ASASSN-14bb: What Happened, Distance & Viewing Guide

Q: What type of supernova is ASASSN-14bb and what kind of star exploded?

ASASSN-14bb is spectroscopically classified as a Type Ia supernova, consistent with a thermonuclear explosion involving a carbon-oxygen white dwarf. Type Ia events are used as distance indicators via empirical relations such as the Phillips relation, but that cosmological utility does not identify which binary channel (single-degenerate accretion, double-degenerate merger, or sub-Chandrasekhar detonation) produced this object.

Q: How far away is ASASSN-14bb from Earth and how old is the light reaching us?

ASASSN-14bb has a luminosity distance of approximately 322.9 Million Light-Years (redshift z = 0.022, d_L = 99). Under a flat ΛCDM cosmology (H₀≈70 km/s/Mpc, Ωₘ≈0.3), the corresponding lookback time is ≈302 Myr — when the light set out 302.5 million years ago during the Paleozoic era, long before the first dinosaurs appeared on Earth. Luminosity distance is larger than the light-travel distance because cosmic expansion stretches the path; the two must not be equated.

Q: What does the cosmological redshift of ASASSN-14bb tell us about the expansion of space?

ASASSN-14bb exhibits a measured spectroscopic redshift of z = 0.0220. The cockpit reports a user-facing recession velocity of 6,522.9 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 (≈6,595 km/s) is a different low-z approximation and is not mixed here.

Q: What chemical elements did ASASSN-14bb create and disperse into the universe?

Type Ia explosions are efficient producers of iron-peak elements via thermonuclear burning. Models typically yield substantial ⁵⁶Ni (which decays to stable ⁵⁶Fe), plus silicon, sulfur, calcium, and related species—consistent with the Si II features used in classification. No object-specific nucleosynthetic yield has been published for ASASSN-14bb; asserting that this event synthesized half a solar mass of iron would overstate the evidence.

Q: Did ASASSN-14bb leave behind a black hole, a neutron star, or nothing at all?

Nothing remains at the center. Because a Type Ia supernova involves the total thermonuclear disruption of the progenitor white dwarf, the entire star was incinerated and flung into space. There is no central neutron star, pulsar, or black hole left behind. The star's entire mass now exists as an expanding gaseous shell traveling through the host galaxy.

          🔭 Deep Field (~2.1′ FOV) · DSS2 Optical (China-VO mirror)
        

● ASASSN-14bb Explosion Site

High-magnification deep optical view into ASASSN-14bb'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

322.9 Million Light-Years

Lookback Cosmic Time

✨ Peak Brightness

Mag 14.95

Astro Camera (CCD)

☀️ Peak Radiance

8.6 billion Suns

Combined Stellar Energy

🚀 Shock Velocity

~6,500 km/s

~2.2% Speed of Light

🌌 Host Galaxy

2MASX J12141125+3839400

Offset: 0.84″ (0.39 kpc)

🧭 Constellation

Canes Venatici

The Hunting Dogs

💥 Explosion Physics

Type Ia

Thermonuclear White Dwarf

📅 Discovered On

2014/05/19

ASAS-SN

CHAPTER I

A Type Ia Thermonuclear Explosion

On 2014/05/19, astronomers scanning the heavens flagged a sudden, violent pinpoint of light that had flared into visibility. Designated ASASSN-14bb, it represents a catastrophic stellar explosion classified as a Type Ia supernova.

ASASSN-14bb is spectroscopically classified as Type Ia, consistent with a thermonuclear white-dwarf explosion in 2MASX J12141125+3839400. Competing progenitor channels (single-degenerate accretion, double-degenerate merger, sub-Chandrasekhar detonations) remain open; an individual accretion history toward the Chandrasekhar mass is not established for this event.

