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Date: Dec. 11, 2024
Location: Siding Spring, Australia
Optics: Planewave 20"
Focal Length: 2259mm (focal reducer)
Camera: FLI-PL09000
Exposure: L:9x300s / R:6x300s / G: 6x300s / B: 6x300s
Filter: Astrodon E-Series L, R, G, B
Processing: PixInsight, Affinity Photo 2
Gum Nebula was visible clearer in HII OIII starless version below:
www.flickr.com/photos/hiroc/53822710308
We can not see the big red nebula. It is too faint for our unaided eyes to feel directly, but we can feel the existence of Gum Nebula as a vast G-shaped dark part in the sky as below. It spans about 40 degrees. www.flickr.com/photos/hiroc/16311565540
Gum Nebula exists about 1kLY away from us, and the diameter is about 1kLY. It means that Gum Nebula is extremely large and incredibly close to us, almost reaching us by the half way. Gum Nebula is believed to be old supernova remnant, which exploded about 1 million years ago. It means that the gas shell will reach us 1 million years after today, if we can assume that the expanding velocity is constant.
arctan 1/2 = 26.6 degrees, and angular diameter is 2 x 26.6 = 53 degrees, about 40 degrees in digits. The diameter looks to be equivalent to the calculated angle including the faintest parts.
Colin Gum reported the vast hydrogen-alpha region first in 1955. His sketch (1956) is visible here:
"Colin Gum and The Discovery of The Gum Nebula" by Kerr FJ 1971:
ntrs.nasa.gov/citations/19720004102
ntrs.nasa.gov/api/citations/19720004102/downloads/1972000...
Equipment: Sigma 35mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter or Clear Filter, and EOS R6-SP5, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 14 times x 60 seconds, 7 x 240 sec, and 8 times x 1,800 seconds at ISO 6,400 and f/3.2 with NB12 filter
6 times x 60 seconds, 6 x 240 sec, and 7 times x 900 seconds at ISO 1,600 and f/3.2 with clear filter
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
Gum Nebula was visible clearer in HII OIII starless version below:
www.flickr.com/photos/hiroc/53822710308
Equipment: Sigma 35mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter or Clear Filter, and EOS R6-SP5, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 14 times x 60 seconds, 7 x 240 sec, and 8 times x 1,800 seconds at ISO 6,400 and f/3.2 with NB12 filter
6 times x 60 seconds, 6 x 240 sec, and 7 times x 900 seconds at ISO 1,600 and f/3.2 with clear filter
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
Equipment: Sigma 35mmF1.4 DG HSM Art, Clear Filter, and EOS R6-SP5, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 6 times x 60 seconds, 6 x 240 sec, and 7 times x 900 seconds at ISO 1,600 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
Detail of faint parts got clearer after the starless conversion, though there remained trailed stars near the horizon and Canopus, bloated by thin clouds, encroached during the imaging sessions.
We can not see the big red nebula. It is too faint for our unaided eyes to feel directly, but we can feel the existence of Gum Nebula as a vast G-shaped dark part in the sky as below. It spans about 40 degrees. www.flickr.com/photos/hiroc/16311565540
Gum Nebula exists about 1kLY away from us, and the diameter is about 1kLY. It means that Gum Nebula is extremely large and incredibly close to us, almost reaching us by the half way. Gum Nebula is believed to be old supernova remnant, which exploded about 1 million years ago. It means that the gas shell will reach us 1 million years after today, if we can assume that the expanding velocity is constant.
arctan 1/2 = 26.6 degrees, and angular diameter is 2 x 26.6 = 53 degrees, about 40 degrees in digits. The diameter looks to be equivalent to the calculated angle including the faintest parts.
Equipment: Sigma 35mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R6-SP5, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 14 times x 60 seconds, 7 x 240 sec, and 8 times x 1,800 seconds at ISO 6,400 and f/3.2
Enlarged the frame at 200%, applied StarNet ++ v2.0 (finer tiles, total number of tiles 4,902), and restored back to 100%.
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
It was too late to take this object in May. The object was too low in the west, and a part of the frame got stars drifted due to differential atmospheric refraction. Atmospheric layer elevated stars near the horizon. North is up, and east is to the left.
