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Venator

Early warning for newly discovered comets and unconfirmed objects.

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P/2025 C1

P/2025 C1 (ATLAS)

CometClass Ecatalogued

Unknown

Not currently visible. Last report 513 days ago at mag 20.4. Historic peak was mag 16.5. 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

20.4

Professional survey · COBS consensus

Confidence

Class E · priority 60

Observations

Arc unknown

Last observation

513d ago

Thu, 12 Jun 2025 02:06:00 GMT · COBS consensus

Perihelion

2025-02-06

2.750 au

Peak window

2025-02-03 → 2025-04-21

COBS peak mag 16.5 on 2025-04-18 · perihelion 2025-02-06. Window is those dates ±3 days — not a light-curve fit.

Historic peak

16.5

COBS / analyzed peak 2025-04-18

Catalog ingest

2m ago

Venator last wrote this row 2026-11-07 03:30:21 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

2.750 au

0.3460

7.52°

9.08°

187.00°

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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

—

Reporting sources

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

Name history

P/2025 C1 (ATLAS)
Informal: ATLAS
P/2025 C1 · 2026-09-13 22:21:23 UTC → current

Discoverers

ATLAS
Discoverer · parsed-name · 2026-09-13 22:21:23 UTC → current

Contributors

Pieter-Jan Dekelver
CCD Observer · DEK01 · 9 reports · last 558d ago
Kevin Hills
CCD Observer · HIL04 · 7 reports · last 539d ago
Katsumi Yoshimoto
CCD Observer · YOS02 · 3 reports · last 636d ago
Steffen Fritsche
CCD Observer · FRI02 · 3 reports · last 582d ago
Andrew Pearce
CCD Observer · PEA · 2 reports · last 605d ago
Peter Carson
CCD Observer · CAR06 · 2 reports · last 591d ago
Jiarui Xiong
CCD Observer · XIO · 1 reports · last 568d ago
John Maikner
CCD Observer · MAI01 · 1 reports · last 513d ago
Sergey Shurpakov
CCD Observer · SHU · 1 reports · last 558d ago

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