Estado actual

Los primeros datos de Gaia

Los primeros datos de Gaia, que se presentarán de forma online el 14 de septiembre, incluirán las posiciones y la magnitud G de unos mil millones de estrellas, calculados a partir de las observaciones realizadas entre el 25 de julio y el 16 de septiembre de 2015.

Además, se publicará una solución astrométrica de cinco parámetros, que proporcionará las posiciones, los paralajes y los movimientos propios de un determinado subconjunto de datos, correspondientes a unos dos millones de estrellas incluidas tanto en el catálogo Tycho-2 como en el de Gaia. Es lo que se conoce como la Solución Astrométrica Tycho-Gaia (TGAS).

También se publicarán los datos fotométricos de las estrellas variables RR Lyrae y Cefeidas, observadas frecuentemente durante un modo de barrido específico que pasaba repetidamente por los polos eclípticos.

 

Video del escaneado del cielo durante el comisionado

El video del escaneado del cielo nos muestra las áreas del cielo que Gaia ha observado durante aproximadamente cinco meses de comisionado.

Los ejes de la imagen son las coordenadas ecuatoriales (declinación y ascensión recta), mientras que la escala de colores indica la densidad de medidas (observaciones por grado cuadrados). Tal densidad depende tanto del cielo en sí mismo como en la “ley de escaneado” de Gaia.

Como se puede observar, hay zonas donde la densidad es significativamente más alta que otras. Esto se debe a las leyes especiales de escaneado en las que Gaia ha estado en funcionamiento durante los meses de comisionado. En concreto, hay dos pequeñas áreas con una densidad muy alta: los “polos eclípticos”, es decir, los puntos de la esfera celeste atravesados por una línea imaginaria perpendicular al plano de la eclíptica -descrito por el desplazamiento de la Tierra en su órbita alrededor del Sol.

Esta característica es intencionada: la fase de comisionado se diseñó con una ley de escaneado de los polos eclípticos (“Ecliptic Poles Scanning Law”, EPSL), en la que el eje de rotación de Gaia es totalmente fijo con respecto al eje entre Gaia y el Sol (sin movimiento de precesión). De este modo se han observado los polos eclípticos cada día, permitiendo a los científicos del consorcio DPAC utilizar las estrellas en estos polos como referencia y así poder realizar diagnósticos esenciales sobre el satélite, sus instrumentos y los sistemas de procesamiento de datos en tierra. Este modo EPSL puede ser “posterior” o “anterior”, es decir, con el eje de giro de Gaia a -45 o a +45 grados con respecto al eje Gaia-Sol en el plano de la eclíptica.

También se han probado diferentes maniobras y modos de escaneado del satélite durante estos meses. Por ejemplo, estableciendo el angulo del eje de giro a cero grados con respecto al eje Gaia-Sol (“Sun Aspect Angle”, SSA). También, y sobretodo, la ley de escaneado nominal (“Nominal Scanning Law”, NSL) que es el modo en el que Gaia opera durante la misión nominal . Este modo NSL se probó dos veces durante el comisionado, incluyendo el escaneado del plano galáctico, en el que el número de observaciones es muy alto, lo que sirve como test de esfuerzo para todos los sistemas.

El video ilustra muy bien todas estas maniobras. Empieza con el modo de EPSL posterior, seguido por el modo de EPSL anterior (incluyendo un corto periodo con un ángulo SAA de de cero grados). Unos días más tarde se probó el modo NSL, a continuación, volviendo a EPSL anterior, y por último el escaneo NSL cerca del plano galáctico.
Estos números del escaneado del cielo se determinan automáticamente por el tratamiento de datos inicial (“Initial Data Treatment”, IDT) a partir de los datos procesados diariamente, utilizando las mediciones de estrellas y la información de actitud del satélite. La imagen compuesta y el video han sido preparados por el equipo de la UB.

El mismo video con la anotación de la ley de escaneado.

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