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Venator

Early warning for newly discovered comets and unconfirmed objects.

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11P

11P/Tempel-Swift-LINEAR

CometClass Ecatalogued
Northern hemisphere

Difficult — CCD / large telescope. Around mag 17.5. A large amateur CCD or a professional telescope is required. Historic peak was mag 16.1.

Active comet in COBS

JSONCSV

Right ascension

01h 34m 45s

J2000

Declination

+38° 42′ 58″

J2000

Estimated magnitude

17.5

CCD / citizen telescope · COBS consensus

Confidence

33

Class E · priority 66

Observations

117

Arc unknown

Last observation

29h ago

Wed, 16 Sep 2026 22:19:11 GMT · COBS consensus

Perihelion

2026-11-09

1.390 au

Peak window

2026-11-06 → 2026-11-15

COBS peak mag 16.1 on 2026-11-12 · perihelion 2026-11-09. Window is those dates ±3 days — not a light-curve fit.

Historic peak

16.1

COBS / analyzed peak 2026-11-12

Catalog ingest

13m ago

Venator last wrote this row 2026-09-18 03:00:05 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

1.390 au

e

0.5770

i

14.40°

Ω

239.00°

ω

168.00°

a

3.280 au

MOID

—

H

—

H0 / n

16.7 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

131°

Reporting sources

  • COBS comet list

    ok

    Comet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).

  • COBS orbits

    ok

    Osculating elements and photometric parameters (H0, n) for active comets.

Name history

  • 11P/Tempel-Swift-LINEAR

    11P · 2026-09-13 22:21:22 UTC → current

Discoverers

  • LINEAR

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Swift

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Tempel

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Tempel-Swift-LINEAR

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • Tempel-Swift-LINEAR

    Discoverer · parsed-name · 2026-09-13 22:21:22 UTC → 2026-09-15 02:51:49 UTC

Contributors

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