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4/10/2017

Arp and Hickson Galaxy Observations of Late March 2017


I have been trying to space out my observing from the end of March. I guess I got in more than I thought, but not nearly as much as I wanted.  Besides working on Sue French's book (see the last post), I also worked on observing Arp and Hickson Galaxies and Groupings.  These were done at FR006 Juniper Grove observing location, with a SQM-L of 21.83 and Antoniadi II observing conditions.  My 17.5" dob Star Catcher f/4.4 was the telescope. A Paracorr Type II is used on all observations. North is down and west is to the left, or slightly tilted with North being slightly to the right corner and west slight off mid line down about 2/3's from the top left.


1. Arp 18 NGC 4088 Galaxy in Ursa Major. 22mm T4 Nagler; 5mm & 7mm Pentax XW. NGC 4088 is a long, flat spiral galaxy that has a bright inner core region and a stellar nucleus that is slightly off center.  There is lots of mottling around the core with hints of structure. One arm is easily seen and the other is detected with averted vision.  The tidal tail is observed and is very faint using averted vision and brealthing. Supernova SN 2009dd was in this galaxy in May of 2009. Fun object to observe!


2. Arp 23 or NGC 4618 (large spiral in the center) also known as the Magellanic Spiral (since it is similar to our dwarf companion galaxy the Magellanic Cloud in appearance) and NGC 4825 a small galaxy in the bottom right.  22mm T4 Nagler and 7mm & 10mm Pentax XW. NGC 4618 is a moderately sized and bright spiral galaxy with one distinct arm that is easily seen.  Mottling near a bright inner core is also view. I enjoyed observing this galaxy. NGC 4825 is an oval galaxy with a bright core but no structure evident. 


3. Arp 94 NGC 3226 an Elliptical Galaxy (smaller one below NGC 3227) and NGC 3227 a spiral galaxy in Leo.  22mm T4 Nagerl with 5mm, 7mm & 10mm Pentax XW.  NGC 3226 is a more round, though averted vision shape with a bright inner core region though it is moderate in size. It's compactness makes it rather bright.  NGC 3227 is FUN! More faint than NGC 3226 with mottling outside a bright inner core and both arems are visible.  Mottling in the arms is observed. Both galaxies are engaged with each other and with their outer halo there appears to be no separation. Well worth your time with the right aperture. 


4. Arp 269 or NGC 4490 The Cocoon Galaxy and NGC 4485 in Canes Venatici. 22mm T4 Nagler with 10mm & 7mm Pentax XW.  NGC 4490 is the larger of the two galaxies in the sketch and is somewhat large. The galaxy is bright with a brighter inner core. Spiral arms are S shape and present and visible. NGC 4485 is an even surface brightness galaxy, small in size, oval in shape. Nice pairing and worth the time to observe. Mottling evident in NGC 4490, lots going on within that galaxy. 


5. Arp 273 UGC 1810-13 interactive galaxies in Andromeda. This was observed on November 5th, 2016 and I did not add it in to that observation. FR006 Juniper Grove, Antoniadi I; 17.5 dob, 22mm Nagler T4 and 10mm & 7mm Pentax XW with Type II Paracorr.  
Faint pair of galalxies with spiral structure easily observed.  Best way to see that arms is to place the 8th magnitude star out of the FOV. In UGC 1810-13 the arms are observable at 321x with the 7mm Pentax XW.  Stellar cores on both. 


6. Hickson 40; MCG-01-25-009 or 40a; 010 or 40b; 008 or 40c; 012 or 40d; 011 or 40e (all last three digits are shown the actual galaxy is MCG-01-25-xxx with xxx the number I posted above. I will notify these by their Hickson number. 22mm T4 Nagler; 5mm & 10mm Pentax XW. 
40a is the large even brightness galaxy in the sketch and it is very faint, small and a roundish to oval shape galaxy.  It is the easiest to see in this group. 40c is the slanted galaxy above 40a and is elongated streak of light that I used averted vision to distinguish from 40a.  40b is the top most galaxy and is faint, small and round. Averted vision shows 40b distinct from 40c.  40d is very faint, is the galaxy down and to the right form 40a and is elongated east to west.  40e I want to say I caught glimpses of with the 5mm Pentax XW using averted vision and being very patient.  It would fade in and out.  22mm Nagler T4, 10mm Pentax XW; 7mm & 5mm Pentax XW. 