We can not see the big red nebula. It is too faint for our unaided eyes. We can feel the existence of Gum Nebula as a vast G-shaped dark part in the sky as below. It spans about 40 degrees.
www.flickr.com/photos/hiroc/16311565540
Colin Gum reported the vast hydrogen-alpha region first in 1955. His sketch (1956) is visible here:
"Colin Gum and The Discovery of The Gum Nebula" by Kerr FJ 1971:
ntrs.nasa.gov/citations/19720004102
ntrs.nasa.gov/api/citations/19720004102/downloads/1972000...
We can not see Gum Nebula on "Atlas Coeli Skalnaté Pleso 1950.0" by Antonín Bečvář or on "Sky Atlas 2000.0" by Wil Tirion and Roger Sinnott, though Vela Supernova Remnant is on "Sky Atlas 2000.0." I have both big atlases. They are beautiful.
Equipment: Sigma 35mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R6-SP5, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 14 times x 60 seconds, 7 x 240 sec, and 8 times x 1,800 seconds at ISO 6,400 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
It was too late to take this object in May. The object was too low in the west, and a part of the frame got stars drifted due to differential atmospheric refraction. Atmospheric layer elevated stars near the horizon. North is up, and east is to the left.
We can not see the big red nebula. It is too faint for our unaided eyes. We can feel the existence of Gum Nebula as a vast G-shaped dark part in the sky as below. It spans about 40 degrees.
www.flickr.com/photos/hiroc/16311565540
Colin Gum reported the vast hydrogen-alpha region first in 1955. His sketch (1956) is visible here:
"Colin Gum and The Discovery of The Gum Nebula" by Kerr FJ 1971:
ntrs.nasa.gov/citations/19720004102
ntrs.nasa.gov/api/citations/19720004102/downloads/1972000...
We can not see Gum Nebula on "Atlas Coeli Skalnaté Pleso 1950.0" by Antonín Bečvář or on "Sky Atlas 2000.0" by Wil Tirion and Roger Sinnott, though Vela Supernova Remnant is on "Sky Atlas 2000.0." I have both big atlases. They are beautiful.
Equipment: Sigma 35mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R6-SP5, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 14 times x 60 seconds, 7 x 240 sec, and 8 times x 1,800 seconds at ISO 6,400 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
This is bi-color enhanced version. I put 70% of frame taken with clear filter on starless frame taken with dual narrow band filter.
Equipment: Sigma 105mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 18 times x 60 seconds, 12 x 240 sec, and 13 times x 1,800 seconds at ISO 6,400 and f/3.2 with NB12, Dual Narrow Band Filter
5 times x 60 seconds, 6 x 240 sec, and 9 times x 900 seconds at ISO 1,600 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
This is bi-color enhanced version. I put 70% of frame taken with clear filter on starless frame taken with dual narrow band filter.
Equipment: Sigma 105mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 18 times x 60 seconds, 12 x 240 sec, and 13 times x 1,800 seconds at ISO 6,400 and f/3.2 with NB12, Dual Narrow Band Filter
5 times x 60 seconds, 6 x 240 sec, and 9 times x 900 seconds at ISO 1,600 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
I always feel the shape like a cockroach or crab with big red eyes watching me.
There looked to be a beautiful circular filament of dark cloud near the center of the frame.
Equipment: Sigma 105mmF1.4 DG HSM Art, Clear Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 5 times x 60 seconds, 6 x 240 sec, and 9 times x 900 seconds at ISO 1,600 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
I always feel the shape like a cockroach or crab with big red eyes watching me.
There looked to be a beautiful circular filament of dark cloud near the center of the frame.
Equipment: Sigma 105mmF1.4 DG HSM Art, Clear Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 5 times x 60 seconds, 6 x 240 sec, and 9 times x 900 seconds at ISO 1,600 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
It took three nights to acquire the data. There look to be wide and faint extended part of filaments of oxygen-III emissions to the west. We may be able to image the part as fine network of oxygen-III emissions with telescopes of longer focal length, though it got far fainter or sparse after starless conversion. I hope to have chance to image the area with telescope. North is up, and east is to the left.
