508P
508P/McNaught
Not currently visible. Last report 390 days ago at mag 24.7. Historic peak was mag 18.3. 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
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J2000
Estimated magnitude
24.7
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
2
Arc unknown
Last observation
390d ago
Sat, 23 Aug 2025 01:01:00 GMT · COBS consensus
Perihelion
2025-07-11
1.540 au
Peak window
2025-06-17 → 2025-07-14
COBS peak mag 18.3 on 2025-06-20 · perihelion 2025-07-11. Window is those dates ±3 days — not a light-curve fit.
Historic peak
18.3
COBS / analyzed peak 2025-06-20
Catalog ingest
10h ago
Venator last wrote this row 2026-09-16 13:20:20 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
1.540 au
e
0.5690
i
31.70°
Ω
269.00°
ω
339.00°
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
508P/McNaught
508P · 2026-09-14 18:28:02 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:28:02 UTC → current
Contributors
CCD Observer · NAK01 · 1 reports · last 7794d ago
CCD Observer · MAI01 · 1 reports · last 390d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.