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Re: (IAAC) Obj: Hickson 50, Abell 2065, M104, M13, many others - Inst: 82" f13.1 cass. focus
Paul,
I just want to add something about Hickson 50 (Shk 5). The magnitudes given
in the Hickson catalog are blue magnitudes. The visual appearance is
brighter
(nearly two magnitudes). I was able to see H 50 A in my 20incher under
6,5mag skies. A buddy of mine managed to see three members of this elusive
group using a 20incher under better skies than I had. Another guy here in
germany was able to see H 50 A even in a 18incher under 7,0mag skies.
The red magnitudes are much brighter than the blue magnitudes and even
brighter than the visual magnitudes. The red part of the spectrum is the
strongest (lots of red stars in these galaxies). For example: H 50 A has a
16,2 mag red and 18,4 mag blue magnitude.
always clear skies and best regards from germany, Jens
-----Ursprüngliche Nachricht-----
Von: anonymous NFS user <nobody@web.tiac.net>
An: Internet Amateur Astronomers Catalog <netastrocatalog@jovian.com>
Datum: Mittwoch, 10. Mai 2000 01:48
Betreff: (IAAC) Obj: Hickson 50, Abell 2065, M104, M13, many others - Inst:
82" f13.1 cass. focus
>----
>
>Observer: Paul Alsing
>Your skills: Intermediate (some years)
>Date/time of observation: 5/2/00
>Location of site: Mc Donald Observatory, near Ft. Davis, Texas (Lat 31 N,
Elev 6700)
>Site classification: Rural
>Sky darkness: 9 <1-10 Scale (10 best)>
>Seeing: 9 <1-10 Seeing Scale (10 best)>
>Moon presence: None - moon not in sky
>Instrument: 82" f13.1 cass. focus
>Magnification: 847
>Filter(s): none
>Object(s): Hickson 50, Abell 2065, M104, M13, many others
>Category: Other.
>Class:
>Constellation: many
>Data: mag size
>Position: RA : DEC :
>Description:
>I had the great opportunity, along with 27 others, of spending an entire
night,
>dusk 'till dawn, at the eyepiece of the 82" telescope at the McDonald
>Observatory near Ft. Davis, Tx, during the week of the Texas Star Party.
Rather
>than submit a separate observation for each object, I thought I would share
a
>narration of the highlights.
>
>We started off by splitting Castor, to evaluate the nights' seeing. In the
>5 minute field of view it looked as though we could have driven a bus
between
>the components. I would estimate that we easily had sub-arcsecond seeing.
>
>Next on the list was the Ghost of Jupiter Planetary. This object completely
>filled the field of view. The inside was comprised of several overlapping
>crepe rings of a pastel blue-green color. I know they were overlapping
because
>the color was much more intense at those overlaps, and the delineation was
razor
>sharp. Around the outside of the nebula was a ring that I can only describe
as
>a race track, a wide oval with well defined edges, but with the color now
being
>a brilliant rose hue. The most colorful object of the entire night.
>
>Several observers requested that the galaxy group Hickson 50 be on the
night's
>list because it is the faintest of all Hickson's, and will probably never
be
>seen by the vast majority of amateurs. Even in the 82" it was not
impressive.
>I personally saw 3, maybe 4 galaxies, but all were very faint. But good
enough
>to log on my Hickson list! The brightest of the group is mag. 18.4, and
there
>are a total of 5 in the group.
>
>For the same reason, I asked to look at the Corona Borealis galaxy cluster,
Abell 2065,
>because of the faintness of it's members. With over 200 members in the
cluster,
>our tiny 5 arcminute field yielded somewhere between 6 and 8 galaxies to my
old
>eyes, although I must add that most people only saw 3 or 4. The brightest
in
>this cluster is a whopping 16.5!
>
>We also looked at some of the more popular objects in the sky. M104 was
staggering, even though it spans about 16 arcseconds. We could only look at
the
>middle third, but that was enough. The dust lane through M104 looked as if
>someone had carefully removed part of the galaxy with a razor blade, the
edges
>were that clean. What also impressed me was that in real-time, with the
large
>aperture, the smaller portion of that galaxy is really small, compared to
how it looks on photographs.
>
>NGC 4565 was much the same, with only the central bulge and most of one
side
>only being able to fit into the field. But in this case, the prominent
>dust lane clearly had a very turbulent edge, with lots of swirls and whorls
>evident all along it's length.
>
>I have more, but I will need to refer to my notes to do them justice, and
my notes are not with me now. Another time.
>
>
>
>
>
>--
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