Image by Alex Pratt.

Alex writes:

“The attached image was taken on the night before the recent Full Moon. I chose that evening because the following night it would be lower in the sky and the weather forecast was unfavourable.

The image is a mosaic of 16 webcam sessions, each centred on the sections of the Moon in Henry Hatfield’s Photographic Lunar Atlas. Seeing was Antoniadi III at best, which was disappointing.

Colour saturation was applied to enhance the lunar features, especially the maria. The resultant webcam images were stitched together into a mosaic and further slight processing was done to sharpen the image, increase contrast and colour saturation.

It was a lot of work. I’ve no plans to repeat this exercise, but I will take further images of selected areas, such as Mare Tranquillitatis, which seems to have a very mottled nature.”

Now is the time for observers in the northern hemisphere to look for Mercury in the west after sunset with the naked eye, or during the afternoon telescopically.
Mercury attains greatest eastern elongation (angular distance from the Sun) on March 23, when it will be 19 degrees east of the Sun, and from now until the end of the month will be easily visible to the naked eye just after sunset, due west, and very low down. At the end of civil twilight, 35 minutes after sunset, from latitude 52 degrees north, Mercury will be 12 degrees above the horizon on March 23, dropping to 6 degrees by April 2. The magnitude will fall from -0.6 on March 20 to +1.4 on March 30, and the phase will decrease from 56% to 18% as the angular diameter increases from 6.8 to 9.2 seconds of arc over the same period. Jupiter was close to Mercury earlier this month, but is now too close to the Sun for observation.
With a telescope, observations of Mercury can be made during the day, when the planet is high in the sky, but, as always, great care is necessary when using a telescope with the Sun above the horizon. The planet may be located using setting-circles, or a calibrated GOTO mount, or by angular offset from the Sun. A portable GOTO mount may be calibrated by pointing the telescope at the Sun using the method of minimising the shadow, then using the finder to project the Sun’s image. The mount should then be synchronised with the Sun, and, provided it is correctly polar aligned, should be able to accurately slew to Mercury. The telescope must not be looked through when it is pointing anywhere near the Sun, and if it is necessary to sweep the telescope to locate Mercury, always sweep away from the Sun. The sky needs to be perfectly clear to locate Mercury in the daytime; thin cloud or even haze will scatter too much sunlight. I do not recommend attempting to find Mercury in daylight with unmounted binoculars.
The Mercury & Venus Section welcomes any drawings or images of Mercury. See the website (http://britastro.org/mercuryandvenus) for details of how to submit. Seeing conditions for Mercury are often at their best slightly before sunset, when the atmosphere is cooler, rather  than earlier, when the planet is higher in the sky.
With the Mercury Messenger spacecraft having successfully achieved orbit round the planet last Thursday, March 17, the first time a probe has been put into orbit round the innermost planet, we have the prospect of a huge imminent increase of our knowledge of this world. Though Messenger has already flown past Mercury more than a dozen times, only on April 4 will the mission’s primary science phase begin. It will be interesting to reflect on this, watching the tiny speck of light in the twilight sky; this will be, in a sense, the last apparition of Mercury as the Planet of Mystery.
David Arditti
Image taken before sunset on March 19, in infrared light. The bright spot near the limb south of the equator corresponds to the bright ejecta blanket surrounding the crater Kuiper, the most brilliant feature on Mercury.

Saturn image by Martin Mobberley (Suffolk), on March 19th 2011.

The ‘Saturn Storm’ is still clearly visible.

Image made in two parts using a Lunt LS60T solar telescope and a DMK camera, from Edgeware, Middlesex by David Arditti.

The 2011 BAA Deep Sky Section meeting will take place on Saturday March 12 at Ashford Hill Village Hall, Ashford Hill, near Thatcham, Newbury, Berks, RG19 8BQ.  The meeting will be hosted by Newbury Astronomical Society.  Doors will be open from 9.30 with coffee available from 10.00 and talks starting at 10.30.  It is expected that the meeting will finish around 17.30. All BAA members and their friends are welcome. There is plenty of free car parking at the venue.

Entrance fee will be £10 payable on the door and includes a buffet lunch.

As the Section reaches the grand old age of 30 this year, some of the talks will look back at what has changed in deep sky observing during this time. The planned programme is given below.

10.30 – 11.00    welcome and review of the year – Stewart Moore

11.00 – 11.30    then and now – 30 years of Section images – Stewart Moore

11.30 – 12.15    using the f/2 Hyperstar system for deep sky imaging – David Arditti

12.15 – 12.45    galaxy clusters for the amateur – Owen Brazell

12.45 – 13.00    a brief update on the BAA Variable Nebula Project – Grant Privett

13.00                Buffet Lunch

14.30 – 15.00    then and now – 30 years of supernova hunting – Ron Arbour

15.00 – 15.30    astrophotography in the 1980s, or why I didn’t blow myself up – Geoffrey Johnstone

15.30                Tea

16.00 – 16.45    Active Galactic Nebulae and why we should observe them – Nick Hewitt

16.45 – 17.30    the Herschel Space Telescope and star formation – Prof.. Derek Ward-Thompson

17.30                meeting round up – Stewart Moore

Exhibition of deep sky material by Section members is encouraged (bring your own display boards).

Both the BAA and the Webb Deep Sky Society hope to have sales stands at the meeting.

Astro Jumble – do you have any astronomical related books / equipment / software etc. to sell or give away?  If so, bring them to the meeting where a side room will be available  for you to display them.  You will need to bring your own display table.  Naturally neither the BAA nor Newbury Astronomical Society can be responsible for anything bought or sold.

The Deep Sky meeting is the highlight of the Section year and I look forward to seeing as many of you there as possible.

Stewart Moore,  Director BAA Deep Sky Section.

2011 March 7th

M44, the Beehive Nebula, also known as Praesepe, in Cancer. Imaged by Alan Tough in Elgin.

Imaging equipment: Sky-Watcher 80ED (f/7.5), HEQ5 mount, Canon EOS 40D at prime focus, Astronomik CLS filter.
Guiding equipment: Sky-Watcher 100ED, StarShoot Autoguider.
Total imaging time 93 minutes.

Sets of 5- and 6-minute sub-frames (taken in February 2011 from Elgin, Scotland) were processed and stacked in Photoshop – utilising ProDigital Software’s Astronomy plug-ins and StarSpikes Pro.

Hazel/Andrew,

I understand that the B2B was a great success.

If you could get me a brief report and a few pics in the next couple of days, i should be able to include something in the May Astronomy Now “Grassroots Astronomy” column.

Thanks, Callum