C/1984 A1
C/1984 A1 (Bradfield)
Not currently visible. Last report 15482 days ago at mag 35.0. Historic peak was mag 13.0. 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
35.0
Professional survey · COBS consensus
Confidence
33
Class E · priority 60
Observations
31
Arc unknown
Last observation
15482d ago
Fri, 27 Apr 1984 18:57:35 GMT · COBS consensus
Perihelion
1983-11-15
1.370 au
Peak window
1983-11-12 → 1983-11-25
COBS peak mag 13.0 on 1983-11-22 · perihelion 1983-11-15. Window is those dates ±3 days — not a light-curve fit.
Historic peak
13.0
COBS / analyzed peak 1983-11-22
Catalog ingest
11h 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.
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
1.370 au
e
0.9500
i
52.00°
Ω
357.00°
ω
219.00°
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
C/1984 A1 (Bradfield)
Informal: Bradfield
C/1984 A1 · 2026-09-14 18:27:57 UTC → current
Discoverers
Discoverer · parsed-name · 2026-09-14 18:27:57 UTC → current
Contributors
CCD Observer · PEA · 21 reports · last 15482d ago
Visual Observer · PEA · 7 reports · last 15572d ago
Visual Observer · CLA · 4 reports · last 15572d ago
Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.