ROSAT image of the SNR was also wider toward west.
The Vela Supernova Remnant:
projects.mpe.mpg.de/heg/rosat/publications/highlights/vel...
Vela Pulsar, a neutron star rotates at period 0.089328 seconds.
The Sounds of Pulsars:
www.jb.man.ac.uk/~pulsar/Education/Sounds/sounds.html
Vela pulsar observed with the Parkes telescope in Australia:
www.jb.man.ac.uk/~pulsar/Education/Sounds/0835_seq.mp4
Equipment: Sigma 105mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 18 times x 60 seconds, 12 x 240 sec, and 13 times x 1,800 seconds at ISO 6,400 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
It took three nights to acquire the data. There look to be wide and faint extended part of filaments of oxygen-III emissions to the west. We may be able to image the part as fine network of oxygen-III emission with telescopes of longer focal length. North is up, and east is to the left.
ROSAT image was also wider toward west.
The Vela Supernova Remnant:
projects.mpe.mpg.de/heg/rosat/publications/highlights/vel...
Vela Pulsar, a neutron star rotates at period 0.089328 seconds.
The Sounds of Pulsars:
www.jb.man.ac.uk/~pulsar/Education/Sounds/sounds.html
Vela pulsar observed with the Parkes telescope in Australia:
www.jb.man.ac.uk/~pulsar/Education/Sounds/0835_seq.mp4
Equipment: Sigma 105mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 18 times x 60 seconds, 12 x 240 sec, and 13 times x 1,800 seconds at ISO 6,400 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
It took three nights to acquire the data. There look to be wide and faint extended part of filaments of oxygen-III emissions to the west. We may be able to image the part as fine network of oxygen-III emission with telescopes of longer focal length. North is up, and east is to the left.
ROSAT image was also wider toward west.
The Vela Supernova Remnant:
projects.mpe.mpg.de/heg/rosat/publications/highlights/vel...
Vela Pulsar, a neutron star rotates at period 0.089328 seconds.
The Sounds of Pulsars:
www.jb.man.ac.uk/~pulsar/Education/Sounds/sounds.html
Vela pulsar observed with the Parkes telescope in Australia:
www.jb.man.ac.uk/~pulsar/Education/Sounds/0835_seq.mp4
Equipment: Sigma 105mmF1.4 DG HSM Art, IDAS NB12 Dual Narrow Band Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5 Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 120MM-mini, and PHD2 Guiding
Exposure: 18 times x 60 seconds, 12 x 240 sec, and 13 times x 1,800 seconds at ISO 6,400 and f/3.2
site: 2,430m above sea level at lat. 24 38 55 South and long. 70 16 52 West near Cerro Armazones Chile
SQML was 21.55 at the night. Ambient temperature was around 6 degrees Celsius or 43 degrees Fahrenheit.
This is a framing of the vast Gum Nebula in the southern Milky Way, that sprawls over the constellations of Vela and Puppis. It is listed as object #12 in the catalog of southern nebulas compiled in the 1950s by Australian astronomer Colin Gum. It is perhaps a supernova remnant (not to be confused with the smaller Vela Supernova Remnant that is within the Gum Nebula) or is a large and old H-Alpha star-forming region. It is nearby in the Milky Way, at about 1500 light years from us. Smaller components of it carry other catalogue numbers such as Gum 15 and Gum 17.
At lower left is the Large Magellanic Cloud, a satellite galaxy to the Milky Way that is about 160,000 light years away. The LMC is marked with the bright Tarantula Nebula, NGC 2070, and other pink H-Alpha regions.
At top left is the rich region of the Carina Nebula, here somewhat lost amid the bright starclouds in that area of the Milky Way. Just left of centre are the stars of the False Cross from Carina and Vela, with the large naked-eye star cluster NGC 2516 below the Cross. The bright star at bottom is Canopus in Carina.
