Aureole effect of the Venus (Jun 6, 2012)


Date & Time: Jun 6 2012, 13:39:11 JST(+0900), 1/1.3sec. exposed
Optical: PENTAX 7.5cm(2.9") ED refractor with PowerMate 2.5X (f=1250mm, F16.7)
with BaaderPlanetarium AstroSolar filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Nikon D700
Location: Joetsu city, Niigata pref.

Camera Settings: Recording Format...JPEG-FINE(4256 x 2832)
Device Size...FX format (36 x 24mm)
Sensitivity...ISO400, White Balance...Daylight


This image shows you the Venus transit on Jun 6, 2012 when the half of Venus has left from solar surface between 3rd and 4th contact. Although some clouds interfered the field of view frequently, perhaps you can realize that the Venusian rim looks gleaming faintly. This light is from the atmosphere of Venus shone by the sun, called "Aureole effect". For example we cannot detect such phenomena in solar eclipse because the Moon has no dense atmosphere. The light of Aureole effect is extraordinary dim, we need good seeing condition and fairly large-ranged telescope to detect it, and of course patience to wait for next Venus transit until Dec 2117...


Comparison of White-light & H-alpha at 3rd to 4th contacts
Venus transit on Jun 8, 2004

Copyright(c) 2012 by Naoyuki Kurita, All rights reserved.
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