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C/1965 S2

C/1965 S2 (Alcock)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 22205 days ago at mag 42.8. Historic peak was mag 15.6. 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

42.8

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

24

Arc unknown

Last observation

22205d ago

Tue, 30 Nov 1965 17:16:47 GMT · COBS consensus

Perihelion

1965-11-02

1.330 au

Peak window

1965-10-23 → 1965-11-05

COBS peak mag 15.6 on 1965-10-26 · perihelion 1965-11-02. Window is those dates ±3 days — not a light-curve fit.

Historic peak

15.6

COBS / analyzed peak 1965-10-26

Catalog ingest

13h 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.

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

1.330 au

e

0.9980

i

65.00°

Ω

176.00°

ω

151.00°

a

—

MOID

—

H

—

H0 / n

—

NEO score

—

PHA score

—

RMS

—

Elongation

—

Reporting sources

  • COBS comet list

    down

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

Name history

  • C/1965 S2 (Alcock)

    Informal: Alcock

    C/1965 S2 · 2026-09-14 18:27:57 UTC → current

Discoverers

  • Alcock

    Discoverer · parsed-name · 2026-09-14 18:27:57 UTC → current

Contributors

  • Max Beyer

    Visual Observer · BEY · 19 reports · last 22205d ago

  • Ch. Raudsar

    Visual Observer · RAU01 · 3 reports · last 22264d ago

  • Karl Simmons

    Visual Observer · SIM · 1 reports · last 22259d ago

  • Michael McCants

    Visual Observer · MCC03 · 1 reports · last 22249d ago

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