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Early warning for newly discovered comets and unconfirmed objects.

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C/1975 N1

C/1975 N1 (Kobayashi-Berger-Milon)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 18570 days ago at mag 34.3. Historic peak was mag 2.5. 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

34.3

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

711

Arc unknown

Last observation

18570d ago

Thu, 13 Nov 1975 16:33:35 GMT · COBS consensus

Perihelion

1975-09-04

0.413 au

Peak window

1975-09-01 → 1975-09-07

COBS peak mag 2.5 on 1975-09-04 · perihelion 1975-09-04. Window is those dates ±3 days — not a light-curve fit.

Historic peak

2.5

COBS / analyzed peak 1975-09-04

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

0.413 au

e

1.0000

i

81.40°

Ω

295.00°

ω

117.00°

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/1975 N1 (Kobayashi-Berger-Milon)

    Informal: Kobayashi-Berger-Milon

    C/1975 N1 · 2026-09-14 18:27:57 UTC → current

Discoverers

Contributors

  • Jonathan Shanklin

    Visual Observer · SHA02 · 42 reports · last 18641d ago

  • John E. Bortle

    Visual Observer · BOR · 31 reports · last 18594d ago

  • Max Beyer

    Visual Observer · BEY · 31 reports · last 18646d ago

  • Kazimieras Cernis

    Visual Observer · CHE03 · 29 reports · last 18641d ago

  • Michael Moller

    Visual Observer · MOE · 26 reports · last 18646d ago

  • Clay Sherrod

    Visual Observer · SHE · 25 reports · last 18650d ago

  • Kurt Wenske

    Visual Observer · WEN01 · 25 reports · last 18652d ago

  • A. G. le Moeur

    Visual Observer · LEM · 23 reports · last 18648d ago

  • Georg Comello

    Visual Observer · COM · 22 reports · last 18666d ago

  • Tristram Brelstaff

    Visual Observer · BRE · 22 reports · last 18649d ago

  • Guy M. Hurst

    Visual Observer · HUR · 21 reports · last 18648d ago

  • Horace A. Smith

    Visual Observer · SMI · 21 reports · last 18652d ago

  • P. B. Doherty

    Visual Observer · DOH · 21 reports · last 18647d ago

  • R. B. Minton

    Visual Observer · MIN · 21 reports · last 18650d ago

  • Daniel W. E. Green

    Visual Observer · GRE · 18 reports · last 18601d ago

  • Harold B. Ridley

    Visual Observer · RID · 18 reports · last 18647d ago

  • Roy W. Panther

    Visual Observer · PAN · 18 reports · last 18649d ago

  • J. Lewis

    Visual Observer · LEW · 17 reports · last 18651d ago

  • Stephen OMeara

    Visual Observer · OME · 17 reports · last 18652d ago

  • G.E.D. Alcock

    Visual Observer · ALC · 16 reports · last 18677d ago

  • Henk Feijth

    Visual Observer · FEI · 16 reports · last 18673d ago

  • I. D. Howarth

    Visual Observer · HOW · 16 reports · last 18651d ago

  • Karl Simmons

    Visual Observer · SIM · 16 reports · last 18663d ago

  • Rainer Lukas

    Visual Observer · LUK · 16 reports · last 18665d ago

  • Leonard Matuszewski

    Visual Observer · MAT02 · 15 reports · last 18666d ago

  • David D. Weier

    Visual Observer · WEI · 14 reports · last 18649d ago

  • K. M. Sturdy

    Visual Observer · STU · 13 reports · last 18647d ago

  • N.A. van de Mey

    Visual Observer · VAN · 13 reports · last 18673d ago

  • Richard A. Keen

    Visual Observer · KEE · 13 reports · last 18644d ago

  • Timothy Robertson

    Visual Observer · ROB · 13 reports · last 18661d ago

  • Ilmo Kukkonen

    Visual Observer · KUK01 · 12 reports · last 18649d ago

  • J. S. Bullivant

    Visual Observer · BUL · 12 reports · last 18658d ago

  • Dennis Milon

    Visual Observer · MIL · 11 reports · last 18610d ago

  • M. A. Hather

    Visual Observer · HAT · 11 reports · last 18666d ago

  • Mark Jones

    Visual Observer · JON02 · 11 reports · last 18665d ago

  • Michael J. Hendrie

    Visual Observer · HEN · 11 reports · last 18662d ago

  • Peter Bus

    Visual Observer · BUS01 · 11 reports · last 18673d ago

  • S. W. Milbourn

    Visual Observer · MIL01 · 11 reports · last 18662d ago

  • A. Driscole

    Visual Observer · DRI · 10 reports · last 18663d ago

  • E.K. Wubbena

    Visual Observer · WUB · 10 reports · last 18673d ago

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