P/2015 TO19
P/2015 TO19 (Lemmon-PANSTARRS)
Not currently visible. Last report 251 days ago at mag 22.3. Historic peak was mag 20.1. Typical backyard telescopes will not show it. HST, JWST, or an 8–10 m class telescope might recover it with a good ephemeris.
Right ascension
—
J2000
Declination
—
J2000
Estimated magnitude
22.3
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
4
Arc unknown
Last observation
251d ago
Fri, 09 Jan 2026 01:00:00 GMT · COBS consensus
Perihelion
2025-11-23
2.910 au
Peak window
2025-11-08 → 2025-11-26
COBS peak mag 20.1 on 2025-11-11 · perihelion 2025-11-23. Window is those dates ±3 days — not a light-curve fit.
Historic peak
20.1
COBS / analyzed peak 2025-11-11
Catalog ingest
13h ago
Venator last wrote this row 2026-09-16 13:20:18 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
2.910 au
e
0.3600
i
6.50°
Ω
322.00°
ω
89.40°
a
—
MOID
—
H
—
H0 / n
—
NEO score
—
PHA score
—
RMS
—
Elongation
—
Reporting sources
COBS comet list
okComet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).
Name history
P/2015 TO19 (Lemmon-PANSTARRS)
Informal: Lemmon-PANSTARRS
P/2015 TO19 · 2026-09-14 18:27:57 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-16 13:20:18 UTC → current
Discoverer · parsed-name · 2026-09-16 13:20:18 UTC → current
Discoverer · parsed-name · 2026-09-16 13:20:18 UTC → current
Discoverer · parsed-name · 2026-09-14 18:27:57 UTC → 2026-09-16 13:20:18 UTC
Contributors
CCD Observer · MAI01 · 4 reports · last 325d ago
CCD Observer · TRA01 · 1 reports · last 251d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.