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Venator

Early warning for newly discovered comets and unconfirmed objects.

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C/2025 R3

C/2025 R3 (PANSTARRS)

CometClass Ecatalogued
Both hemispheres

Not visible to typical instruments. Current estimate mag 19.8. Historic peak was mag 8.1. 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

04h 27m 46s

J2000

Declination

+01° 52′ 12″

J2000

Estimated magnitude

19.8

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

691

Arc unknown

Last observation

135d ago

Thu, 25 Jun 2026 10:39:53 GMT · COBS consensus

Perihelion

2026-04-19

0.499 au

Peak window

2026-04-16 → 2026-04-22

COBS peak mag 8.1 on 2026-04-19 · perihelion 2026-04-19. Window is those dates ±3 days — not a light-curve fit.

Historic peak

8.1

COBS / analyzed peak 2026-04-19

Catalog ingest

15m ago

Venator last wrote this row 2026-11-07 03:00:09 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

0.499 au

e

1.0000

i

125.00°

Ω

38.70°

ω

162.00°

a

-1460.000 au

MOID

—

H

—

H0 / n

8.7 / 6.2

NEO score

—

PHA score

—

RMS

—

Elongation

121°

Reporting sources

  • COBS comet list

    ok

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

  • COBS orbits

    ok

    Osculating elements and photometric parameters (H0, n) for active comets.

Name history

  • C/2025 R3 (PANSTARRS)

    Informal: PANSTARRS

    C/2025 R3 · 2026-09-13 22:21:23 UTC → current

Discoverers

  • PANSTARRS

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

Contributors

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