SUNSET: 
Usando un Mapa con Su Telescopio
Lo esencial de la navegación por el cielo con un telescopio y atlas de estrellas.
Seleccionando Su Primer Telescopio
Cada año millones de personas compran telescopios, pero pocas tienen una buena idea de qué deben buscar (o evitar) cuando vayan en busca de su instrumento nuevo.
Transparency and Atmospheric Extinction
Even when the air is perfectly clear, a significant fraction of starlight is lost in the atmosphere. And when there's a lot of haze or your target is close to the horizon, atmospheric extinction is a major problem.
Forecasting Haze
Here are links to some websites that can help you predict where and when you'll get good transparency for deep-sky observing.
Comet Boattini Brightens
During May and June 2008, this visitor may be dimly visible without a telescope — but only if you live in the Southern Hemisphere.
Another Bright Nova, This Time in Sagittarius
Just magnitude 9 when discovered on April 18, 2008, this nova in Sagittarius has brightened tenfold.
Found in Cygnus: A 7th-Magnitude Nova
Two Japanese amateurs captured the new star on April 10, 2008, at a spot where their camera had recorded nothing just three days earlier.
A Triple Occultation by Eugenia and Its Moons
On March 8, 2008, this asteroid or one of its two moons could make a faint naked-eye star vanish briefly from the sky.
Possible Occultation by Varuna Sunday Night
A huge, remote asteroid could briefly blot out a faint star in Gemini on February 10-11, 2008.
Nova in Puppis
On Nov. 14, 2007, a star in the constellation Puppis suddenly became visible in binoculars.
Comet Holmes Undergoes Huge Outburst
On Wednesday, October 24, 2007, this faint comet between the orbits of Mars and Jupiter suddenly became a naked-eye "star."
An Occultation by Pluto's Moon Charon?
New calculations indicate that Charon may actually occult an 8.7-magnitude star on Sept. 27, 2007.
Occultations by Possible Rings of Pluto This Week
Pluto will pass extremely close to an 8.7-magnitude star on September 27, 2007; observers should monitor the star's brightness electronically.
New Chance To Confirm Asteroid Lucina's Moon
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.
Help Prepare for Hubble Study of PQ And
Amateur observations of variable star PQ Andromedae are needed on September 11-12, 2007, to ensure a successful Hubble campaign.
Surprise Outburst of a New Dwarf Nova
A suspected dwarf nova is undergoing its first observed outburst and had reached 9th magnitude as of September 5, 2007. More observations are needed.
Map the Moon During Tomorrow's Lunar Eclipse
Please help us accurately map the edge of the Moon by timing occultations of stars during the August 28, 2007, total lunar eclipse.
Opportunity to Confirm an Asteroid's Moon
On Tuesday morning, August 21, 2007, observers across much of North America should watch for a possible occultation by asteroid 146 Lucina's satellite.
"New Star" in Vulpecula
On August 8, 2007, variable-star observer Hiroshi Abe discovered a 9th-magnitude nova in Vulpecula. The AAVSO seeks your observations.
Spectacular Occultation and Graze of Regulus
The year's best grazing occultation in North America occurs on June 19-20, 2007, when the waxing crescent Moon covers Regulus (Alpha Leonis).
