A retained red alternative is not the supported-visit counterpart

12 October 2026. This additive note displays an already-computed secondary record in the registered all-alternative colour table. It changes no source selection, cut, primary count or model and is not another research experiment. The independent raw-response verifier already checked this record and its colours.

Within the HIGALBM353.4272-0.3734 field, the known Catalog source SSTGLMC G353.4284-00.3731 has central [3.6]-[4.5] = 1.000 mag and [4.5]-[5.8] = 0.790 mag, both above the named >0.7 necessary cuts. It has four valid bands with quoted magnitude errors <0.2 and a zero 4.5-micron quality flag. Other-band native quality flags were not retained by the excerpt; zero in one band does not establish all-band reliability or physical class.

The first colour’s 3x quoted-error envelope is [0.772, 1.228], but the second’s is [0.529, 1.051]. Therefore it does not meet the registered robust necessary-colour criterion. These are sensitivity envelopes, not confidence bounds. The full standard Class-I/II classifier was not implemented or applied. Extinction, contaminants, blending, physical stage and clump membership remain unestablished. Central red colour is a reason to inspect, not a confirmed YSO.

The source lies 4.490 arcsec from the clump centre and matches 0 of 6 supported query-visit medians inside the frozen 2-arcsecond rule. It is different from the best positional record, SSTGLMC G353.4273-00.3723, which matches 4/6. Do not attribute the visit photometry/variability to this red alternative or replace the registered best source after readout. A clump can have multiple projected sources; a red neighbour and a changing emitter are different claims.

All source IDs and alternatives remain retained. Its existing GLIMPSE entry is not a discovery, birth or fresh physical validation. The three fixed best records still have zero four-band availability and zero robust red-colour support; the full 19,328-ID denominator and old scores/gates remain unchanged. This note adds no model fit, observation acquisition, full classification or successor test.

artifacts/irac_colour_secondary_alternative_20261012.json binds the exact native counter, both colour envelopes and prior visit geometry to committed source revision 106e2f842a903469f7529c54272cbf033509ba43. research/summarize_irac_colour_alternative.py reproduces this display from those committed blobs while preserving the original primary and all historical results.