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Early warning for newly discovered comets and unconfirmed objects.

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C/1993 F2

C/1993 F2 (Shoemaker-Levy 9)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 11785 days ago at mag 45.7. Historic peak was mag 19.6. 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

45.7

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

28

Arc unknown

Last observation

11785d ago

Sat, 11 Jun 1994 21:50:24 GMT · COBS consensus

Perihelion

1994-08-21

4.760 au

Peak window

1994-08-18 → 1994-08-24

COBS peak mag 19.6 on 1994-08-21 · perihelion 1994-08-21. Window is those dates ±3 days — not a light-curve fit.

Historic peak

19.6

COBS / analyzed peak 1994-08-21

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.

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

4.760 au

e

10.0000

i

160.00°

Ω

207.00°

ω

43.50°

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/1993 F2 (Shoemaker-Levy 9)

    Informal: Shoemaker-Levy 9

    C/1993 F2 · 2026-09-14 18:27:55 UTC → current

Discoverers

  • Shoemaker-Levy 9

    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.