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Venator

Early warning for newly discovered comets and unconfirmed objects.

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C/2013 C2

C/2013 C2 (Tenagra)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 392 days ago at mag 21.9. Historic peak was mag 18.2. 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

51

Arc unknown

Last observation

392d ago

Sat, 11 Oct 2025 00:08:00 GMT · COBS consensus

Perihelion

2015-08-31

9.110 au

Peak window

2015-04-03 → 2015-09-03

COBS peak mag 18.2 on 2015-04-06 · perihelion 2015-08-31. Window is those dates ±3 days — not a light-curve fit.

Historic peak

18.2

COBS / analyzed peak 2015-04-06

Catalog ingest

14m ago

Venator last wrote this row 2026-11-07 03:00:09 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

9.110 au

e

0.4260

i

21.40°

Ω

248.00°

ω

309.00°

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/2013 C2 (Tenagra)

    Informal: Tenagra

    C/2013 C2 · 2026-09-14 18:27:55 UTC → current

Discoverers

  • Tenagra

    Discoverer · parsed-name · 2026-09-14 18:27:55 UTC → current

Contributors

  • Kevin Hills

    CCD Observer · HIL04 · 36 reports · last 3485d ago

  • Roger Dymock

    CCD Observer · DYM · 9 reports · last 3842d ago

  • Marco Goiato

    Visual Observer · GOI · 3 reports · last 4248d ago

  • John Maikner

    CCD Observer · MAI01 · 1 reports · last 392d ago

  • Nirmal Paul

    CCD Observer · PAU02 · 1 reports · last 4251d ago

  • Taras Prystavski

    CCD Observer · PRY01 · 1 reports · last 4269d ago

  • Thomas Lehmann

    CCD Observer · LEH02 · 1 reports · last 4229d ago

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