Posts Tagged ‘STEREO’

The first images of the comet Elenin from STEREO-B


A few hours ago, the first images of the comet, obtained with the camera HI2-B of spacecraft STEREO-B, was available. Animation is created from the so-called beacon frames, which used for checking the accuracy of pointing and exposures settings . Original, full size frames will be downloaded to the Earth on August 4. At this time, the comet will appear on the images from HI-1B camera, which has higher resolution. The study of comets on the unique images taken with the STEREO spacecraft has just begun!

5 hours to closest approach

Closest approach of the comet Elenin and the spacecraft STEREO-B will be exactly in 5 hours, on 12:40 UT. Objects will be pass at a distance of 7,400,196 km of each other. Observations of the comet will begin in less than a day.

The test roll was succesful, let’s wait for August 1


Karl Battams, one of the STEREO team members confirmed the successful test roll of the spacecraft to 135 degrees. Carl noted that the angle of roll is chosen very well. From 1 to August 5, the comet will be visible in the instrument HI-2B, then observations will be continue with HI-1B camera. The first data will be transmitted to Earth on August 2-3 and will be available from August 4.

The comet may be a very bright and one of the main objectives of the observations will be study the effect of forward scattering. This effect can increase the brightness of comet by several magnitudes and we will see this effect from SOHO spacecraft, in late September.

Observation’s shedule you can find here.

STEREO-B test roll

Less than an hour, the spacecraft STEREO-B will start a scheduled, test of 135 degree roll. The maneuver takes place from 12-14 UT.

“Jul 31 – Aug 12 Behind: Spacecraft rolls to observe comet Elenin”

The SECCHI team requests to roll the Behind spacecraft by 135 degrees for two hours per day each day between Aug 1 (or late on Sep 31) and Aug 12 to observe comet Elenin as it flies within 0.05 AU of the spacecraft. Observations of the comet at a wide variety of phase angles will provide information about composition. There’s also a possibility that the in situ instruments on Behind will see the ion tail.

The requested two hours per day will include the roll and settle times, with the roll starting on an even hour boundary, and then back to nominal roll and settled on the next even hour boundary. A more detailed plan will be sent to APL (Applied Physics Laboratory of Johns Hopkins University).

The test of the roll maneuver to observe Comet Elenin from Behind is expected to be scheduled sometime in week 29 (July 18-24).


August 2022
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