128P-B
128P-B/Shoemaker-Holt
Difficult — CCD / large telescope. Around mag 16.0. A large amateur CCD or a professional telescope is required. Historic peak was mag 14.9.
Right ascension
07h 01m 26s
J2000
Declination
+19° 27′ 30″
J2000
Estimated magnitude
16.0
CCD / citizen telescope · COBS consensus
Confidence
33
Class E · priority 66
Observations
0
Arc unknown
Last observation
Not in feed
COBS consensus does not publish an observer timestamp. Catalog ingested 8m ago.
Perihelion
1997-11-20
3.050 au
Peak window
1997-11-17 → 1997-11-29
COBS peak mag 14.9 on 1997-11-26 · perihelion 1997-11-20. Window is those dates ±3 days — not a light-curve fit.
Historic peak
14.9
COBS / analyzed peak 1997-11-26
Catalog ingest
8m ago
Venator last wrote this row 2026-09-16 23:00:05 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
3.050 au
e
0.3210
i
4.36°
Ω
215.00°
ω
210.00°
a
4.490 au
MOID
—
H
—
H0 / n
8.5 / 4
NEO score
—
PHA score
—
RMS
—
Elongation
69°
Reporting sources
COBS comet list
okComet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).
COBS orbits
okOsculating elements and photometric parameters (H0, n) for active comets.
Name history
128P-B/Shoemaker-Holt
128P-B · 2026-09-13 22:21:22 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-13 22:21:22 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.