Astrophysical Mechanism Summary

Type: Type Ia • Progenitor: Carbon-Oxygen White Dwarf (Binary System) • Velocity: ~6,500 km/s (~2.2% c)

CHAPTER II

A Message Across Deep Cosmic Time

ASASSN-14bb has a luminosity distance of approximately 322.9 Million Light-Years (redshift z = 0.022). That figure is not the light-travel time: under flat ΛCDM the lookback time is ≈302 Myr, when the light set out 302.5 million years ago during the Paleozoic era, long before the first dinosaurs appeared on Earth.

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

CHAPTER III

Incandescence of 8.6 billion Suns

At the height of the outburst around 2014/05/29, ASASSN-14bb surged to a peak apparent magnitude of 14.95 and an intrinsic absolute magnitude of -20. At that instant, this single dying star radiated with the collective power of approximately 8.6 billion Suns combined, outshining whole dwarf galaxies.

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.

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 Ia light curves; an object-specific nickel mass for ASASSN-14bb 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 ASASSN-14bb's class are associated with iron-peak and intermediate-mass products (Ni/Fe, Si, S, Ca) in galactic chemical-evolution models. No measured elemental yields are published for ASASSN-14bb.

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 Canes Venatici

ASASSN-14bb is associated with cataloged host 2MASX J12141125+3839400 , at an offset of 0.84″ (0.39 kpc) from the reported galactic center. In our terrestrial sky, it resides in the constellation Canes Venatici (The Hunting Dogs) at Right Ascension 12:14:11.30 and Declination +38:39:40.8.

CHAPTER VII

The Scientific Surveillance Campaign

Following its discovery by ASAS-SN, observatories worldwide swung their lenses toward ASASSN-14bb. In the sne.space, ASASSN-14bb 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.

CHAPTER VIII

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

Can I see it tonight? Unknown — no measured brightness.

Discovered 12.5 years ago (2014/05/19). No reliable current brightness estimate — no photometry has been published.

Planetary Safety Note: Even though ASASSN-14bb was a titanic explosion, our planet sits safely outside the lethal 50–100 light-year kill zone. At a distance of 322.9 Million Light-Years, the blast poses zero physical hazard to Earth's biosphere.

🌌 Cosmic Neighbors & Contemporaries 105,868+ transients indexed

Cataloged transients closest to ASASSN-14bb in discovery time, spatial sky neighborhood, and cosmological redshift:

⏱️ Closest in Time

ASASSN-14ay Exploded same day

Type Ia 2014/05/19 · Mag 16.2

SN2014bc Exploded same day

Type II P 2014/05/19 · Mag 14.72

ASASSN-14ba Exploded same day

Type Ia Pec 2014/05/19 · Mag 16.6

🔭 Closest on the Sky

AT2019ga 6.8′ away

Type Candidate Discovered 2019/01/03

SN2019kju 20.3′ away

Type Ia Discovered 2019/07/03

AT2021row 25.5′ away

Type Candidate Discovered 2021/06/19

🌌 Same Cosmic Era (Redshift)

SN1991Z z = 0.022

Type Transient ~301.4 Mly (approx.)

SN1997ej z = 0.022

Type Ia ~301.4 Mly (approx.)

SN1994ah z = 0.022

Type Ia ~301.4 Mly (approx.)

❓ Frequently Asked Questions About ASASSN-14bb

Scientific & observational Q&As indexed from astronomical databases & the sne.space

What type of supernova is ASASSN-14bb and what kind of star exploded? Astrophysics & Progenitor

ASASSN-14bb is spectroscopically classified as a Type Ia supernova, consistent with a thermonuclear explosion involving a carbon-oxygen white dwarf. Type Ia events are used as distance indicators via empirical relations such as the Phillips relation, but that cosmological utility does not identify which binary channel (single-degenerate accretion, double-degenerate merger, or sub-Chandrasekhar detonation) produced this object.

