Reprocess of old M101 data
Using new techniques. Looks a bit nicer now.
M101 and SN 2023ivx
Closest and brightest supernova for over a decade. Using a Triband filter to reduce twilight glare. ASTAP measurement gives me a supernova mag. of 11.3.
| Object ID | M101 Supernova 2023ivx |
| Details | 2023-05-24 32:15 UT (mid) |
| Telescope | 250mm f4.8 Newtonian MPCC |
| Camera | QHY168C @-10°C |
| Filters | Altair triband |
| Exposure(s) | 10 x 300s |
| Capture | NINA |
| Processing | APP, Photoshop |
M100 (NGC 4321
A grand design spiral galaxy in Coma Berenices, 55 million light years away and part of the Virgo cluster.
V and R filters used
| Object ID | M100, NGC 4321 Coma Berenices 7.4′ x 6.3′ Mag. 9.5 |
| Details | 2022-03-20 |
| Telescope | 250mm f4.8 Newtonian R, V filters |
| Camera | Atik 460EX @-10 °C |
| Exposure(s) | 20 x 180s V 20 x 180s R d,f,b |
| Capture | NINA |
| Processing | APP, Photoshop |
M101 Pinwheel Galaxy
| Object ID | M101 Ursa Major |
| Details | Mag. 7.8 Size 28′.8 × 26′.9 |
| Telescope | 250mm f4.8 Newtonian MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 30x180s 10/50 gain/offset darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz DeNoise AI |
M95, M96
| Object ID | M95, M96 Leo |
| Details | 2021-02-14 Mag. 11.4 // 10.1 Size 3.1’x2.9′ // 7.6’x5.2′ |
| Telescope | 250mm f4.8 Newtonian MPCC |
| Camera | QHY168C @-15°C IDAS P2 |
| Exposure(s) | 15x240ss 2/20 gain/offset darks, flats, bias |
| Capture | NINA |
| Processing | APP, Photoshop, Topaz Denoise AI |
M92 (NGC 6341)
240s exposures in each of RGB this time instead of my usual 180s. Strong moonlight though but APP dealt with the gradients pretty well. Much deeper into the fainter stars.
| Object ID | M13 Globular, Hercules NGC 6341 |
| Details | Mag 6.3 Size 14′ |
| Telescope | 250mm f4.8 Newtonian |
| Camera | Atik 460EX @-15C |
| Exposure(s) | 5x240s ea RGB draks, flats, bias |
| Capture | APT |
| Processing | APP, Photoshop |
M101 (NGC 4321)
Added twice as many frames as normal – still noisy. Probably need longer exposures. Bad gradients needed a lot of work in APP.
UPDATE: Used the demo versions of TOPAZ DeNoiseAI and it makes a huge difference. Removes noise without removing details. Other de-noising seems to just blur features – this is far more intelligent.
| Object ID | M101, NGC 4321 |
| Details | Spiral galaxy, Ursa Major Mag. 9.5 Size 7.4’x6.3′ |
| Telescope | 250mm f4.8 Newtonian |
| Camera | Atik 460EX @-15C |
| Exposure(s) | 20x180s each RGB darks, flats, bias |
| Capture | APT |
| Processing | APP, Photoshop |
M106 (NGC 4258)
Poor transparency and gradients from passing headlamps. NGC 4248 also in view.
| Object ID | M106 (NGC 4258) Ursa Major |
| Details | 2019-03-04 |
| Telescope | 250mm f4.8 Newtonian IDAS P2 filter |
| Camera | Atik 460EX, Baader RGB |
| Exposure(s) | 10 x 120s each filter darks |
| Capture | APT |
| Processing | Nebulosity, Photoshop |
M103 (NGC 581)
Tighter open cluster, quite remote at 8,000 light years away.
| Object ID | M103 (NGC 581) Open cluster Cassiopeia Mag. 7.4, Size 6′ |
| Details | 2018-09-08 Not very transparent. |
| Telescope | 200mm f5 Newtonian, MPCC IDAS P2 LPR filter Guiding c80ED, ASI 290MC |
| Camera | Canon 600D |
| Exposure(s) | 10x60s, darks and flats |
| Capture | APT, PHD |
| Processing | Nebulosity, Photoshop |
M101 (NGC 5457) Pinwheel Galaxy
Galaxy, Ursa Major
Mag 7.86 Size 28?.8 × 26?.9
2017-03-25
200mm f8 RC
Piggyback guiding with 70mm f/7 refractor
L 20×240s 2×2, RGB 10×120s 4×4 Darks Bias Flats
Atik 460EX (-24C), LRGB filters, IDAS P2 LPR filter
Captured in APT, Processed in Nebulosity3, PS CC, LightRoom
Horrible gradients again. I suspect collimation and camera alignment need some work.
M101 is a large galaxy comparable in size to the Milky Way. With a diameter of 170,000 light-years it is roughly equal the size of the Milky Way. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses.
