Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Astrophotography and Sketching >> Sketching

Pages: 1
cildarithModerator
Carpal Tunnel
*****

Reged: 08/26/04

Loc: San Diego, CA
NGC 4038/9
      #4576160 - 05/11/11 08:57 PM Attachment (42 downloads)

Object Name: NGC 4038/9
Also Known As: H.IV.28, Arp 244, the Antennae, Ring Tail Galaxies
Object Type: Interacting Galaxy Pair
Constellation: Corvus
Right Ascension (2000.0): 12h 01m 53.2s
Declination (2000.0): –18° 52' 38"
Magnitude: 10.7
Dimensions: 4.5' x 3.6'
Hubble Class: S?/pec
Distance: 63 million light years
Discovery: William Herschel on 7 February 1785 with 18.7-inch reflector
NGC Description: 4038 - pB, cL, R, vgbM; 4039 - pF, pL

Telescope: Parks Astrolight EQ6 • 6" f/6 Newtonian Reflector
Eyepiece/Magnification: 7.5mm Parks Gold Series Plössl • 120x • 26' Field of View
Filter: None
Date/Time: 30 April 2011 • 04:15-05:00 UT
Observing Location: Oakzanita Springs, Descanso, San Diego Co., California, USA
Transparency: NELM 6.2; TLM 14.2
Seeing: Pickering 7-8
Conditions: Clear, calm, cold, humid

This interacting galaxy pair is best located about 50 arc minutes NNE of the fifth magnitude star HD 104337, the brightest star on the western border of Corvus. While you are in the area you might do well to look for NGC 4027 30' NW of HD 104337 and NGC 3981 68' WSW of that star. The Antennae would be a challenging target for binocular observers.

At 30x magnification, this galaxy pair appears as a soft asymmetric patch of nebulosity, larger and brighter toward the north, smaller and fainter toward the south, but with no other details readily visible. Another soft, featureless patch of nebulosity may be glimpsed in the same field of view, 42' away to the SW; this is NGC 4027, an 11th magnitude barred spiral galaxy and a fine target in its own right.

At 60x magnification, the Antennae or Ringtail galaxies are clearly resolved as two separate (though attached) objects. Together they look like a lopsided heart or a bloated "V", with occasional glimpses of mottling across the face of the nebulosity. At 120x magnification the western rim (shaped like a backward "S") of the pair is clearly brighter and more distinct than the rest of the object. During moments of good seeing this bright rim breaks into several distinct knots. The central region of NGC 4038 appears almost hollow by comparison; perhaps this is why Herschel catalogued this object as a planetary nebula. Averted vision revealed occasional glimpses of the base of the southern tail.

At 120x magnification NGC 4038 and NGC 4039 share the 26' field of view with 9th-magnitude TYC 6097-326-1, white, about 6.5' NW, 10th-magnitude TYC 6097-415-1, orange-red, about 9.5' S, 11th-magnitude TYC 6097-619-1, yellow-white, about 10.8' NE, 11th-magnitude TYC 6097-288-1, yellow-orange, about 13' NNW, and 11th-magnitude TYC 6097-629-1, yellow, about 12.5' NW. The remaining field stars are in the 12-14 magnitude range.

The sketch presented here depicts the view at high magnification (120x). The sketch has been rotated so that north is up and west is to the right. The sketch was executed with a No. 2 mechanical pencil with 0.5 mm lead, and two blending stumps (8948B, 8941B) on 100 lb. white card stock. The original drawing measures 7˝ inches across.

This observation was made from a reasonably dark site (borderline blue-green on LP maps) at an elevation above 4,000 feet. The NELM was estimated at 6.2, the TLM at 14.2 in the vicinity of the target. The seeing conditions were above average (Pickering 7-8), but the humidity was quite high and care had to be taken to prevent dew from accumulating on optics and sketching materials. The temperature was 37°F. The air was very still and the high magnification views very steady.


Post Extras: Print Post   Remind Me!   Notify Moderator  
JakeSaloranta
Pooh-Bah


Reged: 09/18/08

Loc: Finlandia
Re: NGC 4038/9 new [Re: cildarith]
      #4576678 - 05/12/11 04:50 AM

Diggin' it!

/Jake


Post Extras: Print Post   Remind Me!   Notify Moderator  
nitsky
sage


Reged: 03/15/10

Loc: Cologne,New jersey
Re: NGC 4038/9 new [Re: JakeSaloranta]
      #4576734 - 05/12/11 06:37 AM

Great sketching work Eric, thankyou!
Clearskys always,
Dave


Post Extras: Print Post   Remind Me!   Notify Moderator  
Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: NGC 4038/9 new [Re: nitsky]
      #4576738 - 05/12/11 06:45 AM

Congratulations with your ASOD!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Mizar76
member


Reged: 01/07/11

Loc: Rome, Italy
Re: NGC 4038/9 new [Re: Jef De Wit]
      #4576792 - 05/12/11 07:37 AM



I have no words.....


Post Extras: Print Post   Remind Me!   Notify Moderator  
cildarithModerator
Carpal Tunnel
*****

Reged: 08/26/04

Loc: San Diego, CA
Re: NGC 4038/9 new [Re: Mizar76]
      #4577064 - 05/12/11 10:38 AM

Thanks Jake, Dave, Jef and Mizar76!

Post Extras: Print Post   Remind Me!   Notify Moderator  
niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: NGC 4038/9 new [Re: cildarith]
      #4577069 - 05/12/11 10:40 AM

Eric,

Very good sketch of NGC 4038/9 .

CS,KLU,

,

Tom


Post Extras: Print Post   Remind Me!   Notify Moderator  
cildarithModerator
Carpal Tunnel
*****

Reged: 08/26/04

Loc: San Diego, CA
Re: NGC 4038/9 new [Re: niteskystargazer]
      #4577488 - 05/12/11 02:29 PM

Thanks Tom!

Post Extras: Print Post   Remind Me!   Notify Moderator  
JayKSC
Carpal Tunnel
*****

Reged: 01/01/05

Loc: Florida
Re: NGC 4038/9 new [Re: cildarith]
      #4578067 - 05/12/11 08:02 PM

Eric,

Once more I am impressed with your skill at rendering these dimmer targets. I find it very challenging to scan my own sketches and get the brightness/contrast to work out quite right. You've definitely mastered this. At first I didn't notice the galaxy duo in your sketch (my monitor brightness is set a bit low, though). Then, on a closer look I saw the interacting pair loom out of the background - almost as if viewing through a scope. Great work and great write-up!

- Jay
South Florida


Post Extras: Print Post   Remind Me!   Notify Moderator  
cildarithModerator
Carpal Tunnel
*****

Reged: 08/26/04

Loc: San Diego, CA
Re: NGC 4038/9 new [Re: JayKSC]
      #4578453 - 05/13/11 12:01 AM

Thanks for your comments, Jay!

Post Extras: Print Post   Remind Me!   Notify Moderator  
frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: NGC 4038/9 new [Re: cildarith]
      #4580343 - 05/13/11 09:04 PM

Eric,

Always fun to see what you are sketching in the southern Cal. desert.
Very impressive work including the write up.

Frank


Post Extras: Print Post   Remind Me!   Notify Moderator  
cildarithModerator
Carpal Tunnel
*****

Reged: 08/26/04

Loc: San Diego, CA
Re: NGC 4038/9 new [Re: frank5817]
      #4581112 - 05/14/11 10:33 AM

Thanks Frank!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
1 registered and 1 anonymous users are browsing this forum.

Moderator:  cildarith, JayinUT, WOBentley 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 953

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics