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Type TDE-featureless Supernova

The Story of Supernova TDE2026chm

An extraordinary stellar explosion that occurred 3.04 Billion Light-Years away in deep space.

⏱️ ~8 min deep read 🔬 24 Astrophysical Q&As 🔭 Viewing Guide Included 🪐 Constellation Leo
🔭 Deep Field (~2.1′ FOV) · DSS2 Optical (China-VO mirror)
● TDE2026chm Explosion Site

High-magnification deep optical view into TDE2026chm's host environment. Pan and scroll to explore the cosmic neighborhood where this star exploded.

⚡ Quick Observer Facts & Telemetry

IAU Transients DB
🌐 Distance to Earth
3.04 Billion Light-Years
Lookback Cosmic Time
✨ Peak Brightness
Mag 20.18 (g)
Large Observatory
☀️ Peak Radiance
6.3 billion Suns
Combined Stellar Energy
🚀 Shock Velocity
Not measured
No spectral ejecta velocity
🌌 Host Galaxy
Field Transient Host
Center Coincident
🧭 Constellation
Leo
The Lion
💥 Explosion Physics
Type TDE-featureless
Core-Collapse Supergiant
📅 Discovered On
2026/01/25
Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF
CHAPTER I

A Core-Collapse Class Transient

On 2026/01/25, astronomers scanning the heavens flagged a sudden, violent pinpoint of light that had flared into visibility. Designated TDE2026chm, it represents a catastrophic stellar explosion classified as a Type TDE-featureless supernova.

TDE2026chm 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 TDE2026chm.

Astrophysical Mechanism Summary
Type: Type TDE-featureless • Progenitor: Massive Red/Stripped Supergiant Star • Velocity: Not measured
CHAPTER II

A Message Across Deep Cosmic Time

TDE2026chm has a luminosity distance of approximately 3.04 Billion Light-Years (redshift z = 0.191). That figure is not the light-travel time: under flat ΛCDM the lookback time is ≈2336 Myr, when the light set out 2336.5 million years ago in deep Precambrian time, well before multicellular animals dominated Earth.

Luminosity distance incorporates cosmic expansion and exceeds the light-travel distance. The two quantities must be reported separately.

CHAPTER III

Incandescence of 6.3 billion Suns

An observed magnitude of 20.18 (g) is on record around 2026/01/25 (MJD 61065.4), with absolute magnitude -19.66 mag. A single detection is not evidence of a peak.

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.

CHAPTER IV

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 TDE-featureless light curves; an object-specific nickel mass for TDE2026chm 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.

CHAPTER V

Cosmic Kiln: Seeding the Elements of Life

Supernovae enrich galaxies with heavy elements. Events of TDE2026chm'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 TDE2026chm.

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.

CHAPTER VI

Galactic Setting in Leo

No host galaxy is identified for TDE2026chm in this catalog record . In our terrestrial sky, it resides in the constellation Leo (The Lion) at Right Ascension 11:05:19.153 and Declination +08:07:38.49.

CHAPTER VII

The Scientific Surveillance Campaign

Following its discovery by Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF, observatories worldwide swung their lenses toward TDE2026chm. In the Open Supernova Catalog, TDE2026chm is documented across 1 photometric measurements in passbands such as g and 0 spectroscopic epochs. These multi-wavelength observations allow astrophysicists to model the expanding photosphere, measure shock velocities, and probe circumstellar interactions.

CHAPTER VIII

Stargazer's Field Guide: Can You See It Tonight?

Can I see it tonight? Unknown — single-epoch observation only.

Discovered 284 days ago (2026/01/25). Observed magnitude m = 20.18 on 2026/01/25 (MJD 61065.4). A single photometry point is not evidence of a peak, rise, or decline.

Current brightness: No reliable current brightness estimate.

