I wish to gratefully acknowledge the following web sites and scientific institutions for the research and image materials used herein:
Research & Images provided by Harvard-Smithsonian Center for Astrophysics for the Chandra X-ray Observatory which is Operated for NASA by SAO.
Research & Query was made possible through the use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Research, Query & Name Resolving was made possible via the SIMBAD database web site, operated at CDS, Strasbourg, France.
Image and Image Data provided by the the European Organisation for Astronomical Research in the Southern Hemisphere website.
Horsehead Nebula Image courtesy Astrophotography Hunter Wilson and used here under the terms of the Creative Commons License Attribution-Share Alike 3.0 Unported
Abell 39, aka PN A66 39 -- Spherical Planetary Nebula
Credit: George Jacoby (WIYN Obs.) et al., WIYN/NOAO/NSF
Spectral type || Radial velocity: ~ || ~
Located: RA 16h 27m 32.6s Dec +27 54' 29"
NGC 7293, aka The Helix Nebula -- Planetary Nebula
Credit: NASA, WIYN, NOAO, ESA, Hubble Helix Nebula Team
Spectral type || Radial velocity: DA || km/s -15 [blueshift]
Loacated: RA 22 29 38.55 Dec -20 50 13.6
NGC 6543, aka Cat's Eye Nebula -- Planetary Nebula
Credit: Vicent Peris (OAUV / PTeam), MAST, STScI, AURA, NASA
Spectral type|| Radial velocity: ~ || km/s -65.7 [blueshift]
Location: RA 17 58 33.423 Dec +66 37 59.52
NGC 6853, aka M 27 || Dumbbell Nebula -- Planetary Nebula
Credit: Michael Pierce (Indiana U.) et al., WIYN, AURA, NOAO, NSF
Spectral type || Radial velocity: DA || km/s -42 [blueshift]
Location: RA 19 59 36.340 Dec +22 43 16.09
NGC 2392, aka Eskimo, Clown Nebula -- Planetary Nebula
Credit: Andrew Fruchter (STScI) et al., WFPC2, HST, NASA
Spectral type || Radial velocity: O6 || km/s 84.2 [redshift]
Location: RA 07 29 10.7669 Dec +20 54 42.488
NGC 6720, aka M57, Ring Nebula -- Planetary Nebula
Credit: H. Bond et al., Hubble Heritage Team (STScI / AURA), NASA
Spectral type || Radial velocity: ~ || km/s -19.2 [blueshift]
Location: RA 18 53 35.079 Dec +33 01 45.03
SN 1572, aka Tycho's Supernova -- Supernova Remnant
Credit: NASA/CXC/Rutgers/J.Warren & J.Hughes et al., Chandra X-ray Observatory/SAO
Spectral type || Radial velocity: B8 || ~
Location: RA 00 25 08.07 Dec +64 09 55.7
NGC 2440, aka ESO 560-9, HD 62166 -- Planetary Nebula
Credit: H. Bond (STScI), R. Ciardullo (PSU), WFPC2, HST, NASA
Spectral type || Radial velocity: ~ || km/s 62.7 [redshift]
Location: RA 07 41 54.91 Dec -18 12 29.7
NGC 2346, aka HD 293373 -- Planetary Nebula
Credit: Massimo Stiavelli (STScI), Inge Heyer (STScI) et al., & the Hubble Heritage Team
Spectral type || Radial velocity: A5V || km/s 21.8 [redshift]
Location: RA 07 09 22.5210 Dec -00 48 23.596
IC 1396, aka Cl Trumpler 37 -- Emission Nebula
Credit: Digitized Sky Survey, ESA/ESO/NASA FITS Liberator
Spectral type || Radial velocity: ~ || km/s -15.35 [blueshift]
Location: RA 21 38 08.7 Dec +57 26 48
NGC 2237, aka Rosette Nebula, LBN 948 -- HII region ionized by NGC 2244
Credit: T. A. Rector, B. Wolpa, M. Hanna (AURA/NOAO/NSF)
Spectral type || Radial velocity: ~ || ~
Location: RA 06 31 40 Dec +04 57.8
IC 434, Horsehead, Barnard 33, Flame Nebula -- HII (ionized) region -- Dark Cloud Nebula Horsehead --
Credit: Hunter Wilson
Spectral type || Radial velocity: ~ || ~
Location: RA 05 40 59.0 Dec -02 27 30