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Sharpless 188

LBN 633

Set a site to see tonight's sky

When Sharpless 188 is up, how long it stays usable and when it is in season all depend on where you observe from. Set your site and this page adds tonight's answer and its year.

Set it on Tonight

The science

What you are looking at

In one sentence

The ionised gas shell an evolved, sun-like star sheds as it dies, lit by the exposed hot core left behind.

Class explainer for planetary nebula (SIMBAD classification).

The facts

Sharpless 188 is a planetary nebula in Cassiopeia, catalogued as LBN 633. SIMBAD gives its distance as 943.485 pc (−65.3381 pc / +65.3381 pc) — ≈ 3,077.23 ly, measured by parallax from 3 measurements. The light reaching us from it now left it around 1052 BCE. On the sky it spans 9.0′ — 29% of the full Moon's width. At that distance, that angle means it is roughly 8 light-years across.

Sources: AstroBrain catalogue; Sharpless S. 1959, ApJS 4, 257, via CDS/VizieR VII/20; Lynds B.T. 1965, ApJS 12, 163, via CDS/VizieR VII/9; CDS/SIMBAD astronomical database, Strasbourg (SIMBAD record SH 2-188 · distance from 2020yCat.1350....0G). Contains information from SIMBAD, which is made available here under the Open Database License (ODbL). Download the SIMBAD-derived data.

For scale

Angular size, as it would sit on your sky.

8 ly

across — 2× the distance from the Sun to its nearest neighbour star (4.37 ly).

The same patch of sky in visible light

Sky image
Observatory photos and open-licence sky surveys.
Credits on each image.

Neighbours in the sky

Sky maths: apparent positions with refraction, one-minute steps; usable = full astronomical dark, at least 30° up and clear of your skyline. Survey images: CDS, Strasbourg (DSS2 and other surveys). Science: SIMBAD. The hours, heights and Moon on this page use no weather forecast; the rank is this target’s place in the Targets list, whose score also counts the cloud forecast when there is one.

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