asterism
Let an agent identify asterisms by stars, host constellation, visibility and cultural names, and separate them from constellations and physical double stars.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent identify asterisms by stars, host constellation, visibility and cultural names, and separate them from constellations and physical double stars.
A recognisable pattern of stars that is not one of the 88 official constellations, such as the Big Dipper or the Summer Triangle; the registry also groups optical double stars under this concept.
What it is for: Finding one way around the night sky and preserving sky lore.
It can be find it in the sky; use it to locate other objects; learn cultural names; photograph it.
Distinguishing features
Informal star pattern
Not an IAU constellation
Stars often at very different distances
Names vary by culture
What it looks like
A simple pattern of bright stars such as a dipper, triangle or cross.
How it is recognised
Pattern shape
Host constellation
Optical doubles look close but are not bound
Related models
is a kind of - category
is part of - host
is made of - members
is confused with - physical pair
In practice
Families and kinds
asterisms within constellations
asterisms spanning constellations
optical double stars
telescopic asterisms
Standards and regulation
IAU star names catalogue
Failure modes and hazards
Confusing asterisms with constellations
Treating optical doubles as physical pairs
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.asterism
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Pattern Which asterism.
Stars define the pattern.
Stars
Members.
Stars
Member stars.
- Which stars form the asterism? definition
- In which constellation? definition
Names
Cultural names.
Names
Names.
- What is it called in different cultures? provenance
- What stories are attached? provenance
Observing Finding it.
Visibility depends on place and time.
Visibility
When and where.
Visibility
Visibility.
- When and from where is it visible? measurement
- Is it circumpolar here? boundary
Star-hopping
Pointers.
Star-hopping
Star-hopping.
- Which objects can it help locate? action
- How? action
Physics Real distances.
Patterns are line-of-sight.
Distances
Depth.
Distances
Distances.
- How far away is each star? measurement
- From which catalogue? provenance
Doubles
Optical or bound.
Doubles
Optical doubles.
- Is this pair optical or a physical binary? boundary
- What evidence shows it? provenance
Sky Dark skies.
Light pollution hides stars.
Light pollution
Sky quality.
Light pollution
Sky quality.
- How bright is the sky here? measurement
- Where are darker sites? action
Change
Proper motion.
Change
Change over time.
- How will the pattern change over millennia? definition
- Due to which motions? definition
What the second pass must settle
- Should optical doubles be a separate entry?
- How should cultural asterisms be recorded?
- How should visibility be computed per location?