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M81 Galaxy and M82 Galaxy

Other verisons of the above image.

• Negative image
  • Negative image shows a hint of the Integrated Flux Nebula around M81 and top right corner
• Negative image with labels
• Positive image

Objects Information
M81 Galaxy and M82 Galaxy

• Astronomy Picture of the Day
  • M81: Feeding a Black Hole 2008 June 27
  • The M81 Galaxy Group Through the Integrated Flux Nebula 2008 May 12
  • Galaxy Wars: M81 versus M82 2008 March 25
  • Bright Spiral Galaxy M81 from Hubble 2007 May 29
  • Bright Spiral Galaxy M81 in Ultraviolet from Galex 2007 May 15
  • M81 in Ursa Major 2007 April 27
  • Bright Galaxy M81 2006 July 7
  • M82: Galaxy with a Supergalactic Wind 2006 April 25
  • Galaxy Wars: M81 versus M82 2006 April 15
• Wikipedia Messier 81
• Wikipedia M81 Group
• Wikipedia Messier 82
• SEDS M81
• SEDS M82
• Hubble Photographs Grand Design Spiral Galaxy M81

Other Bright Galaxies in the Image

• NGC3077 in NASA/IPAC Extragalactic database
• SDSS J095702.62+683534.0 in NASA/IPAC Extragalactic database
• Holmberg IX in NASA/IPAC Extragalactic database
• 2MASX J09531018+6900017 in NASA/IPAC Extragalactic database
• 2MASX J09491724+6925199 in NASA/IPAC Extragalactic database

Faint 15 to 19 Magnitude Galaxies
See Negative image with labels.

• SDSS J095830.62+694840.6 in SDSS database
• SDSS J095807.90+693601.6 in SDSS database
• SDSS J095805.74+693446.9 in SDSS database
• SDSS J095910.63+691528.2 in SDSS database
• SDSS J095658.56+691011.0 in SDSS database
• SDSS J095903.74+690657.0 in SDSS database
• SDSS J095830.44+690204.4 in SDSS database

Faint 20.08 R Magnitude Galaxy Analysis

SDSS J095724.20+690702.1 is at the end of yellow arrow > in the negative image. Below images are full scale, calibrated, screen stretched, cropped and inverted in AIP4WIN V2.2.

Below are graphs in Diffraction Limited MaxIm DL V5.03

Below is a screen capture of SDSS Navigate Tool with SDSS J095724.20+690702.1 in the square box.

Image Information

• Field of view: 118 arcminutes wide x 77.1 arcminutes high
• Image is half size
• North is top and west is right
  
• Exposure: 25 images x 120 seconds per image (50 minutes total)
• Note: Eight images taken and not used because of clouds
• CCD-TEMP: -30°C
• Signal to Noise of the background with no stars
  • Background average 340.559/background Std Dev 1.548 = Signal to Noise 219.999
• Astronomik Type IIc Luminance filter
• Guided

Observing Information

• OBS-Location: Oregon Star Party (OSP), OR USA
• TIME-Local of first image = 11:53 PM August 30, 2008
• TIME-Local of last image = 12:53 AM August 31, 2008

Imaging Equipment

• CCD camera: QSI 532ws-M1 (9.7mm x 14.9mm)
• Telescope: Tele Vue NP-101is APO refractor (4 inch dia., focal length = 540, f/5.4)
• Focal reducer: Tele Vue NPR-1073 0.8X (focal length = 432, f/4.3, 3.24 arcsec/pix)
• Telescope mount: Orion Telescopes and Binoculars Atlas EQ-G Mount with GoTo Controller
• Tripod: Losmandy G-11 tripod
• Guide camera: Orion Telescopes and Binoculars StarShoot AutoGuider
• Guide scope: 40mm dia., 250mm focal length
• Guiding software: Stark Labs PHD Guiding

Imaging Processing

• AIP4WIN V2.2
• Diffraction Limited MaxIm DL V5.03
• Adobe Photoshop CS3 10.0.1

Monitor Test Pattern

The following test pattern is to help you adjust your monitor to best view the CCD astro images. The test pattern is used for adjusting monitor brightness, and contrast. Adjust monitor brightness and contrast to see all 16 gray scale levels. The most important adjustment when viewing astro images is to see the differences in all of the black bands.

© 1998-2008 David Haworth