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Venator

Early warning for newly discovered comets and unconfirmed objects.

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393P

393P/Spacewatch-Hill

CometClass Ecatalogued
Unknown

Not currently visible. Last report 1252 days ago at mag 21.9. Historic peak was mag 19.8. 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

21.9

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

2

Arc unknown

Last observation

1252d ago

Fri, 14 Apr 2023 01:49:00 GMT · COBS consensus

Perihelion

2030-05-06

4.240 au

Peak window

2019-09-23 → 2030-05-09

COBS peak mag 19.8 on 2019-09-26 · perihelion 2030-05-06. Window is those dates ±3 days — not a light-curve fit.

Historic peak

19.8

COBS / analyzed peak 2019-09-26

Catalog ingest

7m ago

Venator last wrote this row 2026-09-16 23:00:07 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

4.240 au

e

0.1180

i

16.80°

Ω

36.40°

ω

329.00°

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

  • 393P/Spacewatch-Hill

    393P · 2026-09-14 18:27:59 UTC → current

Discoverers

  • Hill

    Discoverer · parsed-name · 2026-09-15 18:25:25 UTC → current

  • Spacewatch

    Discoverer · parsed-name · 2026-09-15 18:25:25 UTC → current

  • Spacewatch-Hill

    Discoverer · parsed-name · 2026-09-15 18:25:25 UTC → current

  • Spacewatch-Hill

    Discoverer · parsed-name · 2026-09-14 18:27:59 UTC → 2026-09-15 18:25:25 UTC

Contributors

  • Giuseppe Pappa

    CCD Observer · PAP04 · 1 reports · last 1780d ago

  • John Maikner

    CCD Observer · MAI01 · 1 reports · last 1252d ago

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