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Early warning for newly discovered comets and unconfirmed objects.

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C/2004 R2

C/2004 R2 (ASAS)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 8005 days ago at mag 36.2. Historic peak was mag 2.2. 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

JSONCSV

Right ascension

—

J2000

Declination

—

J2000

Estimated magnitude

36.2

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

29

Arc unknown

Last observation

8005d ago

Sat, 16 Oct 2004 18:43:12 GMT · COBS consensus

Perihelion

2004-09-25

0.115 au

Peak window

2004-09-22 → 2004-09-28

COBS peak mag 2.2 on 2004-09-25 · perihelion 2004-09-25. Window is those dates ±3 days — not a light-curve fit.

Historic peak

2.2

COBS / analyzed peak 2004-09-25

Catalog ingest

11h ago

Venator last wrote this row 2026-09-16 13:20:17 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

0.115 au

e

1.0000

i

63.20°

Ω

183.00°

ω

5.35°

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/2004 R2 (ASAS)

    Informal: ASAS

    C/2004 R2 · 2026-09-14 18:27:56 UTC → current

Discoverers

  • ASAS

    Discoverer · parsed-name · 2026-09-14 18:27:56 UTC → current

Contributors

  • Andrew Pearce

    Visual Observer · PEA · 10 reports · last 8024d ago

  • Albert F. Jones

    Visual Observer · JON · 4 reports · last 8031d ago

  • Stuart Rae

    Visual Observer · RAE · 4 reports · last 8035d ago

  • Michael Mattiazzo

    Visual Observer · MAT08 · 3 reports · last 8032d ago

  • David Seargent

    Visual Observer · SEA · 2 reports · last 8031d ago

  • Alexandre Amorim

    Visual Observer · AMO01 · 1 reports · last 8036d ago

  • Magda Streicher

    Visual Observer · STR03 · 1 reports · last 8040d ago

  • Mike Begbie

    Visual Observer · BEG01 · 1 reports · last 8037d ago

  • Nicolas Biver

    Visual Observer · BIV · 1 reports · last 8005d ago

  • Tim Cooper

    Visual Observer · COO02 · 1 reports · last 8040d ago

  • Walter Robledo

    Visual Observer · ROB06 · 1 reports · last 8038d ago

  • Yoshimi Nagai

    Visual Observer · NAG08 · 1 reports · last 8040d ago

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