IC1613 - Local Group Galaxy

With Asteroid 1998 FV67

Irregular Galaxy in Cetus

Uploaded 12/4/05

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 This extremely faint galaxy is highly asymmetrical in appearance. The entire galaxy fills the short dimension of this frame, yet the brightest area is above center. Its always an amusing surprise when objects don't appear as plotted on the atlas! IC1613 is a 10th magnitude integrated brightness spread out over a quarter degree of sky. So faint is this object that I had to do a 1 minute exposure just to see if it was even there in the framing shot. Most star images in this IB(s)m galaxy are 18 - 20th magnitude. Another unexpected bonus was the proliferation of gold and blue supergiant stars across the entire galaxy, the gold stars particularly evident on the lower left edge of the galaxy. Some very nice HII regions appear on the upper left quadrant. One is a large ring shape embedded within an association of many hot blue O/B stars.

There are some additional objects in this field worth noting. Inside the galaxy itself are four faint anonymous galaxies which of course are far behind this Local Group denizen. The brightest and easiest to see is an edge on on the lower left edge of the main glow, just below a bright star. This is MAC0105+0204, and unknown class 17th magnitude probable spiral type. there is another, just to the right of the core inside the bright glow, a 17th mag object as well, MAC014+0207.

And of course lets not forget the Asteroid 1998 FV67, a newly discovered member of our solar system in 1998, which is currently at 19.3 magnitude. It is the trail of colored dots on the lower right part of the image. This is because it moved between color frames and you can see the repeated sequence of RGBRGB as the object moved. So the top is the start of the exposure, since it is the red dot.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Cooling Guider: SBIG ST4 Exposure: LRGB = 120:20:20:20 (RGB Binned 2x2) RGB Combine Ratio: 1: 1.05: 1.11 (G2V) Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 5.0 arcsec (Maxim DL - 10min subframe), Transparency 7/10 Outside Temperature: 35 F CCD Temperature: -30 C Processing Tools: Maxim DL, Photoshop, PixInsight, CCDOps Debloomer. HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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