Deep Sky Object in Summer
B142 & B143 (Dark Nebulae in Aquila)
|Date & Time: ||Aug 16 2012, from 24:59 to 25:31 JST(+0900)
|Composed 4 shots with 6 minutes exposed|
|Optical: ||TAMRON SP300mmF2.8 with a conversion lens (f=420mm, Aperture: F4.0)
|with IDAS LPS-P2-FF Light-pollution suppression filter|
|Auto-guided with TAKAHASHI EM-200 Equatorial
|Digital Camera: ||Canon EOS 550D (Remodeled)
|Location: ||Oogawara pass, Saku city, Nagano pref.|
|Camera Settings: ||Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)|
The constellation of Aquila surprisingly includes no Messier objects in spite of being soaked in the summer's Milky Way.
But you'll be fascinated with various dark lanes being tangled in the Milky Way through small binoculars,
and especially, dark nebulae B142 and B143 (registered in the Barnard's catalogue) are the most striking and vastest ones in them.
They're positioned at about 3 degrees NW of Altair (alpha Aquilae).
|B143 / Dark Nebula, type 6 Ir|
|R.A.||19h 40m 42.0s (2000.0)|
|Dec.||+10° 57' 00" (2000.0)|
This group of dark nebula looks like a Greek letter of zeta, and is devided into two segments of north (B142) and south (B143) ones.