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C/1977 R1

C/1977 R1 (Kohler)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 17675 days ago at mag 34.2. Historic peak was mag 6.6. 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

34.2

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

826

Arc unknown

Last observation

17675d ago

Thu, 27 Apr 1978 10:33:36 GMT · COBS consensus

Perihelion

1977-11-24

1.010 au

Peak window

1977-11-21 → 1977-11-27

COBS peak mag 6.6 on 1977-11-24 · perihelion 1977-11-24. Window is those dates ±3 days — not a light-curve fit.

Historic peak

6.6

COBS / analyzed peak 1977-11-24

Catalog ingest

11h ago

Venator last wrote this row 2026-09-16 13:20:17 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

1.010 au

e

0.9990

i

48.90°

Ω

182.00°

ω

164.00°

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/1977 R1 (Kohler)

    Informal: Kohler

    C/1977 R1 · 2026-09-14 18:27:57 UTC → current

Discoverers

  • Kohler

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

Contributors

  • Albert F. Jones

    Visual Observer · JON · 54 reports · last 17753d ago

  • Paul Maley

    Visual Observer · MAL · 50 reports · last 17784d ago

  • D. A. Golubev

    Visual Observer · GOL03 · 42 reports · last 17810d ago

  • John E. Bortle

    Visual Observer · BOR · 30 reports · last 17789d ago

  • Graham Keitch

    Visual Observer · KEI · 29 reports · last 17824d ago

  • Charles S Morris

    Visual Observer · MOR · 26 reports · last 17832d ago

  • Gary Kronk

    Visual Observer · KRO02 · 26 reports · last 17812d ago

  • Guy M. Hurst

    Visual Observer · HUR · 22 reports · last 17825d ago

  • Kiyoshi Sakurai

    Visual Observer · SAK · 22 reports · last 17848d ago

  • Roy W. Panther

    Visual Observer · PAN · 22 reports · last 17825d ago

  • D. Dierick

    Visual Observer · DIE · 21 reports · last 17840d ago

  • Stephen OMeara

    Visual Observer · OME · 19 reports · last 17842d ago

  • B. Heyndrickx

    Visual Observer · HEY · 18 reports · last 17834d ago

  • Sadao Sei

    Visual Observer · SEI · 18 reports · last 17844d ago

  • Masaaki Satake

    Visual Observer · SAT · 17 reports · last 17850d ago

  • Akimasa Nakamura

    Visual Observer · NAK01 · 16 reports · last 17849d ago

  • Reinder J. Bouma

    Visual Observer · BOU · 16 reports · last 17842d ago

  • Andrew Pearce

    CCD Observer · PEA · 15 reports · last 17675d ago

  • Harold B. Ridley

    Visual Observer · RID · 15 reports · last 17838d ago

  • J. A. Anastasi

    Visual Observer · ANA · 15 reports · last 17834d ago

  • Kunihiko Taniguchi

    Visual Observer · TAN01 · 15 reports · last 17843d ago

  • Henk Feijth

    Visual Observer · FEI · 14 reports · last 17839d ago

  • James A. Morgan

    Visual Observer · MOR02 · 14 reports · last 17815d ago

  • Jim Deyoung

    Visual Observer · DEY · 14 reports · last 17838d ago

  • Jonathan Shanklin

    Visual Observer · SHA02 · 14 reports · last 17820d ago

  • Shigeo Mitsuma

    Visual Observer · MIT · 13 reports · last 17848d ago

  • Takaaki Takemae

    Visual Observer · TAK01 · 13 reports · last 17844d ago

  • A. G. le Moeur

    Visual Observer · LEM · 12 reports · last 17843d ago

  • H. C. Nightingale

    Visual Observer · NIG · 12 reports · last 17831d ago

  • Kazuhisa Uomi

    Visual Observer · UOM · 12 reports · last 17849d ago

  • Vladimir G. Mormyl

    Visual Observer · MOR04 · 12 reports · last 17815d ago

  • Hitoshi Hasegawa

    Visual Observer · HAS01 · 11 reports · last 17848d ago

  • Tetsuo Yanaka

    Visual Observer · YAN · 11 reports · last 17848d ago

  • Akio Oka

    Visual Observer · OKA03 · 10 reports · last 17849d ago

  • Arthur Kemp

    Visual Observer · KEM · 10 reports · last 17848d ago

  • Kazimieras Cernis

    Visual Observer · CHE03 · 10 reports · last 17862d ago

  • Kentaro Osada

    Visual Observer · OSA · 10 reports · last 17847d ago

  • Kiyonori Okano

    Visual Observer · OKA · 10 reports · last 17867d ago

  • Leo Boethin

    Visual Observer · BOE · 10 reports · last 17781d ago

  • Shigeru Aiyama

    Visual Observer · AIY · 10 reports · last 17848d ago

1–40 of 169

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