Pith Number

pith:ZCUKP2QK

pith:2026:ZCUKP2QKMGX7X5RGXIYILQTCYN

not attested not anchored not stored refs pending

Oort Cloud Ecology -- IV. Exchanging Asteroids

Erwan Hochart, Simon Portegies Zwart

Sub-virial fractal star clusters exchange asteroids more readily than virialised Plummer clusters, and both suppress Oort Cloud formation.

arxiv:2604.19413 v2 · 2026-04-21 · astro-ph.EP · astro-ph.GA · astro-ph.SR

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\usepackage{pith}
\pithnumber{ZCUKP2QKMGX7X5RGXIYILQTCYN}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The sub-virial fractal cluster exhibits richer dynamics, with asteroids and planets more frequently acquiring high eccentricities and inclinations, along with a larger fraction of captured and rogue objects. Additionally, this cluster configuration has its extreme trans-Neptunian object and Sednoid analogues occupy regions of phase-space in semi-major axis, eccentricity and inclination commonly frequented by captured asteroids.

C2weakest assumption

The chosen initial conditions (virial radius of 0.5 pc, 150 stars, exactly 500 asteroids per star, 1-8 planets for stars below 2 solar masses, and integration to exactly 30 Myr) are representative of real star-forming regions and sufficient to capture the dominant processes for Oort Cloud assembly and asteroid exchange.

C3one line summary

Sub-virial fractal star clusters produce more captured asteroids, rogue objects, and high-eccentricity/inclination bodies than virialised Plummer clusters, but Oort Cloud formation is suppressed in both.

Receipt and verification

First computed	2026-05-29T01:05:10.155628Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c8a8a7ea0a61affbf626ba3085c262c34ec275ecf22a6ecf4e598fb6b2d2df7b

Aliases

arxiv: 2604.19413 · arxiv_version: 2604.19413v2 · doi: 10.48550/arxiv.2604.19413 · pith_short_12: ZCUKP2QKMGX7 · pith_short_16: ZCUKP2QKMGX7X5RG · pith_short_8: ZCUKP2QK

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/ZCUKP2QKMGX7X5RGXIYILQTCYN \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c8a8a7ea0a61affbf626ba3085c262c34ec275ecf22a6ecf4e598fb6b2d2df7b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "607d9af2572fc1ffd1b78b47fee4033f4ad0acc3208651e36fef1cf8e81fc942",
    "cross_cats_sorted": [
      "astro-ph.GA",
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2026-04-21T12:45:16Z",
    "title_canon_sha256": "55fb40217645ef388b567a0a75f04e32ade389d7e1548d6a7cf42317d8869e8d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.19413",
    "kind": "arxiv",
    "version": 2
  }
}