M106 (NGC 4258)

Telescope: Planewave 17" CDK reflector, 1940 mm FL
Camera: FLI-PL6303E, 3072 x 2048 pixels
Exposure: Lum: 8 x 4 minutes. Seeing 1.5" FWHM. Processed with Photoshop using LocalNormalization.
Location: Mayhill, New Mexico (Elevation 7380')
Image Center (J2000): RA 12h 18m 46s, Dec 47° 17' 26"
Image Size: 27' x 26'

Spiral galaxy in Canes Venatici. The galaxy's orientation presents prominent and easily visible dust lanes which can be traced into the galaxy's bright central region ending in bright knots. Many HII regions are visible and trace the spiral arms. The galaxy's brightest Cepheid variable at mag 23.1 is fainter than this image's limiting magnitude. The galaxy's brighter star clusters are too close to the core to be resolved. NGC 4248 satellite galaxy at 13th mag is above left separated by 13' has been imaged by Hubble. Lower right is UGC 7356, 16th mag, Dwarf galaxy. Lower left is LEDA 166129 another dwarf galaxy at mag 17. M106 was added to the Messier list in 1947 after the recovery of a letter from Messier's assistant, Pierre Méchain.
Raw data for this image can be downloaded.


M106 (NGC 4258), Spiral galaxy in Canes Venatici. The galaxy's orientation presents prominent and easily visible dust lanes which can be traced into the galaxy's bright central region ending in bright knots. Many HII regions are visible and trace the spiral arms. The galaxy's brightest Cepheid variable at mag 23.1 is fainter than this image's limiting magnitude. The galaxy's brighter star clusters are too close to the core to be resolved. NGC 4248 satellite galaxy at 13th mag is above left separated by 13' has been <a href=/cgi-bin/Single.pl?idimage=95>imaged by Hubble</a>. Lower right is UGC 7356, 16th mag, Dwarf galaxy. Lower left is LEDA 166129 another dwarf galaxy at mag 17. M106 was added to the Messier list in 1947 after the recovery of a letter from Messier's assistant, Pierre Méchain.
 , acquired with a remote telescope at Mayhill, New Mexico (Elevation 7380')

Object Label Identifier Notes
Galaxy G1 2MASX J12175355+4718016 mG=17.8, 0.5' x 0.1'
Galaxy G2 SDSS J121742.97+470456.4 mG=17.3, 0.4' x 0.1'
Galaxy G3 SDSS J121751.76+471212.7 m=18.0
Galaxy G4 SDSS J121820.44+470752.1 m=17.5
Galaxy G5 SDSS J121936.00+470535.2 Dwarf galaxy, 18.7 mag.
Galaxy G7 SDSS J121927.23+471845.1 mG=18.8
Galaxy G8 SDSS J121938.81+472821.5 mG=21.1
Galaxy NGC 4248 NGC 4248 Irregular galaxy, mG=13.2. The only object in this image associated with M106.
Galaxy PGC 166129 PGC 166129 Dwarf galaxy, 17.0 mag.
Galaxy UGC 7356 UGC 7356 Dwarf galaxy, 16th mag
HII Region Unlabeled circles HII Regions. Marked 11 are marked.
Quasar Q1 SDSS J121804.56+470850.1 z=1.743
Quasar Q2 2MASX J12183945+4706275 z=0.0938
Quasar Q3 SDSS J121808.49+471612.7 Blue stellar object. Radio-quiet quasar with high ultraviolet flux that has been red-shifted into the blue region of the spectrum. Radio-quiet because it has exhausted the nearby interstellar gas. z=0.398
Unidentified Unidentified Can't identify this object.

Click on the image to display the plate solved image with annotations. 5' across M106 is about 34,000 light years.