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: http://www.rochesterastronomy.org/SNIMAGES/reference/index.html
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Photometry Reference Images
On this web page you will find Photometry reference images. These images were generated by Odd Trondal from DSS images. Please use the comparison stars indicated for your magnitude estimates.
Messier Galaxies (complete)
| M31 | M32 | M33 | M49 | M51 | M58 | M59 | M60 | M61 | M63 | M64 | M65 | M66 | M74 |
| M77 | M81 | M82 | M83 | M84 | M85 | M86 | M87 | M88 | M89 | M90 | M91 | M94 | M95 |
| M96 | M98 | M99 | M100 | M101 | M102 | M104 | M105 | M106 | M108 | M109 | M110 |
NGC/IC galaxies
* Name uncertain
Uppsala galaxies
Other galaxy catalogs
Galaxy clusters
Large objects
| LMC (10'x10') | LMC (10'x10') | LMC (5'x5') | SMC (10'x10') | SMC (15'x15') |
| M31 NE Far | M31 NW Far | |||
| M31 NE | M31 North | M31 NW | M33 north | |
| M31 center | M33 center | |||
| M31 South | M31 SW | |||
| M31 South Far | M31 SW Far |
All of these images contain a "red" and a "blue" magnitude. These are used because supernovae change color, starting out very blue, and becomming red. Thus stars which are red will have a larger red magnitude than blue magnitude. It you are comparing the brightness of a new supernova, you should use the blue magnitudes. For an older supernova, use the red ones.
These images are done on the DSS image scale. Most Messier galaxies are done on a 2/3 scale, because the were large. The scale is as follows:
Full scale : 1.007" / pixel 2/3 scale : 1.51" / pixel