Instrument Class & ApertureSensitivity LimitObserved Single-Epoch Detection (m=20.18 on 2026/01/25 (MJD 61065.4))Current Brightness Tonight
Naked Eye
Dark sky site (Bortle 1–3) with no optical aid
m ≤ 6.0Requires larger aperture (limit m ≤ 6.0)No reliable estimate
Binoculars (50mm)
Standard 7x50 or 10x50 handheld binoculars
m ≤ 9.5Requires larger aperture (limit m ≤ 9.5)No reliable estimate
Small Backyard Scope (4" / 100mm)
Entry 4-inch (100mm) refractor / reflector
m ≤ 12.0Requires larger aperture (limit m ≤ 12.0)No reliable estimate
Medium Amateur Scope (8"–12")
8-inch to 12-inch Dobsonian or Schmidt-Cassegrain
m ≤ 14.5Requires larger aperture (limit m ≤ 14.5)No reliable estimate
Amateur CMOS Rig
Cooled monochrome/color CMOS camera with multi-hour stack
m ≤ 19.5Requires larger aperture (limit m ≤ 19.5)No reliable estimate
2m–3m Research Telescope
University or regional observatory (e.g. Palomar 60", Calar Alto)
m ≤ 22.0✅ ReachableNo reliable estimate
Giant 8m–10m Observatories
Keck (10m), VLT (8.2m), Gemini, Subaru optical imaging
m ≤ 25.0✅ ReachableNo reliable estimate
Space Observatories Only
Hubble Space Telescope (WFC3) / JWST (NIRCam deep stack)
m ≤ 30.0✅ ReachableNo reliable estimate

Planetary Safety Note: Even though TDE2026chm was a titanic explosion, our planet sits safely outside the lethal 50–100 light-year kill zone. At a distance of 3.04 Billion Light-Years, the blast poses zero physical hazard to Earth's biosphere.

🌌 Cosmic Neighbors & Contemporaries 105,768+ transients indexed

Cataloged transients closest to TDE2026chm in discovery time, spatial sky neighborhood, and cosmological redshift:

⏱️ Closest in Time
SN2026bgz Exploded same day
Type Ia 2026/01/25
SN2026bhe Exploded same day
Type Ia 2026/01/25
SN2026bhd Exploded same day
Type Ia 2026/01/25
🔭 Closest on the Sky
AT2019vib 13.3′ away
Type Candidate Discovered 2019/11/12
PS15tg 21.8′ away
Type Transient Discovered 2015/03/24
AT2021nln 21.9′ away
Type Candidate Discovered 2021/04/15
🌌 Same Cosmic Era (Redshift)
SDSS-II SN 3543 z = 0.191
Type Ia ~2635.8 Mly (approx.)
SN2006gp z = 0.191
Type Ia ~2635.8 Mly (approx.)
SN2007ow z = 0.191
Type Ia ~2635.8 Mly (approx.)

