| Subject: | [OM] Leonid advice, links |
|---|---|
| From: | Tom@xxxxxxxxxxxxx |
| Date: | Sat, 17 Nov 2001 11:06:38 -0500 |
The 2001 peak in North America will probably be Sunday Morning,
5:04 am EST, and Monday morning in western pacific / eastern asia.
See bottom of this message for times/places
You may also want get up real early Monday and Tuesday mornings
to look as well because the Leonids are active for several days.
Some Ottawa photographers are meeting at the RA Centre at 3am to
go to Beckwith Park near Carleton Place. All welcome.
http://groups.yahoo.com/group/oaog/files/Maps/BeckwithPark.jpg
http://www.valleyfinder.com/cp/cpsc/CP_Docs/Map
df
Please park outside the park so that car lites won't destroy observers'
nite vision.
Leonid Refs:
http://groups.yahoo.com/group/oaog/message/4575
http://comets.amsmeteors.org/meteors/showers/leonids.html
http://www.skypub.com/sights/meteors/3showers.html
http://science.nasa.gov/headlines/y2001/ast08nov_1.htm?list599221
http://www.hometown.aol.com/theleonids/index.html
http://www.popastro.com/sections/meteor/leonids.htm
Leonids are also well known for sometimes leaving visible trails in the
sky as they disintegrate, especially near dawn or dusk when the sun
can catch them.
BRING
- Red lights only so we can keep our night vision. Rear bike lites are
excellent if you can get a steady, not flashing, lite.
- Warm clothes - wool socks, toque, sweaters, wind jacket, ski mitts,
long johns, ....
- Hot drinks in thermoses
- Snacks
- Chaise Longue (ideal) or camp mat to lie down & observe the sky
- Sleeping bag
- compass & sky map (not essential)
METEOR PHOTO TIPS
PHOTO PREPARATION
- Make a dew shield for your camera & lens of lightweight foam, e.g.
the blue camp mat type, with ways to attach without blocking lens
- Buy hand warmers (chemical, phase change) to ward off dew on
lens
- Buy fast film, e.g. Kodak Ektachrome P1600, Fuji Superia 1600 ,
Neopan 1600, Tmax 3200. These are expensive, You may want to try
400 or 800 speed. You can ask any of these stores to push the films 1,
2, or 3
stops.
- Load film & take one normal frame, e.g. flash pic, on your film to
guide the film processor as to frame spacing for printing or slide
mounting
BRING FOR PHOTOGRAPHY
- Locking cable releases for "bulb" exposures of 5-25 minutes
- Multiple camera bodies, tripods, brackets, beanbags for different sky
areas. Mechanical shutters are best - OM1, OM3
- Wide or normal lenses.
- Extra camera batteries if your shutter is electronic.
- Biggest lens hoods you have to protect from dew
- Lens tissue for cleaning any dew off
TAKING PHOTOS
- Check your lens for dew before each shot. No filters!
- Tape your lens to the widest aperture and infinity focus to avoid
disturbing it. Turn off autofocus, autoexposure.
- Point the camera away from any city glow. You may want to include
the horizon for pictorial effect.
- See http://www.covingtoninnovations.com/astro/astrezip.exe for an
astronomical exposure calculator. Check the exposure to _avoid_
skyglow.
- Use widest aperture, infinity focus, 2-25 minutes or until a
spectacular meteor goes by in view. Use shorter exposures (2-10 min)
with fastest films and widest (in absolute terms - mm) apertures in
order to avoid skyglow.
- You may want to keep track of your exposures for future reference &
to refine your technique. For a form, see
http://www.analemma.de/english/exptable.html
- Bracket!
- Don't forget to enjoy the experience!
AFTER
- Glow
- Take some normal photos to guide film cutter
- Warn film processor there are sky shots with no clear frame
lines!!
- (perhaps) Ask for film NOT to be cut
More Metor photo advice:
http://www.astronomy.com/Content/Dynamic/Articles/000/000/000/100
ewopl.asp
http://www.cyprusastronomy.com/Astrophotography.html
http://www.astronomy.com/Content/Dynamic/Articles/000/000/000/495
skhar.asp
http://www.astropix.com/HTML/I_ASTROP/METEORS.HTM
http://members.home.net/observers-
group/Meteors/IntroPhoto.htm
http://homepages.primex.co.uk/~sproston/sstar8d.htm
Good Luck!
2001 Leonid Forecasts
North America
9:00 - 11:00 UT
Sunday Morning, Nov 18th:
4:00 - 6:00 a.m. in New York
1:00 - 3:00 a.m. in Los Angeles
ZHR: 800 - 4000 per hour
California, Hawaii, Samoa
11:00 - 15:00 UT
Sunday Morning, Nov 18th:
3:00 - 7:00 a.m. in Los Angeles
1:00 - 5:00 a.m. in Hawaii
ZHR: 100 - 1000 per hour
Australia, Indonesia, Japan, east Asia
17:00 - 19:30 UT
Monday Morning, Nov 19th:
0100 - 03:30 a.m. in Hong Kong
0200 - 04:30 a.m. in Tokyo
ZHR: 800 - 8000 per hour
Table notes: (1) UT is Universal Time, also known as Greenwich
Mean Time or GMT. UT values above refer to Nov. 18th. (2) Because
of the international date line, observers in Australian and Asian
countries will see their Leonids before dawn on Nov. 19th local time.
(3) ZHR is the Zenithal Hourly Rate -- that is, the number of meteors a
observer with ideally dark skies would see if the constellation Leo
were directly overhead. The range in predicted ZHRs reflects
differences among the models of various forecasters.
------- Quidquid latine dictum sit, altum viditur -------------------
,__@ Tom A. Trottier +1 613 860-6633 fax:231-6115
_-\_<, 758 Albert St., Ottawa Ontario Canada K1R 7V8
(*)/'(*) ICQ:57647974 Tom@xxxxxxxxxxxxx N45.412
W75.714
---------------------------------------------------------------------
Laws are the spider's webs which, if anything small falls into them
they ensnare it, but large things break through and escape.
--Solon, statesman (c.638-c558 BCE)
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety." -- Benjamin Franklin
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