British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Gallery Picture of the Week
Image search

Comet Garradd and M71 by Dennis Boon

Image

Expand image

About this observation
Observer
Dennis Boon
Time of observation
04/09/2011 - 11:45
Like This Image
 0  
Share

BAA member Dennis Boon captured this image of comet Garrad passing Messier 71 on20110826 at BST 22.10. Dennis used an RC10 telescope and aCanon 500D digital camera -2minute exposure at ISO 1600. You can see other Garrad images, including an excellent shot of the comet passing the "Coathanger" (Colliner 399) in the Comet Gallery.

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.
BAA Gallery
Image search

Comet 2009P1 Garradd

Image

Expand image

About this observation
Observer
Time of observation
02/09/2011 - 11:04
Like This Image
 0  
Share
ccd image and observation
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.
BAA Articles

Comet Garradd sweeps past the Coathanger

As Comet Garradd makes its lazy sweep across the night sky, after last weeks close encounter with M71, this week the comet will cross just under the popular asterism known as the Coathanger. Also known as Brocchi’s Cluster and catalogued as Collinder 399 – today, though, it is generally recognised to be just an asterism, a chance collection of stars making up a pattern, rather than a true cluster of stars that were created at much the same time.

The Coathanger also has a special place in the heart of the BAA, as one of the Association’s most active observers, George Alcock, discovered a nova there in 1976.

This chart shows the comets path over the next few days.

This comet is easy with 10×50 binoculars, and is straightforward to find by locating the lovely double star Albireo (Beta Cygni), then hang down south and you will come to the Coathanger, and just under the Coathanger will be found comet Garradd.

If you manage to capture an image of this, please send it in for our picture of the week spot.

Like This Article
 0  
BAA Gallery
Image search

C/2011L3 McNaught

Image

Expand image

About this observation
Observer
Time of observation
01/09/2011 - 09:46
Like This Image
 0  
Share
ccd image and observation
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.
BAA Gallery
Image search

C/2011L3 McNaught

Image

Expand image

About this observation
Observer
Time of observation
01/09/2011 - 09:46
Like This Image
 0  
Share
ccd image and observation
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.
BAA Gallery Lunar
Image search

Eratosthenes - Sketch by Sally Russell

Image

Expand image

About this observation
Observer
Sally Russell
Time of observation
31/08/2011 - 12:08
Tags
Like This Image
Share

Sketch of Eratosthenes as seen on the terminator. Sketch was made with white pastel and Conte crayon on black Canford paper, using a 105mm F6 refractor at 140x (binoviewers).

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.
BAA Gallery Picture of the Week
Image search

SN 2011fe in M101 by Loyd Overcash

Image

Expand image

About this observation
Observer
Loyd Overcash
Time of observation
31/08/2011 - 11:15
Like This Image
 0  
Share

Loyd Overcash is a member of the Houston Astronomical Society, with an observatory in Fort Davis, west Texas, USA. He took this image of supernova SN2011fe on 28th August using a 16 inch RCOS telescope operating at f/9 and an SBIG STL-6303 camera. This image is a stack of 6 x 5 minutes exposures in Luminance, Red, Green and Blue. The image is reproduced here with his permission

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.
BAA Articles

Supernova in M101

The Palomar Transient Factory (PTF) discovered a supernova in M101 on August 24th. At magnitude 17.2 it was pretty faint, but as this supernova was discovered ‘on the rise’ it has been steadily brightening, and may reach mag. 10 or 11 – making it easily visible in binoculars or a small telescope.

Image of supernova PTF11kly in M101 by BAA Member Denis Buczyski

Although M101 is in the circumpolar constellation of Ursa Major, and so will never set from UK locations, it does not attain a very high altitude, and will be best placed for observation as soon as the sky becomes dark.

The observations of supernovae are important, because they are a key component of the distance ladder. This is a series of stepping stone techniques used to measure distances to far-off galaxies. It is thought that type Ia supernovae explode with much the same brightness due to the physical nature of the star, so finding a supernova relatively close-by helps our understanding of the physics of the explosion, and further help the calibration of the distance scale.

Amateur astronomers can best contribute to the science by measuring the brightness of the supernova, and contribute to it’s light curve.

But there is also a great pleasure in seeing for yourself one of the greatest cosmic events, which happened 23 million years ago and the light of the event has just reached us.

Like This Article
 0  
BAA Articles

Close encounter between Messier 71 and comet Garradd C/2009 P1

Over the next few nights the comet C/2009 P1 Garradd makes a close pass by of Messier object 71 in the constellation of Sagitta (the arrow). Close encounters between different classes of astronomical object are always of interest, both for the visual observer and the astronomical imager.

This chart shows the position of the comet and M71 in Sagitta around 22:30UT on August 26 2011.

Stewart Moore, director of the BAA Deep Sky Section writes:

M71 is a very loose globular which is close to us and lacks the condensed core of some of the more familiar summer globulars. In small binoculars or telescopes it appears as a mag 8 misty patch around 6 arcmin diameter and looking very comet like in appearance.  It is easy to locate as it lies in Sagitta between and slightly south of a line from mag 3.5 gamma (the bright star forming the point of the arrow shape) and mag 3.8 delta just under 3 degree to the west. The position of M71 is RA 19h 54m 19s and Dec +18deg 49min (2000).

An ephemeris for Garradd can be found on the BAA Comet Section web page but for the night of August 26 / 27 is given as 19h 53.7m and Dec +18.57deg (2000)

On Aug 24 / 25 under mag 5 skies both comet and cluster were easily visible together in hand held 10×50 binoculars, both appearing similar in magnitude and in size. In 15×70 binoculars (4 deg field) the cluster appeared round with the comet diffuse and fan shaped.

Like This Article
 0  
BAA Gallery Picture of the Week
Image search

Jupiter by Martin Mobberley

Image

Expand image

About this observation
Observer
Martin Mobberley
Time of observation
21/08/2011 - 23:36
Like This Image
 0  
Share
As the planet rises ever higher in our evening skies, this image of the "King"was taken by Martin using a 300mm f/5.3 Orion Optics Newt and 5x Powermate. Tru Tek red and blue filters (synthetic green from R & B) were used.The stacked frames were captured in Registax from roughly 2 x 2,000 frames using a SKYnyx 2-0 in Red & Blue filters, with roughly one minute per colour at 60 frames/sec. Additional processing was inPaint Shop Pro and Photoshop.
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.

Pages

Subscribe to British Astronomical Association RSS