En el centro de estas imágenes de lado a lado hay una clase especial de estrella utilizada como un marcador milepostero para medir la tasa de expansión del universo: una estrella variable cepheid. Las dos imágenes están muy pixeladas porque son una vista muy ampliada de una galaxia distante. Cada uno de los píxeles representa una o más estrellas. La imagen del telescopio espacial James Webb es significativamente más agudo en longitudes de onda de infrarrojo cercano que Hubble (que es principalmente un telescopio de luz ultravioleta visible). Al reducir el desorden con la visión más nítida de Webb, el Cepheid se destaca más claramente, eliminando cualquier posible confusión. Webb se utilizó para observar una muestra de cefeidos y confirmó la precisión de las observaciones de Hubble anteriores que son fundamentales para medir con precisión la tasa de expansión y la edad del universo.
créditos
Image
nasa, Esa, CSA, Stsci, Adam G. Riess (Jhu, ST)
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| About The Object | |
|---|---|
| Object Name | Cephied P42 |
| Object Description | Cephied in NGC 5468 |
| R.A. Position | 14:06:35.01 |
| Dec. Position | -05:27:15.72 |
| Constellation | Virgo |
| Distance | About 130 million light-years |
| About The Data | |
| Data Description | This image was created with Webb and Hubble data from proposals: 1685 and 11570 (A. Riess). Image processing: Alyssa Pagan (STScI). |
| Instrument | Hubble>WFC3/IR Webb>NIRCam |
| Exposure Dates | Hubble> 28 December 2017- 25 March 2018 Webb> 28 June 2023, 15 July 2023 |
| Filters | Hubble> F160W Webb> F150W |
| About The Image | |
| Color Info | The images are separate exposures acquired by the NIRCam instrument on the James Webb Space Telescope (left) and the WFC3/IR instrument on the Hubble Space Telescope (right). |
| About The Object | |
|---|---|
| Object Name | A name or catalog number that astronomers use to identify an astronomical object. |
| Object Description | The type of astronomical object. |
| R.A. Position | Right ascension – analogous to longitude – is one component of an object's position. |
| Dec. Position | Declination – analogous to latitude – is one component of an object's position. |
| Constellation | One of 88 recognized regions of the celestial sphere in which the object appears. |
| Distance | The physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs. |
| Dimensions | The physical size of the object or the apparent angle it subtends on the sky. |
| About The Data | |
| Data Description |
|
| Instrument | The science instrument used to produce the data. |
| Exposure Dates | The date(s) that the telescope made its observations and the total exposure time. |
| Filters | The camera filters that were used in the science observations. |
| About The Image | |
| Image Credit | The primary individuals and institutions responsible for the content. |
| Publication Date | The date and time the release content became public. |
| Color Info | A brief description of the methods used to convert telescope data into the color image being presented. |
| Orientation | The rotation of the image on the sky with respect to the north pole of the celestial sphere. |
