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Early warning for newly discovered comets and unconfirmed objects.

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C/2024 J2

C/2024 J2 (Wierzchos)

CometClass Ecatalogued

Unknown

Not currently visible. Last report 293 days ago at mag 23.1. Historic peak was mag 16.2. Typical backyard telescopes will not show it. HST, JWST, or an 8–10 m class telescope might recover it with a good ephemeris.

Active comet in COBS

JSON CSV

Right ascension

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J2000

Declination

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J2000

Estimated magnitude

23.1

Professional survey · COBS consensus

Confidence

Class E · priority 60

Observations

Arc unknown

Last observation

293d ago

Fri, 28 Nov 2025 13:55:11 GMT · COBS consensus

Perihelion

2025-03-19

1.810 au

Peak window

2025-02-25 → 2025-03-22

COBS peak mag 16.2 on 2025-02-28 · perihelion 2025-03-19. Window is those dates ±3 days — not a light-curve fit.

Historic peak

16.2

COBS / analyzed peak 2025-02-28

Catalog ingest

15h ago

Venator last wrote this row 2026-09-16 13:20:20 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

1.810 au

0.9880

79.30°

189.00°

143.00°

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MOID

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H0 / n

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NEO score

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PHA score

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RMS

—

Elongation

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Reporting sources

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

Name history

C/2024 J2 (Wierzchos)
Informal: Wierzchos
C/2024 J2 · 2026-09-14 18:28:02 UTC → current

Discoverers

Wierzchos
Discoverer · parsed-name · 2026-09-14 18:28:02 UTC → current

Contributors

Andrew Pearce
CCD Observer · PEA · 17 reports · last 293d ago
Pieter-Jan Dekelver
CCD Observer · DEK01 · 9 reports · last 592d ago
Thomas Lehmann
CCD Observer · LEH02 · 6 reports · last 391d ago
Steffen Fritsche
CCD Observer · FRI02 · 4 reports · last 606d ago
Kevin Hills
CCD Observer · HIL04 · 2 reports · last 391d ago
Martin Mašek
CCD Observer · MAS01 · 2 reports · last 419d ago
Jure Zakrajšek
CCD Observer · ZAK · 1 reports · last 630d ago
Peter Carson
CCD Observer · CAR06 · 1 reports · last 410d ago
Sergey Shurpakov
CCD Observer · SHU · 1 reports · last 635d ago

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