6. Hickson 44 in Leo.  NGC 3189 (brightest member in the middle) and is 44a; NGC 3193 or 44b is the elliptical down and to the right of 44a; NGC 3185 is 44c and is up and to the left of 44a; NGC 3187 is 44d and is in line and to the bottom left of 44a;  22mm T4 Nagler; 5mm, 7mm & 10mm Pentax XW;  
NGC 3193 is the elliptical and round galaxy to the lower right. It is round, and bright with a large bright inner core.  NGC 3189 is a large, bright and easily observed galaxy with a nice dust lane running through it that is easily seen.  NGC 3187 is faint but observable with direction vision and has no visible structure. NGC 3185 is easily seen, oval shape and has mottling through it. FUN GROUP! 


7. HIckson 57. 22mm Nagler T4; 10mm & 5mm Pentax XW; 
 NGC 3753 =57a and is the brightest galaxy in the center, being faint, elongated and small with a bright core region. NGC 3750 = 57c and is a companion just above 57a to the left and is a round, lumpy patch of light.  NGC 3754 = 57d is just off of NGC 3753, just below it on the NE end. It is just a very faint patch of light.  NGC 3746 is 57b and is the second brightest and largest galaxy here, down and to the right of 57a. 57b is faint, with even surface brightness with a bright inner core region. NGC 3745 = 57g and NGC 3748 = 57e are both barely visible with 57g just below 57b and 57e to the right of 57g, directly across from it.  You will need averted vision, aperture and experience to capture 57e and 57g. NGC 3751 = 57f is above 57a and is faint streak of light.


8. Hickson 58 in Leo. 22mm T4 Nagler, 10mm & 7mm Pentax XW. NGC 3820 is 58e and is the galaxy at the very bottom, center, and is compact, unfocused spot ; NGC 3822 is 58a and is in the center about 2/3 up and is the brightest galaxy here. It is oval, rather faint, small and somewhat elongated with a bright inner core. NGC 3825 is 58b located up and to the right of 58a and is faint with a bright inner core almost stellar; NGC 3817 is 58c and is located slightly down and to the left of 58a, and is a small, faint, and round galaxy with a bright inner core; NGC  3819 is 58d and is between 58a and 58e, and is very small and faint, round core with a stellar nucleus. 

I may need to retake this sketch as I zoomed in and did not adjust and cut parts of the star field off. 



9. Hickson 62 in Virgo. 22mm T4 Nagler; 10mm &5mm Pentax XW. NGC 4778 is 62a the brightest galaxy, largest with a bright inner core region but that is relevant as all these galaxies are small.  NGC 4776 is 62b and is right next to 62a down and to the left and is the second largest galaxy here.  It is faint and very small with a slight elongation with a bright inner core. NGC 4761 is 62c and is located down and to the right of 62a and is very small, faint and slightly elongated north to south.  NGC 4764 is 62d and is directly above 62a and is very, very faint and small and needs averted vision to locate. Once found, direct vision holds it about 2/3 of the time.  Good Hickson to test out your observing skills. 


10. Galaxy Trio 21; MCG-3-26-21; NGC 3128; NGC 3127 spiral galaxies in Hydra. 22mm T4 Nagler; 10mm Pentax XW, 14mm Pentax XW; NGC 3128 is the faint central galaxy laying almost north to south and has a bright inner core region with averted vision showing hints (?) of structure.  NGC 3127 lays west to east, directly to the right of NGC 3128 and has an even surface brightness.  MCG-3-26-21 is down to the bottom right of NGC 3128 and is faint, elongated almost west to east, and has a very bright inner core. 

Next up, some double stars I have been observing on the back porch here at home since the gibbous phase of the moon is providing some clear nights.