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C/2006 WD4

C/2006 WD4 (Lemmon)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 7030 days ago at mag 40.5. Historic peak was mag 12.4. 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

40.5

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

8

Arc unknown

Last observation

7030d ago

Mon, 18 Jun 2007 21:07:11 GMT · COBS consensus

Perihelion

2007-04-30

0.605 au

Peak window

2007-04-27 → 2007-05-26

COBS peak mag 12.4 on 2007-05-23 · perihelion 2007-04-30. Window is those dates ±3 days — not a light-curve fit.

Historic peak

12.4

COBS / analyzed peak 2007-05-23

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

0.605 au

e

0.9990

i

153.00°

Ω

228.00°

ω

294.00°

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/2006 WD4 (Lemmon)

    Informal: Lemmon

    C/2006 WD4 · 2026-09-14 18:27:55 UTC → current

Discoverers

  • Lemmon

    Discoverer · parsed-name · 2026-09-14 18:27:55 UTC → current

Contributors

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