2018 images

In 2018 I bought my SX694 to give me a bit more F.O.V., slightly smaller pixels and higher Q.E. compared to my Starlight Xpress SXVF-H9. Some of the data I had acquired with the newer camera was never processed until recently. It's still a work in progress but I'll post some of the images here as I work through them.

One of the issues I had using the newer camera was the presence of a circular gradient I could never correct with flat fields therefore not allowing me to fully stretch the data to my liking. This gradient was not apparent in my H9 images due to the smaller field with the AT10RC. Only a few years ago did I find, by chance, this issue was caused by the baffle tube being a bit too short allowing light from the telescope aperture to hit the inside of the baffle creating the rings. All my images from 2011 till mid-2022 with the AT10RC were taken without the baffle extension.

The extension was purchased from here. https://buckeyestargazer.net/Store/GSOBaffleEXT.php

Flat W/O Baffle

Flat W/Baffle

With some newer tools available in Astroart, I'm revisiting these older stacks to see what I can salvage for display.

Eris (2024)

Dwarf Planet Eris

Magnitude: 18.6 (est.)

Distance: ~94.6 AU 
Physical size: 2,377 km. (1,477 mi.)

Date acquired: October 7, 2024

Ambient Temp: 54F

Camera: Starlight Xpress SX-694 (2x2 binning) 

Guider: Starlight Xpress Lodestar off-axis.
Scope: Astrotech AT10RC @F/8 (2000 mm)

Mount: Losmandy Titan w/Gemini-2

Filters: Astronomik L type 2c.
Exposures: L= 22 x 180 seconds (66 minutes total)
Acquired, calibrated, stacked (Sum) in Astroart 9

Processing Notes:

Calibrated with Flats, Bias & Defect Map

Linear Gradient removal to correct for light pollution.

Eris was close to opposition during this session.

I last imaged Eris in 2012.

Palomar 5 (UGC 9792)

Palomar 5 in Serpens

Type: Globular Cluster

Magnitude: 11.8

Apparent Size: 8'
Distance: 75.6 kly
Physical size: ~152 ly

Date acquired: May 31, 2024

Sky Brightness ~18.25 mag/arcsec^2

Ambient Temp: 58F- 56F

Camera: Starlight Xpress SX-694 (2x2 binning) 
Guider: Starlight Xpress Lodestar off-axis.
Scope: Astrotech AT10RC @F/8 (2000 mm)

Mount: Losmandy Titan w/Gemini-2

Filters: Astronomik L type 2c.
Exposures: L= 13 x 120 seconds
Acquired, calibrated, stacked (Median) in Astroart 8

Processing Notes:

Calibrated with Flats, Bias & Defect Map

Linear Gradient removal to correct for light pollution.

Images were taken (mistakenly) without the cooler enabled so the subs were noisy. Bias, Flats and Darks were subsequently taken with the roughly the same temperature to salvage the data. The image is clipped considerably to mask the noise. Median stacking was used since a few satellite trails spoiled some images. There is also a noticeable elongation of the stars which may have been due to mis-collimation or poor polar alignment.

NGC 5053

NGC 5053 in Coma Berenices

Type: Globular Cluster

Magnitude: 9.8

Apparent Size: 10.5'
Distance: 56.7 kly
Physical size: ~160 ly

Date acquired: May 31, 2024

Sky Brightness ~18.25 mag/arcsec^2

Ambient Temp: 64F - 59F

Camera: Starlight Xpress SX-694 (2x2 binning) 
Guider: Starlight Xpress Lodestar off-axis.
Scope: Astrotech AT10RC @F/8 (2000 mm)

Mount: Losmandy Titan w/Gemini-2

Filters: Astronomik L, R, G & B type 2c.
Exposures: L= 24 x 90 sec; R,G,B = 7 x 90 seconds each.
Acquired, calibrated, stacked (Median) LRGB combined in Astroart 8

Processing Notes:

Calibrated with Flats, Bias & Defect Map

Linear Gradient removal to correct for light pollution.
DDP stretch on Lum.

Noise Filter on RGB masters

Images were taken (mistakenly) without the cooler enabled so the subs were noisy. Bias, Flats and Darks were subsequently taken with the roughly the same temperature to salvage the data. The image is clipped considerably to mask the noise. Median stacking was used since a few satellite trails spoiled some images. Astronomical twilight did not end until halfway through the session.

April 8th 2024 Partial Solar Eclipse

Here is a quick post of .JPG images from my Canon T4i of the recent solar eclipse.

About 15 minutes after 1st contact the clouds quickly rolled in.

Barnard's Star 2007 - 2023

 Here is a 2 frame .GIF showing the proper motion of Barnard's Star over 16 years.

I have been taking images of Barnard's Star every year since 07' and will at some point make a comparison with even more references.

The 2007 version was one of the first images taken when I got my Starlight Xpress SXVF-H9 camera.

This version was only a stack of (3) 30 second subs through a Celestron C11 with an Optec F5 focal reducer. A Focal length of 1400mm and no filters used. The original subs had quite a strong optical vignette that I was able to correct with Astroart's gradient filters.

The 2023 version was with my current setup, AT10RC @F8 2000mm, SX-694 & LPS-D3 filter. A stack of (39) 20 second exposures.

The SNR was higher in the 2007 image since it was taken @F5 on a 280mm SCT and I needed to adjust the histogram quite a bit to closely match the 2023 version in both background and star intensity. Light pollution levels were also much lower for me back in 07'. Since that time, LED street lights have been installed all over the area including my street along with most of my neighbors having security lights with no shielding.

Barnard's Star (Tycho 425-2502-1) has the largest known proper motion of a star across our sky 10.39" arc per year. It's also the 4th nearest star to our Solar System (5.96 ly.) after the Alpha Centauri system. For me it's the closest visible star (with optical aid) from my latitude.

Planetary Nebula NGC 2392

NGC 2392 in Gemini

Type: Planetary Nebula

Magnitude: 10.1

Apparent Size: 54" (as measured in AA)
Distance: 880 pc
Physical size: ~.62 ly

Dates acquired: April 10 & 12, 2023

Camera: Starlight Xpress SX-694 (1x1 binning)
Guider: Starlight Xpress Lodestar off-axis.
Scope: Astrotech AT10RC @F/7.8 (1987mm)

Mount: Losmandy Titan w/Gemini-2

Filters: Astronomik Ha 6nm ,OIII 12nm, Idas LPS-D3
Exposures: Ha= 92 min. OIII= 92 min both 60" & 120"

Cropped F.O.V. = 8.55' x 8.55' @.47" arc/pixel
Acquired, calibrated, stacked (avg) in Astroart 8

Processing Notes:

Calibrated with Bias & Defect Map only.
Log stretch

Ha:OIII:OIII color combine.

Below are 2 comparison images of NGC 2392 superimposed onto the Moon for scale reference.

It was tricky getting the nebulas colors & brightness to be visible compared to the Moon as both original .FIT images (64bit) have different histogram shapes.