Nebulas
Abell 21
The Medusa Nebula is a planetary nebula in the constellation of Gemini. It is also known as Abell 21 and Sharpless 2-274. It was originally discovered in 1955 by University of California, Los Angeles astronomer George O. Abell, who classified it as an old planetary nebula. Until the early 1970s, the nebula was thought to be a supernova remnant. With the computation of expansion velocities and the thermal character of the radio emission, Soviet astronomers in 1971 concluded that it was most likely a planetary nebula.
SII = 22 * 1800 sec. bin1, Ha = 19 * 1800 sec. bin1, OIII = 17 * 1800 sec. bin1
Total 29 hours.
Pixinsight 1.8. 2017-2023 years.
NGC 1333
NGC 1333 is a reflection nebula located in the northern constellation Perseus, positioned next to the southern constellation border with Taurus and Aries. It was first discovered by German astronomer Eduard Schönfeld in 1855.
L = 60 * 600 sec. bin1, L = 24 * 1800 sec. bin1, RGB = 10 * 900 sec. bin2, Ha = 12 * 1800 sec. bin1, OIII = 10 * 1800 sec. bin1
Total 40,5 hours.
Pixinsight 1.8.
2017 - 2023 years.
IC 405
IC 405 (also known as the Flaming Star Nebula, SH 2-229, or Caldwell 31) is an emission and reflection nebula[1] in the constellation Auriga, surrounding the bluish star AE Aurigae. It shines at magnitude +6.0. The nebula is shot in narrow-band and processed in the SHO palette.
SII = 15 * 1800 sec. bin1, Ha = 13 * 1800 sec. bin1, OIII = 21 * 1800 sec. bin1
Total 24.5 hours.
Processing - Pixinsight 1.8, the final processing in Photoshop.
November-December 2019, January-March 2020
NGC 6210
NGC 6210 (another designation - PK 43 + 37.1) is a planetary nebula in the constellation Hercules. The object is located at a distance of 7450 light years from the solar system. The apparent magnitude is 8.8. The aApparent size of the object is 0.35 '.
L = 28 * 600 sec. bin1, RGB = 15 * 900 sec. bin2, Ha = 41 * 900 sec. bin1, OIII = 20 * 600 sec., 33 * 900 sec., bin1
Total - 37.75 hours.
Processing - Pixinsight 1.8, the final processing in Photoshop.
April-May 2019, March-May 2020