What was the progenitor star doing in the millions of years leading up to ASASSN-14bb? Astrophysics & Progenitor

No unique progenitor history is established for ASASSN-14bb. Type Ia spectral classification is consistent with a thermonuclear explosion of a carbon-oxygen white dwarf, but it does not identify which binary pathway produced this event. Leading models include single-degenerate accretion toward the Chandrasekhar mass, double-degenerate white-dwarf mergers, and sub-Chandrasekhar helium-shell detonations. Distinguishing these requires population statistics, early-time spectra, or remnant searches that are not established for this individual object. Claims that this white dwarf accreted for millions of years, or that it approached 1.4 solar masses, are general theory—not documented facts about ASASSN-14bb.

How far away is ASASSN-14bb from Earth and how old is the light reaching us? Cosmic Distance & Time

ASASSN-14bb has a luminosity distance of approximately 322.9 Million Light-Years (redshift z = 0.022, d_L = 99). Under a flat ΛCDM cosmology (H₀≈70 km/s/Mpc, Ωₘ≈0.3), the corresponding lookback time is ≈302 Myr — when the light set out 302.5 million years ago during the Paleozoic era, long before the first dinosaurs appeared on 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 ASASSN-14bb tell us about the expansion of space? Cosmic Distance & Time

ASASSN-14bb exhibits a measured spectroscopic redshift of z = 0.0220. The cockpit reports a user-facing recession velocity of 6,522.9 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 (≈6,595 km/s) is a different low-z approximation and is not mixed here.

How bright did ASASSN-14bb become at its peak, and how many Suns does that equal? Explosion Energetics

At peak brightness, ASASSN-14bb achieved an apparent magnitude of 14.95 around 2014/05/29. Corrected for cosmic distance and foreground interstellar dust, its intrinsic absolute magnitude was -20. At this peak, the exploding star radiated with the incandescent brilliance of approximately 8.6 billion Suns combined, briefly outshining the cumulative starlight of entire dwarf galaxies!

How much total energy was released by ASASSN-14bb, and where did that energy go? Explosion Energetics

Type Ia events are typically associated with a kinetic energy scale of order 10⁵¹ ergs, with little neutrino emission compared to core-collapse. That is a class expectation—not a calorimetry measurement for ASASSN-14bb.

How fast are the supernova ejecta and shockwave of ASASSN-14bb expanding through space? Explosion Energetics

Spectroscopic line blueshifts imply an ejecta velocity of approximately 6,500 km/s (~2.2% of c) for ASASSN-14bb. This is distinct from cosmological recession velocity inferred from redshift.

What powers the prolonged glow of ASASSN-14bb weeks and months after detonation? Radioactive Engine

After peak, Type Ia light curves are generally powered by the radioactive chain ⁵⁶Ni → ⁵⁶Co → ⁵⁶Fe (half-lives ≈6.1 d and ≈77.2 d). Typical Type Ia events synthesize of order half a solar mass of freshly made Nickel-56 (which later decays into Iron-56); that is a class expectation, not a measured nickel mass for ASASSN-14bb. Estimating M(⁵⁶Ni) for this object requires a bolometric light-curve fit that is not published here.

What chemical elements did ASASSN-14bb create and disperse into the universe? Nucleosynthesis & Elements

Type Ia explosions are efficient producers of iron-peak elements via thermonuclear burning. Models typically yield substantial ⁵⁶Ni (which decays to stable ⁵⁶Fe), plus silicon, sulfur, calcium, and related species—consistent with the Si II features used in classification. No object-specific nucleosynthetic yield has been published for ASASSN-14bb; asserting that this event synthesized half a solar mass of iron would overstate the evidence.

Did ASASSN-14bb leave behind a black hole, a neutron star, or nothing at all? Cosmic Remnant

Nothing remains at the center. Because a Type Ia supernova involves the total thermonuclear disruption of the progenitor white dwarf, the entire star was incinerated and flung into space. There is no central neutron star, pulsar, or black hole left behind. The star's entire mass now exists as an expanding gaseous shell traveling through the host galaxy.

