NGC 7139

About image 

NGC 7139 is a planetary nebula located in the constellation of Cepheus. 

It was discovered by Hershel in 1787, but only in 1918 it was understood it is a planetary nebula. 

Its diameter is 77” and its visual magnitude 13, while the central star has magnitude 18.72. 

This nebula has a good emission in both Ha and OIII wavelenght and its structure is somewhat reminiscent of the more famous nebula M27: indeed it is characterized by the presence of two bright condensations  while, on the perpendicular axis, two faint  lobes are visible.

Technical data
Optic          GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount        10Micron GM2000 HPSII
Camera         Moravian G3-16200 with external filter wheel 7 positions
Filters         Astrodon 50mm narrowband filters Ha 5nm and OIII 5nm
Guiding system    OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details  Ha 67x300" bin2 -10C

                OIII 67x300" bin2 -10C
Total integration  11,2h
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5
SQM-L       20.0 (images taken with the presence of Moon)    
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date           31 July / 6-7 August 2020


© Roberto Marinoni 2019 - All rights reserved