AAPOD2 Image Archives

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2025, March 2025 Charles Lillo 2025, March 2025 Charles Lillo

Echoes of a Stellar Cataclysm: Supernova SNR 206.9+2.3

Nestled within the vast expanse of the Large Magellanic Cloud (LMC), Supernova Remnant SNR 206.9+2.3 stands as a ghostly reminder of a massive star’s violent demise. This delicate yet intricate nebular structure, spanning nearly 130 light-years across, is the expanding shell of gas and dust left behind by a colossal stellar explosion. The supernova that birthed this remnant occurred tens of thousands of years ago, and its shockwave continues to ripple outward, interacting with the surrounding interstellar medium.

Captured through deep imaging using a personal telescope setup, this stunning portrait of SNR 206.9+2.3 reveals its rich and complex composition. Using narrowband filters, the image highlights key elements ejected during the explosion:

  • Hydrogen-alpha (Hα) in deep reds, tracing vast, glowing filaments of ionized gas.

  • Oxygen-III (OIII) in striking blues and greens, marking the high-energy zones where the shockwave excites interstellar material.

  • Sulfur-II (SII) in golden hues, unveiling denser, cooler regions sculpted by turbulence and radiation.

Supernova remnants like SNR 206.9+2.3 play a crucial role in the cosmic cycle, enriching their surroundings with heavy elements—such as oxygen, carbon, and iron—that will eventually become the building blocks of future stars, planets, and even life itself.

This breathtaking image, the result of careful planning and dedicated observation, is a testament to the power of amateur astrophotography in unveiling the hidden wonders of the universe.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

The Pencil Nebula

The Pencil Nebula (NGC 2736), a brilliant filamentary structure in the Vela Supernova Remnant, is a striking testament to the power of a stellar explosion that occurred nearly 11,000 years ago. Situated 800 light-years away in the constellation Vela, this nebula is a fragment of the vast shockwave created when a massive star met its violent demise in a supernova.

Captured in a combined LRGB and SHO palette, this image unveils the intricate layers of ionized gas sculpted by the expanding remnant:

  • LRGB (Luminance, Red, Green, Blue) brings out the natural star colors and depth, emphasizing the nebula’s place within the galactic starfield.

  • Sulfur-II (SII) in deep reds and oranges reveals cooler, ionized gas pockets shaped by the passage of the shockwave.

  • Hydrogen-alpha (Hα) in golden yellows highlights the vast, ionized filaments weaving through the nebula.

  • Oxygen-III (OIII) in striking blue-greens traces the hotter, high-energy regions, marking areas where the supernova's blast wave continues to excite the surrounding interstellar medium.

Spanning nearly 5 light-years across, the Pencil Nebula moves at an astonishing speed of 650,000 km/h (400,000 mph) as it carves through space. The sharply defined, curving filaments contrast against more diffuse, wispy structures, a visual representation of the turbulent forces at play in this cosmic relic.

This multi-channel imaging approach reveals the nebula’s complex structure in unprecedented detail, showcasing the raw power of stellar death and the ongoing interactions that shape the interstellar medium. Over millennia, the nebula will continue to fade, dispersing its enriched materials into space, seeding the next generation of stars in a never-ending cycle of cosmic evolution.

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2025, March 2025 Charles Lillo 2025, March 2025 Charles Lillo

Discovery of a hidden SNR in Gemini, G195.8+02.3

Amid the vast starfields of the constellation Gemini, a long-lost stellar explosion has finally been unveiled—G195.8+02.3, a previously unknown supernova remnant (SNR), lurking in the interstellar medium for thousands of years. This faint and diffuse structure, revealed through an astonishing 315+ hours of imaging in just 19 days, stands as a testament to the dedication and skill of seven astrophotographers who worked relentlessly to bring this cosmic ghost into view.

Supernova remnants are the echoes of cataclysmic stellar deaths, where a massive star, having exhausted its nuclear fuel, ends its life in a violent explosion, expelling its outer layers into space at tremendous velocities. Over millennia, these remnants expand, their shockwaves interacting with the surrounding gas, shaping intricate filaments, and leaving behind a cosmic footprint of the star’s final moments.

