List of protoplanetary nebulae

This is a list of protoplanetary nebulae. These objects represent the final stage before a planetary nebula. During this stage, the red giant star begins to slowly expel its outermost layers of material. A protoplanetary nebula usually glows with the light from its parent star. This stage is usually brief, typically lasting no more than a few thousand years.

This list is incomplete; you can help by expanding it.

List
Image Name NGC Other designation Date discovered Distance (ly)
Boomerang Nebula Centaurus Bipolar Nebula About 5,000
Calabash Nebula OH231.8+4.2 About 4,200
Egg Nebula CRL 2688 1996 About 3,000
Frosty Leo Nebula IRAS 09371+1212 About 3,000
Red Rectangle Nebula HD 44179 1973 2,300 ± 300
Gomez's Hamburger IRAS 18059-3211 1985 6500
Cotton Candy Nebula IRAS 17150-3224
Water lily nebula IRAS 16594-4656
IRAS 22036+5306 About 6,500
Westbrook Nebula IRAS 04395+3601
IRAS 13208-6020
IRAS 20068+4051
LL Pegasi IRAS 23166+1655
M1-92 IRAS 19343+2926 About 8000
IRAS 19024+0044 11 000
IRAS 17163-3907 13 000
Minkowski's Butterfly M2-9 2 100
Robert 22 AFGL 4104
gollark: So you *also* have to store a timestamp or something?
gollark: So it's a random 4-byte string?
gollark: That actually probably *would* put it in the range of practical bruteforceability, since there are only 4 billion possible 4-byte values and anything you're doing by hand can't be *that* slow to run on a computer.
gollark: That's, er, 4 bytes.
gollark: Also also, things involving just scrambling the alphabet and using that fixed "scrambling" for each letter of the input are vulnerable to stuff like frequency analysis.

See also
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