❓ Frequently Asked Questions About TDE2026chm

Scientific & observational Q&As indexed from astronomical databases & the Open Supernova Catalog
🔍 24 of 24
What type of supernova is TDE2026chm and what kind of star exploded? Astrophysics & Progenitor
TDE2026chm is classified as a tidal disruption event (TDE): a star was torn apart by a supermassive black hole's tidal field. This is not a stellar core-collapse or thermonuclear supernova; radioactive ⁵⁶Ni-powered light-curve models for supernovae do not apply by default.
What was the progenitor star doing in the millions of years leading up to TDE2026chm? Astrophysics & Progenitor
The specific progenitor of TDE2026chm has not been observed. Events of this spectroscopic class are generally associated with massive-star core collapse after successive nuclear burning stages (hydrogen → helium → carbon → neon → oxygen → silicon → iron). Typical lifetimes of such progenitors are tens of millions of years, but that is a class expectation—not a measured age or evolutionary track for this star. No pre-explosion imaging identification is cited in the available record for TDE2026chm.
How far away is TDE2026chm from Earth and how old is the light reaching us? Cosmic Distance & Time
TDE2026chm has a luminosity distance of approximately 3.04 Billion Light-Years (redshift z = 0.191, d_L = 931.03). Under a flat ΛCDM cosmology (H₀≈70 km/s/Mpc, Ωₘ≈0.3), the corresponding lookback time is ≈2336 Myr — when the light set out 2336.5 million years ago in deep Precambrian time, well before multicellular animals dominated Earth. Luminosity distance is larger than the light-travel distance because cosmic expansion stretches the path; the two must not be equated.
What does the cosmological redshift of TDE2026chm tell us about the expansion of space? Cosmic Distance & Time
TDE2026chm exhibits a measured spectroscopic redshift of z = 0.1910. The cockpit reports a user-facing recession velocity of 51,874.5 km/s, computed as the redshift Doppler-equivalent v = c·((1+z)²−1)/((1+z)²+1). Cosmological redshift is not generally equivalent to special-relativistic motion through space; this number is a convenient velocity label for z, not a measured peculiar velocity and not supernova ejecta speed. Bare c·z (≈57,260 km/s) is a different low-z approximation and is not mixed here.
How bright did TDE2026chm become at its peak, and how many Suns does that equal? Explosion Energetics
Observed (single-epoch) magnitude of TDE2026chm is 20.18 (g) on 2026/01/25 (MJD 61065.4). A single calibrated detection is not evidence of a peak; no rise, decline, or light curve can be established from one point. An absolute magnitude of -19.66 mag can be quoted only if distance is independently known.
How much total energy was released by TDE2026chm, and where did that energy go? Explosion Energetics
No object-specific energy budget is published for TDE2026chm. Tidal disruption events are powered by accretion onto a supermassive black hole, not by the neutrino burst or ⁵⁶Ni decay that dominate supernova energy discussions. Class-scale estimates must not be quoted as measurements of this event.
How fast are the supernova ejecta and shockwave of TDE2026chm expanding through space? Explosion Energetics
No ejecta velocity is measured for TDE2026chm. Blast-wave speed is obtained from Doppler shifts of spectral absorption features (e.g. Si II λ6355 for Type Ia), not from cosmological redshift. Any recession velocity derived from z describes Hubble flow, not the explosion debris.
What powers the prolonged glow of TDE2026chm weeks and months after detonation? Radioactive Engine
Radioactive ⁵⁶Ni decay is not the default power source for TDE2026chm. As a tidal disruption event, the optical light curve is generally discussed in terms of accretion and circularization physics, not the supernova ⁵⁶Ni → ⁵⁶Co → ⁵⁶Fe chain. No object-specific nickel mass applies.
What chemical elements did TDE2026chm create and disperse into the universe? Nucleosynthesis & Elements
TDE2026chm is a TDE, not a nucleosynthesis factory in the supernova sense. Observed abundances reflect debris from the disrupted star and accretion-flow physics; no supernova-style elemental yield is published for this object.
Did TDE2026chm leave behind a black hole, a neutron star, or nothing at all? Cosmic Remnant
A core-collapse explosion associated with TDE2026chm's class forges an ultra-dense compact stellar remnant at the center of the detonation. If the progenitor had an initial mass under ~20 solar masses, it left behind a neutron star (pulsar)—packing the mass of our entire Sun into a city-sized sphere barely 20 kilometers wide, spinning dozens or hundreds of times per second. If the progenitor exceeded ~25–30 solar masses, gravity overcame neutron degeneracy pressure, creating a permanent stellar-mass black hole.
What will TDE2026chm's explosion site look like in 1,000 to 10,000 years? Cosmic Remnant
Supernova remnants in general evolve through free-expansion, Sedov–Taylor, and radiative phases over centuries to millennia, sometimes becoming bright X-ray shells and occasionally compressing nearby molecular clouds. These are standard remnant-evolution models, not forecasts measured for TDE2026chm. Whether this site will trigger star formation, reach particular X-ray temperatures, or match Cassiopeia A depends on local density and magnetic field—none of which are constrained by the data shown here.
In which galaxy did TDE2026chm explode, and where is it located relative to the galactic center? Galactic Environment
No host galaxy is identified for TDE2026chm in this catalog record. A blank host field means the association is unresolved here—it does not establish that the host is uncataloged, resolved in imaging, or securely linked by astrometry. Possible states (unidentified, hostless candidate, imaging detection without a catalog name, or a securely matched cataloged galaxy) require separate evidence that is not present in this field.
