Archive for the ‘comet’ tag
Guest post by Dr. Constance E. Walker, director of GLOBE at Night
What would it be like without stars at night? What is it we lose?
Starry night skies have given us poetry, art, music and the wonder to explore. A bright night sky (aka “light pollution”) affects energy consumption, health and wildlife too.
Spend a few minutes to help scientists by measuring the brightness of your night sky. Join the GLOBE at Night citizen-science campaign! The first campaign starts January 3 and runs through January 12.
GLOBE at Night is a worldwide, hands-on science and education program to encourage citizen-scientists worldwide to record the brightness of their night sky. During five select sets of dates in 2013, children and adults match the appearance of a constellation (Orion or Leo in the northern hemisphere, and Orion and Crux in the southern hemisphere) with seven star charts of progressively fainter stars. Participants then submit their choice of star chart with their date, time and location. This can be done by computer (after the measurement) or by smart phone or pad (during the measurement). From these data an interactive map of all worldwide observations is created.
Over the past 7 years of 10-day campaigns, people in 115 countries have contributed over 83,000 measurements, making GLOBE at Night the most successful, light pollution citizen-science campaign to date. The GLOBE at Night website is easy to use, comprehensive, and holds an abundance of background information. Guides, activities, one-page flyers and postcards advertising the campaign are available. Through GLOBE at Night, students, teachers, parents and community members are amassing a data set from which they can explore the nature of light pollution locally and across the globe.
There are 5 GLOBE at Night campaigns in 2013:
January 3 – 12
January 31 – February 9
March 3 – 12
March 31 – April 9
April 29 – May 8
Make a difference and join the GLOBE at Night campaign.
In December 2010, as people on Earth celebrated the holidays and prepared to ring in the New Year, a European Space Agency (ESA)/NASA spacecraft quietly reached its own milestone: on December 26, the Solar and Heliospheric Observatory (SOHO) discovered its 2000th comet.
Drawing on help from citizen scientists around the world, SOHO has become the single greatest comet finder of all time. This is all the more impressive since SOHO was not designed to find comets, but to monitor the Sun.
“Since it launched on December 2, 1995, to observe the Sun, SOHO has more than doubled the number of comets for which orbits have been determined over the last three hundred years,” says Joe Gurman, the U.S. project scientist for SOHO at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
Of course, it is not SOHO itself that discovers the comets — that is the province of the dozens of amateur astronomer volunteers who daily pore over the images produced by SOHO’s LASCO (or Large Angle and Spectrometric Coronagraph) cameras. More than 70 people representing 18 different countries have helped spot comets over the last 15 years by searching through the publicly available SOHO/LASCO images online. The 1999th and 2000th comets were both discovered by an astronomy student at the Jagiellonian University in Krakow, Poland.
“There’s an ever-growing community of amateur astronomers who contribute to this project,” says Karl Battams, who has been in charge of running the SOHO comet-sighting web site since 2003 for the Naval Research Laboratory, where he does software development, data processing, and visualization work for NRL’s solar physics missions. “These volunteers are absolutely fundamental to the success of this program. Without them, most of this tremendously valuable astronomical data would never see the light of day.”