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Early warning for newly discovered comets and unconfirmed objects.

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C/2026 M3

C/2026 M3 (MASTER)

CometClass Ecatalogued
Unknown

Not visible to typical instruments. Current estimate mag 20.1. 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

—

J2000

Declination

—

J2000

Estimated magnitude

20.1

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

4

Arc unknown

Last observation

25d ago

Sat, 22 Aug 2026 20:44:23 GMT · COBS consensus

Perihelion

2027-02-16

12.000 au

Peak window

2026-07-01 → 2027-02-19

COBS peak mag 20.0 on 2026-07-04 · perihelion 2027-02-16. Window is those dates ±3 days — not a light-curve fit.

Historic peak

20.0

COBS / analyzed peak 2026-07-04

Catalog ingest

1m ago

Venator last wrote this row 2026-09-17 00:00:08 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.

No tail measures stored yet for this object.

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

12.000 au

e

1.0000

i

93.90°

Ω

282.00°

ω

51.20°

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/2026 M3 (MASTER)

    Informal: MASTER

    C/2026 M3 · 2026-09-14 18:28:03 UTC → current

Discoverers

  • MASTER

    Discoverer · parsed-name · 2026-09-14 18:28:03 UTC → current

Contributors

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