The Keyhole Nebula in NGC 3372 Carina Nebula (Alex Woronow)

Celestial hemisphere: Southern · Constellation: Carina (Car) · Contains: Carina Nebula · Foramen · NGC 3372 · eta Car · eta Car Nebula

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The Keyhole Nebula in NGC 3372 Carina Nebula

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The Keyhole Nebula in NGC 3372 Carina Nebula

The Keyhole Nebula in NGC 3372 Carina Nebula

OTA: CDK 17

Camera: SBIG STXL1102 w/ AOX & FW8G

Observatory: Heaven’s Mirror, Chile

EXPOSURES:

Red: 8 x 900 sec.

Blue: 8 x9600

Green: 8 x 900

L: 6 x 900

H: 12 x 900

S: 13 x 900

O: 15 x 900

Total exposure 20 hours

Image Width: ~42 arcseconds

Processed by Alex Woronow (2020) using PixInsight, Skylum, Topaz, SWT

The historic Keyhole Nebula, just above the star Eta Carinae in the center of this picture, was drawn by John Hershel in 1840 using an 18.5” telescope he brought from England to S. Africa. But his drawing appears considerably different from what recent photographs reveal. However, since the time of the drawing, Eta Carinae underwent an immense explosion, and the debris from that explosion (creating the Homunculus Nebula around Eta Carinae) could have altered the lighting of the Keyhole Nebula. Image B at the right is a copy of John Herschel's drawing of the Keyhole Nebula...yes, it surely did look different!

The posted image is downsampled to about 70% of the original size.

Final
Original
B

B

Description: Herschel's drawing of the Keyhole Nebula done in 1840 from S. Africa

Uploaded: ...

Objects of the South - negative declination only
Astroimaging from Chile
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Narrowband imaging
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Status	Advanced success
Started	...
PixInsight job	Y8VV8SH32QZHIXDOLE7NTNVPATP28I9Q
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	10h44m39s.724
RA (top/left)	10h41m49s.730
RA (top/right)	10h44m04s.401
RA (bottom/right)	10h47m27s.354
RA (bottom/left)	10h45m15s.874

Dec (center)	-59°40′56″.43
Dec (top/left)	-59°54′35″.28
Dec (top/right)	-59°15′58″.51
Dec (bottom/right)	-59°27′03″.69
Dec (bottom/left)	-60°05′53″.56

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The Keyhole Nebula in NGC 3372 Carina Nebula

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