ASIAIR Official GroupMeridian Flip inconsistency: ASIAIR starts AutoCenter but mount not updated?
Hi,I would like to report a Meridian Flip issue that appears to be related to a mismatch between ASIAIR internal state and the actual mount state (pier side).SetupMount: Sky-Watcher (EQMOD)Control: ASIAIRGuiding: enabled (PHD2)Plate solving: enabled (AutoCenter ON)Meridian Flip settings:Stop tracking: 5 minutes before meridianFlip after meridian: 5 minutes after meridianObserved behaviorDuring an imaging session:ASIAIR correctly:stopped guidingstopped trackingentered Meridian Flip waiting phaseAfter the configured delay, ASIAIR:started Meridian Flipinitiated AutoCenter (plate solving + corrective slews)However:the mount did not appear to be in the correct post-flip geometryplate solving succeeded, but reported an initial offset of ~2.7°subsequent AutoCenter attempts increased the error instead of reducing it (up to 3.1°)This suggests that:the correction vectors were computed assuming a different pier side than the actual oneCritical failureBecause the correction direction was wrong:each AutoCenter correction moved the mount farther from the targetthe system continued trying to converge but diverged insteadWhen I attempted a manual recovery (GoTo to force flip):the mount slewed further in the wrong directioneventually reached the tripod legs (mechanical limit)Even a “Go Home” did not restore correct behavior immediately.Full recovery required:manual reposition to homerestart of the systemfresh initializationSupporting observations from logsBefore flip:PHD2 reports one pier side (e.g. West)During flip:ASIAIR behaves as if flip has occurred (AutoCenter active)After full manual reset:PHD2 reports opposite pier side (e.g. East)This strongly suggests that:the physical pier side change did not occur when ASIAIR assumed it didbut ASIAIR proceeded with post-flip logic anywayExpected behaviorAfter Meridian Flip trigger:Mount performs GOTO and confirms pier side changeOnly after that:AutoCenter should startcorrection vectors should converge (error decreasing)Actual behaviorAutoCenter starts even if mount state is inconsistentcorrection divergesno safeguard stops the processleads to potentially unsafe slewsPotential improvement suggestionsPier side validation before AutoCenterverify mount pier side changed before applying correctionsConvergence checkif error increases after N corrections → abort AutoCenterSafety limitdetect large divergence (>2–3° increasing) and stop slewingOptional debug infoexpose pier side and mount state during flip in logs/UINotesPlate solving itself worked correctlyIssue seems related to state synchronization, not solving accuracyBehavior is reproducible in principle if mount state becomes inconsistent near meridianIf needed, I can provide:full Autorun logsPHD2 logstimestamps of the flip sequenceThanks for your work on ASIAIR—this is a critical workflow area and I hope this report helps improve robustness and safety.
Seestar Official GroupFour nights of clear skies were a brilliant intro to the 2026 spring!
Managed to make a huge amount of progress across the Messier and Caldwell catalogues. We got very lucky down in southwestern UK.
Deep Sky PhotographyIs this a comet trail on galaxy+nebula image?
I got this blue line above an image of the surfboard galaxy and the owl nebula, wondering if it was a comet. 1h 11min, 20 second exposures on SeeStar S30.
Astro EncyclopediaClasificación morfológica de galaxias (sistema de Clasificación de Hubble)
Propuesta por Edwin Hubble en 1926, conocida como el "Diagrama de la Taza de Café" o diagrama de Hubble, clasifica galaxias según su forma y estructura:🔹 Tipos principales1️⃣ Galaxias elípticas (E)Forma: ovaloide sin estructura definida.Subtipos: E0 a E7, según su elongaciónE0 → casi esféricaE7 → muy alargadaComposición: estrellas viejas, poco gas y polvo, casi sin formación estelar.2️⃣ Galaxias espirales (S)Forma: disco plano con núcleo central y brazos espirales.Subtipos según bulbo y brazos:Sa: bulbo grande, brazos apretadosSb: intermedioSc: bulbo pequeño, brazos abiertosMagnitud y tamaño: dependen de la orientación (cara o perfil).2a. Galaxias espirales barradas (SB)Como S, pero con una barra central de estrellas desde la que salen los brazos.Subtipos: SBa, SBb, SBc, igual que las normales.2b. Notación intermedia (SAB)Entre espiral normal y barrada: SABa, SABb, SABc.2c. Detalles adicionales(s) → brazos salen directamente del núcleo(r) → con anillo(rs) → intermedio3️⃣ Galaxias lenticulares (S0)Intermedio entre elípticas y espirales.Tienen disco pero sin brazos espirales claros.Pueden tener un bulbo prominente.4️⃣ Galaxias irregulares (Irr)Sin forma definida.Subtipos: Irr I (Algo de estructura, restos de núcleo o brazos) y Irr II (Sin estructura reconocible, completamente caótica).Suelen ser pequeñas y ricas en gas, con formación estelar activa.Ejemplo práctico:🔬 SA(s)ab explicado1. SAS = galaxia espiralA = sin barra central👉 Es decir: espiral no barrada(en contraste con “SB”, que sí tiene barra)2. (s)Indica la estructura interna(s) = los brazos espirales salen directamente del núcleo(sin anillo intermedio)👉 Alternativas:(r) = con anillo(rs) = intermedio3. abDescribe lo apretados que están los brazos y el tamaño del bulbo👉 Escala:a → brazos muy cerrados, bulbo grandeb → intermedioc → brazos abiertos, bulbo pequeño👉 Entonces ab = entre “a” y “b”(o sea, bastante estructurada pero no extrema)🧠 Resumen rápidoSA(s)ab =➡️ Galaxia espiral➡️ Sin barra➡️ Brazos salen directamente del núcleo➡️ Brazos moderadamente enrollados y bulbo notable
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