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C/1956 E1

C/1956 E1 (Mrkos)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 25715 days ago at mag 38.8. Historic peak was mag 7.0. 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

17

Arc unknown

Last observation

25715d ago

Sun, 22 Apr 1956 07:12:00 GMT · COBS consensus

Perihelion

1956-02-21

0.865 au

Peak window

1956-02-18 → 1956-02-24

COBS peak mag 7.0 on 1956-02-21 · perihelion 1956-02-21. Window is those dates ±3 days — not a light-curve fit.

Historic peak

7.0

COBS / analyzed peak 1956-02-21

Catalog ingest

12h 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

0.865 au

e

1.0000

i

147.00°

Ω

225.00°

ω

80.00°

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/1956 E1 (Mrkos)

    Informal: Mrkos

    C/1956 E1 · 2026-09-14 18:27:55 UTC → current

Discoverers

  • Mrkos

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

Contributors

  • Max Beyer

    Visual Observer · BEY · 9 reports · last 25724d ago

  • G.E.D. Alcock

    Visual Observer · ALC · 2 reports · last 25727d ago

  • A. M. Bakcharev

    Visual Observer · BAK02 · 1 reports · last 25752d ago

  • David D. Meisel

    Visual Observer · MEI01 · 1 reports · last 25715d ago

  • G. Merton

    Visual Observer · MER02 · 1 reports · last 25734d ago

  • Roy W. Panther

    Visual Observer · PAN · 1 reports · last 25737d ago

  • Vladimir Znojil

    Visual Observer · ZNO · 1 reports · last 25731d ago

  • W. H. Steavenson

    Visual Observer · STE06 · 1 reports · last 25731d ago

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