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Early warning for newly discovered comets and unconfirmed objects.

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C/2021 F1

C/2021 F1 (Lemmon-PANSTARRS)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 1476 days ago at mag 30.8. Historic peak was mag 14.8. 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

30.8

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

84

Arc unknown

Last observation

1476d ago

Fri, 02 Sep 2022 03:21:36 GMT · COBS consensus

Perihelion

2022-04-06

1.000 au

Peak window

2022-03-28 → 2022-04-09

COBS peak mag 14.8 on 2022-03-31 · perihelion 2022-04-06. Window is those dates ±3 days — not a light-curve fit.

Historic peak

14.8

COBS / analyzed peak 2022-03-31

Catalog ingest

12h ago

Venator last wrote this row 2026-09-16 13:20:19 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

1.000 au

e

0.9960

i

107.00°

Ω

204.00°

ω

147.00°

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/2021 F1 (Lemmon-PANSTARRS)

    Informal: Lemmon-PANSTARRS

    C/2021 F1 · 2026-09-14 18:28:01 UTC → current

Discoverers

  • Lemmon

    Discoverer · parsed-name · 2026-09-16 13:20:19 UTC → current

  • Lemmon-PANSTARRS

    Discoverer · parsed-name · 2026-09-16 13:20:19 UTC → current

  • PANSTARRS

    Discoverer · parsed-name · 2026-09-16 13:20:19 UTC → current

  • Lemmon-PANSTARRS

    Discoverer · parsed-name · 2026-09-14 18:28:01 UTC → 2026-09-16 13:20:19 UTC

Contributors

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