You are viewing the page for Aug. 19, 2007
  Select another date:
<<back forward>> -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
Current conditions
Solar wind
speed: 425.3 km/sec
density: 4.6 protons/cm3
explanation | more data
Updated: Today at 2245 UT
X-ray Solar Flares
6-hr max: A0
2245 UT Aug19
24-hr: A1
0000 UT Aug19
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 19 Aug 07
The sun is blank today--no sunspots. Credit: SOHO/MDI
Sunspot number: 0
What is the sunspot number?
Updated 18 Aug 2007
Far side of the Sun:
This holographic image reveals no sunspots on the far side of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 3
explanation | more data
Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Updated: 2007 Aug 19 2148 UT
Interplanetary Mag. Field
Btotal: 3.3 nT
Bz: 1 nT south
explanation | more data
Updated: Today at 2246 UT
Coronal Holes:
A solar wind stream flowing from the indicated coronal hole should reach Earth later today, Aug. 19th. Credit: SOHO Extreme Ultraviolet Telescope
NOAA Forecasts
Updated at: 2007 Aug 19 2203 UTC
0-24 hr
24-48 hr
01 %
01 %
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 Aug 19 2203 UTC
0-24 hr
24-48 hr
15 %
15 %
01 %
01 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
20 %
20 %
05 %
05 %
01 %
01 %
What's up in Space
August 19, 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.

SPACE SHUTTLE UPDATE: The threat of Hurricane Dean closing mission control in Houston has prompted NASA to recall Endeavour to Earth one day early. The shuttle undocked this morning at 7:56 am EDT and will land in Florida on Tuesday: more.

North Americans should be alert for double-spaceship flybys tonight. Endeavour and the ISS are now separate points of light, and they will soar in tandem over many US cities after dark. Both are bright and easy to see with the naked eye. (continued below)

Above: The eye of Hurricane Dean, photographed from the ISS.

Readers with backyard telescopes, try targeting the ISS as it slowly glides across the sky. You can see solar arrays, laboratory modules, living quarters and more; browse the images below.

ISS images and video: from Stefan Seip of Stuttgart, Germany; from Tom Gwilym of Renton, Washington; from Ralf Vandebergh of the Netherlands; from Hanno Falk of Flensburg, Germany (cross your eyes!); from Dirk Ewers of Hofgeismar, Germany; from Mario Weigand of Offenbach, Germany; from Alberto Zampieron of Italy.

SUN HALOS: "I'm a fan of sun halos! And little by little, this passion has intrigued Lydia, my 7 year old daughter," says Laurent Laveder of Port Navalo, France. "Yesterday morning, I lent her my sunglasses to let her see a nice circumscribed halo. As I was in front of her, explaining her what she was observing I noticed the halo reflected in the glasses, took my camera and snapped."

Click here to view more of Laurent's pictures.

"In the lower part of this picture, you can see a photo taken one minute later showing the halo itself. This picture has been left-right reversed to show the halo as its reflection in the glasses."

Photo details: Canon 30D + Sigma 70-300 lens at 70mm (for the portrait) and Sigma 10-20 lens at 10mm (for the halo).

2007 Perseid Meteor Gallery
Updated Aug. 14, 2007

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 August 19, 2007 there were 878 potentially hazardous asteroids.
July 2007 Earth-asteroid encounters:
Miss Distance
2007 FV42
July 2
53 LD
1.2 km
2007 MB4
July 4
7.6 LD
130 m
2007 DT103
July 29
9.3 LD
550 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 Environment 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, -- This site is penned daily by Dr. Tony Phillips.
©2019 All rights reserved.