Daily Archives: August 12, 2014

Collapse in Hebes Chasma on Mars 


Image Credit & Copyright: 
ESA/DLR/FU Berlin (G. Neukum)

 What’s happened in Hebes Chasma on Mars? Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Since the depression is unconnected to other surface features, it is unclear where the internal material went. Inside Hebes Chasma is Hebes Mensa, a 5 kilometer high mesa that appears to have undergone an unusual partial collapse — a collapse that might be providing clues. The above image, taken by the robotic Mars Express spacecraft currently orbiting Mars, shows great details of the chasm and the unusual horseshoe shaped indentation in the central mesa. Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. A recent hypothesis holds that salty rock composes some lower layers in Hebes Chasma, with the salt dissolving in melted ice flows that drained through holes into an underground aquifer.

APOD NASA 12-Aug-14

The Sun Online and solar activity. August 12, 2014

There were no C flares during the past 24 hours. In the next 48 hours, eruptive conditions (C flaring) are possible, especially from AR 2139, 2137, and 2134.Over the past 24 hours, solar wind speed as observed by ACE increased from about 420 to a maximum of 560 km/s and then decreased again till the current values around 440 km/s. This is probably the effect of a coronal hole high speed stream. The magnitude of the Interplanetary Magnetic Field (IMF) varied between 4 and 9 nT. Over the past 24 hours, geomagnetic conditions were quiet (K Dourbes between 1 and 3; NOAA Kp between 1 and 3). Quiet geomagnetic levels (K Dourbes < 4) are expected on August 12, 13 and 14, with possible excursions to active levels on August 13 due to the expected arrival of a coronal hole high speed stream.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 08/12/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli


Sharpless 2-308 in Canis Major

Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years

Imaging telescopes or lenses: Astro-Physics 152mm f/7.5 Starfire EDF
Imaging cameras: FLI ProLine Proline 16803
Mounts: Software Bisque Paramount MX
Guiding telescopes or lenses: Takahashi FS-60C
Guiding cameras: Starlight Xpress Superstar
Focal reducers: Astro-Physics AP 4.0″ Field Flattener
Software: PixInsight 1.8, FocusMax, Maxim DL Pro 5, Software Bisque TheSky6 Professional, Photoshop CS Photo Shop CS5, CCD Autopilot 5
Filters: Astrodon E-series LRGB Ha 5nm
Accessories: Sirius Dome
Dates: Feb. 21, 2014
Locations: Sydney Australia
Frames: 19×1200″
Integration: 6.3 hours

Author: David Nguyen
AstroPhotography of the day by SPONLI 12 Aug 2014