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Venator

Early warning for newly discovered comets and unconfirmed objects.

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P/2010 A1

P/2010 A1 (Hill)

CometClass Ecatalogued
Southern hemisphere

Not currently visible. Last report 2820 days ago at mag 17.7. Historic peak was mag 11.9. 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

19h 42m 49s

J2000

Declination

−33° 16′ 01″

J2000

Estimated magnitude

17.7

CCD / citizen telescope · COBS consensus

Confidence

33

Class E · priority 66

Observations

10

Arc unknown

Last observation

2820d ago

Thu, 27 Dec 2018 23:16:47 GMT · COBS consensus

Perihelion

2027-12-18

1.950 au

Peak window

2027-11-14 → 2027-12-21

COBS peak mag 11.9 on 2027-11-17 · perihelion 2027-12-18. Window is those dates ±3 days — not a light-curve fit.

Historic peak

11.9

COBS / analyzed peak 2027-11-17

Catalog ingest

22m ago

Venator last wrote this row 2026-09-17 04:00:04 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

1.950 au

e

0.5550

i

10.30°

Ω

47.20°

ω

13.30°

a

4.370 au

MOID

—

H

—

H0 / n

9.0 / 4

NEO score

—

PHA score

—

RMS

—

Elongation

117°

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/2010 A1 (Hill)

    Informal: Hill

    P/2010 A1 · 2026-09-13 22:21:22 UTC → current

Discoverers

  • Hill

    Discoverer · parsed-name · 2026-09-13 22:21:22 UTC → current

Contributors

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