High-magnification deep optical view into N157B's host environment. Pan and scroll to explore the cosmic neighborhood where this star exploded.
⚡ Quick Observer Facts & Telemetry
IAU Transients DBA Core-Collapse Class Transient
On —, astronomers scanning the heavens flagged a sudden, violent pinpoint of light that had flared into visibility. Designated N157B, it represents a catastrophic stellar explosion classified as a Type CC supernova.
N157B is classified in a core-collapse spectroscopic family. Events of this class are generally linked to the death of a massive star after successive nuclear burning stages, but no unique progenitor mass, lifetime, or pre-explosion identification is established for this object. The narrative of onion-shell fusion ending in iron-core collapse describes the class model, not a measured biography of N157B.
A Message Across Deep Cosmic Time
N157B has a luminosity distance of approximately 163,110 Light-Years
(redshift z = 1.13e-05).
Lookback time is unavailable without a usable redshift; do not equate luminosity distance with travel time.
Luminosity distance incorporates cosmic expansion and exceeds the light-travel distance. The two quantities must be reported separately.
Brightness Record
No calibrated peak magnitude is published for N157B, so neither its apparent brightness nor an equivalent solar luminosity can be stated.
The total energy released by the cataclysm was on the order of 10⁵¹ to 10⁵³ ergs. Over 99% of this energy was emitted within the first 10 seconds as a dense burst of trillions of neutrinos, with only 1% driving the visible blast wave.
The Radioactive Furnace: Why Supernovae Glow for Months
After peak, many supernovae are powered by the radioactive chain ⁵⁶Ni → ⁵⁶Co → ⁵⁶Fe. That is the standard model for Type CC light curves; an object-specific nickel mass for N157B is not published here.
Nickel-56 decays to Cobalt-56 (half-life ≈6.1 days), then to stable Iron-56 (half-life ≈77.2 days), heating the ejecta from within. Typical class yields must not be quoted as measured values for this event.
Cosmic Kiln: Seeding the Elements of Life
Supernovae enrich galaxies with heavy elements. Events of N157B's class are associated with oxygen-group and intermediate-mass products (O, C, Ne, Mg, Si) in galactic chemical-evolution models. No measured elemental yields are published for N157B.
As Carl Sagan observed, "We are made of star-stuff" — a statement about nucleosynthesis in general, not a claim that atoms from this specific remnant are identified in the Solar System.
Galactic Setting in Mensa
N157B is associated with cataloged host LMC
.
In our terrestrial sky, it resides in the constellation Mensa (The Table Mountain) at Right Ascension 05:37:46
and Declination -69:10:28.
The Scientific Surveillance Campaign
Following its discovery by an automated sky survey, observatories worldwide swung their lenses toward N157B. In the Open Supernova Catalog, N157B is documented across 0 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? Unknown — no measured brightness.
Discovered unknown epoch (unknown discovery date). No reliable current brightness estimate — no photometry has been published.
Planetary Safety Note: Even though N157B was a titanic explosion, our planet sits safely outside the lethal 50–100 light-year kill zone. At a distance of 163,110 Light-Years, the blast poses zero physical hazard to Earth's biosphere.
Cataloged transients closest to N157B in discovery time, spatial sky neighborhood, and cosmological redshift:
❓ Frequently Asked Questions About N157B
What type of supernova is N157B and what kind of star exploded? Astrophysics & Progenitor
What was the progenitor star doing in the millions of years leading up to N157B? Astrophysics & Progenitor
How far away is N157B from Earth and how old is the light reaching us? Cosmic Distance & Time
What does the cosmological redshift of N157B tell us about the expansion of space? Cosmic Distance & Time
How bright did N157B become at its peak, and how many Suns does that equal? Explosion Energetics
How much total energy was released by N157B, and where did that energy go? Explosion Energetics
How fast are the supernova ejecta and shockwave of N157B expanding through space? Explosion Energetics
What powers the prolonged glow of N157B weeks and months after detonation? Radioactive Engine
What chemical elements did N157B create and disperse into the universe? Nucleosynthesis & Elements
Did N157B leave behind a black hole, a neutron star, or nothing at all? Cosmic Remnant
What will N157B's explosion site look like in 1,000 to 10,000 years? Cosmic Remnant
In which galaxy did N157B explode, and where is it located relative to the galactic center? Galactic Environment
Where is N157B located in the night sky and which constellation is it in? Sky Coordinates
How much Milky Way interstellar dust obscures our view of N157B? Interstellar Dust
Across which photometric filter bands was N157B monitored? Astronomical Observations
What did astronomical spectroscopy reveal about N157B's chemical makeup? Astronomical Observations
Who discovered N157B and how was it first detected? Discovery & History
How many scientific publications and observatories have contributed data to N157B? Scientific Research
What other names and survey identifiers exist for N157B? Cross-Identifications
LMCSNR J053746-691028, MCSNR J0537-6910. 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).