M101 is noted for its high population of H II regions, many of which are very large and bright. H II regions usually accompany the enormous clouds of high density molecular hydrogen gas contracting under their own gravitational force where stars form. H II regions are ionized by large numbers of extremely bright and hot young stars; those in M101 are capable of creating hot superbubbles. In a 1990 study, 1264 H II regions were cataloged in the galaxy. Three are prominent enough to receive New General Catalogue numbers – NGC 5461, NGC 5462, and NGC 5471.
M101 is asymmetrical due to the tidal forces from interactions with its companion galaxies. These gravitational interactions compress interstellar hydrogen gas, which then triggers strong star formation activity in M101’s spiral arms that can be detected in ultraviolet images.
In 2001, the x-ray source P98, located in M101, was identified as an ultra-luminous X-ray source – a source more powerful than any single star but less powerful than a whole galaxy – using the Chandra X-ray Observatory. It received the designation M101 ULX-1. In 2005, Hubble and XMM-Newton observations showed the presence of an optical counterpart, strongly indicating that M101 ULX-1 is an x-ray binary. Further observations showed that the system deviated from expected models – the black hole is just 20 to 30 solar masses, and consumes material (including captured stellar wind) at a higher rate than theory suggests.
M97 (NGC 3587) Owl Nebula
Planetary Nebula, Ursa Major, Owl Nebula
Mag 9.9, size 3.4’x3.3′
2017-02-28
200mm f8 RC
Piggyback guiding with 70mm f/7 refractor
L 22×240s 2×2, RGB 11×120s 4×4 Darks Bias Flats
Atik 460EX (-25C), LRGB filters, IDAS P2 LPR filter
Captured in APT, Processed in Nebulosity3, PS CC, LightRoom
The Owl Nebula (also known as Messier 97, M97 or NGC 3587) is a planetary nebula located approximately 2,030 light years away in the constellation Ursa Major. It was discovered by French astronomer Pierre Méchain on February 16, 1781. When William Parsons, 3rd Earl of Rosse, observed the nebula in 1848, his hand-drawn illustration resembled an owl’s head. It has been known as the Owl Nebula ever since.
The nebula is approximately 8,000 years old. It is approximately circular in cross-section with a little visible internal structure. It was formed from the outflow of material from the stellar wind of the central star as it evolved along the asymptotic giant branch. The nebula is arranged in three concentric shells, with the outermost shell being about 20–30% larger than the inner shell. The owl-like appearance of the nebula is the result of an inner shell that is not circularly symmetric, but instead forms a barrel-like structure aligned at an angle of 45° to the line of sight.
The nebula holds about 0.13 solar masses of matter, including hydrogen, helium, nitrogen, oxygen, and sulfur; all with a density of less than 100 particles per cubic centimeter. Its outer radius is around 0.91 ly (0.28 pc) and it is expanding with velocities in the range of 27–39 km/s into the surrounding interstellar medium.
The 14th magnitude central star has since reached the turning point of its evolution where it condenses to form a white dwarf. It has 55–60% of the Sun’s mass, 41–148 times the brightness of the Sun, and an effective temperature of 123,000 K. The star has been successfully resolved by the Spitzer Space Telescope as a point source that does not show the infrared excess characteristic of a circumstellar disk.
Wikipedia
M96 (NGC 3368)
Spiral Galaxy Leo
Mag. 10.1, size 7.6′ x 5.2′
2014-03-24
200mm f8 RC, piggyback guiding C80ED
10×120, 20×180 ISO 1600, darks, flats
Canon EOS 350D modded, Astronomik CLS
Captured in APT, Processed in Nebulosity, PS CS5
Not a great night or image. Needed longer subs but sky wouldn’t allow.
M101 (NGC 5457)
Galaxy, Ursa Major
Mag 7.86 Size 28?.8 × 26?.9
2013-05-01
200mm f8 RC, piggyback guiding C80ED
10×120 10×180 10×240 ISO 1600, darks, flats
Canon EOS 350D modded, Astronomik CLS
Captured in APT, Processed in Nebulosity, PS CS5
M97 (NGC 3587)
Planetary Nebula, Ursa Major, Owl Nebula
Mag 9.9, size 3.4’x3.3′
2011-03-07
200mm f5 Newtonian MPCC Guided
Canon EOS 350D, Astronomik CLS
10x180s 5x240s darks ISO 800
Processed in Nebulosity and PS CS5
M92 (NGC 6341)
Globular Cluster, Hercules
Mag 6.4 Size 14′
2010-09-09
200mm f5 Newtonian, Canon 350D
Guided, SW LPR filter, MPCC
10x60s, 10x180s subs, darks
Processed in Nebulosity and PhotoShop CS5
M110 (NGC 205)
Elliptical Galaxy, AndromedaMag 8.5 Size 17’x10′
2009-08-17
C80ED f7.5, Canon EOS 350D, DS Filter, Guided
5x120s 5x180s subs
Stacked in Nebulosity, Processed in PhotoShop CS3
On the same frame as M31 and M32
M103 (NGC 581)
Open Cluster, Cassiopeia
Mag 7.4, Size 6.0′
2009-08-05
Subs: 10x60s Dark: 10x60s
C80ED Canon EOS 350D guided Deep Sky Filter
Processed in Nebulosity and PhotoShop CS3