A Very Large Mosaic

[avandonk]

Had a full clear night and managed to image four fields with the 300mm lens. So I whipped up this mosaic with RegiStar. Each field had at least 14x3min exposures at at ISO of 200.
Image details 3.9MB and 7912x5103 pixels. The field of view is 12.5X8.0 degrees.
http://users.bigpond.net.au/avandonk/Car_mos_sat+.jpg

The original tiff is about 240MB and the highest quality JPG is 42MB.

Bert

[Astroman (Andrew Wall)]

Nice shot Bert,

I was scanning around your image and found an interesting object, but now I think it may just be NGC3699.. Well it looks similar to a small comet on your image...

http://www.theastroweb.com/astronomy...mos_object.jpg

Basic object information

Name: NGC 3699
Type of object: Planetary nebula
Magnitude: 14.0
Size: 1.0'

Position (epoch of date)

Right ascension: 11h 28m 18s
Declination: -59° 59' 47"
Constellation: Centaurus

Local information

Altitude: 45° 10' 35"
Azimuth: 142° 50' 58"

Transit: 2h 58m 40s

Star atlas chart numbers:

Herald-Bobroff Astroatlas, Chart C-84
Millennium Star Atlas, Charts 989-990 (Vol II)
Sky Atlas 2000.0, Chart 25
Uranometria 2000 Chart 427, Vol 2


Revised NGC/IC Catalog Data

Wolfgang Steinicke, Feb 2001

Names and designations

NGC 3699
PK 292+1.1
ESO 129-PN21
AM 1125-594

Type of object: Planetary nebula

Catalog position for epoch J2000.0

Right ascension: 11h 27m 57.2s
Declination: -59° 57' 29"


Object information

Magnitude: 14.0
Size: 1.0'

Object classification: PN

Saguaro Astronomy Club v7.2 Catalog Data

Saguaro Astronomy Club, August 2000

Names and designations

NGC 3699
PK 292+1.1

Type of object: Planetary nebula

Catalog position for epoch J2000.0

Right ascension: 11h 27m 57.3s
Declination: -59° 57' 25"

Constellation: Centaurus

Object information

Magnitude: 14.0
Size: 1.1'

Description: B,pL,iR,pgpmbM
Notes: S neby w few F*

Strasbourg Planetary Nebula Catalog Data

Strasbourg Catalogue of Galactic Planetary nebulae
Acker, Marcout, and Ochsenbein 1980

Name: PK 292+ 1.1

Right ascension (J2000.0): 11h 27m 57.3s
Declination (J2000.0): -59° 57' 25"

Average diameter of brightest part of nebula: 67"

Mean radial velocity: -6 km/sec

Expansion velocity: greater than 18 km/sec

[RB (Andrew)]

That's a magnificent mosaic Bert !

Beautiful work.

[acropolite (Phil)]

That image is huge Bert, you can almost get lost in there.....

[tornado33]

Gee thats stunning, Bert, so much information on one image. Imagine that printed in A0 (large poster) size!
Scott

[iceman (Mike)]

Wow, that's incredible. Brilliant.

[sheeny (Al)]

Very, very impressive Bert!

Al.

[ballaratdragons (Ken)]

Excellent!!!!!! It just goes on and on and on and on . . . .

[Garyh]

:thum bsup:
5 out of 5 thumbs from me...
would make a great wall poster...very well done indeed..
Cheers

[avandonk]

Thanks all. If you click on the icon at the bottom right of the image in your browser on a typical monitor, the full image is 1.6 meters wide! The larger than 4MB images also show more detail. You should see the 42MB JPG image.
Below is a 100% crop at max quality from the 42MB JPG.

Can you see where I am headed with this. Look at the other image below. I have indexed the rotation on the 300mm lens so I know what rotational correction I should make to keep all images nice and parallel as the EQ mount is shifted from one field to the next. I am headed to the left if it is clear tonight.

Bert

[h0ughy (David)]

awesome, love it Bert! can you get the comet as well in your next series of shots?

[avandonk]

Light pollution makes it difficult. Melbourne and its suburbs are all south of me. Really need to get to a clear ocean horizon to do anything worthwhile. I am working on it. I have not been able to even try due to clouds.
Bert

[avandonk]

I played with the colour saturation. Is it better?
Large image 4MB
http://users.bigpond.net.au/avandonk/Car_mos_sat+.jpg

Bert

[RB (Andrew)]

I like the original better Bert (using a CRT btw).

[avandonk]

Here is a version using EasyHDR to compress the data from a 16 bit tiff.
Large image 4MB at full resolution

http://users.bigpond.net.au/avandonk..._easyhdr_4.jpg


The algorithm this program uses to compress a wide dynamic range image into an 8 or 16 bit image takes into account human visual response. This image would be much better if it was derived from a HDR image generated by a wide set of exposures.

Bert

[Ric]

Fantastic images Bert, really impressive.

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