High-magnification deep optical view into SN2011hh's host environment. Pan and scroll to explore the cosmic neighborhood where this star exploded.
⚡ Quick Observer Facts & Telemetry
IAU Transients DBThe Thermonuclear Obliteration of a White Dwarf
On 2011/10/26, astronomers scanning the heavens flagged a sudden, violent pinpoint of light that had flared into visibility. Designated SN2011hh, it represents a catastrophic stellar explosion classified as a Type Ia supernova.
In a binary star system located deep within A025704+4947, a dense carbon-oxygen white dwarf—the dead stellar corpse of an ancient sun—orbited its stellar companion for millions of years. As it siphoned material across the gravitational saddle point, its mass relentlessly climbed toward the Chandrasekhar limit of 1.4 solar masses. At that fateful tipping point, uncontrollable carbon fusion ignited in the degenerate core, ripping the entire star apart in a thermonuclear detonation that left behind zero remnant.
A Message Across Deep Cosmic Time
The light from SN2011hh is a dispatch from an ancient past. Located approximately 218.9 Million Light-Years away
(redshift z = 0.015), the photons detected by telescopes today began their journey
218.9 million years ago during the Triassic period as the earliest dinosaurs and mammals were just evolving.
While this burst of electromagnetic radiation traversed the cold void of intergalactic space at 299,792 kilometers per second, continents on Earth drifted, mountain ranges rose, and entire ecosystems rose and fell. To look into a telescope at SN2011hh is to gaze directly into prehistoric cosmic time.
Incandescence of 648.6 million Suns
At the height of the outburst around 2011/10/28, SN2011hh surged to a peak apparent magnitude of 16.9 and an intrinsic absolute magnitude of -17.2. At that instant, this single dying star radiated with the collective power of approximately 648.6 million Suns combined, outshining whole dwarf galaxies and illuminating the surrounding interstellar medium.
The total energy released by the cataclysm was on the order of 10⁵¹ to 10⁵³ ergs. Virtually all of this was deposited into the kinetic shockwave and radioactive nucleosynthesis.
The Radioactive Furnace: Why Supernovae Glow for Months
Unlike a conventional terrestrial explosion that cools and goes dark in seconds, SN2011hh shone brightly for weeks and months. The secret behind this prolonged celestial glow is nuclear physics: the extreme heat and pressure of detonation synthesized vast quantities of radioactive Nickel-56 (⁵⁶Ni).
With a half-life of 6.075 days, Nickel-56 decays into Cobalt-56 (⁵⁶Co), emitting gamma rays and high-energy positrons that heat the expanding ejecta from within. Cobalt-56 in turn decays with a half-life of 77.2 days into stable Iron-56 (⁵⁶Fe), powering the steady exponential radioactive tail observed in the light curve.
Cosmic Kiln: Seeding the Elements of Life
Supernovae are the premier chemical foundries of our universe. SN2011hh forged and liberated tons of newly synthesized elements: rich supplies of iron, silicon, calcium, and sulfur that will one day seed the formation of rocky terrestrial worlds.
As Carl Sagan famously observed, "We are made of star-stuff." The iron atoms that carry oxygen in human hemoglobin and the calcium in our bones were originally forged in explosions identical to SN2011hh billions of years ago.
Galactic Setting in Perseus
SN2011hh detonated inside A025704+4947, positioned at an offset of 5.91″ (1.86 kpc) from the galactic nucleus.
In our terrestrial sky, it resides in the constellation Perseus (The Hero) at Right Ascension 02:57:04.61
and Declination +49:47:43.3.
The Scientific Surveillance Campaign
Following its discovery by Lipunov, observatories worldwide swung their lenses toward SN2011hh. In the Open Supernova Catalog, SN2011hh is documented across 1 photometric measurements and 0 spectroscopic epochs. These multi-wavelength observations allow astrophysicists to model the expanding photosphere, measure shock velocities, and probe circumstellar interactions.
Stargazer's Field Guide: Can You See It Tonight?
Can I see it tonight? No — this supernova is physically extinguished.
Supernovae are brief, explosive cosmic catastrophes. They brighten over days to weeks and then permanently fade into darkness as their radioactive nickel-56 and cobalt-56 fuel decays. This explosion occurred 14.9 years ago (2011/10/28). Accounting for cosmological time dilation at redshift z = 0.0150, the rest-frame age is +5371.4 days. By standard radioactive decay templates, its optical brightness has decayed by Δm ≈ 82.0 magnitudes to an estimated magnitude 98.9, rendering the transient undetectable to all ground-based observatories.
