Clear Skies
May 24th, 2013, 05:05 PM
Hi all,
After the stellar dot determined to be a star superimposed over M101 (http://www.deepskyforum.com/showthread.php?374-Star-cluster-in-Messier-101), here's another one I would like to throw into the group.
Galaxy NGC5669 in Boötes.
674
Caught it in the early morning of 13 April, 12" SCT + 17mm Nagler. In this (modest, on this forum) telescope the galaxy showed some irregular structure, no clear arms. The central, NE-SW elongated part was obvious.
Immediately to the SSW (almost due south) of the central part of the galaxy I noticed a tiny, very faint stellar dot, popping into view only when using AV. Not unlike a mag. 15 star, which is the limit for my scope under dark skies with good dark adaptation.
Now... is this a star or perhaps a feature in the galaxy itself? Contrary to the M101 dot I posted about last week, this lil' dot almost vanishes in IR (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_ir&r=14+32+43.48&d=%2B09+53+25.5&e=J2000&h=15.0&w=15.0&f=gif&c=none&fov=NONE&v3=), but does reveal itself in DSS POSS2 Blue (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_blue&r=14+32+43.48&d=%2B09+53+25.5&e=J2000&h=30.0&w=30.0&f=gif&c=none&fov=NONE&v3=) and Red (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_red&r=14+32+43.48&d=%2B09+53+25.5&e=J2000&h=15.0&w=15.0&f=gif&c=none&fov=NONE&v3=).
The exact position is 14:32:43.95 +09d53m21s, 0.5 arcminute DSS image here (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_blue&r=14+32+43.95&d=%2B09+53+21.0&e=J2000&h=0.5&w=0.5&f=gif&c=none&fov=NONE&v3=).
NED (http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Near+Position+Search&in_csys=Equatorial&in_equinox=J2000.0&lon=14%3A32%3A43.95&lat=%2B09d53m21s&radius=1&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&z_constraint=Unconstrained&z_value1=&z_value2=&z_unit=z&ot_include=ANY&nmp_op=ANY&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=Distance+to+search+center&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES) is not helpful, nor is SIMBAD.
Any large scope observations?
Cheers,
Victor
EDIT: Or perhaps SN 2013AB (http://www.rochesterastronomy.org/sn2013/sn2013ab.html) ?
After the stellar dot determined to be a star superimposed over M101 (http://www.deepskyforum.com/showthread.php?374-Star-cluster-in-Messier-101), here's another one I would like to throw into the group.
Galaxy NGC5669 in Boötes.
674
Caught it in the early morning of 13 April, 12" SCT + 17mm Nagler. In this (modest, on this forum) telescope the galaxy showed some irregular structure, no clear arms. The central, NE-SW elongated part was obvious.
Immediately to the SSW (almost due south) of the central part of the galaxy I noticed a tiny, very faint stellar dot, popping into view only when using AV. Not unlike a mag. 15 star, which is the limit for my scope under dark skies with good dark adaptation.
Now... is this a star or perhaps a feature in the galaxy itself? Contrary to the M101 dot I posted about last week, this lil' dot almost vanishes in IR (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_ir&r=14+32+43.48&d=%2B09+53+25.5&e=J2000&h=15.0&w=15.0&f=gif&c=none&fov=NONE&v3=), but does reveal itself in DSS POSS2 Blue (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_blue&r=14+32+43.48&d=%2B09+53+25.5&e=J2000&h=30.0&w=30.0&f=gif&c=none&fov=NONE&v3=) and Red (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_red&r=14+32+43.48&d=%2B09+53+25.5&e=J2000&h=15.0&w=15.0&f=gif&c=none&fov=NONE&v3=).
The exact position is 14:32:43.95 +09d53m21s, 0.5 arcminute DSS image here (http://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_blue&r=14+32+43.95&d=%2B09+53+21.0&e=J2000&h=0.5&w=0.5&f=gif&c=none&fov=NONE&v3=).
NED (http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Near+Position+Search&in_csys=Equatorial&in_equinox=J2000.0&lon=14%3A32%3A43.95&lat=%2B09d53m21s&radius=1&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&z_constraint=Unconstrained&z_value1=&z_value2=&z_unit=z&ot_include=ANY&nmp_op=ANY&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=Distance+to+search+center&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES) is not helpful, nor is SIMBAD.
Any large scope observations?
Cheers,
Victor
EDIT: Or perhaps SN 2013AB (http://www.rochesterastronomy.org/sn2013/sn2013ab.html) ?