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IC 1805 and Melotte 15. |
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IC 1805 and Melotte 15. |
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The Iris Nebula in modified SHO format. The PIRATE Robotic Telescope,Mount Teide, Teneriffe. Data Credit: telescope.org. Open Observatories, Open University. Image Credit: Kurt Thrust. |
" Kurt was feeling a little better today and so he and the JPO engineer, Jolene McSquint-Fleming, were busy remaking a diffraction grating for the Seestar S30. They decided to make a grating, which covers the full aperture of the little scope rather than partially. It will be interesting to see whether this affects the accuracy of the scope's guidance and goto software". - Joel Cairo CEO at the JPO.
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The new-recycled magnetic 50 lines/mm full aperture grating for the Seestar 30 |
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Spectrum produced by the above grating using the JPO Visitor Centre door security peep hole as an artificial star. |
The North America and Pelican Nebulae in the Constellation Cygnus. Image credit: Kurt Thrust at the JPO |
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NGC 281- Part of the Pac-man Nebula. Data Credit: PIRATE robotic telescope, SHO filters, Mount Teide, Tenerife. telescope.org. Open Observatories, Open University. Image Credit: Kurt Thrust. |
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Messier 31 The Andromeda Galaxy Group. Altair Lightwave 66mm ED refractor and Canon 600d DSLR. Image Credit Kurt Thrust. |
"Our nearest spiral galaxy neighbour the Andromeda Galaxy is riding high in the Northern Hemisphere autumn sky. The weather has been far from kind and the JPO team has been laid low by a rather nasty virus which may be the latest variant of Covid. Anyway, as the team has been wrapped up warm for a while, Kurt decided to reprocess this data captured in a previous year.
The above image shows the three galaxies M31 (the large central inclined spiral), M32 the elliptical galaxy (appears as a fuzzy spot on the upper edge of the M31 spiral) and M110 a dwarf elliptical galaxy ( just below and to the centre right of M31).
So let Professor G.P.T. Chat, our visiting astrophysicist, compare and contrast these nearby galaxies (approximately 2.5 million light years distant) with our home Milky Way galaxy". - Joel Caio CEO of the Jodrell Plank Observatory.
Milky Way – Our Home Galaxy
The Milky Way is itself a barred spiral galaxy, somewhat smaller than M31. Its disk extends ~100,000–120,000 light-years, with a mass of about 1 trillion solar masses and a few hundred billion stars. Structurally, it resembles M31: both have stellar halos, bulges, bars, spiral arms, and satellite galaxies. In cosmic terms, the Milky Way is the second major member of the Local Group, and the future collision and merger of the Milky Way and M31 will reshape them into a single giant elliptical galaxy in several billion years.
M31 – The Andromeda Galaxy
Andromeda is the giant of this quartet. With a disk spanning about 220,000 light-years, it is roughly twice the diameter of the Milky Way. Its stellar population approaches one trillion, compared with the Milky Way’s 200–400 billion. In both size and luminosity, M31 slightly outclasses our own Galaxy, and it exerts enough gravitational pull to dominate the Local Group, which also contains the Milky Way and dozens of smaller galaxies.
Notes: A vast spiral galaxy with an extensive stellar halo and a large, bright disk. It dominates the Local Group both in size and gravitational influence.
M32 – Compact Elliptical
Placed against the scale of the Milky Way, M32 looks minuscule. With only ~3 billion stars in a body just 6,500 light-years across, it is smaller than even some of the Milky Way’s largest globular clusters when measured by diameter. Where the Milky Way’s spiral disk is rich in gas and dust and actively forming stars, M32 is stripped bare, almost entirely quiescent. Its compact, blazing core makes it bright for its size, but compared with the Milky Way, it is less than 1% as luminous.
Notes: Dense and bright, especially in its central regions. Its outer stars and gas are thought to have been stripped by M31, leaving only the compact core we see today.
M110 – Dwarf Elliptical
M110 sits somewhere between M32 and the Milky Way in scale. Its 15,000–17,000 light-year span is still tiny compared with the Milky Way’s disk, and its ~10 billion stars are a mere fraction of the Milky Way’s population. Unlike M32, however, M110 retains some irregular features, dust, and evidence of star formation. It is a faint satellite, thousands of times less luminous than the Milky Way, but still large enough to stand as one of the more substantial dwarf galaxies in the Local Group.
Notes: More diffuse than M32, with some evidence of dust lanes and past star formation. Its structure is irregular compared with typical smooth ellipticals, likely reflecting tidal interaction with M31.
Comparative Perspective
M31 and the Milky Way are the two great spirals of the Local Group, differing mainly in scale (M31 being the larger).
M32 is a stripped-down remnant, a tiny elliptical companion of M31, utterly dwarfed by both the Milky Way and Andromeda.
