Basic object information
Object name: NGC 3372
Popular name: Keyhole Nebula
Object type: Bright nebula
Magnitude: 3.0
Size: 120.0'x120.0'
Object classification: E
Description: ! great neb,Eta Carinae Notes: Keyhole Nebula & nova-like var Eta Car invl;many drk lanes

Catalog information
RA (J2000.0): 10h 45m 06.0s
Dec (J2000.0): -59 52' 00"
Constellation: Carina

Observer: Iiro Sairanen
Obs. Obs. place: Nangerwalla, Mullewa, Australia
Date/Time: 17/18.12.2009 1:30

Telescope: Newton 110/805 mm

Magn: 38x
Field: 106'
SQM: 22.0 (1)
Visuality: I

FilteFilter: O-III
NNE Lim.mag: 7.8
Seeing: 2
Height: 42

Weather: +19C

Eta Carinae Nebula. What a mess! The largest possible field is needed to see the whole complex at the same time. This is very good object for binoculars and small telescopes. O-III filter gives a good contrast and weak structures become much sharper, of course many of them are visible without filters. Especially Key Hole Nebula around Eta Carinae is full of details. Reminds me little bit of M8 with dark canals and open clusters.