Eris took its day from the SBDB's rot_per, 25.9 hours, whose own note reads "Result based on less
than full coverage, so that the period may be wrong by 30 percent or so" (Roe et al. 2008). Eris
is locked to Dysnomia: its light curve repeats every 15.771 +/- 0.008 days (Bernstein et al. 2023,
PSJ 4, 115), Dysnomia's 15.78590-day orbit (Holler et al. 2021; Szakáts et al. 2023, A&A 669, L3).
It was drawn turning 14.6 times too fast.
Eris's BodySpec now carries that day, 378.504 hours, cited as its radius already cites Sicardy et
al., and a spec's measured day comes before its source's. build.ts checks that Eris's day is
Dysnomia's orbit within 0.2 per cent. In the running app Eris turns 5.707 degrees in six hours, as
15.771 days gives; on 25.9 hours it turned 83.4.
Makemake's SBDB period, 22.83 hours, carries the same flag; it is Hromakina et al. 2019's own
result and nothing later overturns it, so it is kept.
Control: Eris on the SBDB's period fails the ETL: "Eris turns once in 1.079 days".
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
SenrokaiandClaude Opus 5.5
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