Light pollution is most amateur astronomers' worst enemy. Learn here how to measure and describe how brightly your sky glows.
Late Monday night, October 6-7, 2008, a tiny asteroid will enter Earth's atmosphere over Sudan, creating a spectacular explosion in the night sky.
An unexpected meteor burst was detected on the night of September 8-9. Bill Cooke of the Marshall Space Flight Center is urging meteor watchers to see if the activity continues on the night of September 9-10.
Amateurs have helped lead the way in recording the flashes of meteoroids hitting the Moon's night side.
Jupiter's newest red spot was disrupted during its encounter with the Great Red Spot and Oval BA, but appears to be reforming.
During May and June 2008, this visitor may be dimly visible without a telescope — but only if you live in the Southern Hemisphere.
Just magnitude 9 when discovered on April 18, 2008, this nova in Sagittarius has brightened tenfold.
Two Japanese amateurs captured the new star on April 10, 2008, at a spot where their camera had recorded nothing just three days earlier.
On March 8, 2008, this asteroid or one of its two moons could make a faint naked-eye star vanish briefly from the sky.
How bad is the light pollution where you live? How many stars can you see on a dark night? Last year the GLOBE at Night project tallied 8,500 star-counting estimates from around the world. That's great but we can do better! All it'll take is 30 minutes and a clear evening between now and…
A huge, remote asteroid could briefly blot out a faint star in Gemini on February 10-11, 2008.
As the first images are released from Messenger's flyby of the innermost planet, previous ground-based observations are proving to be surprisingly accurate.
On Nov. 14, 2007, a star in the constellation Puppis suddenly became visible in binoculars.
On Wednesday, October 24, 2007, this faint comet between the orbits of Mars and Jupiter suddenly became a naked-eye "star."
Using modest gear and a lot of skill, amateur astronomers catch a record-breaking planet crossing the face of its star 250 light-years away.
New calculations indicate that Charon may actually occult an 8.7-magnitude star on Sept. 27, 2007.
Pluto will pass extremely close to an 8.7-magnitude star on September 27, 2007; observers should monitor the star's brightness electronically.
The American Astronomical Society (AAS) is now accepting nominations for the Chambliss Amateur Achievement Award.
Late Wednesday night, September 19–20, 2007, observers across much of North America should watch for a possible occultation by asteroid 146 Lucina's satellite.
Amateur observations of variable star PQ Andromedae are needed on September 11-12, 2007, to ensure a successful Hubble campaign.
A suspected dwarf nova is undergoing its first observed outburst and had reached 9th magnitude as of September 5, 2007. More observations are needed.
Please help us accurately map the edge of the Moon by timing occultations of stars during the August 28, 2007, total lunar eclipse.
On Tuesday morning, August 21, 2007, observers across much of North America should watch for a possible occultation by asteroid 146 Lucina's satellite.
On August 8, 2007, variable-star observer Hiroshi Abe discovered a 9th-magnitude nova in Vulpecula. The AAVSO seeks your observations.
This year's Edgar Wilson Award went to three unique amateur comet discoverers.