licence.

Messier

M 1
NASA's Marshall Space Flight Center · Public domain · Commons page
M 2
SeanXCurry · CC BY-SA 4.0 · Commons page
M 3
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 4
Hewholooks · CC BY-SA 3.0 · Commons page
M 5
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 6
Minnastronomer · CC BY 4.0 · Commons page
M 7
ESO · CC BY 3.0 · Commons page
M 8
Hewholooks · CC BY-SA 3.0 · Commons page
M 9
NASA, STScI, WikiSky · Public domain · Commons page
M 10
ESA/Hubble & NASA · CC BY 3.0 · Commons page
M 11
N.A.Sharp, REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 12
ESA/Hubble & NASA · Public domain · Commons page
M 13
Giuseppe Donatiello from Oria (Brindisi), Italy · CC0 · Commons page
M 14
Hewholooks · CC BY-SA 3.0 · Commons page
M 15
ESA/Hubble & NASA · Public domain · Commons page
M 16
ESO · CC BY 4.0 · Commons page
M 17
ESO · CC BY 4.0 · Commons page
M 18
Hillary Mathis, REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 19
Chuck Ayoub · CC0 · Commons page
M 20
rocco parisi · CC BY-SA 4.0 · Commons page
M 21
REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 22
Giuseppe Donatiello · CC0 · Commons page
M 23
N.A.Sharp, REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 24
(Credit) ESO/TIMER survey · CC BY 4.0 · Commons page
M 25
Hillary Mathis, Vanessa Harvey, REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 26
Hillary Mathis, Vanessa Harvey, REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 27
George Jacoby, WIYN/NSF · CC BY 4.0 · Commons page
M 28
HST / Fabian RRRR ( talk ) · CC BY-SA 3.0 · Commons page
M 29
Hillary Mathis/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 30
NASA, STScI, WikiSky · Public domain · Commons page
M 31
Lviatour · CC BY-SA 2.5 · Commons page
M 32
Tod R. Lauer/NASA · Public domain · Commons page
M 33
NASA/JPL-Caltech · Public domain · Commons page
M 34
REU program/NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 35
rocco parisi · CC BY-SA 4.0 · Commons page
M 36
NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 37
NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 38
Giuseppe Donatiello · CC0 · Commons page
M 39
Christian van Endern · CC BY-SA 3.0 · Commons page
M 40
NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 41
Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. · Public domain · Commons page
M 42
NASA, ESA, M. Robberto (Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team · Public domain · Commons page
M 43
ESA/Hubble & NASA · Public domain · Commons page
M 44
Giuseppe Donatiello from Oria (Brindisi), Italy · CC0 · Commons page
M 45
NASA, ESA, AURA/Caltech, Palomar Observatory The science team consists of: D. Soderblom and E. Nelan (STScI), F. Benedict and B. Arthur (U. Texas), and B. Jones (Lick Obs.) · Public domain · Commons page
M 46
Jose Luis Martinez · CC BY-SA 4.0 · Commons page
M 47
Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. · Public domain · Commons page
M 48
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 49
RubinObs/NOIRLab/SLAC/NSF/DOE/AURA · CC BY 4.0 · Commons page
M 50
NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
M 51
S. Beckwith (STScI), Hubble Heritage Team, (STScI/AURA), ESA, NASA, Additional Processing: Robert Gendler · Public domain · Commons page
M 52
g.barbarino · CC BY-SA 2.0 · Commons page
M 53
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 54
ESA/Hubble & NASA · CC BY 3.0 · Commons page
M 55
Starhopper · CC BY-SA 4.0 · Commons page
M 56
NASA, STScI, WikiSky · Public domain · Commons page
M 57
The Hubble Heritage Team (AURA/STScI/NASA) · Public domain · Commons page
M 58
Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona · CC BY-SA 3.0 us · Commons page
M 59
ESA/Hubble & NASA, L. Ho et al. · CC BY 4.0 · Commons page
M 60
NASA, ESA · CC BY 3.0 · Commons page
M 61
Hillary Mathis, N.A.Sharp/NOIRLab/ NSF /AURA/ · CC BY 4.0 · Commons page
M 62
NASA, STScI, WikiSky · Public domain · Commons page
M 63
Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona · CC BY-SA 3.0 us · Commons page
M 64
NASA and The Hubble Heritage Team (AURA/STScI) · Public domain · Commons page
M 65
Ngc1535 · CC BY-SA 4.0 · Commons page
M 66
Ngc1535 · CC BY-SA 4.0 · Commons page
M 67
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 68
NASA, STScI, WikiSky · Public domain · Commons page
M 69
NASA, STScI, WikiSky · Public domain · Commons page
M 70
NASA, STScI, WikiSky · Public domain · Commons page
M 71
NASA, STScI, WikiSky · Public domain · Commons page
M 72
NASA, STScI, WikiSky · Public domain · Commons page
M 73
Roberto Mura · CC BY-SA 4.0 · Commons page
M 74
NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration. Acknowledgment: R. Chandar (University of Toledo) and J. Miller (University of Michigan) · Public domain · Commons page
M 75
HST / Fabian RRRR ( talk ) · CC BY-SA 3.0 · Commons page
M 76
ESA · CC BY-SA 3.0 igo · Commons page
M 77
NASA, ESA & A. van der Hoeven · Public domain · Commons page
M 78
ESO/Igor Chekalin · CC BY 4.0 · Commons page
M 79
NASA and ESA Acknowledgement: S. Djorgovski (Caltech) and F. Ferraro (University of Bologna) · CC BY 4.0 · Commons page
M 80
Chuck Ayoub · CC0 · Commons page
M 81
Ken Crawford · CC BY-SA 4.0 · Commons page
M 82
NASA, ESA, and The Hubble Heritage Team (STScI/AURA) · Public domain · Commons page
M 83
NASA, ESA, and the Hubble Heritage Team (STScI/AURA) Acknowledgement: William Blair (Johns Hopkins University) · Public domain · Commons page
M 84
ESO · CC BY 4.0 · Commons page
M 85
NASA, STScI, WikiSky · Public domain · Commons page
M 86
NASA, STScI, WikiSky · Public domain · Commons page
M 87
NASA, ESA and the Hubble Heritage Team (STScI/AURA); Acknowledgment: P. Cote (Herzberg Institute of Astrophysics) and E. Baltz (Stanford University) · Public domain · Commons page
M 88
Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona · CC BY-SA 3.0 us · Commons page
M 89
NASA, STScI, WikiSky · Public domain · Commons page
M 90
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 91
Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona · CC BY-SA 3.0 us · Commons page
M 92
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 93
Sergio Eguivar · CC BY-SA 4.0 · Commons page
M 94
R Jay Gabany (Blackbird Obs.) · CC BY-SA 3.0 · Commons page
M 95
ESO · CC BY 3.0 · Commons page
M 96
ESO/Oleg Maliy · CC BY 3.0 · Commons page
M 97
Göran Nilsson & The Liverpool Telescope · CC BY-SA 4.0 · Commons page
M 98
ESO Acknowledgements: Flickr user jbarring · CC BY 4.0 · Commons page
M 99
Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona · CC BY-SA 3.0 us · Commons page
M 100
ESO/IDA/Danish 1.5 m/R. Gendler, J.-E. Ovaldsen, C. C. Thöne and C. Féron · CC BY 4.0 · Commons page
M 101
Image: European Space Agency & NASA Acknowledgements: Project Investigators for the original Hubble data: K.D. Kuntz (GSFC), F. Bresolin (University of Hawaii), J. Trauger (JPL), J. Mould (NOAO), and Y.-H. Chu (University of Illinois, Urbana) Image processing: Davide De Martin (ESA/Hubble) CFHT image: Canada-France-Hawaii Telescope/J.-C. Cuillandre/Coelum NOAO image: George Jacoby, Bruce Bohannan, Mark Hanna/NOAO/AURA/NSF · CC BY 4.0 · Commons page
M 102
NASA, ESA, and The Hubble Heritage Team (STScI/AURA) · Public domain · Commons page
M 103
Jim Mazur · CC BY-SA 4.0 · Commons page
M 104
NASA/ESA and The Hubble Heritage Team (STScI/AURA) · Public domain · Commons page
M 105
ESA/Hubble & NASA, C. Sarazin et al. · CC BY 4.0 · Commons page
M 106
NASA, ESA, the Hubble Heritage Team (STScI/AURA), and R. Gendler (for the Hubble Heritage Team). Acknowledgment: J. GaBany · Public domain · Commons page
M 107
ESA/Hubble & NASA · CC BY 3.0 · Commons page
M 108
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 109
Sloan Digital Sky Survey · CC BY 4.0 · Commons page
M 110
NOIRLab/NSF/AURA · CC BY 4.0 · Commons page

