Daily Archives: September 6, 2013

Sun online. Solar activity. 06 September 2013

According to data of Royal Observatory of Belgium:
solar activity has been eruptive during the past 24 hours, featuring two low C flares from NOAA AR 11836 and 11837. More C flares are likely within the next 48 hours, with a slight chance for an M flare.The solar wind speed ranged between 380 and 470 km/s in the past 24 hours. In the same period, the Interplanetary Magnetic Field was low around 3 to 5 nT. The geomagnetic activity was at quiet levels (K Dourbes between 1 and 3; NOAA Kp between 1 and 2) during the past 24 hours. Quiet geomagnetic conditions (K Dourbes < 4) are expected for September 6 to 8.

Local time:9/6/2013 at 16:40:24 Local time:9/6/2013 at 16:40:24 Local time:9/6/2013 at 16:40:24 Local time:9/6/2013 at 16:40:24Equipment: Coronado 90 + SBIG 8300s + LX75
Editor: Photoshop
Date: 06/09/13
Time GMT: 13:30:00
Exposure 0.09 sec.

With SPONLI Space is getting closer!

Pleiades

m45b

In astronomy, the Pleiades (/ˈplaɪ.ədiːz/ or /ˈpliː.ədiːz/), or Seven Sisters (Messier object 45 or M45), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to thenaked eye in the night sky. The name Pleiades comes from Greek mythology; the celestial entity has several meanings in different cultures and traditions.

The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years. Dust that forms a faintreflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the alternate name Maia Nebula after the star Maia), but is now known to be an unrelated dust cloud in the interstellar medium, through which the stars are currently passing. Computer simulations have shown that the Pleiades was probably formed from a compact configuration that resembled the Orion Nebula. Astronomers estimate that the cluster will survive for about another 250 million years, after which it will disperse due to gravitational interactions with its galactic neighborhood.

Date: 01.09.2013
Time: 02:00 (GMT)
Equipment: Canon EOS 600D + EF70-200 f / 4 L + SynScan AZ (20x30sec, ISO 1600)
Editor: DSS + FSIV + PS

Author
member of the project SPONLI
Amateur astrophotographer Pavel Konstantinov

Andromeda Galaxy

andromeda

The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years (2.4×1019 km) from Earth in the Andromeda constellation. Also known as Messier 31, M31, or NGC 224, it is often referred to as the Great Andromeda Nebula in older texts. The Andromeda Galaxy is the nearest spiral galaxy to our Milky Way galaxy, but not the closest galaxy overall. It gets its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. The Andromeda Galaxy is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 30 other smaller galaxies. Although the largest, the Andromeda Galaxy may not be the most massive, as recent findings suggest that the Milky Way contains more dark matter and could be the most massive in the grouping. The 2006 observations by the Spitzer Space Telescope revealed that M31 contains one trillion (1012) stars: at least twice the number of stars in the Milky Way galaxy, which is estimated to be 200–400 billion.

Date: 01.09.2013
Time: 01:00
Equipment: Canon EOS 600D + EF70-200 f / 4 L + SynScan AZ (20x30sec, ISO 1600)
Editor: DSS + FSIV + PS

author:
member of the project SPONLI
Amateur astrophotographer Pavel Konstantinov

The Quiet Sagittarius A*

sgra_gasChandra
Credit: X-ray – NASA / CXC / Q. Daniel Wang (UMASS) et al., IR – NASA/STScI Explanation: Hot gas is hard to swallow. At least that seems to be true for the supermassive black hole at the center of our Milky Way Galaxy. Known as source Sagittarius A*, the Milky Way’s black hole is centered in this infrared (red and yellow hues) and X-ray (blue) composite. Based on data from an extensive campaign of observations by the orbiting Chandra X-ray telescope, the diffuse emission surrounding the black hole is seen in the close-up inset, the inset field spanning about 1/2 light-year across the galactic center some 26,000 light-years away. Astronomers have found that the X-ray emission originates in hot gas drawn from the winds of massive young stars in the region. The Chandra data indicate that only about 1% or less of the gas within the black hole’s gravitational influence ever reaches the event horizon, losing enough heat and angular momentum to fall into the black hole, while the rest of the gas escapes in an outflow. The result explains why the Milky Way’s black hole is so quiet, much fainter than might be expected in energetic X-rays. It likely holds for most supermassive black holes in galaxies in the nearby Universe.