M110 is a diffuse dwarf elliptical, more extended than M32 but still only a faint shadow of the Milky Way’s scale and richness.
Together, these four galaxies illustrate the hierarchy of galactic forms: two massive spirals shaping the Local Group, orbited by much smaller companions that bear the scars of their gravitational relationship with the giants.
The Milky Way and M31 are moving toward each other at about 110 km/s.
In roughly 4–5 billion years, their outer halos will begin to overlap, triggering the first close passage.
The collision will not be like two solid bodies smashing together; instead, stars will mostly pass by one another because of the vast spaces between them. But gas, dust, and dark matter halos will interact strongly, producing shocks, bursts of star formation, and tidal distortions.
After a series of close encounters, the Milky Way and M31 will merge into a single giant elliptical galaxy — sometimes nicknamed “Milkomeda” or “Milkdromeda.”
This process will take several billion years to settle into a stable form. The final product will likely resemble today’s giant elliptical galaxies, with a vast stellar halo and little organized spiral structure.
M32, already stripped and compact, is tightly bound to M31.
During the merger, it will almost certainly be swallowed whole by the combined Milky Way–Andromeda system.
Its compact nature means it will survive tidal forces fairly well, likely ending as a dense nucleus or central star cluster within the merged galaxy.
M110, being larger and more diffuse, will fare differently.
It may be torn apart by tidal forces during the merger, with its stars spread out into long stellar streams and absorbed into the halo of the new galaxy.
Some fraction of its stars may survive as a remnant dwarf core, but it will be much more disrupted than M32.
The Local Group will transform from a system dominated by two spirals into a single elliptical super-galaxy, containing perhaps 2 trillion stars.
The smaller companions, including M32, M110, and the Milky Way’s own satellites (like the Magellanic Clouds), will either be absorbed into the giant remnant or left orbiting as faint shells and streams.
From a cosmic distance, the Local Group will eventually resemble a single luminous elliptical galaxy, drifting in relative isolation as the universe continues to expand.
In short: M31 and the Milky Way will merge into one great elliptical galaxy; M32 will likely become part of its core, while M110 will be torn apart and assimilated into its halo.
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The Globular Star Cluster Messier 71. Data Credit: PIRATE robotic telescope, BVR filters. Mount Teide, Tenerife. telescope.org. Open Observatories, Open University. Image Credit: Kurt Thrust at the JPO. |
" Messier 71, sits in the small constellation Sagitta the arrow. This area of the sky is associated with the plane of the Milky Way's disc and is literally awash with stars when viewed with binoculars or a widefield telescope. Messier 71 being a small globular cluster, is therefore easy to miss within this plethora of stars. As I processed the data and watched the above image materialise, I was amazed at how many stars I could see!" - Kurt Thrust current Director of the Jodrell Plank Observatory.
A Comparative Report on the Globular Cluster Messier 71
Messier 71 (M71), located in the small constellation Sagitta, is one of the more unusual globular clusters in the Messier catalogue. At a distance of roughly 13,000 light-years, it appears as a loose, irregular grouping of stars through modest telescopes, and for much of the 19th and 20th centuries it was debated whether M71 was in fact a globular or a rich open cluster. Advances in stellar photometry and spectroscopy have since clarified its nature: M71 is a genuine globular cluster, though a relatively low-mass, metal-rich, and loosely concentrated one. Comparison with the more archetypal clusters Messier 13 (M13), Messier 3 (M3), and Messier 4 (M4) underscores the peculiarities of M71.
Messier 13, the “Great Hercules Cluster,” is perhaps the best-known northern globular cluster. It contains several hundred thousand stars in a compact halo over 140 light-years across, with a dense, bright core that exemplifies the globular class. By contrast, M71 contains perhaps only 20,000–50,000 stars spread across a mere 27 light-years. Its lower concentration and modest size explain why early observers mistook it for an open cluster. Whereas M13 presents a dazzling display of densely packed stars and exhibits a well-defined horizontal branch, M71 has only a stubby red giant branch and no extended blue horizontal branch, making its stellar population appear more subdued.
Messier 3 provides another instructive comparison. Situated in Canes Venatici, M3 is among the richest and most extensively studied globular clusters, hosting over half a million stars and more than 200 known variables, including numerous RR Lyrae stars. Its variable population and prominent horizontal branch have made it a cornerstone for calibrating stellar evolution models. M71, on the other hand, lacks a significant RR Lyrae population and is chemically distinct. Its relatively high metallicity ([Fe/H] ≈ –0.8) is atypical for globular clusters, especially when contrasted with the metal-poor stars of M3. This implies that M71 formed later in the Galactic halo’s history, from interstellar gas already enriched with heavier elements, and therefore represents a younger evolutionary epoch within the globular cluster system.