The discovery of G195.8+02.3 highlights the power of deep narrowband imaging, which has uncovered the faint tendrils of ionized gas that remained undetected in past surveys. The intricate web of hydrogen-alpha () emissions, along with subtle traces of oxygen (OIII) and sulfur (SII), paints a haunting picture of this remnant as it slowly dissipates into the interstellar medium.

This finding enriches our understanding of the lifecycle of stars and the dynamic processes shaping the Milky Way. It also showcases the remarkable achievements possible through collaborative astrophotography—where dedication, skill, and cutting-edge imaging techniques continue to unveil the hidden wonders of our universe.

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2025, March 2025 Charles Lillo 2025, March 2025 Charles Lillo

CRESCENT GIBBOUS MOON REVEALS ITS MINERALS

The Crescent Gibbous Moon, bathed in sunlight, unveils a spectacular display of its hidden mineral diversity, revealing a lunar landscape painted in subtle yet scientifically significant hues. While the Moon often appears monochromatic to the naked eye, specialized imaging techniques bring out the geological secrets of its surface, showcasing the distribution of various elements across its rugged terrain.

This enhanced image, captured using mineral mapping techniques, highlights the Moon’s crustal composition in vivid detail. The blue and violet tones indicate areas rich in titanium-bearing basalts, found primarily in the lunar maria, vast plains formed by ancient volcanic activity. In contrast, the reddish and brown hues trace the presence of iron-rich materials and highland regions composed of anorthosite—a mineral abundant in aluminum that forms the Moon’s ancient crust.

The transition from the illuminated portion to the dark lunar terminator offers a breathtaking contrast, revealing long, jagged shadows cast by crater walls and towering mountain ranges. This interplay of light and shadow enhances the dramatic topography of impact craters, ridges, and volcanic plains, offering a glimpse into the Moon’s violent past shaped by asteroid impacts and internal geological activity.

By utilizing multispectral imaging and color enhancement, this image transforms the Moon from a familiar celestial neighbor into a richly textured and scientifically revealing world—one whose mineral composition provides key insights into the history of our solar system and the processes that shaped planetary bodies.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

Cone to Rosette Nebula SHO - 4 Panel Mosaic

Spanning hundreds of light-years across the Monoceros constellation, this stunning 4-panel mosaic captures the vast and intricate connection between two iconic nebulae—the Cone Nebula (NGC 2264) and the Rosette Nebula (NGC 2237)—revealing their structure in exquisite Sulfur-II (SII), Hydrogen-alpha (Hα), and Oxygen-III (OIII) narrowband detail.

On the left, the towering Cone Nebula, shaped by intense stellar winds and radiation, stands like a shadowy pillar of interstellar dust and ionized gas. This dark structure, nearly 7 light-years tall, is being slowly eroded by the ultraviolet light of nearby young, hot stars in the Christmas Tree Cluster, carving out glowing ridges and intricate filaments of gas.

Stretching toward the right, the Rosette Nebula dominates the scene with its vast, circular structure—an enormous star-forming complex located about 5,000 light-years away. At its heart lies the open cluster NGC 2244, whose blazing young stars flood the nebula with ultraviolet radiation, ionizing the surrounding gas and sculpting a luminous cavity filled with intricate tendrils of material. The nebula’s layered appearance reveals shock fronts, dark dust lanes, and vast plumes of ionized gas driven outward by stellar feedback.

This SHO palette brings out the nebulae’s complex composition: sulfur (SII) in deep red-orange hues, hydrogen-alpha (Hα) in golden-yellow tones, and oxygen (OIII) in striking blue-greens, highlighting the energetic processes shaping these celestial structures. The seamless blending of this 4-panel mosaic unveils a breathtaking connection between these regions, illustrating the turbulent yet beautiful cycle of star formation and destruction that defines the Milky Way’s vast stellar nurseries.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

NGC 2292 and NGC 2293: A Galactic Merger Enshrouded in Dust

Deep within the constellation Canis Major, a cosmic ballet unfolds as two massive galaxies—NGC 2292 and NGC 2293—engage in a slow yet dramatic merger. This interacting pair, located approximately 120 million light-years away, presents a fascinating case of galactic evolution, where the chaotic forces of gravity and time are reshaping their structure into what may eventually become a single, massive elliptical galaxy.