Technical:
This is a stack of 12 x 5 minutes at ISO 1600 and f/2 with the Astronomik 12nm H-alpha clip-in filter, blended onto the base set of unfiltered images from a stack of 14 x 3 minutes at f/2.8, all with the Canon RF28-70mm lens at 28mm on the red-sensitive Canon Ra camera, and on the MSM Nomad tracker. I blended in the monochrome H-Alpha stack using a Lighten blend mode and BlendIf adjustment, colourizing it with a Hue/Saturation clipped adjustment layer with settings: Hue = 342, Saturation = 40, and Lightness = -30 for a more natural pinker colouration and not a deep red.
I took this in March 2024 on an astrophoto excursion to Australia, shot from the Mirrabook Cottage near Coonabarabran, NSW.
This is the large Vela Supernova Remnant – visible here as the mostly cyan wisps and strands of starstuff from a star that exploded about 11,000 years ago when it was about 900 light years away. It would have been a spectacular sight in our sky at that time.
The nebula carries the designation of Gum 16, from the 1955 catalogue of Australian astronomer Colin S. Gum. The most distinct fragment of the Vela SNR visually is the Pencil Nebula, aka Herschel's Ray, or NGC 2736, the straight slash at left of centre.
The field, which measures 10º by 15º, contains several other Gum objects: at upper left is the large H-alpha region Gum 17 bisected by a dark lane SL4; the smaller circular patch above it is Gum 15; while the large diffuse nebula at top and cut off is RCW27, with the small NGC 2626 embedded in it. Below Gum 17 is the tiny RCW34 and larger and red RCW36 below it. Below the Pencil Nebula is the red Gum 23 or RCW 38.
The yellow star at upper left is Suhail, or Lambda Velorum. The blue star in the upper right corner is Naos, or Zeta Puppis. The blue star at lower right is Regor, aka Suhail al Muhlif, or Gamma Velorum, a hot blue giant star and one of the most luminous stars in the sky with an intrinsic brightness of some 180,000 Suns.
This is a stack of 15 x 2-minute exposures with the Canon RF135mm lens at f/2 on the Canon Ra at ISO 1000. It was tracked but not autoguided on the Astro-Physics AP 400 mount, taken March 12, 2024 from near Coonabarabran, NSW, Australia. Nebulosity enhanced using luminosity masked curves layers applied to a starless image layer created with RC-Astro StarXTerminator plug-in. Additional enhancements with the PhotoKemi Nebula Filter action and a Detail Extractor effect from the Nik Collection Color EFX plug-in.
Gum 15 located in the constellation of Vela, about 3,000 light-years from Earth.Shaped by aggressive winds flowing from the stars within and around it. The bright star in the center of the nebula is HD 74804, a double star.
In the southern hemisphere you can find the nebula GUM15. about 3000 light years away from us its an active starforming region with lots of ionized hydrogen. The blue star on the left is HIP 43073, some 744 ly from the earth.
Data fron TelescopeLive CHI-1 in Chile.19 hours of exposure.
Processed in PixInsight and Lightroom.
This beautiful nebula is located in the constellation of Vela, about 3,000 light-years from Earth. Its rich red glowing cloud is an impressive example of an HII region formed by fierce interstellar winds flowing from the stars around and within. HII emissions remind me of neon lights, glowing off in the distance. Ridges within the nebula, folding over one another creating glowing highlights seem to reach outwards. I have always liked reflection nebula, and this nebula seems to have subtle wisps of dusty blue streamers running throughout. Scattering and reflecting blue light towards us.
Several dark dusky areas are present throughout the nebula. They always seem to add an element of depth. This object is catalogued as Gum 15. It is similar to the Trifad Nebula in appearance with the dark cavernous areas.
The bright star in the centre of the nebula is HD 74804, a double star.
Exposure Details:
Red 23 X 600
Green 18 X 600
Blue 18 X 600
Lum 66 X 600
Ha 24 X 1200
Total Exposure: 28.8 Hours
Instruments:
Telescope: 10" Ritchey-Chrétien RCOS
Camera: SBIG STL-11000 Mono
Mount: Astro-Physics AP-900
Focal Length: 2310.00 mm
Pixel size: 9.00 um
Resolution: 0.82 arcsec/pix
Thanks for looking
Gum 15 star formation region
Image source: ESO
Design: @alexbiebricher