ASTRO: Arp 46

Arp 46 falls under Arp's category "Spiral Galaxies: Small, high surface
brightness companions on arms. The big spiral, UGC 12667, is not Arp
46. Arp 46 is the much smaller, distorted spiral down to the right
(southwest) of the bigger spiral. Arp 46 consists of UGC 12665, the
distorted spiral and its small companion VV 314b. Arp's comment:
"Companion connected to main spiral." I'm not all that convinced that
is correct. There is a nice tidal arm coming from VV 314b and
overlapping UGC 12665. But I see no way to tell if they are connected.
Most likely they aren't. But that tidal plum is nice in the 2x
enlargement.

The pair is in northern Pegasus. They are about 230 million light years
distant based on red shift and about 210 based on corrected Tully-Fisher
estimates. This is quite good agreememt as these things go. UGC 12665
is classed as SB(rs)d pec. Considering its northern arm is so distorted
to be unrecognizable I'd have to say the peculiar designation is well
earned. I find no classification of the companion. I'd say S0 pec as
drawing such a tidal arm is easier from most S0 galaxies than elliptical
galaxies.

This field is out of the Sloan survey area so there's not a lot of data
on the other galaxies in the field except for UGC 12667. The spiral is
Scd or Scd?. Redshift puts it at about 160 million light years so it
isn't related to Arp 46 at all.

The apparent distorted edge on spiral about 10 minutes to the northwest
(upper right) of Arp 46 is 2MASX J23330718+3010153. I find little on
it. The apparent edge on spiral (normal) directly north of the face on
spiral UGC 12667, near the top edge is 2MASX J23334841+3012482. These
two are the only other galaxies in the field that I could find any
catalog entry for in NED.

Arp's image:
http://nedwww.ipac.caltech.edu/level...big_arp46.jpeg

14" LX200R @ f/10, L=4x10', RGB=2x10'x3, STL-11000XM, Paramount ME

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

reminds me of a crab instalking food. Good image, impressed with the
reach of your equipment - must have some dry atmosphere there.

On Wed, 05 May 2010 13:57:44 -0500, Rick Johnson
wrote:

Arp 46 falls under Arp's category "Spiral Galaxies: Small, high surface
brightness companions on arms. The big spiral, UGC 12667, is not Arp
46. Arp 46 is the much smaller, distorted spiral down to the right
(southwest) of the bigger spiral. Arp 46 consists of UGC 12665, the
distorted spiral and its small companion VV 314b. Arp's comment:
"Companion connected to main spiral." I'm not all that convinced that
is correct. There is a nice tidal arm coming from VV 314b and
overlapping UGC 12665. But I see no way to tell if they are connected.
Most likely they aren't. But that tidal plum is nice in the 2x
enlargement.

The pair is in northern Pegasus. They are about 230 million light years
distant based on red shift and about 210 based on corrected Tully-Fisher
estimates. This is quite good agreememt as these things go. UGC 12665
is classed as SB(rs)d pec. Considering its northern arm is so distorted
to be unrecognizable I'd have to say the peculiar designation is well
earned. I find no classification of the companion. I'd say S0 pec as
drawing such a tidal arm is easier from most S0 galaxies than elliptical
galaxies.

This field is out of the Sloan survey area so there's not a lot of data
on the other galaxies in the field except for UGC 12667. The spiral is
Scd or Scd?. Redshift puts it at about 160 million light years so it
isn't related to Arp 46 at all.

The apparent distorted edge on spiral about 10 minutes to the northwest
(upper right) of Arp 46 is 2MASX J23330718+3010153. I find little on
it. The apparent edge on spiral (normal) directly north of the face on
spiral UGC 12667, near the top edge is 2MASX J23334841+3012482. These
two are the only other galaxies in the field that I could find any
catalog entry for in NED.

Arp's image:
http://nedwww.ipac.caltech.edu/level...big_arp46.jpeg

14" LX200R @ f/10, L=4x10', RGB=2x10'x3, STL-11000XM, Paramount ME

Rick

Just the opposite. I live right on the lake shore where humidity is
usually above 90% winter and summer. This was taken in August when
humidity runs 95% or higher. I have several cylinders of water catchers
in the mostly closed optical train. They keep things dry enough that I
don't fog over the optical window. I change them once a month. I can't
image well at all below the equator with -15 the limit except for rare
nights as no ligh gets through. visually Antares is a faint red light
with binoculars needed to see most of the rest of the constellation
that's above the horizon. Zenith is good most nights but as I go lower
things go bad fast. Makes color balance a nightmare as it never is the
same. I have to find some G2V or close stars in the area of the object
when this happens and take a quick RGB of it to set my color levels.
Even then I often get results in color balance I'm not happy with.
Normally I shoot to 22nd magnitude. This shot only reaches 21.5. On
those rare dry nights I can hit 24.5 in 40 minutes. So at this
declination, +12, the humidity cost me about 3 magnitudes the night I
took this shot. I don't log relative humidity so can't tell you what it
was this night but likely over 95% I have to have the aperture to
compensate!

Rik


On 5/6/2010 12:38 AM, Glen Youman wrote:
reminds me of a crab instalking food. Good image, impressed with the
reach of your equipment - must have some dry atmosphere there.

On Wed, 05 May 2010 13:57:44 -0500, Rick
wrote:

Arp 46 falls under Arp's category "Spiral Galaxies: Small, high surface
brightness companions on arms. The big spiral, UGC 12667, is not Arp
46. Arp 46 is the much smaller, distorted spiral down to the right
(southwest) of the bigger spiral. Arp 46 consists of UGC 12665, the
distorted spiral and its small companion VV 314b. Arp's comment:
"Companion connected to main spiral." I'm not all that convinced that
is correct. There is a nice tidal arm coming from VV 314b and
overlapping UGC 12665. But I see no way to tell if they are connected.
Most likely they aren't. But that tidal plum is nice in the 2x
enlargement.

The pair is in northern Pegasus. They are about 230 million light years
distant based on red shift and about 210 based on corrected Tully-Fisher
estimates. This is quite good agreememt as these things go. UGC 12665
is classed as SB(rs)d pec. Considering its northern arm is so distorted
to be unrecognizable I'd have to say the peculiar designation is well
earned. I find no classification of the companion. I'd say S0 pec as
drawing such a tidal arm is easier from most S0 galaxies than elliptical
galaxies.

This field is out of the Sloan survey area so there's not a lot of data
on the other galaxies in the field except for UGC 12667. The spiral is
Scd or Scd?. Redshift puts it at about 160 million light years so it
isn't related to Arp 46 at all.

The apparent distorted edge on spiral about 10 minutes to the northwest
(upper right) of Arp 46 is 2MASX J23330718+3010153. I find little on
it. The apparent edge on spiral (normal) directly north of the face on
spiral UGC 12667, near the top edge is 2MASX J23334841+3012482. These
two are the only other galaxies in the field that I could find any
catalog entry for in NED.

Arp's image:
http://nedwww.ipac.caltech.edu/level...big_arp46.jpeg

14" LX200R @ f/10, L=4x10', RGB=2x10'x3, STL-11000XM, Paramount ME

Rick


--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".