Unlike many well-known mergers that showcase prominent tidal tails and distorted spiral arms, this galactic duo is heavily enshrouded in thick dust lanes, obscuring much of the inner turmoil. NGC 2292 is classified as a lenticular galaxy, while NGC 2293 appears to be a more massive spiral. However, as they coalesce, their once-distinct morphologies are fading, leaving behind an expanding halo of stars and a central bulge that hints at their shared fate.

The dense dust and gas surrounding the merging cores suggest intense star formation may still be taking place, hidden from optical view. Infrared observations have revealed signs of a central bar-like structure forming, a common precursor to the final stages of galactic unification. Meanwhile, dark filaments crisscross the galaxies, remnants of disrupted material still settling into a new gravitational equilibrium.

This image captures the subtle yet striking details of NGC 2292 and NGC 2293 in visible light, revealing the eerie glow of starlight filtering through cosmic dust—a silent witness to the slow but inevitable fusion of two ancient stellar islands. In millions of years, what remains may be a massive, quiescent elliptical galaxy, a testament to the ceaseless cycle of cosmic creation and destruction.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

Merope Nebula & IC 349

Nestled within the brilliant glow of the Pleiades star cluster (Messier 45), the Merope Nebula (NGC 1435) and its elusive companion, IC 349 (sometimes called Barnard's Merope Nebula), offer a mesmerizing glimpse into the intricate dance between starlight and interstellar dust.

The Merope Nebula is a striking reflection nebula, its delicate wisps of dust illuminated by the brilliant blue-white star Merope, one of the brightest members of the Pleiades. Unlike emission nebulae that glow due to ionized gases, reflection nebulae simply scatter and reflect starlight, creating an ethereal blue glow. The fine, thread-like structures seen in this image are the result of complex interactions between radiation pressure, magnetic fields, and the movement of interstellar material.

Lying just 0.06 light-years (or 13,000 AU) from Merope, IC 349 is a tiny but incredibly bright knot of dust, appearing almost like a cometary streak in deep images. First observed by E.E. Barnard in 1890, this compact cloud is being sculpted by the intense radiation and stellar winds from Merope, causing its structure to evolve in real time on astronomical scales.

This high-resolution image, enhanced with LRGB data, brings out the finest details of the nebula’s structure—revealing the turbulence, filaments, and interplay of light that make this region of the Pleiades one of the most visually stunning in the sky.

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2025, March 2025 Charles Lillo 2025, March 2025 Charles Lillo

The OWL Nebula

Drifting in the constellation Ursa Major, Messier 97 (M97), commonly known as the Owl Nebula, is one of the most well-defined planetary nebulae in the night sky. Located approximately 2,000 light-years away, this cosmic apparition represents the final stages of a dying Sun-like star, shedding its outer layers into space and leaving behind a hot, compact white dwarf at its core.

The Owl Nebula spans about 3 light-years across, with an intricate shell of glowing gas expanding outward at roughly 40 km/s. In this HaLRGB image, the deep hydrogen-alpha () emissions reveal the nebula’s faint outer structures, while the luminous oxygen (OIII) and sulfur (SII) emissions add layers of complexity, painting a vivid portrait of this celestial ghost.

Its famous “owl-like” appearance arises from two large, dark voids in its inner shell, thought to be the result of complex stellar winds and asymmetric ejections of material. The nebula’s core, a blazing white dwarf with a temperature exceeding 100,000 K, continues to ionize the surrounding gas, causing it to glow for thousands of years before fading into the depths of interstellar space.

