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Venator

Early warning for newly discovered comets and unconfirmed objects.

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C/2023 A3

C/2023 A3 (Tsuchinshan-ATLAS)

CometClass Ecatalogued
Unknown

Not visible to typical instruments. Current estimate mag 18.5. Historic peak was mag 3.0. Visual and most CCD amateur setups will not see it. Space telescopes or large ground telescopes are the remaining path.

Active comet in COBS

JSONCSV

Right ascension

—

J2000

Declination

—

J2000

Estimated magnitude

18.5

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

2625

Arc unknown

Last observation

58d ago

Mon, 20 Jul 2026 21:50:24 GMT · COBS consensus

Perihelion

2024-09-27

0.391 au

Peak window

2024-09-24 → 2024-09-30

COBS peak mag 3.0 on 2024-09-27 · perihelion 2024-09-27. Window is those dates ±3 days — not a light-curve fit.

Historic peak

3.0

COBS / analyzed peak 2024-09-27

Catalog ingest

14m ago

Venator last wrote this row 2026-09-16 22:00:04 UTC

Light curve

Brightness over time (V mag)

Gold = reported observations. Steel dashed family = ensemble (nominal / outburst / fade / disruption).

Tail length

Converted to degrees from COBS (d / arcmin / arcsec). Empty until analysis has pulled the archive.

Ensemble is a first-pass H0/n photometric model plus observed samples — not a trained ML forecast yet. The background analyzer walks the catalog one object at a time so COBS is not flooded. Disruption track rises after perihelion to stand in for solar-wind stripping.

Orbital elements

q

0.391 au

e

1.0000

i

139.00°

Ω

21.70°

ω

309.00°

a

—

MOID

—

H

—

H0 / n

—

NEO score

—

PHA score

—

RMS

—

Elongation

—

Reporting sources

  • COBS comet list

    ok

    Comet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).

Name history

  • C/2023 A3 (Tsuchinshan-ATLAS)

    Informal: Tsuchinshan-ATLAS

    C/2023 A3 · 2026-09-13 22:21:23 UTC → current

Discoverers

  • ATLAS

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Tsuchinshan

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Tsuchinshan-ATLAS

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Tsuchinshan-ATLAS

    Discoverer · parsed-name · 2026-09-13 22:21:23 UTC → 2026-09-15 02:51:49 UTC

Contributors

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Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.