Astrophotography by Tomi Virtanen, galaxies, NGC3729

Galaxies, NGC3729

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Updates:

19.9.2004 - created this page

Image list:

6.5.2004

Images:

Target: NGC3729, galaxy Date: 6.5.2004

Time: -

Location: Vantaa, Finland

Conditions: Astronomical twilight, naked eye limit magnitude ~3.5, random clouds.

Telescope: N150 f5 (GSO) Mount: GEM w RA stepper motor (Sky-View)

Camera: SC2 webcam (PCVC840K).
Raw color mode Filters: Baader #2459207 UV/IR-cut

Exposure: 100 x 15s (out of 240), dark frame and flat field. Unguided.

Processing: Stacked in K3CCDTools. Adjusted in Photoshop.

Images:
full resolution images displayed

Notes: During the 2 hours of astronomical twilight available at this late spring night I tried to get an image with galaxies NGC3729 and NGC3718 on the same frame. Latter one of the twilight hours was almost free of clouds so I managed to get 100 usable exposures. However, I didn't do well on aiming the telescope. If the indicated galaxy is NGC3729 then I should have aimed a half-frame to right (east) to get also the NGC3718.
Update 9.5.2004:
I downloaded a digital sky survey image of this area to check if this image really contains the NGC3729 galaxy. It appears that it is so, but at same time I discovered four ghost stars from my image. These, and where they came from, are indicated in the other image with arrows. This kind of ghost images are generated in stacking process when some of the frames are not aligned properly. Now I have to do the stacking process again taking care of proper alignment.

email: tomi.virtanen@yahoo.de

Target:	NGC3729, galaxy	Date:	6.5.2004
		Time:	-
		Location:	Vantaa, Finland
Conditions:	Astronomical twilight, naked eye limit magnitude ~3.5, random clouds.
Telescope:	N150 f5 (GSO)	Mount:	GEM w RA stepper motor (Sky-View)
Camera:	SC2 webcam (PCVC840K). Raw color mode	Filters:	Baader #2459207 UV/IR-cut
Exposure:	100 x 15s (out of 240), dark frame and flat field. Unguided.
Processing:	Stacked in K3CCDTools. Adjusted in Photoshop.
Images:	full resolution images displayed
Notes:	During the 2 hours of astronomical twilight available at this late spring night I tried to get an image with galaxies NGC3729 and NGC3718 on the same frame. Latter one of the twilight hours was almost free of clouds so I managed to get 100 usable exposures. However, I didn't do well on aiming the telescope. If the indicated galaxy is NGC3729 then I should have aimed a half-frame to right (east) to get also the NGC3718. Update 9.5.2004: I downloaded a digital sky survey image of this area to check if this image really contains the NGC3729 galaxy. It appears that it is so, but at same time I discovered four ghost stars from my image. These, and where they came from, are indicated in the other image with arrows. This kind of ghost images are generated in stacking process when some of the frames are not aligned properly. Now I have to do the stacking process again taking care of proper alignment.