NGC 7549 - Arp 99 Galaxy Group in Pegasus. (astroeyes)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7547 · NGC 7549 · NGC 7550 · NGC 7553 · NGC 7558

NGC 7549 - Arp 99 Galaxy Group in Pegasus., astroeyes

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NGC 7549 - Arp 99 Galaxy Group in Pegasus.

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NGC 7549 - Arp 99 Galaxy Group in Pegasus.

An image acquired in September that I finally got around to processing.

Arp 99, the ngc 7549 galaxy group in Pegasus, showing a nice small group of

faint galaxies.

NGC 7549 is the large 2 armed barred SBm spiral, magnitude 14.1 and size 2.8' x

0.7'. It forms an interacting system with ngc 7550 (elliptical mag.14.1) and ngc

7547 (SBa mag. 14.9).

Others in the frame include ngc 7558 (Sa mag. 15.8) and UCM 2313+1842 (no data).

Around 100 minutes total exposure, made up of 2 and 3 minute subs sigma combined

in AA3. Guided with PHD through my little KWIQ guider. Imaged through the 10"

f4.8 Newt. I have to say some of Halton Arp's classifications confuse me. He was interested not only

in interactions between galaxies but also between galaxy groups.

Arp 99 is in the class Spirals with Elliptical Galaxy Companions on Arms. Dr.

Arp provided some fairly extensive notes on this group, saying "connection not

seen, but note difference in arms toward and away from E galaxy. Note also

material between West spiral and E galaxy".

I include a negative image of a cropped section from my image which, I hope,

shows what he was looking for. Whether there is any connection between the

elliptical and the spiral I can't say but there is some difference in symmetry

between the 2 arms of the spiral.

Original
Final
B
C

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Status	Basic success
Started	...
Astrometry.net job	6696381
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 7549 - Arp 99 Galaxy Group in Pegasus.

NGC 7549 - Arp 99 Galaxy Group in Pegasus.

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NGC 7549 - Arp 99 Galaxy Group in Pegasus.

NGC 7549 - Arp 99 Galaxy Group in Pegasus.

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