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Early warning for newly discovered comets and unconfirmed objects.

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C/1955 O1

C/1955 O1 (Honda)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 25865 days ago at mag 38.8. Historic peak was mag 5.2. Typical backyard telescopes will not show it. HST, JWST, or an 8–10 m class telescope might recover it with a good ephemeris.

Active comet in COBS

JSONCSV

Right ascension

—

J2000

Declination

—

J2000

Estimated magnitude

38.8

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

131

Arc unknown

Last observation

25865d ago

Wed, 23 Nov 1955 17:16:47 GMT · COBS consensus

Perihelion

1955-09-03

0.904 au

Peak window

1955-08-31 → 1955-09-06

COBS peak mag 5.2 on 1955-09-03 · perihelion 1955-09-03. Window is those dates ±3 days — not a light-curve fit.

Historic peak

5.2

COBS / analyzed peak 1955-09-03

Catalog ingest

11h ago

Venator last wrote this row 2026-09-16 13:20:16 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

0.904 au

e

1.0000

i

107.00°

Ω

340.00°

ω

348.00°

a

—

MOID

—

H

—

H0 / n

—

NEO score

—

PHA score

—

RMS

—

Elongation

—

Reporting sources

  • COBS comet list

    ok

    Comet Observation Database magnitudes and perihelion data for the full COBS list (active and inactive).

Name history

  • C/1955 O1 (Honda)

    Informal: Honda

    C/1955 O1 · 2026-09-14 18:27:55 UTC → current

Discoverers

  • Honda

    Discoverer · parsed-name · 2026-09-14 18:27:55 UTC → current

Contributors

  • Max Beyer

    Visual Observer · BEY · 30 reports · last 25865d ago

  • S. K. Vsekhsvyatskij

    Visual Observer · VSE · 20 reports · last 25935d ago

  • Vladimir Znojil

    Visual Observer · ZNO · 19 reports · last 25927d ago

  • A. R. Hamilton

    Visual Observer · HAM · 11 reports · last 25923d ago

  • Michael J. Hendrie

    Visual Observer · HEN · 11 reports · last 25926d ago

  • G. E. Stone

    Visual Observer · STO01 · 10 reports · last 25926d ago

  • A. M. Bakcharev

    Visual Observer · BAK02 · 9 reports · last 25954d ago

  • Roy W. Panther

    Visual Observer · PAN · 9 reports · last 25923d ago

  • A. Merer

    Visual Observer · MER01 · 8 reports · last 25937d ago

  • R. L. Waterfield

    Visual Observer · WAT · 8 reports · last 25911d ago

  • Gordon E. Taylor

    Visual Observer · TAY02 · 3 reports · last 25937d ago

  • A. T. Soper

    Visual Observer · SOP · 2 reports · last 25955d ago

  • G.E.D. Alcock

    Visual Observer · ALC · 2 reports · last 25969d ago

  • E. H. Collinson

    Visual Observer · COL01 · 1 reports · last 25964d ago

  • H. C. Taylor

    Visual Observer · TAY01 · 1 reports · last 25962d ago

  • S. W. Milbourn

    Visual Observer · MIL01 · 1 reports · last 25966d ago

Pips are observation weight on this object (log of report count). Hover for catalog-wide weight.