What will ASASSN-14bb'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 ASASSN-14bb. 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 ASASSN-14bb explode, and where is it located relative to the galactic center? Galactic Environment

ASASSN-14bb is associated with cataloged host 2MASX J12141125+3839400 at an angular/physical offset of 0.84″ (0.39 kpc) from the reported galactic center. That offset places the transient in the host's projected light distribution; it does not by itself prove which stellar population produced the progenitor.

Where is ASASSN-14bb located in the night sky and which constellation is it in? Sky Coordinates

In the celestial sphere, ASASSN-14bb is located at Right Ascension 12:14:11.30 and Declination +38:39:40.8, situated in the constellation Canes Venatici (The Hunting Dogs). Because its declination is +38:39:40.8, it is primarily placed in the Northern celestial hemisphere.

How much Milky Way interstellar dust obscures our view of ASASSN-14bb? Interstellar Dust

Along this line of sight, the catalog records a Milky Way foreground color excess of E(B−V) = 0.0134 mag (source: published extinction estimate), corresponding to roughly A_V ≈ 0.04 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 ASASSN-14bb monitored? Astronomical Observations

No calibrated photometry is published for ASASSN-14bb. Without multi-epoch flux measurements, neither a light curve nor a peak magnitude can be established. Follow-up imaging from survey alert streams would be required to map its brightness evolution.

What did astronomical spectroscopy reveal about ASASSN-14bb's chemical makeup? Astronomical Observations

No spectrum has been published for ASASSN-14bb. 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 ASASSN-14bb and how was it first detected? Discovery & History

ASASSN-14bb was officially reported on 2014/05/19 by ASAS-SN. 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 ASASSN-14bb? Scientific Research

Data for ASASSN-14bb are compiled from international astronomical notices, the IAU Transient Name Server (TNS), and peer-reviewed astrophysical journals.

What other names and survey identifiers exist for ASASSN-14bb? Cross-Identifications

Throughout global alert streams and survey databases, ASASSN-14bb has also been designated as: iPTF14axo. 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 ASASSN-14bb contribute to measuring the Hubble Constant and the scale of the cosmos? Cosmology & Distance Ladder

Because ASASSN-14bb is a Type Ia supernova, it serves as an indispensable rung on the Cosmic Distance Ladder. Astrophysicists utilize the Phillips relation—a tight empirical correlation between peak absolute magnitude and light curve decline rate (Δm₁₅)—to standardize its luminosity. By comparing this calibrated intrinsic brightness with observed apparent magnitude, researchers calculate precise geometric distances across the universe, providing key empirical tests of the Hubble constant (H₀) and dark energy.

Could gravitational waves or neutrinos from ASASSN-14bb be detected on Earth? Multi-Messenger Astronomy

For thermonuclear explosions like ASASSN-14bb, gravitational wave and neutrino emissions are negligible compared to core-collapse events. However, multi-messenger radio and X-ray observations are crucial: detecting synchrotron radio emission would reveal circumstellar gas shed by a companion star, helping settle the century-old debate between single-degenerate and double-degenerate white dwarf progenitor channels.

How does ASASSN-14bb 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), ASASSN-14bb occurred at a distance of 322.9 Million Light-Years. While historical naked-eye supernovae occurred within our Milky Way or its immediate satellites, modern discoveries like ASASSN-14bb allow astrophysicists to probe diverse galactic environments, metallicities, and stellar populations across the broader universe.

Can I see ASASSN-14bb tonight with a backyard telescope or binoculars? Backyard Observation

Unknown — no measured brightness. ASASSN-14bb was discovered 4563 days ago (2014/05/19), 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 ASASSN-14bb 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 322.9 Million Light-Years, the inverse-square law dilutes the radiation by quintillions of times, making ASASSN-14bb completely harmless to our biosphere and purely a fascinating spectacle for human exploration.

Data sourced from IAU TNS, ALeRCE, WISeREP, and the sne.space. View All General Astrophysics FAQs →

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The Story of Supernova ASASSN-14bb