This is more likely to happen when the asterism does not consist of bright stars.
From the en.wikipedia.org
Star sapphires and rubies get their asterism from rutile impurities present in them.
From the en.wikipedia.org
In Finnish language, the asterism is sometimes called with its old Finnish name, Otava.
From the en.wikipedia.org
Another asterism, the Circlet, lies S of the Square and marks one of the two fish of Pisces.
From the guardian.co.uk
Thus, an asterism is able to be located if its neighbours are robust.
From the en.wikipedia.org
The most prominent feature of Crux is the distinctive asterism known as the Southern Cross.
From the en.wikipedia.org
Small rutile needles present in gems are responsible for an optical phenomenon known as asterism.
From the en.wikipedia.org
The name was also derived from the city's establishment on the auspicious asterism called Anura.
From the en.wikipedia.org
Some types of quartz contain microscopic rutile needles which produces an asterism in transmitted light.
From the en.wikipedia.org
More examples
(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light
(astronomy) a cluster of stars (or a small constellation)
(asterismal) relating to asterisms or constellations
In astronomy, an asterism is a pattern of stars seen in Earth's sky which is not an official constellation. ...
In gemmology, an asterism is an optical phenomenon displayed by some rubies, sapphires, and other gems (i.e. star garnet, star diopside, star spinel, etc.) of an enhanced reflective area in the shape of a "star" on the surface of a cabochon cut from the stone. ...
In typography, an asterism is a rarely used symbol consisting of three asterisks placed in a triangle . It is used to call attention to a passage or to separate subchapters in a book. It is Unicode character .
The star effect that you see in star sapphires or rubies, for example. This is usually caused by tiny silk rutile inclusions in the stone. The effect can be four- or six- rayed.
A group of stars that appear to make a recognizable shape, such as the Big Dipper.
Pattern of apparently neighbored, but physically unrelated stars, formed by a chance alignment of stars at different distances which happen to be situated in about the same direction.