comets.venator.space

Venator

Early warning for newly discovered comets and unconfirmed objects.

Back to Contributors

C/2017 E1

C/2017 E1 (Borisov)

CometClass Ecatalogued
Unknown

Not currently visible. Last report 3427 days ago at mag 34.8. Historic peak was mag 14.5. 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

34.8

Professional survey · COBS consensus

Confidence

33

Class E · priority 60

Observations

27

Arc unknown

Last observation

3427d ago

Sun, 30 Apr 2017 08:24:00 GMT · COBS consensus

Perihelion

2017-04-05

0.920 au

Peak window

2017-03-31 → 2017-04-08

COBS peak mag 14.5 on 2017-04-03 · perihelion 2017-04-05. Window is those dates ±3 days — not a light-curve fit.

Historic peak

14.5

COBS / analyzed peak 2017-04-03

Catalog ingest

12h 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

0.920 au

e

1.0000

i

14.50°

Ω

143.00°

ω

153.00°

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/2017 E1 (Borisov)

    Informal: Borisov

    C/2017 E1 · 2026-09-14 18:27:58 UTC → current

Discoverers

  • Borisov

    Discoverer · parsed-name · 2026-09-14 18:27:58 UTC → current

Contributors

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