Celestial hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  12 Mon  ·  NGC 2237  ·  NGC 2238  ·  NGC 2239  ·  NGC 2244  ·  NGC 2246  ·  NGC 2252  ·  Rosette A  ·  Rosette B  ·  Rosette Nebula  ·  Sh2-275  ·  The star 12Mon
Getting plate-solving status, please wait...
Rosette Nebula RGB, Rodd Dryfoos
Powered byPixInsight

Rosette Nebula RGB

Getting plate-solving status, please wait...
Rosette Nebula RGB, Rodd Dryfoos
Powered byPixInsight

Rosette Nebula RGB

Equipment

Loading...

Acquisition details

Loading...

Description

I love RGB-LRGB images, but my sky makes them very difficult and frustrating. I decided to shoot the Rosette because it represents a fairly easy nebula for broad band imaging due to its brightness. Also, it has significant narrow band emissions so bolstering the red and blue channels with Ha and OIII is available. I had intended to collect a lot more data, and to use a substantial amount of luminance. That was not to be, for the weather has been unrelenting. I finally decided to process the data after I collected the blue channel--which it self wasn't really finished, as I only had 45 usable subs....and that is being generous. The FWHM for the blue channel is higher than I wanted. Something is not quite right with my blue data....the stars look like flat discs--kind of like halos. Even if I am spot on focus. Even if the FWHM is similar to the red and green channel, they look like small halos--featureless and flat. Even the Bhatinov mask was barely working, for the spikes were lost in a haziness. Later in the evening I moved to Ursa Major and the B-mask worked perfectly--so maybe it was the section of sky I was shooting in--which has LP and it was hazy. I guess I was lucky to get 45 usable blue subs. But don't look too carefully...Normal viewing here folks! I decided to add just a touch of Ha to the red channel and OIII to the blue channel. I did not include Ha and OIII in the exposure times because I only used 10% of each or so. I do want to add more data--blue and luminance. But I also need to finish the Sh2-240 mosaic, so not sure it will happen....at least not very soon. Its a shame the blue channel is so poor--as red and green are not bad. having a poor channel impacts the stars.

The final version is just RGB. The title had been changed to reflect this

Comments

Revisions

  • Rosette Nebula RGB, Rodd Dryfoos
    Original
  • Rosette Nebula RGB, Rodd Dryfoos
    B
  • Rosette Nebula RGB, Rodd Dryfoos
    E
  • Rosette Nebula RGB, Rodd Dryfoos
    F
  • Rosette Nebula RGB, Rodd Dryfoos
    G
  • Rosette Nebula RGB, Rodd Dryfoos
    I
  • Rosette Nebula RGB, Rodd Dryfoos
    J
  • Rosette Nebula RGB, Rodd Dryfoos
    K
  • Rosette Nebula RGB, Rodd Dryfoos
    L
  • Rosette Nebula RGB, Rodd Dryfoos
    M
  • Rosette Nebula RGB, Rodd Dryfoos
    N
  • Rosette Nebula RGB, Rodd Dryfoos
    O
  • Rosette Nebula RGB, Rodd Dryfoos
    P
  • Rosette Nebula RGB, Rodd Dryfoos
    Q
  • Rosette Nebula RGB, Rodd Dryfoos
    R
  • Final
    Rosette Nebula RGB, Rodd Dryfoos
    S

B

Description: Image117x: A bit less star control

Uploaded: ...

E

Description: RGBc: Only RGB

Uploaded: ...

F

Description: Slight lift

Uploaded: ...

G

Description: Z2: improved stars and lifted nebula

Uploaded: ...

K

Description: Reprocessed Straight RGB

Uploaded: ...

L

Description: z4: reduced brightness

Uploaded: ...

M

Description: z5

Uploaded: ...

N

Description: z6

Uploaded: ...

O

Description: Lift

Uploaded: ...

P

Description: z9 - bright sections more defined

Uploaded: ...

Q

Description: z9a - final adjustments

Uploaded: ...

R

Description: Reprocess

Uploaded: ...

S

Description: Lifted black point

Uploaded: ...

Sky plot

Sky plot

Histogram

Rosette Nebula RGB, Rodd Dryfoos