Pith Number

pith:4H6CYHVC

pith:2026:4H6CYHVCAMEBU6GVWXOTVIBLAF

not attested not anchored not stored refs pending

High-fidelity stellar extinction with Gaia and APOGEE -- I. The method and a new extinction curve

Dennis Stello, Giacomo Cordoni, Haibo Yuan, Hiep Nguyen, Ioana Ciuc\u{a}, Jie Yu, John A. Taylor, Luca Casagrande, Ronald Drimmel, Shourya Khanna, Tomasz R\'o\.za\'nski, Zhen Yuan

Stellar extinction for APOGEE stars is measured to 0.03 mag precision by training an XGBoost model on minimally reddened stars and anchoring to a Gaia BP/RP ratio of 1.694.

arxiv:2601.10595 v2 · 2026-01-15 · astro-ph.SR · astro-ph.GA

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\usepackage{pith}
\pithnumber{4H6CYHVCAMEBU6GVWXOTVIBLAF}

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Record completeness

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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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

Our extinction estimates (Av) outperform existing results (Bayestar19, StarHorse, SEDEX), achieving a typical precision of 0.03 mag in Av. Notably, we identify systematic deviations of up to 30% between monochromatic and passband-integrated extinction ratios at wavelengths greater than 700 nm.

C2weakest assumption

The assumption that a training set of minimally reddened stars exists and can be reliably identified to train the XGBoost model for intrinsic colors without residual dust bias.

C3one line summary

Machine learning derives 0.03 mag precision Av extinctions for APOGEE stars and a new passband-specific extinction curve showing up to 30% deviations from monochromatic ratios beyond 700 nm.

Receipt and verification

First computed	2026-05-17T23:39:16.651016Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e1fc2c1ea203081a78d5b5dd3aa02b01422da4d7ec1660055196171b34c7eb9f

Aliases

arxiv: 2601.10595 · arxiv_version: 2601.10595v2 · doi: 10.48550/arxiv.2601.10595 · pith_short_12: 4H6CYHVCAMEB · pith_short_16: 4H6CYHVCAMEBU6GV · pith_short_8: 4H6CYHVC

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/4H6CYHVCAMEBU6GVWXOTVIBLAF \
  | 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: e1fc2c1ea203081a78d5b5dd3aa02b01422da4d7ec1660055196171b34c7eb9f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a35c3faf44a6a8bf7c3cbb8c222da68fd9aa227bf733854bfff550c37bd2425a",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-01-15T17:03:08Z",
    "title_canon_sha256": "24d3fd2d03e8ef02a5ead19be85f1df8184648fa82ec1be62bb1dcf2bf14afe9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.10595",
    "kind": "arxiv",
    "version": 2
  }
}