Captured in exquisite detail, this image showcases the haunting beauty of M97, a celestial owl whose watchful gaze reminds us of the delicate yet powerful forces governing the life and death of stars.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

Rising from the Flames - Seagull and Thor's Helmet Widefield - IC2177 & IC468

Glowing with the energy of massive stars, this stunning widefield view captures two of the most striking nebulae in the winter sky: the Seagull Nebula (IC 2177) and Thor’s Helmet (NGC 2359 or IC 468), both sculpted by the fierce stellar winds and radiation of young, hot stars.

The Seagull Nebula, a vast emission nebula spanning nearly 100 light-years, spreads its cosmic wings across the border of the constellations Monoceros and Canis Major. Formed from clouds of hydrogen ionized by powerful O-type stars embedded within, its glowing red and gold hues in this narrowband image highlight the presence of ionized sulfur (SII), hydrogen (Hα), and oxygen (OIII). The central bright region, known as Sh2-292, houses an intense star-forming region where young, energetic stars emerge from dense molecular clouds.

To the right of the frame, Thor’s Helmet (NGC 2359) stands as a testament to stellar fury. This bubble-like structure, spanning about 30 light-years, is shaped by the fierce stellar wind of a rare, massive Wolf-Rayet star (WR 7). These stars, nearing the end of their lives, shed their outer layers at immense speeds, creating shock waves that sculpt the surrounding gas into this intricate, helmet-like structure. The glowing filaments of ionized oxygen (OIII) give the nebula its distinct blue-green hue, contrasting beautifully with the fiery tones of the Seagull Nebula.

This narrowband image, rich in intricate filaments and glowing clouds, reveals the ongoing battle between star formation and stellar destruction—a cosmic phoenix rising from the ashes of past generations, continuing the endless cycle of birth, death, and renewal in our galaxy.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

NGC 1788 and the Cosmic Bat

Gliding through the Orion constellation on silent wings, NGC 1788, also known as the Cosmic Bat Nebula, is a dark and mysterious reflection nebula illuminated by the hidden glow of young stars embedded within its dense, dusty shroud. Situated about 1,300 light-years away, this nebula lies in a relatively isolated pocket of space, disconnected from Orion’s more famous star-forming regions yet still shaped by their powerful forces.

The nebula’s striking appearance comes from interstellar dust scattering the light of nearby young, massive stars. The Cosmic Bat spreads its ethereal wings across nearly 10 light-years, with dark filaments and intricate tendrils of gas silhouetted against a glowing blue reflection nebula. Hidden within are clusters of newly formed stars, whose energetic radiation carves and sculpts the surrounding dust, gradually dispersing it into space.

NGC 1788 is a prime example of a reflection nebula, where dust grains act like cosmic mirrors, redirecting starlight into the visible spectrum. Though it does not emit light on its own, the nebula glows with a haunting luminescence, revealing the complex interplay of light, dust, and star formation.

Captured in exquisite detail, this image of the Cosmic Bat unveils the delicate structures and subtle colors of one of Orion’s most enigmatic nebulae—an isolated yet stunning example of the quiet, ongoing birth of stars in the depths of space.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

Montes Alpes Region

Carved by ancient impacts and shaped by the relentless forces of lunar geology, the Montes Alpes (Alpine Mountains) stretch across the Moon’s northern hemisphere, forming a dramatic boundary between the vast Mare Imbrium and the rugged highlands. Spanning approximately 280 kilometers, this mountain range was formed over 3.8 billion years ago during the Imbrium Basin impact event, which reshaped much of the lunar surface.

One of the most striking features within this region is the Vallis Alpes (Alpine Valley), a remarkable rift cutting through the mountain range. This valley, stretching 166 kilometers long and up to 10 kilometers wide, is believed to have formed from tectonic forces and subsequent volcanic activity. A narrow, sinuous rille runs along its floor, hinting at past lava flow activity that once shaped the valley’s surface.

The surrounding Montes Alpes terrain is dotted with impact craters, some of which predate the Imbrium impact, offering a glimpse into the Moon’s complex geological history. Sunlight casts long shadows across the rugged peaks and deep valleys, emphasizing the dramatic topography of this ancient lunar landscape.

