comet
Let an agent handle comets by designation, orbit, activity and visibility, and separate them from asteroids and meteors.
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 handle comets by designation, orbit, activity and visibility, and separate them from asteroids and meteors.
A small icy body orbiting the Sun that develops a glowing coma and often tails of gas and dust when close enough to the Sun for its ices to sublimate.
What it is for: Comets preserve material from the early Solar System and are spectacular sky objects.
It can be discover and designate it; observe it, and predict its visibility; track its orbit; visit it, with spacecraft.
Distinguishing features
Icy nucleus that becomes active near the Sun
Coma and tails, unlike asteroids
Periodic and non-periodic orbits
Meteor showers come from comet debris
What it looks like
A fuzzy head (coma) with one or more tails pointing away from the Sun; bright comets are visible to the naked eye.
Physical character
nucleus diameter: 0.1-60 km
tail length: up to over 1 AU distance
How it is recognised
Fuzzy coma and tails
Designations such as 1P/Halley or C/2020 F3
Meteors are brief streaks, not comets
Related models
is a kind of - small body
is confused with - no coma
produces - debris
orbits - the Sun
In practice
Families and kinds
short-period (P/) and long-period comets (C/)
sungrazing comets
extinct and lost comets
great comets
Identifiers
comet designation P/ or C/ plus year and letters, or number P/ IAU Minor Planet Center
Standards and regulation
IAU comet naming rules
Failure modes and hazards
Brightness predictions often wrong
Confusing designations
Sensational doom claims
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.comet
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identity Which comet.
Designations identify comets precisely.
Designation
MPC designation.
Designation
The designation and name.
- What is its designation and name? provenance
- Is it periodic? definition
Discovery
Who and when.
Discovery
Discovery details.
- When and by whom was it discovered? provenance
- Is it a returning comet? definition
Orbit Path and return.
Orbit decides visibility and return.
Elements
Orbital elements.
Orbit
Orbital data.
- What are its perihelion date and distance? measurement
- When will it return, if at all? measurement
Close approach
To Earth.
Approach
Closest approach.
- How close does it come to Earth? measurement
- Is there any risk? boundary
Activity Coma and tails.
Activity changes brightness.
Brightness
Magnitude.
Brightness
Predicted and observed brightness.
- How bright is it expected to be, and how reliable is that? measurement
- Is it brightening or fading? measurement
Composition
Ices and dust.
Composition
Composition.
- What is its composition? measurement
- How was that measured? provenance
Observation Seeing it.
People want to know when and where to look.
Where to look
Sky position.
Visibility
Where and when visible.
- Where and when is it visible from a given place? action
- Is equipment needed? definition
Myths
Doom claims.
Myths
Myths to correct.
- Are there false claims about this comet? boundary
- How should they be corrected? action
What the second pass must settle
- Should comets be instances with MPC designations?
- How should brightness uncertainty be communicated?
- How should comet and meteor shower links be modelled?