Collection of Nebulae, Galaxies, and Solar System Objects Imaged from a Backyard Observatory

About the Images: Unlike planets, comets, and other solar system objects, deep sky objects are quite distant and faint. The closest nebulae are approximately 300-500 light years away, while the most distant galaxy shown in this collection is 25 million light years away. Such distances require very extended camera exposure times - on the order of hours. Total exposure times for some objects are in excess of 7 hrs with 3-4 hrs being typical.

About the Filters: Hydrogen alpha (Ha), doubly ionized oxygen (OIII) and ionized sulfur (SII) filters are used to record emission lines from fundamemntal elements that comprise the chemistry of our galaxy and beyond. Visible light from a narrow bandwidth (corresponding to a particular gas) is color mapped onto red (sulfur), green (hydrogen) and blue (oxygen) channels using the standard Hubble palette. In some cases, I used only the Ha filter (no color mapping). Narrowband filters effectively block the urban glow (street lamps, shopping malls, homes) and light reflected from the moon, significantly increasing S/N. Other images were obtained using conventional LRGB filters, with an Ha filter often used to enhance the hydrogen emission.

About the Equipment: These images were taken using a CCD camera from SBIG. The camera has two photosensitive chips (CCDs): a larger one to image the target object and a smaller one to lock on a nearby guide star for fine telescope position control to compensate for earth's rotation (over several hours). The camera body and filter wheel are attached a telescope and mounted on a sturdy German equatorial mount. All aspects of the imaging process (aiming, focus, guiding, filter selection, exposure time) are automatically controlled by a notebook computer.

 

NGC 4565
NGC 4565: 03.26.15
M81
comet Lovejoy
IC 444
Horsehead
M42
M81: 02.11.15
Comet Lovejoy: 02.10.15
IC 444: 12.26.14
IC 434: 11.25.14
M42: 11.19.14
Paetial Soalr Eclipse
Lunar Eclipse
Full Moon
DWB 111
M76
Partial Solar Eclipse: 10.24.14
Lunar Eclipse: 10.08.14
Full Moon 10.07.14
DWB 111: 09.30.14
M76: 09.14.14
IC1318
M15 - Globulr Cluster
M57-Ring nebula
M63 - Sunflower Galaxy
Lunar Eclipse
IC1318: Nebula Complex 08.15.14
M13: Globular Cluster 06.16.14

M57: Ring Nebula; 04.29.14

M63: Spiral Galaxy: 04.28.14
Lunar Eclipse: 04.15.14
M82 - Supernova 2014J
NGC 2264
M42
NGC 2359
NGC 2244
SN2014J in M82: 03.07.14
NGC 2264: 01.21.14
M42: 12.29.13
NGC 2359: 12.24.13
NGC 2244: 12.22.13
M1
ngc 1499
Comet ISON
NGC 896
IC 1871
M1: 11.25.13
NGC 1499: 11.6.13
Comet ISON: 11.14.13
NGC896: 10.07.13
IC 1871: 9.28.13
Melotte 15
Cygnus Wall
NGC 7635
M104
IC405
Melotte 15: 9.24.13
NGC 7000: 9.03.13
NGC 7635: 8.27.13
M104: 4.17.13
IC 405:2.11.13
M81
Sh2-232 HaRGB
Sh2-232 HaRGB
M42 - narrowband
IC 410
M81:1.14.13
IC434: 1.12.13
Sh2-232: 12.31.12
M42: 12.20.12
IC 410: 11.11.12
IC 417
Melotte 15
Full moon
IC 1396
IC 1396
IC 417: 11.05.12
Melotte 15: 09.24.12
Full Moon: 08.31.12
IC 1396: 08.07.12
NGC 7635: 08.18.12
Sh2-101: Tulip nebula
M82
M51
M101
Comet Garradd
SH2-101: 06.26.12
M82: 05.28.12
M51: 04.15.12
M101: 03.26.12
Comet Garradd: 03.20.12
NGC 2264: Cone Nebula
IC 2177
Horsehead
Abell 21
M42
NGC 2264: 01.25.12
IC 2177: 01.17.12
IC 434: 01.12.12
Abell 21: 12.23.11
M42: 12.20.11
NGC 2174
Sh2-216
NGC 281 -Packman
IC 1805
NGC 281 -Packman
NGC 2174: 12.3.11
Sh2-216: 11.24.11
Sh2-240: 11.21.11
IC 1805: 11.2.11
NGC 281: 11.1.11
M16 Ha
M27 Ha
IC 1570
M76: Little Dumbbell
NGC 1499
M16: 7.18.11
M27: 7.23.11
IC 5070: 8.1.11
M76: 10.11.11
NGC1499: 11.15.10
Sharpless 261 (Lower's Nebula)
Rosette: from Backyard
IC 410 from Backyard
IC 2162
NGC 7000
Sh2-261: 12.23.09
NGC 2244: 2.17.10
IC410: 11.24.09
IC 2162: 12.16.09
NGC 7000: 8.24.09
NGC 2264
IC443
NGC6960
M42
M51
NGC2264: 2.18.09
IC 443: 3.15.09
NGC 6960:7.11.09
M42:1.14.09
M51: 4.8.10