Where is TDE2026chm located in the night sky and which constellation is it in? Sky Coordinates
In the celestial sphere, TDE2026chm is located at Right Ascension 11:05:19.153 and Declination +08:07:38.49, situated in the constellation Leo (The Lion). Because its declination is +08:07:38.49, it is primarily placed in the Northern celestial hemisphere.
How much Milky Way interstellar dust obscures our view of TDE2026chm? Interstellar Dust
Along this line of sight, the catalog records a Milky Way foreground color excess of E(B−V) = 0.0392 mag (source: Analytical Galactic Disk Model (IAU)), corresponding to roughly A_V ≈ 0.12 mag for R_V = 3.1. Band-specific corrections (e.g. A_r) differ from A_V and should be applied when available. Map-based values (IRSA / Schlafly & Finkbeiner 2011) must not be claimed unless that map was actually queried.
Across which photometric filter bands was TDE2026chm monitored? Astronomical Observations
TDE2026chm has 1 calibrated photometric detection on record in g from ZTF. A single point is not a light curve: no rise, peak, or decline rate can be measured until additional epochs are published.
What did astronomical spectroscopy reveal about TDE2026chm's chemical makeup? Astronomical Observations
No spectrum has been published for TDE2026chm. Without spectroscopy, its chemical composition, expansion velocity, and physical classification cannot be established. Classification spectra from follow-up observatories would be required to identify diagnostic absorption and emission lines.
Who discovered TDE2026chm and how was it first detected? Discovery & History
TDE2026chm was officially reported on 2026/01/25 by Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF. Discoveries are typically flagged by high-cadence robotic survey telescopes (such as ATLAS, ZTF, Pan-STARRS, ASAS-SN, or Gaia) and worldwide amateur astronomers scanning the night sky, followed by rapid spectroscopic classification by international observatories.
How many scientific publications and observatories have contributed data to TDE2026chm? Scientific Research
TDE2026chm is documented across 3 scientific references and archival data sources in the Open Supernova Catalog. These include discovery circulars and research datasets from Transient Name Server, 2026TNSTR.526....1S, The Open Supernova Catalog. All raw photometry and spectroscopy points are cross-indexed to their original bibliographic records for peer-reviewed verification.
What other names and survey identifiers exist for TDE2026chm? Cross-Identifications
Throughout global alert streams and survey databases, TDE2026chm has also been designated as: 2026chm, GOTO26arx, ATLAS26boh, ZTF26aadsfxv. 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).
How does TDE2026chm contribute to measuring the Hubble Constant and the scale of the cosmos? Cosmology & Distance Ladder
TDE2026chm cannot currently be used for cosmological distance work because its classification is unresolved. The distance ladder relies on type-specific techniques: Type Ia supernovae use the Phillips relation between peak absolute magnitude and decline rate, while Type II events use the Expanding Photosphere Method or SCM-II. An unclassified transient fits neither, so no Hubble-constant constraint can be derived from it until a spectrum establishes its type.
Could gravitational waves or neutrinos from TDE2026chm be detected on Earth? Multi-Messenger Astronomy
No neutrino or gravitational-wave counterpart has been reported for TDE2026chm, and none is expected to be identifiable without a classification. The multi-messenger signature differs sharply by type: core-collapse events emit a neutrino burst at shock breakout (detected once, for SN 1987A), while thermonuclear Type Ia events produce negligible neutrinos and gravitational waves. Searching for a counterpart before knowing which mechanism applies would be unfocused.
How does TDE2026chm compare to famous historical supernovae like SN 1987A or the Crab Supernova? Historical Comparison
Compared to historical landmarks like SN 1987A in the Large Magellanic Cloud (168,000 light-years away, naked-eye peak m = 2.9) or the Crab Supernova of 1054 (6,500 light-years away), TDE2026chm occurred at a distance of 3.04 Billion Light-Years. While historical naked-eye supernovae occurred within our Milky Way or its immediate satellites, modern discoveries like TDE2026chm allow astrophysicists to probe diverse galactic environments, metallicities, and stellar populations across the broader universe.
Can I see TDE2026chm tonight with a backyard telescope or binoculars? Backyard Observation
Unknown — no measured brightness. TDE2026chm was discovered 284 days ago (2026/01/25), but no calibrated photometry is published for it, so its current apparent magnitude cannot be stated. Without a magnitude there is no basis for a telescope-aperture recommendation. Use the coordinates and airmass chart above to plan a follow-up observation and report what you measure.
Does the radiation or shockwave from TDE2026chm pose any threat to Earth? Planetary Safety
No, Earth is in zero danger. Supernovae are violent events emitting powerful gamma rays, X-rays, and cosmic rays; however, the astrophysical 'lethal kill zone' for our planet's protective ozone layer is estimated at 50 to 100 light-years. At a distance of 3.04 Billion Light-Years, the inverse-square law dilutes the radiation by quintillions of times, making TDE2026chm completely harmless to our biosphere and purely a fascinating spectacle for human exploration.
Data sourced from IAU TNS, ALeRCE, WISeREP, and the Open Supernova Catalog. View All General Astrophysics FAQs →
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