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Early warning for newly discovered comets and unconfirmed objects.

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175P

175P/Hergenrother

CometClass Ecatalogued
Unknown

Not currently visible. Last report 243 days ago at mag 20.3. 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

20.3

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

38

Arc unknown

Last observation

243d ago

Mon, 09 Mar 2026 00:31:00 GMT · COBS consensus

Perihelion

2026-09-03

2.310 au

Peak window

2026-03-01 → 2026-09-06

COBS peak mag 19.5 on 2026-03-04 · perihelion 2026-09-03. Window is those dates ±3 days — not a light-curve fit.

Historic peak

19.5

COBS / analyzed peak 2026-03-04

Catalog ingest

3m ago

Venator last wrote this row 2026-11-07 03:55:36 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

2.310 au

e

0.3740

i

4.93°

Ω

110.00°

ω

74.60°

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

  • 175P/Hergenrother

    175P · 2026-09-14 18:27:54 UTC → current

Discoverers

  • Hergenrother

    Discoverer · parsed-name · 2026-09-14 18:27:54 UTC → current

Contributors

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