The HEASARC welcomes your participation in a brief survey to capture how users access and utilize HEASARC data, software, and services. The outcome(s) of this survey will be used to guide, prioritize, and plan our activities and development in the coming years. It contains 18 questions, generally takes just a few minutes to complete, and your answers will remain totally anonymous. We thank you in advance for your valuable feedback.

ROSAT Guest Observer Facility

First X-Rays from a Comet Discovered

ROSAT image of comet Hyakutake

GIF format with Comment Extension Block.

An X-ray image of Comet Hyakutake, as observed by the High Resolution Imager on the ROSAT X-ray observatory. The X-rays arise primarily from a crescent-shaped region with a diameter of about 50,000 km, on the sunlit side of the comet. The directions toward the sun and of the comet motion are indicated by the arrows. No X-ray emission is detected from the nucleus, marked by the "+" sign. The ellipse represents the instrument field of view, not the extent of the X-ray emission.

door Return to the HEASARC Home Page.

NASA Logo Go to the NASA Home page.