Sky___Telescope_2020-02__UserUpload.Net
skyandtelescope.com • FEBRUARY 2020 19 Besides analyzing a micrometeorite’s appearance, I also identify space dust by its elemen ...
pHUBBLE’S VARIABLE NEBULA Edwin would be proud of this image of his namesake nebula taken with the orbiting observatory that als ...
HST IMAGE: NASA / ESA / THE HUBBLE HERITAGE TEAM / AURA / STSCI; HALE IMAGE: COURTESY OF THE ARCHIVES, CALIFORNIA INSTITUTE OF T ...
Shifting Shadows 22 FEBRUARY 2020 • SKY & TELESCOPE them. Photographically it is well defi ned and has almost the form of an ...
skyandtelescope.com• FEBRUARY 2020 23 scope. As it turned out, I could. There are also two observa- tions from October 2019 usin ...
Shifting Shadows 24 FEBRUARY 2020 • SKY & TELESCOPE tions with my 28-inch revealed obvious changes in the nebula and R Mon o ...
skyandtelescope.com • FEBRUARY 2020 25 the shadows cast by these streamers as they spiral through the cone pointed toward us tha ...
ALL IMAGES PROVIDED BY THE AUTHOR SHORT SHOTS: ONE AND DONE by Babak A. Tafreshi pPhotographing deep-sky targets over terrestria ...
qHigh-quality, fast lenses such as Sigma’s Art lens series combined with the lat- est sensors will produce your best results. sk ...
Short Shots: One and Done 28 FEBRUARY 2020 • SKY & TELESCOPE of your foreground when the camera is tracking the sky.) For ex ...
skyandtelescope.com • FEBRUARY 2020 29 qThis group of ALMA radio telescopes below the Coal Sack and Southern Cross was taken by ...
Short Shots: One and Done 30 FEBRUARY 2020 • SKY & TELESCOPE This focus-ramping technique is tricky to perform, par- ticular ...
skyandtelescope.com • FEBRUARY 2020 31 card or a piece of white paper in daylight with your intended fi lter in place. Make sure ...
ASTRONOMER’S WORKBENCH by Jerry Oltion Two Simple Spectrographs Homebrew science for a sunny day JUST ABOUT EVERYTHING we know a ...
pThe glint of sunlight off a polished rod is squeezed down to a line. Just as with a tradi- tional slit, that line is only as lo ...
SEEING DOUBLEby Jeff Hecht 34 FEBRUARY 2020 • SKY & TELESCOPE Binary Worlds PRIMITIVE WORLDThe Kuiper Belt object 2014 MU 69 ...
ARROKOTH: NASA / JHU APL / SWRI / NOAO; INFOGRAPHIC: TERRI DUBÉ / S&T , SOURCE: JOHNSTONSARCHIVE.NET; PLANETS: MARINAT197 / ...
Seeing Double 36 FEBRUARY 2020 • SKY & TELESCOPE The fi rst convincing evidence of a pair of asteroids orbiting each other, ...
skyandtelescope.com• FEBRUARY 2020 37 Boulder). Over long periods, the YORP effect can spin up a rubble-pile asteroid enough for ...
Seeing Double 38 FEBRUARY 2020 • SKY & TELESCOPE Collisions are known to happen in the main belt, a region of space that is ...
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