- Planetary Nebulas (Gem) -

And (1) Cep (9) Del (3) Lac (4) Oph (1) Sge (4)
Aql (22) Cet (1) Dra (2) Leo (1) Ori (4) Sgr (3)
Aqr (2) Cnc (1) Eri (1) Lep (1) Peg (2) Tau (1)
Aur (2) Com (1) Gem (3) Lyn (1) Per (4) UMa (1)
Cam (2) Crv (1) Her (6) Lyr (5) Pup (2) Vul (3)
Cas (11) Cyg (20) Hya (2) Mon (1) Sct (2)

Abell 21 (PN)

../dss/dss2red_072902.69_+131448.40_15_web.jpg
Image source: DSS II (red) - 15×15'
Name: Abell 21, PK205+14.1, Medusa Nebula
Type: PN
Constellation: Gem
Coordinates: 07h29m02.69s / +13°14'48.40"
Brightness / Size: 11.3 mag / 10.0x6.0'
8" f/6, 37x + [OIII], Bortle 4, NELM 6.0, SQM-L 20.9
SQM-L 20.6: Crescentic (similar to the 1/3 illuminated moon), evenly bright, diffuse. Still visible with direct vision. With UHC filter also evident with averted vision.
EASY

NGC2371 (PN)

../dss/dss2blue_072534.68_+292926.40_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC2371, NGC2372, PK189+19.1, H2.316, H2.317, Peanut Nebula
Type: PN
Constellation: Gem
Coordinates: 07h25m34.68s / +29°29'26.40"
Brightness / Size: 11.3 mag / 1.0x1.0'
152mm f/5.9, 129x, Bortle 6, NELM 5.0+
At 49x pretty faint, roundish, evenly bright. At 129x slightly elongated with two differently bright knots. Positions and direction in the sketch are not accurate.

../sketches/2019-02-06_ngc2371_ngc2372.jpg

EASY
8" f/6, 150x, Bortle 4
At 37x well seen with averted vision as a small, oval brightening. At 150x I could see two roundish, well separated brightenings with direct vision. A UHC fitler increased contrast a bit, but with no more details.
EASY

NGC2392 (PN)

../dss/dss2blue_072910.77_+205442.48_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC2392, PK197+17.1, H4.45, Eskimo Nebula, Clownface Nebula
Type: PN
Constellation: Gem
Coordinates: 07h29m10.77s / +20°54'42.48"
Brightness / Size: 9.9 mag / 0.9x0.9'
70mm f/5.7, 100x, Bortle 6
At 15x very small and faint. Central star visible with averted vision. At 100x very conspicuous, round. Edges appeared slightly diffuse, center of the nebula was a bit brighter.

EASY
80mm f/6.25, 25x, Bortle 6, NELM 5.2
Barely seen with direct vision as very small, non-stellar brightening nearby an 8.24m star. At 62x an obvious, round disc.

EASY
152mm f/5.9, 100x, Bortle 6, NELM 5.0+
At 22x central star evident. With averted vision the nebula was also well visible as a halo around the central star. At 100x very bright, round, slightly brighter in the middle, edges rather diffuse. Positions and direction in the sketch are not accurate.

../sketches/2019-02-06_ngc2392.jpg

EASY
8" f/6, 37x, Bortle 4, NELM 6.0
The quite bright central star is most evident with direct vision, whereas the nebula is evident with averted vision. Bright, round, nearly evenly bright. At 171x I felt that the nebula gets slightly brighter toward the middle. I didn't focus on the much fainter, outer region.
EASY