This picture shows a comparison of the unprocessed Wide Field/ Planetary Camera (WF/PC) image (A) with images produced by three different image restoration techniques (B, C, D). As discussed in the accompanying background information on image processing, all of these techniques attempt to remove the halos which can be seen around stars in the raw image. The techniques used were: B) Jansson's constrained iterative method (from the Space Telescope Science Institute), C) a constrained least squares/maximum entropy method (from the Goddard High Resolution Spectrograph team), and D) Lucy's iterative method (from the WF/PC team.)
In general, these three very different methods give remarkably similar results. Some of the techniques generate slightly sharper images. Also, the cosmic ray (CR) hits have been removed from image D (note, for example, the linear CR feature in the middle right of A, B, and C.) Except for these minor differences, the excellent agreement of these three methods give us confidence that the restored images from all three methods are quite reliable.
Credits
NASA, ESA, and STScI| About The Object | |
|---|---|
| Object Name | 30 Doradus, R136 |
| R.A. Position | 05h 38m 42.39s |
| Dec. Position | -69° 6' 2.81" |
| 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. |
