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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
SPACE WEATHER
Current conditions
Solar wind
speed: 365.4 km/sec
density: 6.9 protons/cm3
explanation | more data
Updated: Today at 2244 UT
X-ray Solar Flares
6-hr max: A0
2245 UT Dec29
24-hr: A0
2245 UT Dec29
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 29 Dec 07
The sun is blank--no sunspots. Credit: SOHO/MDI
Sunspot number: 0
What is the sunspot number?
Updated 29 Dec 2007
Far side of the Sun:
This holographic image reveals no large sunspots on the far side of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 1
quiet
explanation | more data
Current Auroral Oval:

Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Updated: 2007 Dec 29 2130 UT
What is the auroral oval?
Interplanetary Mag. Field
Btotal: 5.0 nT
Bz: 3.7 nT south
explanation | more data
Updated: Today at 2246 UT
Coronal Holes:
There are no large coronal holes on the Earth-facing side of the sun. Credit: SOHO Extreme UV telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Dec 29 2203 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
01 %
01 %
CLASS X
01 %
01 %
Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at: 2007 Dec 29 2203 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
10 %
10 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
05 %
05 %
SEVERE
12 %
02 %

What's up in Space
December 29, 2007
Where's Saturn? Is that a UFO--or the ISS? What's the name of that star? Get the answers from mySKY--a fun new astronomy helper from Meade.

ASTRO PHOTO-OP: Got a GOTO telescope? On Sunday night, command it to slew to spiral galaxy M33. You'll see not only the galaxy in your eyepiece, but also green Comet 8P/Tuttle. The comet and the galaxy are having a photogenic close encounter--less than half-a-degree apart on Dec. 30 and 31. Günther Strauch of Borken, Germany, has prepared a composite image showing what the view may look like. "It will be a special night for astrophotography," he says.

NEW YEARS COMET: After a 13.6 year absence, Comet 8P/Tuttle is once again traveling through the inner solar system and on Jan. 1st and 2nd it makes its closest approach to Earth--only 24 million miles away. The emerald-colored comet will brighten to a predicted magnitude of 5.8, visible to the unaided eye from dark-sky sites and a fine target for backyard telescopes: sky map.

Last night in the mountains of northern Italy, Giampaolo Salvato took a picture of Comet 8P/Tuttle, see below, using no telescope at all. "This is a 5 minute exposure with my Canon 5D digital camera set at ISO 400," he says.

Click on the image for an even wider view, which encompasses exploding Comet 17P/Holmes, variable star Algol, the Andromeda Galaxy (M31) and some lovely star clusters. Comet Tuttle is racing across this starry expanse for a Dec. 30th encounter with spiral galaxy M33--a can't-miss event for astrophotographers. Stay tuned for photos!

Comet 8P/Tuttle Photo Gallery
[World Map of Comet Sightings]
[sky map] [comet binoculars] [ephemeris] [orbit]

WARNING: Staring at this photo may make you dizzy:

These are star trails--slow, graceful arcs traced by the stars as Earth spins on its axis. "A full 180° rotation of the circumpolar stars can be obtained only at this time of year when the astronomical night lasts more than 12 hours," says photographer Lorenzo Comolli. "I took this all-night picture on Dec. 28-29 using my Canon 350D on a tripod in light polluted Tradate, Italy."

The stubby arc near the center of the swirl is Polaris, also known as "the North Star" because Earth's north pole points almost directly at it. Polaris may be the most famous star in the heavens--but fame is fleeting! Earth's spin axis is precessing and in 10,000 years or so white-hot Vega (six times brighter than Polaris) will take over as North Star. Star trail photos will look even prettier then, with an intense bright dot illuminating the core of the starry whirlpool.

more images: from Don Martel in the Namib Desert of Namibia, Africa; from Larry Landolfi of Rochester, New Hampshire; from Gary Shaw of Flagstaff Arizona.

Near-Earth Asteroids
Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
On December 29, 2007 there were 913 potentially hazardous asteroids.
Dec-Jan Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2007 XZ9
Dec. 1
8.1 LD
18
45 m
2007 VD184
Dec. 9
7.8 LD
18
95 m
3200 Phaethon
Dec. 10
47 LD
14
5 km
2007 YN1
Dec. 15
1.0 LD
15
45 m
2007 XH16
Dec. 24
8.1 LD
13
565 m
2007 TU24
Jan. 29
1.4 LD
10
400 m
Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.
Essential Links
NOAA Space Weather Prediction Center
  The official U.S. government bureau for real-time monitoring of solar and geophysical events, research in solar-terrestrial physics, and forecasting solar and geophysical disturbances.
Atmospheric Optics
  The first place to look for information about sundogs, pillars, rainbows and related phenomena.
Solar and Heliospheric Observatory
  Realtime and archival images of the Sun from SOHO.
Daily Sunspot Summaries
  From the NOAA Space Environment Center
Current Solar Images
  from the National Solar Data Analysis Center
  more links...
©2007, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.
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