Instrument Breakdown: At its maximum brightness in 2011/10/28, it reached magnitude 16.90 (Amateur CMOS Rig). Tonight, pointing a telescope at these coordinates will reveal only the background host galaxy (A025704+4947).
| Instrument Class & Aperture | Sensitivity Limit | At Peak Maximum (m=16.90) | Tonight (Est. m≈98.9) |
|---|---|---|---|
| Naked Eye Dark sky site (Bortle 1–3) with no optical aid |
m ≤ 6.0 | ❌ Below limit | ❌ Below limit |
| Binoculars (50mm) Standard 7x50 or 10x50 handheld binoculars |
m ≤ 9.5 | ❌ Below limit | ❌ Below limit |
| Small Backyard Scope (4" / 100mm) Entry 4-inch (100mm) refractor / reflector |
m ≤ 12.0 | ❌ Below limit | ❌ Below limit |
| Medium Amateur Scope (8"–12") 8-inch to 12-inch Dobsonian or Schmidt-Cassegrain |
m ≤ 14.5 | ❌ Below limit | ❌ Below limit |
| Amateur CMOS Rig Cooled monochrome/color CMOS camera with multi-hour stack |
m ≤ 19.5 | ✅ Detectable | ❌ Below limit |
| 2m–3m Research Telescope University or regional observatory (e.g. Palomar 60", Calar Alto) |
m ≤ 22.0 | ✅ Detectable | ❌ Below limit |
| Giant 8m–10m Observatories Keck (10m), VLT (8.2m), Gemini, Subaru optical imaging |
m ≤ 25.0 | ✅ Detectable | ❌ Below limit |
| Space Observatories Only Hubble Space Telescope (WFC3) / JWST (NIRCam deep stack) |
m ≤ 30.0 | ✅ Detectable | ❌ Below limit |
Planetary Safety Note: Even though SN2011hh was a titanic explosion, our planet sits safely outside the lethal 50–100 light-year kill zone. At a distance of 218.9 Million Light-Years, the blast poses zero physical hazard to Earth's biosphere.
Cataloged supernovae closest to SN2011hh in discovery time, spatial sky neighborhood, and cosmological lookback epoch:
❓ Frequently Asked Questions About SN2011hh
What type of supernova is SN2011hh and what kind of star exploded? Astrophysics & Progenitor
What was the progenitor star doing in the millions of years leading up to SN2011hh? Astrophysics & Progenitor
How far away is SN2011hh from Earth and how old is the light reaching us? Cosmic Distance & Time
What does the cosmological redshift of SN2011hh tell us about the expansion of space? Cosmic Distance & Time
How bright did SN2011hh become at its peak, and how many Suns does that equal? Explosion Energetics
How much total energy was released by SN2011hh, and where did that energy go? Explosion Energetics
How fast are the supernova ejecta and shockwave of SN2011hh expanding through space? Explosion Energetics
What powers the prolonged glow of SN2011hh weeks and months after detonation? Radioactive Engine
What chemical elements did SN2011hh create and disperse into the universe? Nucleosynthesis & Elements
Did SN2011hh leave behind a black hole, a neutron star, or nothing at all? Cosmic Remnant
What will SN2011hh's explosion site look like in 1,000 to 10,000 years? Cosmic Remnant
In which galaxy did SN2011hh explode, and where is it located relative to the galactic center? Galactic Environment
Where is SN2011hh located in the night sky and which constellation is it in? Sky Coordinates
How much Milky Way interstellar dust obscures our view of SN2011hh? Interstellar Dust
Across which photometric filter bands was SN2011hh monitored? Astronomical Observations
What did astronomical spectroscopy reveal about SN2011hh's chemical makeup? Astronomical Observations
Who discovered SN2011hh and how was it first detected? Discovery & History
How many scientific publications and observatories have contributed data to SN2011hh? Scientific Research
What other names and survey identifiers exist for SN2011hh? Cross-Identifications
MASTER OT 025704+494743. These cross-matched identifiers allow astronomers to cross-reference observations across the Zwicky Transient Facility (ZTF), the Asteroid Terrestrial-impact Last Alert System (ATLAS), Pan-STARRS, Gaia Photometric Science Alerts, and the IAU Transient Name Server (TNS).