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Early warning for newly discovered comets and unconfirmed objects.

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P/2013 TL117

P/2013 TL117 (Lemmon)

CometClass Ecatalogued
Southern hemisphere

Not currently visible. Last report 1986 days ago at mag 17.4. Historic peak was mag 7.9. 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

22h 18m 03s

J2000

Declination

−16° 36′ 53″

J2000

Estimated magnitude

17.4

CCD / citizen telescope · COBS consensus

Confidence

33

Class E · priority 66

Observations

21

Arc unknown

Last observation

1986d ago

Sat, 10 Apr 2021 02:09:35 GMT · COBS consensus

Perihelion

2020-12-24

1.120 au

Peak window

2020-12-17 → 2020-12-27

COBS peak mag 7.9 on 2020-12-20 · perihelion 2020-12-24. Window is those dates ±3 days — not a light-curve fit.

Historic peak

7.9

COBS / analyzed peak 2020-12-20

Catalog ingest

23m ago

Venator last wrote this row 2026-09-17 01:00:04 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

1.120 au

e

0.6890

i

9.36°

Ω

3.31°

ω

112.00°

a

3.610 au

MOID

—

H

—

H0 / n

9.0 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

156°

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/2013 TL117 (Lemmon)

    Informal: Lemmon

    P/2013 TL117 · 2026-09-13 22:21:22 UTC → current

Discoverers

  • Lemmon

    Discoverer · parsed-name · 2026-09-13 22:21:22 UTC → current

Contributors

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