Solar System
Milky Way
UGC 5829
"The Spider Galaxy"
New Images
The Spider Galaxy, UGC 5829 [A 1039+34/DDO 84/PGC 31923], is a low surface brightness, gas-rich
quiescent irregular dwarf  galaxy in Leo Minor.  It is located at  RA: 10h 42m 42s Dec: +34 26'56"(eq.
2000), approximately 26 million light years from Earth.  This object has been studied infrequently over
the years, with only 60 references listed by
Simbad through 2010.  It has rarely been imaged other than
as part of general surveys such as the Palomar Observatory Sky Survey (NGS-POSS) and
Sloan Digital
Sky Survey (SDSS).  As in the case of most deep images outside the plane of the Milky Way, in the field
of view there are numerous background objects.  These include galaxies such as
2MASXJ1041594+343147 and 2MASX J10425345+3419334; clusters of galaxies such as NSC
J104251+341738 (+- 1.5 billion light years); and Quasar SDSS J104220.43+342136.9 (+- 10 billion light
years) and Quasar Candidate USNO-A2.0 1200-06571136.  The annotated version has several of these
objects identified.

Image acquisition dates: March 4, 5, 6, 7, 8, 11  and April 5, 6, 8, 9, 10, 11, 2010.
Camera: SBIG STL6303E
Filters:  AstroDon LRGB
Camera control software:  CCDSoft
Guiding/adaptive optics: AO-L, STL internal guiding chip.
Camera temperature:  -20C and -10C
Image Acquisition Software:  CCDAP4
Telescope:  RCOS 16 Carbon Tube, Aries optics, F9 with Field Flattener
Telescope control software:  RCOS TCC, TheSky6, Focusmax
Mount:  Paramount ME (MKS 4000)
Total exposure time: 43  hours
Luminance: 18 hours [10 minute subexposures] unbinned
RGB: 8.5 hours each [10 minute subexposures] binned 2x2
Conditions: Seeing conditions ranged from 1.5 to 3 arc seconds.
FWHM of combined Luminance data: 2.6 arc sec.
Processing:  CCDStack2beta, Photoshop CS4. Due to its low surface brightness, the object required a
great deal of exposure time.  The need to collect data over a large number of nights resulted in much of
the data being collected during periods of soft seeing, and limited the aggressiveness of the processing.

Image appeared in October 2010 issue of
Astronomy Magazine.  
Click here for annotated version.
Click here for 1500x1000
Click here for 2250x1500