Captured with exquisite detail, this image reveals the stark beauty and dynamic history of the Montes Alpes region, a testament to the violent yet mesmerizing forces that have sculpted the Moon over billions of years.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

Jellyfish Nebula IC 443

Drifting through the constellation Gemini, IC 443, also known as the Jellyfish Nebula, is a supernova remnant stretching across 70 light-years. This ghostly structure is the aftermath of a massive star that exploded approximately 30,000 years ago, leaving behind an intricate web of glowing filaments and turbulent gas clouds.

Resembling a jellyfish floating through the cosmic deep, the nebula’s twisted tendrils of ionized hydrogen (Hα) and oxygen (OIII) trace the shock waves from the explosion as they interact with the surrounding interstellar medium. The nebula’s complex, rippled appearance is a result of these shock fronts colliding with dense molecular clouds, lighting up the gas as they compress and energize it.

At the heart of IC 443 lies a compact neutron star, the remnant core of the exploded progenitor star. This dense stellar remnant, sometimes called a pulsar, is a lighthouse of high-energy radiation, hinting at the violent origins of the nebula. IC 443 is also a powerful emitter in X-rays and radio wavelengths, making it one of the most well-studied supernova remnants in the sky.

Captured in rich detail, this image showcases the striking contrast between the nebula’s delicate filaments and the dark void of space beyond—a haunting reminder of the immense forces that shape the cosmos and the cycle of stellar death and rebirth.

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March 2025, 2025 Charles Lillo March 2025, 2025 Charles Lillo

Witch head nebula and Rigel

Carved by the intense radiation of the brilliant star Rigel, the Witch Head Nebula (IC 2118) drifts like a spectral apparition across the constellation Orion. This hauntingly beautiful reflection nebula, stretching nearly 70 light-years, is composed of interstellar dust and gas that scatters the brilliant blue light of Rigel, one of the most luminous stars in the Milky Way.

The nebula’s eerie shape, resembling the profile of a cackling witch, is sculpted by powerful stellar winds and radiation pressure from Rigel, located just outside the frame. The characteristic blue hue of IC 2118 arises as the fine dust particles preferentially scatter shorter-wavelength blue light—similar to the process that gives Earth's sky its color.

Beyond its ghostly appearance, the Witch Head Nebula is an active region where cold molecular clouds may be slowly condensing into new stars. Though tenuous and faint, it glows in infrared observations, revealing hidden structures and complex interactions within the interstellar medium.

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2025, March 2025 Charles Lillo 2025, March 2025 Charles Lillo

OU4 the giant squid nebula

Emerging from the depths of interstellar space, Ou4, known as the Giant Squid Nebula, is a rare and enigmatic structure drifting through the constellation Cepheus. This immense bipolar nebula spans nearly 50 light-years, with its ghostly tendrils of ionized oxygen stretching across the cosmos like the outstretched arms of a deep-sea leviathan.

Unlike typical emission nebulae, Ou4's origin remains a subject of scientific investigation. Initially believed to be a planetary nebula, it is now thought to be a massive outflow of gas ejected by the bright, central triple-star system HR 8119, which bathes the nebula in high-energy radiation, causing it to glow in a striking blue hue. Its faint, wispy structure is best revealed through deep imaging in the oxygen-III (OIII) wavelength, making this HOO capture an ideal palette for showcasing its elusive form.

Surrounding the Giant Squid is the broader Sh2-129, the Flying Bat Nebula, a hydrogen-rich emission nebula that provides a contrasting red backdrop, further emphasizing Ou4’s ethereal glow. The juxtaposition of these two nebulae hints at a complex interplay of stellar winds, radiation, and shock waves sculpting the interstellar medium.

Captured from Saint-Saturnin, France, this deep exposure reveals the extraordinary detail and delicate structures of one of the most intriguing and mysterious objects in the night sky—a spectral giant adrift in the cosmic ocean.

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