Messier 4, in Scorpius, provides a comparison from the opposite end of the structural spectrum. Though M4 is one of the closest globular clusters to Earth (about 7,200 light-years), and not especially rich in stars compared to giants like M3 or M13, it nevertheless displays a clear globular morphology with a strong central concentration. M4 is notable for its rich population of evolved stars, a well-populated horizontal branch, and chemical peculiarities linked to multiple stellar generations. In terms of mass and richness, M4 is closer to M71 than are M13 or M3, yet it retains the compact, globular appearance that M71 lacks. The difference lies primarily in concentration: M4 is compact and easily recognisable as a globular cluster, while M71 is diffuse, giving it a hybrid appearance that complicated its classification.
In conclusion, M71 highlights the diversity within the globular cluster family. It lacks the immense stellar density and archetypal morphology of Messier 13, the vast population and chemical simplicity of Messier 3, and even the structural clarity of Messier 4. Instead, it is a relatively loose, metal-rich, and moderately populated globular cluster, whose transitional characteristics blur the distinction between open and globular clusters. Its study provides valuable insight into the chemical enrichment of the Galaxy and the lower-mass limits of globular cluster formation.
Professor G.P.T. Chat visiting astrophysicist at the Jodrell Plank Observatory.
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NGC 7380 The Wizard Nebula in the constellation Cepheus. Data Credit: PIRATE robotic telescope, SHO filters. Mount Teide. Tenerife telescope.org. Open Observatories, Open University. Image Credit Pip Stakkert at the JPO. |
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Annotated version of the image. Credit: astrometry.net. |
" Pip has taken his own view on the final colours used in this narrow band image. The original data was captured with SHO filters which were mapped to RGB. Hydrogen alpha emission is particularly strong in NGC7380 and therefore 'green' predominates. Pip has adjusted the colour intensity to bring out the 'red' (Sulphur ll) and blue (Oxygen lll) datas".
I should like to thank Alan Waffles and Waffles Construction Ltd for coming at short notice, to batten down one of the rooves at the JPO, prior to the arrival of high winds and heavy rain. In the event, the storm wasn't as bad as was predicted and no damage was sustained".- Joel Cairo CEO of the Jodrell Plank Observatory.
" I asked Karl Segin, the JPO's outreach officer and Professor G.P.T Chat our visiting astrophysicist, to put together a brief description of the Wizard Nebula. I hope, like me, you find this enigmatic object interesting" - Kurt Thrust current Director of the Jodrell Plank Observatory.
NGC 7380: The Wizard Nebula
NGC 7380, commonly referred to as the Wizard Nebula, is a young open star cluster surrounded by an extensive emission nebula. It is located in the constellation Cepheus, at an estimated distance of about 7,200 light-years from Earth. The nebula spans approximately 100 light-years across, making it a prominent star-forming region visible in long-exposure astrophotography. Its popular name arises from the resemblance of the illuminated gas clouds to a robed, wizard-like figure when viewed in visible light images.
The central feature of NGC 7380 is the open star cluster, cataloged by Caroline Herschel in 1787 and later added to William Herschel’s general catalog. This cluster is only a few million years old and contains a rich population of hot, massive O-type and B-type stars, whose strong ultraviolet radiation energizes the surrounding hydrogen gas. The nebula itself is classified as an H II region, a vast cloud of ionized hydrogen where new stars are actively forming.
The process that created the Wizard Nebula follows the standard sequence of stellar nursery evolution. A large molecular cloud of hydrogen and trace elements began to collapse under the influence of its own gravity. Local density enhancements triggered pockets of rapid star formation. As the most massive stars ignited nuclear fusion in their cores, they released intense radiation and powerful stellar winds. This feedback carved cavities in the surrounding cloud, compressing some regions while dispersing others. The result is the sculpted appearance of bright ridges, dark dust lanes, and filamentary structures that give the nebula its dramatic shape.
Embedded within the nebula are protostars and young stellar objects still accreting matter from their natal environment. Observations in infrared wavelengths, which can penetrate the obscuring dust, have revealed numerous stars still in their formative stages. Some of these may eventually join the cluster, while others will disperse as the nebula continues to evolve.
The fate of NGC 7380 will be shaped by its most massive stars. Within a few million years, these stars will end their lives as supernovae, enriching the interstellar medium with heavy elements and possibly triggering further rounds of star formation in the region. Over time, the gas and dust of the Wizard Nebula will disperse into the wider galaxy, leaving behind the open cluster, which itself will gradually lose cohesion due to gravitational interactions.
Today, NGC 7380 is an object of great interest to both professional astronomers and astrophotographers. It provides a natural laboratory for studying the physics of star formation, stellar feedback, and nebular evolution. Its striking appearance, combined with its role as an active stellar nursery, makes the Wizard Nebula one of the most evocative examples of the dynamic processes shaping our Milky Way galaxy.