- Planetary Nebulae of the Abell Catalogue (Per) -

Aql (4) Cnc (1) Dra (1) Hya (1) Ori (2) Vul (1)
Cas (4) Cyg (2) Gem (1) Lac (2) Per (1)
Cep (2) Del (1) Her (1) Lyr (1) Vir (2)

Abell 4 (PN)

../dss/dss2blue_024523.67_+423304.94_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: Abell 4, PK144-15.1
Type: PN
Constellation: Per
Coordinates: 02h45m23.67s / +42°33'04.94"
Brightness / Size: b15m6 / 0.4x0.4'
Robert Zebahl
120mm f/5, 75x + UHC, Bortle 4, SQM-L 20.9
Tried also at 75x with [OIII] filter without any success.

FAILED
152mm f/5.9, 60x + [OIII], Bortle 3-, SQM-L 21.3
Also nothing visible at 100x with UHC filter.

FAILED
8" f/6, 80x + [OIII], Bortle 4, SQM-L 20.9
Small, faint, evenly bright, round disc.

MODERATE
8" f/6, 80x + [OIII], Bortle 3, SQM-L 21.3
Small, round, evenly bright nebula.

MODERATE
12.5" f/4.5, 96x + [OIII], Bortle 3, SQM-L 21.3
Evident with averted vision, small, round, evenly bright. Almost visible with direct vision.

EASY
René Merting
8" f/4, 85x + [OIII], SQM-L 21.5
bei 85x sowie [OIII] ist der PN indirekt als kleines flächiges Scheibchen erkennbar - leicht zu halten - direkt nur schwer sichtbar

MODERATE
12.5" f/4.5, 111x + [OIII], SQM-L 21.5
bei 111x sowie [OIII] ist der PN indirekt als gut abgegrenztes homogen helles Scheibchen sichtbar
MODERATE