Ngc 3690

[hajuem]

Hallo:D

I had observed NGC 3690 (Arp 299)in June!
I watch with 16" f 4,5.
It`s a very interesting Object. The Galaxy ist 130 Mio LJ away, in the constellation Ursa Mayor.
The Galaxy is a pair of colliding galaxies. They involved in the collision. NGC 3690 B in the south and is the small one. IC 694 is in north of NGC 3690 A/B. I don`t have see IC 694!
781
The Hubble Foto
782
NGC 3690 (NGC project)
Visuale Magnitude: 11m6
Surface Brightness:12m7
My sketch from June 2013
783

180 - 240x SQM 21,42 Fst. 6m3
Allgäuer Alps, Kreuzleshöhe 1100m, Germany
784

How are your observations of this object??

P.S. Sorry for my bad english

Clear Sky from Germany

Hajü
www.astromerk.de

[Clear Skies]

Hi Hajü,

There seems to be some ambiguity about this Arp when it comes to the designation of IC694!
SIMBAD (http://simbad.u-strasbg.fr/simbad/sim-id?Ident=ic694&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id) and NED (http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=ic694&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES) agree on IC694 being the tiny round galaxy to the NW of NGC3690. Other sources, including Hyperleda (http://leda.univ-lyon1.fr/ledacat.cgi?IC0694&ob=ra) point to the SW of the two colliding galaxies and designate the detached tiny one as MCG+10-17-002A (PGC35325). I'm tempted to go with NED, and I'm sure the expertise on this forum will take away any confusion.

Anyway, I observed it on 4 May 2011 using a 12" SCT + 17mm Nagler. At the time of the observation my assumption was that IC694 was the SW merging galaxy:

NGC3690 and IC694 are visible, MCG+10-17-002A is not: An east to west elongated patch, brighter in an elongated central part, the SW part contains a nucleus (in IC694), the NE part does not (NGC3690). The western part is somewhat elongated from NE to SW, the eastern part is round (evident only when using averted vision).

[Ivan Maly]

Interesting object and observations. That is a really cool observing site photo!

[hajuem]

Hi
Thanks for your feedbacks!!
Viktor, that was a great observation with 12"!!! Thanks for your interesting Informations!

Lg Hajü
www.astromerk.de