Name: Supernova SN1604A Optical Photometry and Spectroscopy
Creator: Open Supernova Catalog

Question 1

What type of supernova is SN1604A and what kind of star exploded?

Accepted Answer

SN1604A is cataloged as a Type I transient. Mechanism-specific claims (progenitor mass, nickel yield, remnant type) require more than this label and are not asserted here as object-specific measurements.

Question 2

What was the progenitor star doing in the millions of years leading up to SN1604A?

Accepted Answer

The specific progenitor of SN1604A 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 SN1604A.

Question 3

How far away is SN1604A from Earth and how old is the light reaching us?

Accepted Answer

SN1604A has a luminosity distance of approximately 0.0 Million Light-Years. A lookback time is not computed here without a usable redshift; do not interpret the luminosity-distance light-year figure as travel time.

Question 4

What does the cosmological redshift of SN1604A tell us about the expansion of space?

Accepted Answer

No spectroscopic redshift has been measured for SN1604A. Without a published z, its place in the Hubble flow, recession velocity, and lookback time cannot be stated. A redshift requires a spectrum (or a well-calibrated photometric redshift from multi-band imaging). Check the sources below for follow-up spectroscopy.

Question 5

How bright did SN1604A become at its peak, and how many Suns does that equal?

Accepted Answer

At peak brightness, SN1604A achieved an apparent magnitude of -2.95 around 1604/10/28. Corrected for cosmic distance and foreground interstellar dust, its intrinsic absolute magnitude was -16.5. At this peak, the exploding star radiated with the incandescent brilliance of approximately 340.4 million Suns combined, briefly outshining the cumulative starlight of entire dwarf galaxies!

Question 6

How much total energy was released by SN1604A, and where did that energy go?

Accepted Answer

Core-collapse events of this broad class are often discussed with a ~10⁵³ erg gravitational binding energy of which ~99% may escape as neutrinos—again a class scale, not a measured budget for SN1604A.

Question 7

How fast are the supernova ejecta and shockwave of SN1604A expanding through space?

Accepted Answer

No ejecta velocity is measured for SN1604A. 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.

Question 8

What powers the prolonged glow of SN1604A weeks and months after detonation?

Accepted Answer

Classified core-collapse light curves are often sustained after peak by radioactive ⁵⁶Ni → ⁵⁶Co → ⁵⁶Fe decay, with typical nickel yields of order 0.05–0.15 solar masses—again a class scale, not a measured yield for SN1604A. Shock-breakout heating may dominate the earliest optical flash; without a published bolometric fit, neither nickel mass nor the dominant power source is established for this event.

Question 9

What chemical elements did SN1604A create and disperse into the universe?

Accepted Answer

The nucleosynthetic products of SN1604A are unknown because its type is unresolved. Element yields depend directly on the explosion mechanism: a thermonuclear Type Ia produces mostly iron-peak elements such as 56Ni and 56Fe, whereas a core-collapse event produces large quantities of oxygen, neon, magnesium and silicon from successive burning shells. No spectrum has been published for this transient, so which of these occurred is not established.

Question 10

Did SN1604A leave behind a black hole, a neutron star, or nothing at all?

Accepted Answer

A core-collapse explosion associated with SN1604A'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.

Question 11

What will SN1604A's explosion site look like in 1,000 to 10,000 years?

Accepted Answer

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 SN1604A. 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.

Question 12

In which galaxy did SN1604A explode, and where is it located relative to the galactic center?

Accepted Answer

SN1604A is cataloged with host galaxy Milky Way. No secure nuclear offset is published in this record.

Question 13

Where is SN1604A located in the night sky and which constellation is it in?

Accepted Answer

In the celestial sphere, SN1604A is located at Right Ascension 17:30:42 and Declination -21:29, situated in the constellation Scorpius (The Scorpion). Because its declination is -21:29, it is favorably placed for Southern Hemisphere observatories.

Question 14

How much Milky Way interstellar dust obscures our view of SN1604A?

Accepted Answer

Along this line of sight, the catalog records a Milky Way foreground color excess of E(B−V) = 0.2205 mag (source: Analytical Galactic Disk Model (IAU)), corresponding to roughly A_V ≈ 0.68 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.

Question 15

Across which photometric filter bands was SN1604A monitored?

Accepted Answer

SN1604A was tracked across 36 photometric observations across a baseline of 356.0 days utilizing filter bands including V. Data were captured by observatories and survey networks including global optical observatories. Multi-color photometry tracks the temperature evolution of the fireball, verifying the rise time to peak and the rate of radioactive decline.

