Pith Number

pith:UB5ELMCU

pith:1999:UB5ELMCUIEGFDAIJZ2FDVUP7JH

not attested not anchored not stored refs pending

From Pre-Stellar Cores to Protostars: The Initial Conditions of Star Formation

Cardiff), CEA Saclay), Derek Ward-Thompson (University of Wales, Mary Barsony (University of California at Riverside), Philippe Andre (Service d'Astrophysique

arxiv:astro-ph/9903284 v1 · 1999-03-18 · astro-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UB5ELMCUIEGFDAIJZ2FDVUP7JH}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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.

Cited by

4 papers in Pith

Early phases of star formation with SKAO: synchrotron emission from dense starless cores in molecular clouds

TOI-7154b: A Close-in Massive Brown Dwarf in an Eccentric Orbit

Evidence of Enhanced Ionization in Protostellar Envelopes

Turbulent infall onto class 0 disks as cause of CAI brief condensation episode in the solar system

Receipt and verification

First computed	2026-07-04T14:16:37.361828Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a07a45b054410c518109ce8a3ad1ff49c1c41962ee208ea3f4be3fd0b7e0126c

Aliases

arxiv: astro-ph/9903284 · arxiv_version: astro-ph/9903284v1 · doi: 10.48550/arxiv.astro-ph/9903284 · pith_short_12: UB5ELMCUIEGF · pith_short_16: UB5ELMCUIEGFDAIJ · pith_short_8: UB5ELMCU

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/UB5ELMCUIEGFDAIJZ2FDVUP7JH \
  | 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: a07a45b054410c518109ce8a3ad1ff49c1c41962ee208ea3f4be3fd0b7e0126c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e981bb867021ee5e1fa8d35e685a44b9a4fbeb6fe06e042c44bca3316d9499a3",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-03-18T13:58:39Z",
    "title_canon_sha256": "451903d87d6b4787e8b2bbdc26d9d0aa1a9d07758c04ec36ca381fe412dfb1d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9903284",
    "kind": "arxiv",
    "version": 1
  }
}