IC405 Flaming Star Nebula - Auriga

  1. © Copyright 2017 by Lieven Persoons

M65 in Leo, or NGC3623 or UGC6328 or PGC34612.
RK 11h 18’ 56” / DEC +13° 05’ 32”
7.80’ x 1.50‘ / Vis m: 9.30 / Abs m: -20.45 / Type : Sb
Distance: Lj: 35 000 000 / diam: Ly: 60 000 / Rad.s: 666 km/s.

Messier 65 (also known as NGC 3623) is an intermediate spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by Charles Messier in 1780. Along with M66 and NGC3628, M65 forms the Leo Triplet, a small  group of galaxies.

M65 was discovered by Charles Messier and included in his Messier Objects list. However, William Henry Smyth accidentally attributed the discovery to Pierre Méchain in his popular 19th century astronomical work A Cycle of Celestial Objects (stating "They [M65 and M66] were pointed out by Méchain to Messier in 1780"). This error was in turn picked up by Kenneth Glyn Jones in Messier's Nebulae and Star Clusters. This has since ramified into a number of other books by a variety of authors.

Star formation:
The galaxy is low in dust and gas, and there is little star formation in it, although there has been some relatively recently in the arms. The ratio of old stars to new stars is correspondingly quite high. In most wavelengths it is quite uninteresting, though there is a radio source visible in the NBSS, offset from the core by about two arc-minutes. The identity of the source is uncertain, as it has not been identified visually, or formally studied in any published papers.

Interaction with other galaxies:
To the eye, M65's disk appears slightly warped, and its relatively recent burst of star formation is also suggestive of some external disturbance. Rots (1978) suggests that the two other galaxies in the Leo Triplet interacted with each other about 800 million years ago. Recent research by Zhiyu Duan suggests that M65 may also have interacted, though much less strongly. He also notes that M65 may have a central bar—it is difficult to tell because the galaxy is seen from an oblique angle—a feature which is suggestive of tidal disruption.
(From Wikipedia.org)

General Info


Image Data

Optics : TMB 152 @ f/8
Mount : 10micron GM2000 HPS II
Camera : Finger Lakes Instumentation FLI ML8300 cooled -40°C
Filterweel Finger Lakes Instumentation FLI CFW 5-7 with 50x50mm filters
Filters : Astrodon Gen2 Tru-Balance E-series LRGB  + Baader Ha 7nm 50x50mm
Exposures : total, 28h30 - H-alfa L: 430:610 (1x1 bin) RGB: 225:215:230 (2x2 bin)
Location : Verclause (France)
Date : 26/02/2017 & 16, 17, 20, 21, 28, 29, 30, 31/03/2017 & 18, 23, 24/04/2017
Comments : Data acquired remotely. Mount tracking unguided.

Size :



M65 (left) - M66 (right) - Galaxies in Leo