Planetary nebulae are the remains of stars. The name "planetary nebula" comes from the first observations of these objects, sometimes having a circular aspect.
The colors observed from the various elements that emit more or less ionized each in a very specific wavelength, mainly Hydrogen and Oxygen.
Helix nebula is considered one of the closest to Earth, only 700 light years away.
BEST DETAILS
https://www.astrobin.com/full/bd68tq/0/ ... do_Menezes
Equipment
Apo 150mm Scientific Explorer
Qhy 16200a colled
Filter: Planetarium Baader HSO 2 "
35x 300 "bin1 HALPHA + 17 x 300" bin1 S2, OIII
Electronic Focuser: Moon Lite
Mount: Ioptron Cem60
Polar alignment: Sharcap
Capture: Sequence Generation Pro
Processing: Photoshop CS6, Pixinisight
Seeing: 4
Transparency: 5
June 11, 12 and 13, 2020
Jales-SP-Brazil
Copyright: Fernando Oliveira de Menezes
Email: Barretosmed@hotmail.com