August 19, 1885

SN 1885A

Isaac Ward makes a disputed early sighting of S Andromedae

The man who later claimed the 19 August sighting made no immediate public announcement — and his brightness estimate is the main reason historians doubt the claim.

A claim made after the fact

The Irish amateur astronomer Isaac W. Ward later said that on 19 August 1885 he had seen a star-like object near the centre of the Andromeda nebula from Belfast.

He reported an estimated magnitude of about 9.5, apparently using an 11-centimetre refractor, and did not publish or announce the observation at the time.

Why the estimate does not fit

Ernst Hartwig independently detected the object at Dorpat Observatory the next night and judged it magnitude 6–6.5 or brighter — far brighter than Ward's figure only a night earlier.

Ward's estimate is difficult to reconcile with Hartwig's and with the reconstructed light curve, which places maximum at visual magnitude 5.85 on 21–22 August and an early decline of two magnitudes in 12.5 days. Historians therefore question the claim.

Ludovic Gully had reported a bright star at the centre of M31 while testing a telescope in Rouen on 17 August, which may be the earliest positive sighting of all.

Sighting, discovery and announcement are three claims

No public discovery announcement occurred on 19 August. Hartwig's 20 August detection is generally treated as the discovery because it was verified, and he telegraphed the announcement on 31 August.

The object is now identified as SN 1885A, a peculiar and probably subluminous thermonuclear supernova in the Andromeda Galaxy.

That extragalactic reading was not available in 1885: astronomers had not yet established that the Andromeda nebula was a separate galaxy.

Sources

Researched 23 Aug 2026 6 sources 2 audit passes, 1 issue open Date disputed

How this was checked

Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →

Date disputed. Sources disagree about when this happened.

What the sources leave uncertain

The listed date is not the secure discovery date. Ward's 19 August observation was reported retrospectively and is questioned because its magnitude is inconsistent with neighboring observations.
Gully's 17 August report may be the earliest positive sighting, although it conflicts with some negative observations and was not promptly announced.
Hartwig's 20 August detection is generally treated as the discovery because it was verified and led to the public alert.
Modern reconstruction places maximum light on 21–22 August, not unambiguously on one day.