M45 Pleiades

M45 Pleiades

The Pleiades also known as the Seven Sisters and Messier 45, are 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 the naked eye in the night sky.

The cluster is dominated by hot blue and luminous stars that have formed within the last 100 million years. Reflection nebulae around the brightest stars were once thought to be left over material from the formation of the cluster, but are now considered likely to be an unrelated dust cloud in the interstellar medium through which the stars are currently passing.

Computer simulations have shown that the Pleiades were 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.
(c) Wikipedia

NEQ6 mount, ED80 (520mm at 1/6.5), QHY8, 20 x 600s. Guilde – 50×9 finderscope with QHY5 camera. Total exposure – 3 hours.

Captured in MaxIm DL, processed in MaxIm DL, DSS, FitStacker and Pixinsight.

Posted by sergiy.vakulenko on 2019-01-17 10:33:47

Tagged: , Astronomy , Astrophotography , Astrophoto , Deepsky , DSO , Space , Sky , Stars , Cluster , M45 , Pleiades , ED80 , QHY8

One-Armed Spiral Galaxy NGC 4725

One-Armed Spiral Galaxy NGC 4725

Explanation: While most spiral galaxies, including our own Milky Way, have two or more spiral arms, NGC 4725 seems to have only one. In this sharp color image, the solo spira mirabilis is tightly wound, traced by bluish, newborn star clusters. The odd galaxy also sports obscuring dust lanes, a prominent ring, and a yellowish central bar structure composed of an older population of stars. NGC 4725 is over 100 thousand light-years across and lies 41 million light-years away in the well-groomed constellation Coma Berenices. Computer simulations of the formation of single spiral arms suggest that they can be either leading or trailing arms with respect to a galaxy’s overall rotation. (text: apod.nasa.gov/apod/ap090606.html)
This picture was photographed April 11-17 2013 in Khlepcha observatory, Ukraine.
Equipment: reflector S&D 10 in; f/4.7
Mount WhiteSwan-180, camera QSI-583wsg, Tevevue Paracorr-2. Off-axis guidecamera Orion SSAG.
LRGB filter set Baader Planetarium.
L=39*600 sec. bin.1 RGB: 19*450-600 sec. each channel, bin.2 Total 14.5 hours.
Processed Pixinsight 1.8 and Photoshop CS6

Posted by Oleg Bryzgalov on 2013-04-21 12:05:43

Tagged: , astrophoto , NGC4725 , NGC4747 , NGC4712 , Astrometrydotnet:version=14400 , Astrometrydotnet:id=alpha-201304-97189203 , Astrometrydotnet:status=solved , astro:subject=NGC4725 , astro:gmt=2013-04-19T01:26 , deepspace , competition:astrophoto=2013