David's Astronomy Pages (Stellar & Deep Sky) Maffei 1 Galaxy Group

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The Maffei 1 Group (also know as IC 342 Group) is a group of galaxies in Cassiopeia and Camelopardalis.  The galaxies of the group probably once formed a subgroup of our Local Group, which during the dynamical history of the group, have been ejected because of a violent encounter with the Andromeda Galaxy M31. Since, they have moved away to an about 10 million light years distance.

Maffei 1 / IC 342 Galaxy Group (distances in million light years)
	IC 342 - Spiral Galaxy (Caldwell 5) - 10.0 mly
	Maffei 1 - Elliptical Galaxy - 10.0 mly
	Maffei 2 - Spiral Galaxy - 10.0 mly
	PGC 100170 - Galaxy (Dwingeloo 1) - 9.1 mly
Possible Members
	NGC 404 - Elliptical Galaxy (Mirach's Ghost)
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IC 342 - Spiral Galaxy (Caldwell 5) - 10.0 mly

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Maffei 1 - Elliptical Galaxy - 10.0 mly

Maffei 1 is a galaxy lying in the plane of the Milky Way and is largely obscured by dust.  

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Maffei 2 - Spiral Galaxy - 10.0 mly

Maffei 2 is a galaxy lying in the plane of the Milky Way and is largely obscured by dust.  
Two sets of images of Maffei 2  were acquired (one set through Visual (V) and on set through Infrared (I) filter). These showed that the galaxy was visible in infrared , whilst at the same time practically invisible in visual band. 

Maffei 2 / UGCA 39 (Cassiopeia) Maffei 2 discovered in 1968 by italian astronomer Paolo Maffei, using infrared film
Maffei 2 in V band (visual)		Maffei 2 in I band (infrared)
CCD Image 5 x 2 minutes (average combine), 2x2 binning, V Filter  2006-08-06 00:36 hUT (#132159-63)		CCD Image 5 x 2 minutes (average combine), 2x2 binning, I Filter  2006-08-06 00:25 hUT (#132154-58)

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Dwingeloo 1 (PGC 100170) - Spiral Galaxy - 9.1 mly

PGC 100170 / Dwingeloo 1 (Cassiopeia) Central core of the galaxy is just detectable at centre of image (two large spiral arms are too faint to be seen) Dwingeloo 1 was only recently discovered in 1994
CCD Image (cropped) 4 x 120s exposure (average combine), 3x3 binning, I Filter 2009-12-26 20:01h UT (#408152-55) 12" LX200R  (at f/5.7) + ST-10XME
Negative CCD Image (cropped) Image details as above
PGC 100170 - detail Central core of the galaxy is just visible in the centre of image. Bright star in bottom left is the double star Struve 321  (components Mag +9.1 & +10.1, separation 19 arc sec)
CCD Image (cropped) Image details as above
Comparison of images of PGC 100170,
Image through 12" LX200R Aberdeenshire, UK		Image from a big telescope at Isaac Newton Telescope Group,  La Palma, Spain
CCD Image Slightly smoothed, Alternate Black/White adjustment Image details as above 12" LX200R  (at f/5.7) + ST-10XME		Image by S. Hughes & S. Maddox  (IoA, Cambridge) et al.,  Astronomy Picture of the Day, 2000 January 9 image at apod.nasa.gov details at apod.nasa.gov  Isaac Newton Telescope

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Dwingeloo 2 (PGC 101304)  - Galaxy - 10.0 mly

Mag = + 20

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Possible Maffei I Group Members

NGC 404 - Elliptical Galaxy (Mirach's Ghost)

NGC 404 / Herschel II-224 (Andromeda)  Spheroid Galaxy close to Mirach (mag +2) It lies around 10.3 million light years away, just outside the Local Group

CCD Image (Linear Scale, cropped) 7 x 20 sec (average combine),  3x3 binning, C Filter 2009-09-20 03:00 h UT  (#389493-99) 12" LX200R  (at f/5.7) + ST-10XME

NGC 404 - detail black strip is blooming spike from Mirach.

Negative CCD Image (200% size, cropped) Image details as above

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More Information

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