Este diagrama ilustra la potencia combinada de los telescopios espaciales Hubble y Webb para clavar distancias precisas a una clase especial de estrella variable que se usa para calibrar la tasa de expansión del universo. Estas estrellas variables cepheides se ven en los campos de estrellas abarrotados. La contaminación ligera de las estrellas circundantes puede hacer que la medición del brillo de un cefeido sea menos preciso. La visión infrarroja más nítida de Webb permite que un objetivo cepheid esté más claramente aislado de las estrellas circundantes, como se ve en el lado derecho del diagrama. Los datos de Webb confirman la precisión de 30 años de observaciones de Hubble de cefeidas que fueron críticos para establecer el peldaño inferior de la escala de distancia cósmica para medir la tasa de expansión del universo. At the left, NGC 5584 is seen in a composite image from Webb’s NIRCam (Near-Infrared Camera) and Hubble’s Wide Field Camera 3.
Credits
científicos
nasa, csa, ca, acreditados. Riess (jhu, stsci)
ilustración
joyce kang (stsci)
| About The Object | |
|---|---|
| Object Name | NGC 5584 |
| Object Description | Spiral galaxy, cepheid host galaxy |
| R.A. Position | 14:22:23.76 |
| Dec. Position | 00:23:15.61 |
| Constellation | Virgo |
| Distance | About 72 million light-years (22 million parsecs) |
| 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. |