Question 16

What did astronomical spectroscopy reveal about SN1604A's chemical makeup?

Accepted Answer

No spectrum has been published for SN1604A. 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.

Question 17

Who discovered SN1604A and how was it first detected?

Accepted Answer

SN1604A was officially reported on 1604/10/09 by Altobelli. 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.

Question 18

How many scientific publications and observatories have contributed data to SN1604A?

Accepted Answer

SN1604A is documented across 9 scientific references and archival data sources in the Open Supernova Catalog. These include discovery circulars and research datasets from 2016ApJ...817...36S, 2014BASI...42...47G, 1977hisu.book.....C, Discorso, nel quale si dimostra, che la nuova stella apparita l'Ottobre 1604 non e cometa, ne stella... creata di nuovo... ma una di quelle, che furono da principio nel cielo.. All raw photometry and spectroscopy points are cross-indexed to their original bibliographic records for peer-reviewed verification.

Question 19

What other names and survey identifiers exist for SN1604A?

Accepted Answer

Throughout global alert streams and survey databases, SN1604A has also been designated as: Kepler's supernova, G004.5+06.8, MWSNR 004.5+06.8, Kepler, SN1604, 3C358, V843 Oph, Kepler's Star. 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).

Question 20

How does SN1604A contribute to measuring the Hubble Constant and the scale of the cosmos?

Accepted Answer

SN1604A 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.

Question 21

Could gravitational waves or neutrinos from SN1604A be detected on Earth?

Accepted Answer

No neutrino or gravitational-wave counterpart has been reported for SN1604A, 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.

Question 22

How does SN1604A compare to famous historical supernovae like SN 1987A or the Crab Supernova?

Accepted Answer

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), SN1604A occurred at a distance of 0.0 Million Light-Years. While historical naked-eye supernovae occurred within our Milky Way or its immediate satellites, modern discoveries like SN1604A allow astrophysicists to probe diverse galactic environments, metallicities, and stellar populations across the broader universe.

Question 23

Can I see SN1604A tonight with a backyard telescope or binoculars?

Accepted Answer

Unknown — no measured brightness. SN1604A was discovered 154156 days ago (1604/10/09), 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.

Question 24

Does the radiation or shockwave from SN1604A pose any threat to Earth?

Accepted Answer

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 0.0 Million Light-Years, the inverse-square law dilutes the radiation by quintillions of times, making SN1604A completely harmless to our biosphere and purely a fascinating spectacle for human exploration.

R.A. (J2000)	17:30:42 (262.67500°)
Dec. (J2000)	-21:29 (-21.48333°)
Spectral Type	I
Redshift (z)	—
Recession Velocity	—
Luminosity Distance	0.0051 Mpc
Peak Apparent Mag	-2.95 brightest multi-epoch detection (1604/10/28)
Peak Absolute Mag	-16.5
MW Dust E(B-V)	0.2205 mag (A_V = 0.68 mag) derived from galactic coordinates (Analytical Galactic Disk Model (IAU)), not a dust-map measurement
Host Galaxy	Milky Way
Host Offset	—
Observations	35 detections, 1 upper limit, 0 spectra

ID	Source	Reference	NASA ADS Bibcode
[1]	2016ApJ...817...36S	Sankrit et al. (2016)	`2016ApJ...817...36S`
[2]	2014BASI...42...47G	Green (2014)	`2014BASI...42...47G`
[4]	1977hisu.book.....C	Clark & Stephenson (1977)	`1977hisu.book.....C`
[4]	Discorso, nel quale si dimostra, che la nuova stella apparita l'Ottobre 1604 non e cometa, ne stella... creata di nuovo... ma una di quelle, che furono da principio nel cielo.		`—`
[5]	Galactic SNRs		`—`
[6]	Transient Name Server		`—`
[7]	WikiPedia		`—`
[8]	Latest Supernovae		`—`
[9]	The Open Supernova Catalog	Guillochon et al. (2017)	`2017ApJ...835...64G`

SN1604A

Core Parameters

Interactive Sky Field (Aladin) ✨ DSS2 Optical (China-VO mirror)

Literature & Data Provenance

❓ Frequently Asked Questions About SN1604A

SN1604A

Core Parameters

Interactive Sky Field (Aladin) ✨ DSS2 Optical (China-VO mirror)

Literature & Data Provenance

❓ Frequently Asked Questions About SN1604A

BibTeX Citation Block