NGC  2403      Galaxy          Click on photo to return to 'Galaxies'                                      Home
NGC2403

Dreyer description: Very remarkable! Considerably bright, extremely large, very moderately extended, very gradually much brighter middle nucleus.
Magnitude:  9.0
RA: 07h 36m 54.5s  Dec: +65°35'58"  (Epoch 2000)
Azm: 328°45'48"  Alt: +50°24'18"
Always above horizon.  Transit: 21:32
Size:22.0' x12.5'

SEDS description;
NGC 2403
Spiral Galaxy NGC 2403 (= H V.44), type Sc, in Camelopardalis
Right Ascension
7 : 36.9 (h:m)

Declination
+65 : 36 (deg:m)

Distance
12000.0 (kly)

Visual Brightness
8.4 (mag)

Apparent Dimension
17.8 x 11.0 (arc min)

Discovered by William Herschel in 1788.
This beautiful spiral galaxy is an outlying member of the M81 group of galaxies, and thus about 12 million light years distant.
NGC 2403 is among the more conspicuous Northern objects which Charles Messier missed when compiling his catalog. Thus its discovery was left to William Herschel.  One supernova has been recorded in this galaxy so far: Supernova 1954J, which was discovered by Zwicky (PASP 84, 844) on October 24, 1954. This supernova was situated 36E, 100N of the galaxy's nucleus and reached mag 16.0 in its maximum.

Photo Specifications:

      TELESCOPE:  8" Newtonian  F/5  (stopped down to 5.2 inches)
            CAMERA:  'SBIG' ST-8XE & CFW8 color filter wheel
CAMERA TEMP:  Temp. = -22 C
                   DATE:  2/19/07

Filter
Exposure time
Number of exposures
Binning
Luminance
20 min
4
1x1
Red
10 min
4
1x1
Green
10 min
4
1x1
Blue
16 min
4
1x1
Other









Processing:    MaxIm; align, color combine, DDP