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Venator

Early warning for newly discovered comets and unconfirmed objects.

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P/2011 W2

P/2011 W2 (Rinner)

CometClass Ecatalogued
Northern hemisphere

Difficult — CCD / large telescope. Around mag 14.8. A large amateur CCD or a professional telescope is required.

Active comet in COBS

JSONCSV

Right ascension

07h 42m 28s

J2000

Declination

+13° 17′ 32″

J2000

Estimated magnitude

14.8

CCD / citizen telescope · COBS consensus

Confidence

33

Class E · priority 76

Observations

42

80.00 d arc

Last observation

8d ago

Tue, 08 Sep 2026 19:57:21 GMT · COBS consensus

Perihelion

2019-04-09

2.310 au

Peak window

2018-11-27 → 2019-04-12

COBS peak mag 13.9 on 2018-11-30 · perihelion 2019-04-09. Window is those dates ±3 days — not a light-curve fit.

Historic peak

13.9

COBS / analyzed peak 2018-11-30

Catalog ingest

13m ago

Venator last wrote this row 2026-09-16 22:00:03 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

0.3920

i

13.80°

Ω

232.00°

ω

221.00°

a

3.810 au

MOID

—

H

—

H0 / n

9.0 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

59°

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

  • P/2011 W2 (Rinner)

    Informal: Rinner

    P/2011 W2 · 2026-09-08 02:09:56 UTC → current

Discoverers

  • Rinner

    Discoverer · parsed-name · 2026-09-08 17:27:23 UTC → current

Contributors

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