Place a naked-eye star by SIMBAD's name only within a magnitude of its source, and hold HD 45951 to it

e7c420b placed two naked-eye HYG rows along the Gaia source SIMBAD names them as. One of them,
θ¹ Ori A (HD 37020, HYG 26155), came with HYG's V 4.98 and O7, which are Hipparcos's for it and a
companion together: SIMBAD has θ¹ Ori A at V 6.73 and B0V, and its source at G 6.63. At 378 pc the
map drew it at 2.7e4 L and 37 100 K, brighter than θ¹ Ori C beside it, and counted it naked-eye.
The lookup by position already refuses a source more than a magnitude off HYG's V (it refused
this one); the lookup by name now does too. At its own magnitude and 378 pc the map does not keep
the star, as it keeps none that faint past 250 pc: 455 519 -> 455 518 stars, naked-eye 8 899 ->
8 898, of them past 250 pc 1 664 -> 1 663. HD 45951 (V 6.20 against G 5.90) is placed as before.

Nothing checked where HD 45951 was placed, only that its name was there. Along HYG's direction,
31.7' out, every check passed with the star drawn twice: under its name, and as its bare Gaia
designation. validateStars now requires the star named HD 45951 to carry that source's
designation, and requires HYG 26155 to be absent. The MIN_NAKED_EYE_STARS comment gives the new
counts and says why θ¹ Ori A is left out.

ETL mutants, each in a throwaway worktree with a copy of the cache, reached validation and failed
with the expected message:
- HD 45951 placed along HYG's x/y/z: "HD 45951 is not on Gaia DR3 3369454521490604416, the source
  SIMBAD names it as"
- the magnitude check dropped from the lookup by name: "θ¹ Ori A is drawn in the V and type of
  Hipparcos's blend of it with a companion."

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tools/etl/fetchStars.ts

@@ -113,8 +113,12 @@ export async function fetchStars(): Promise<StarRecord[]> {
     const crossMatched = row['hip'] ? gaiaByHip.get(Number(row['hip'])) : undefined;
     const positional = crossMatched === undefined && unplaced ? brightCounterpart(row, magnitude, brightGaia) : undefined;
     // Where HYG's position leads to no bright source, the one SIMBAD names it as: HD 45951, whose
-    // declination HYG has 31.7′ out, and θ¹ Ori A (HD 37020), whose V it has 1.65 brighter than G.
-    const byIdentity = crossMatched === undefined && positional === undefined && unplaced ? brightByDesignation.get(nakedEyeDesignations.get(`HD ${row['hd']}`) ?? '') : undefined;
+    // declination HYG has 31.7′ out. Within a magnitude of HYG's V, as by position: θ¹ Ori A
+    // (HD 37020) has V 4.98 and O7 in HYG, Hipparcos's entry for it and a companion together, and
+    // its own source G 6.63 (SIMBAD: V 6.73, B0V). Placed, it was drawn brighter than θ¹ Ori C and
+    // counted as naked-eye; at 378 pc and its own magnitude the map does not keep it.
+    const named = crossMatched === undefined && positional === undefined && unplaced ? brightByDesignation.get(nakedEyeDesignations.get(`HD ${row['hd']}`) ?? '') : undefined;
+    const byIdentity = named && Math.abs(named.magnitudeG - magnitude) <= BRIGHT_COUNTERPART_MAGNITUDES ? named : undefined;
     const gaia = crossMatched ?? positional ?? byIdentity;
     const gaiaPc = gaia?.distancePc;
     const hipparcosError = hipparcos?.relativeError;