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Early warning for newly discovered comets and unconfirmed objects.

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P/2004 V5-A

P/2004 V5-A (LINEAR-Hill)

CometClass Ecatalogued
Northern hemisphere

Not currently visible. Last report 7864 days ago at mag 17.8. 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

07h 47m 15s

J2000

Declination

+38° 37′ 59″

J2000

Estimated magnitude

17.8

CCD / citizen telescope · COBS consensus

Confidence

33

Class E · priority 66

Observations

8

Arc unknown

Last observation

7864d ago

Wed, 27 Apr 2005 12:57:35 GMT · COBS consensus

Perihelion

2027-08-04

4.430 au

Peak window

2027-08-01 → 2050-04-24

COBS peak mag 17.8 on 2050-04-21 · perihelion 2027-08-04. Window is those dates ±3 days — not a light-curve fit.

Historic peak

17.8

COBS / analyzed peak 2050-04-21

Catalog ingest

23m ago

Venator last wrote this row 2026-11-07 03:30:21 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

4.430 au

e

0.4510

i

19.30°

Ω

47.70°

ω

87.10°

a

8.080 au

MOID

—

H

—

H0 / n

8.0 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

111°

Reporting sources

  • COBS comet list

    ok

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

  • COBS orbits

    ok

    Osculating elements and photometric parameters (H0, n) for active comets.

Name history

  • P/2004 V5-A (LINEAR-Hill)

    Informal: LINEAR-Hill

    P/2004 V5-A · 2026-09-13 22:21:23 UTC → current

Discoverers

  • Hill

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • LINEAR

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • LINEAR-Hill

    Discoverer · parsed-name · 2026-09-15 02:51:49 UTC → current

  • LINEAR-Hill

    Discoverer · parsed-name · 2026-09-13 22:21:23 UTC → 2026-09-15 02:51:49 UTC

Contributors

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