Caldwell

C 1
Roberto Mura · Public domain · Commons page
C 2
WIYN/NOIRLab/NSF · CC BY 4.0 · Commons page
C 3
Mattrsmith77 · CC BY 4.0 · Commons page
C 4
T.A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOIRLab/ NSF /AURA · CC BY 4.0 · Commons page
C 5
Sean Curry · CC BY-SA 3.0 · Commons page

Herschel 400

NGC 129
IGAPS & Melina Thévenot · CC BY-SA 4.0 · Commons page
NGC 136
NASA/ESA/Hubble & Fits Liberator/Photoshop & Clément Violette · CC BY-SA 4.0 · Commons page
NGC 157
ESO · CC BY 4.0 · Commons page
NGC 225
Hewholooks · CC BY-SA 3.0 · Commons page
NGC 278
Roberto Mura · Public domain · Commons page

Sharpless

Sh2-3
NASA/JPL-Caltech/GLIMPSE-MIPSGAL Teams · Public domain · Commons page
Sh2-8
europeanspaceagency · CC BY 4.0 · Commons page
Sh2-11
NASA · Public domain · Commons page
Sh2-27
Thierry Boufflet · CC BY 4.0 · Commons page
Sh2-37
Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona · CC BY-SA 3.0 us · Commons page

RASC Finest NGC

IC 289
Tom Wildoner · CC BY-SA 4.0 · Commons page
NGC 1232
ESO/IDA/Danish 1.5 m/R.Gendler and A. Hornstrup. · CC BY 4.0 · Commons page
NGC 1514
International Gemini Observatory/NOIRLab/NSF/AURA Image Processing: J. Miller & M. Rodriguez (International Gemini Observatory/NSF NOIRLab), T.A. Rector (University of Alaska Anchorage/NSF NOIRLab), D. de Martin & M. Zamani (NSF NOIRLab) · CC BY 4.0 · Commons page
NGC 2237
Manolo Gómez from Berlin, Deutschland · CC BY 4.0 · Commons page