Morphology Classes

Class indices follow the Galaxy10 convention (0–9) used by every module of src/astrovision.

Counts and photometry

Class	Images	With SDSS	Median g−r	Blue cloud	Red sequence
0 · Disturbed	1,081	1,076	0.585	61%	26%
1 · Merging	1,853	1,835	0.891	28%	58%
2 · Round Smooth	2,645	2,635	0.906	23%	63%
3 · In-between Round Smooth	2,027	2,026	0.867	26%	58%
4 · Cigar Shaped Smooth	334	332	0.765	43%	33%
5 · Barred Spiral	2,043	2,039	0.756	48%	20%
6 · Unbarred Tight Spiral	1,829	1,821	0.679	65%	14%
7 · Unbarred Loose Spiral	2,628	2,617	0.640	71%	12%
8 · Edge-on without Bulge	1,423	1,414	0.670	58%	17%
9 · Edge-on with Bulge	1,873	1,870	0.970	3%	85%

Source: data/synthesis_summary_table.csv. Blue cloud / red sequence fractions are shares of each class; green valley makes up the remainder (definition: SDSS Cross-match page).

Colour separates the classes strongly: Edge-on with Bulge has a median g−r of 0.970 and 85% of its galaxies on the red sequence, while Unbarred Loose Spiral has 71% on the blue cloud. Merging and disturbed systems differ sharply from each other: 61% of Disturbed galaxies are blue, against 28% of Merging ones.

Recall by class

Class	SimpleCNN	EfficientNet-B0	DINOv2 fine-tuned	Fusion
0 · Disturbed	0.11	0.44	0.53	0.59
1 · Merging	0.55	0.89	0.86	0.90
2 · Round Smooth	0.90	0.90	0.94	0.95
3 · In-between Round Smooth	0.85	0.95	0.95	0.91
4 · Cigar Shaped Smooth	0.12	0.83	0.72	0.86
5 · Barred Spiral	0.68	0.84	0.87	0.91
6 · Unbarred Tight Spiral	0.63	0.78	0.83	0.83
7 · Unbarred Loose Spiral	0.61	0.76	0.78	0.79
8 · Edge-on without Bulge	0.75	0.96	0.96	0.93
9 · Edge-on with Bulge	0.76	0.92	0.93	0.97

Test-set recall. SimpleCNN and EfficientNet: notebook 02; DINOv2: read from the exported confusion matrix; fusion: notebook 08 (different test split, 2,661 images).

Provenance. Model scores in this section are copied from the output cells of the AstroVision notebooks (and, for DINOv2 per-class recall, read from an exported figure). The documentation data pack contains no metrics file for them, so they cannot be re-derived from the pack; the cell of origin is listed for each value in _facts/astrovision/FACTS_INDEX.md §3 and shown when hovering over a number.

Disturbed is the hardest class for every model, and Cigar Shaped Smooth (the smallest) is the most sensitive to the model family: a recall of 0.12 for SimpleCNN against 0.83 for EfficientNet-B0.