Pith Number

pith:DQUBPFHV

pith:2009:DQUBPFHVAYE2M37IVKLE6OSWZL

not attested not anchored not stored refs pending

Planetary Nebulae in Face-On Spiral Galaxies. II. Planetary Nebula Spectroscopy

Kimberly A. Herrmann, Robin Ciardullo (Penn State University)

arxiv:0908.0531 v1 · 2009-08-04 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DQUBPFHVAYE2M37IVKLE6OSWZL}

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.

Receipt and verification

First computed	2026-05-18T02:12:44.697392Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1c281794f50609a66fe8aa964f3a56caf422da363a3bbc45bb2a693e3b5194d8

Aliases

arxiv: 0908.0531 · arxiv_version: 0908.0531v1 · doi: 10.48550/arxiv.0908.0531 · pith_short_12: DQUBPFHVAYE2 · pith_short_16: DQUBPFHVAYE2M37I · pith_short_8: DQUBPFHV

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/DQUBPFHVAYE2M37IVKLE6OSWZL \
  | 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: 1c281794f50609a66fe8aa964f3a56caf422da363a3bbc45bb2a693e3b5194d8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "78bd388235098cbfca9dbfaf3b858944724513f9d1b149291f5a368d10c610fd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-08-04T20:01:28Z",
    "title_canon_sha256": "f1f43051bfab48f2a8d9800e6d0c31745ab3901dd18084955d506ff77029f786"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.0531",
    "kind": "arxiv",
    "version": 1
  }
}