Pith Number

pith:63KTIEVU

pith:2026:63KTIEVUJCQYBY67M5WPGOZHPJ

not attested not anchored not stored refs resolved

Missing pairs in open cluster catalogs

Caroline Soubiran, Mingfeng Qin, Qingshun Hu, Yangping Luo, Yu Dai, Yufei Cai, Yuting Li

By cross-matching two open cluster catalogs, seven previously missing binary cluster candidates are identified, with two showing signs of gravitational binding over long timescales.

arxiv:2604.15968 v2 · 2026-04-17 · astro-ph.GA · astro-ph.SR

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\usepackage{pith}
\pithnumber{63KTIEVUJCQYBY67M5WPGOZHPJ}

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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

We identified seven isolated binary cluster candidates, comprising two likely bound systems with stable orbits over 100 Myr; two pairs with a possible common origin but lacking RV confirmation; and three pairs with significant velocity discrepancies, suggesting they are unbound or in transitional states. We also identified six cluster group candidates.

C2weakest assumption

That a 50 pc 3D separation plus tangential velocity difference cut, followed by orbital integration, reliably distinguishes physically bound pairs from chance alignments or unbound systems when radial velocity data are incomplete or absent.

C3one line summary

Cross-matching two open cluster catalogs yields seven isolated binary candidates (two likely bound) and six group candidates after kinematic and dynamical checks.

References

28 extracted · 28 resolved · 0 Pith anchors

[1] Astropy Collaboration, Price-Whelan, A. M., Sip˝ocz, B. M., et al. 2018, AJ, 156, 123 Astropy Collaboration, Robitaille, T. P., Tollerud, E. J., et al. 2013, A&A, 558, A33 2018

[2] Bica, E., Pavani, D. B., Bonatto, C. J., & Lima, E. F. 2019, AJ, 157, 12 2019

[3] Cantat-Gaudin, T. & Anders, F. 2020, A&A, 633, A99 2020

[4] 2020, A&A, 640, A1 2020

[5] Cantat-Gaudin, T. & Casamiquela, L. 2024, New A Rev., 99, 101696 2024

Receipt and verification

First computed	2026-06-03T14:05:24.640193Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f6d53412b448a180e3df676cf33b277a4b7c0e95af7003328e2dde8e886736a8

Aliases

arxiv: 2604.15968 · arxiv_version: 2604.15968v2 · doi: 10.48550/arxiv.2604.15968 · pith_short_12: 63KTIEVUJCQY · pith_short_16: 63KTIEVUJCQYBY67 · pith_short_8: 63KTIEVU

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/63KTIEVUJCQYBY67M5WPGOZHPJ \
  | 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: f6d53412b448a180e3df676cf33b277a4b7c0e95af7003328e2dde8e886736a8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9df1e2330597d4d224258a0a61038af13fe22291c2872a70ff6c6ec841b86047",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-17T11:30:50Z",
    "title_canon_sha256": "9067a6281270936dfe82ae09f759c76439004e3d9a7224f1c9ab4aa8e4b9c179"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.15968",
    "kind": "arxiv",
    "version": 2
  }
}