Astronomy

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11. This two-panel mosaic shows the
    well-known Whirlpool Galaxy (M51a or
    NGC 5194) and its companion (M51b or NGC

5195. at the top, with the rarely imaged
      NGC 5198 south of the pair. Mark took this
      photo using a PlaneWave 17-inch f/6.7 on
      a PlaneWave Ascension 200HR German
      Equatorial Mount, with an SBIG STX 16803
      camera. The Hα/LRGB image has exposures
      of 7, 16.7, 5, 5, and 5 hours, respectively,
      for M51, and LRGB exposures of 7.5, 4, 4,
      and 4 hours, respectively, for NGC 5198.

12. This exceptionally deep color

view of the Cocoon Nebula (IC 5146)

traces tantalizing features within and

surrounding the dusty stellar nursery.

It was taken with a 20-inch Officina

Stellare Pro RC telescope on a Paramount

ME II Mount.

13. NGC 2023 in Orion is an emission and
    reflection nebula. In this image, Mark and
    his colleagues bring it out of “the shadow
    of the Horsehead” using an FLI 16803
    camera on a 16-inch RCOS telescope and
    PlaneWave Ascension 200HR German
    Equatorial Mount.

14. Spiral galaxy NGC 4151 in Canes

Venatici hosts one of the brightest

active galactic nuclei known at X-ray

wavelengths. The small spiral galaxy

visible to the bottom right of NGC 4151

is NGC 4156. Mark captured them with

a PlaneWave 24-inch f/6.7 telescope on

a PlaneWave Ascension 200HR German

Equatorial Mount, using an SBIG STX 16803

camera. His LGRB image has exposures of

7.5, 4, 4, and 4 hours, respectively.

15. Near the Crescent Nebula lies PN
    G75.5+1.7, also called the Soap Bubble
    Nebula. Mark captured it with a PlaneWave
    24-inch f/6.7 telescope, using an SBIG
    16803 camera. This Hα/OIII/LRGB image
    contains exposures of 10.5, 12, 3.5, 3.5,
    3.5, and 3.5 hours, respectively.


16. As one of the more dynamic and
    colorful areas in the southern sky, this
    beautiful star-forming region in the
    constellation Corona Australis has much
    to offer. This image was taken using an FLI
    16803 camera on a 16-inch RCOS telescope
    with a PlaneWave Ascension 200HR
    German Equatorial Mount. It is an LGRB
    image with exposures of 21, 14.5, 13.5,
    and 13.5 hours, respectively.


17. NGC 3718 is an interesting galaxy
    with a warped structure; NGC 3729 is
    the smaller spiral galaxy in this image,
    showing remarkable detail as well. Mark
    shot the pair over two nights with excellent
    transparency and seeing, using a 14.5-inch
    RCOS f/8 telescope and an Apogee Alta
    U16M camera running at –31 F (–35 C). He
    spent several weeks processing this deep
    LGRB image, which contains exposures of
    8, 4.3, 3.3, and 4.3 hours, respectively.


18. IC 10 is a starburst galaxy within
    the northern constellation Cassiopeia.
    Mark took this image using a 20-inch
    Officina Stellare Pro RC telescope and
    an Apogee Alta U16M camera.

MARK HANSON, S.

MAZLIN, W. KELLER, R.

PARKER, T. TSE,

P. P

ROULX, D.

PLESKO; SSRO/

PRO

MP

T/CTIO

TY Coronae

Australis

HH 98

R Coronae Australis

HH 99

HH 733

NGC 6726 -7

SL 41

HD 17 6269

IC 481 2

HS 17 6270

Bernes 157

HH 8 2

HH 735

HH 104

HD 17 6386

S Coronae Australis

HH 97

HH 100

HH 101

NGC 6729

T Coronae Australis

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17 18

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