C/2008 D4
C/2008 D4 (STEREO)
Not visible to typical instruments. Current estimate mag 33.0. Historic peak was mag -15.7. Visual and most CCD amateur setups will not see it. Space telescopes or large ground telescopes are the remaining path.
Right ascension
—
J2000
Declination
—
J2000
Estimated magnitude
33.0
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
0
Arc unknown
Last observation
Not in feed
COBS consensus does not publish an observer timestamp. Catalog ingested 53d ago.
Perihelion
2008-02-21
0.005 au
Peak window
2008-02-18 → 2008-02-24
COBS peak mag -15.7 on 2008-02-21 · perihelion 2008-02-21. Window is those dates ±3 days — not a light-curve fit.
Historic peak
-15.7
COBS / analyzed peak 2008-02-21
Catalog ingest
53d ago
Venator last wrote this row 2026-09-14 20:00:20 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
0.005 au
e
1.0000
i
146.00°
Ω
15.70°
ω
77.20°
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
C/2008 D4 (STEREO)
Informal: STEREO
C/2008 D4 · 2026-09-14 18:28:00 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:28:00 UTC → current
Contributors
- No recent COBS visual or CCD reports linked yet.
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.