Transcript July2016POSx

“Light Pollution” by Mike Knell is licensed under CC by 2.0
https://www.flickr.com/photos/mpk/171117951/ This work is a derivative.
“Milkyway” by Lonely Speck is licensed under CC BY-SA 4.0.
http://www.lonelyspeck.com/wp-content/uploads/2013/03/milkyway-xe1-1.jpg
Turnoff outdoor lights when not needed.
Use timers and motion sensors.
Use shades to direct light down.
Keep outdoor lights below 60 watts.
Want to know more?
Ask a TCAA member or visit www.darksky.org!
Tonight’s Presentation
Mars and Saturn
Credit: NASA.gov
This program will be held even under overcast skies. But we may cancel if it rains.
Why so dark here?
So you can dark adapt!
• It takes about a half
hour for your eyes
to adjust to the
dark.
• You need to dark
adapt to be able to
see faint starlight.
Supernova 1994D in Galaxy NGC 4526. Credit: NASA, ESA, The Hubble Key Project Team, and The High-Z Supernova Search Team. http://hubblesite.org/gallery/album/the_universe/pr1999019i/
Dark adapt like a pro!
• Point car lights away from the observing area
• Use a flashlight with a red filter
• Aim light down, away from direct view
Want to know more?
Ask a TCAA member or visit www.tcaa.us!
Come See Us Again!
August 6
8:30
Globular Clusters of the Milky Way
September 3
8:00
The Heart of the Milky Way Galaxy
October 1
7:00
Fading Glories of the Summer
Triangle
These programs will be held even under overcast skies. But we may cancel if it rains
Like us!
Twin City Amateur Astronomers - TCAA
Follow us!
@tc_astro
Coming to Illinois August 2017…
Credit: Exploratorium
What is light pollution?
Photo by NASA
It is unintended brightening of the night sky
Photographs © Todd Carlson.
TCAA Giveaway!
At our October Public Observing session we will
draw the name of one lucky winner of a
Celestron® 114LCM
Computerized Telescope
This is a 114mm reflector telescope with a
computerized database of 4000 objects.
Entry is free but is limited to one entry per family at each observing session. You do not need to be present to win.
What is glare?
Overly bright light that makes it difficult to see…
Source: www.darksky.org
Using your binoculars, look to the south to find M24, the Sagittarius Star Cloud
In the southern sky, find the 3 vertical stars
that form the tail of Scorpius
Then look to the Southeast to find the 8
stars that form the teapot in Sagittarius
The M24 Star Cloud, located above the
teapot, contains about 1000 stars.
Credit: Stellarium
What we do
We can do even better with you!
Want to know more?
Become a TCAA member today! www.tcaa.us