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Blackett Observatory Dome
Welcome to the Marlborough College Blackett Observatory, home to the largest refracting telescope in Wiltshire. Learn more...
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SpaceWeather | More weather... Coordinates: 51.25.25 N and 1.44.24 W
Marlborough College
Oxford Astrophysics
Green Templeton College

Summer School week 2: Observatory visit (weather permitting) Meet at the Porters' Lodge at 9.20pm. Places must be booked on the list outside the SS office.


NASA Astronomy Picture of the Day
Milky Way over Uluru

What's Up - Week of 20th July

  • Darkness returns for an hour or so by the end of the week as Astronomical Twilight ends at 00.49 on Wednesday and at 00.13 by Sunday

  • The Moon is now waxing to First Quarter on Thursday

  • The Sun is still inactive despite 4 sunspot groups

  • There are no ISS passes this week

  • There are two bright evening Iridium flares this week; on Tuesday at 23.11.45 at 27 degrees altitude in W and Thursday 23.08.54 at 24 degrees in W

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Random Blackett Image
Projects - Telescope Restoration

News - 15th July

External lecture: CEB delivered the talk 'The oldest GOTO telescope in the World' to some 25 residents, the Warden, Steward and a Trustee of the Duchess of Somerset's Alms House in Froxfield

Summer School visit: 14 visitors from Week 1, including a family from near Bilbao and from Hong Kong, joined JAG and CEB at the Dome. The sky was largely cloudy, however gaps appeared and enabled the Summer Triangle, Arcturus, Antares and Spica to be seen along with the Saucepan and Polaris and Cassiopeia. Sevral satellites were spotted. The ETX was used to view Mizar and Alcor and split the binary Mizar A and B

28th June

IOAA Training Camp: CEB and Sandor Kruk from Oxford Astrophysics spent the day in Oxford with the 3 pupils who are to compete at the IOAA in Indonesia at the end of the month (The first time a British Team has entered). The Pupils practiced questions and, using solar goggles and the ETX, were able to view the Sun, though there was only one pair of sunspots. In the warm evening, on Merton playing fields using the ETX, many objects were viewed and coordinates and angular seperations practiced, until the sky clouded over at midnight; including Venus' crescent phase, Jupiter and 3 moons, the Gibbous Moon and its main ray craters. Mizar and Alcor among other Doubles were split and also Mizar A and B seen

18th June

External visit: 15 Pupils from Marlborough Malaysia and two teachers came up to the Dome with 2 ex-pupils from Waterford Kamhlabe United World College in Swaziland. A faint CZA was visible when we first reached the Dome (2nd in a week!) The Sun was then viewed in solar goggles and the with ETX and white light filter. The sky was too cloudy sadly for the H alpha filter

16th June

External visit: A large group of local group of Ladies Who Latte came up to the Dome late afternoon. Though no Latte was provided they were greeted at 6.30pm by a clear sky and for the first time that I have seen, 3 solar atmospheric phenomena. Either side of the Sun were clear Parhelia (sundogs)or rainbow clouds, 11 degrees from the Sun at 9 and 3 o'clock. Joining them was a faint Parhelic circle of diameter 22 degrees. Most beutiful however was a clear Cicumzenithal arc (CZA)an inverted rainbow arc directly above the Sun. These all lasted for 15 minutes or so. The Sun was then viewed in solar goggles, Solarscope and then the ETX, which showed clearly the group 2367. The 10 inch was then used with the H alpha filter to view spot 2365 and its Plage. Very faint prominences were seen, however the sky had already become hazy

15th June

External visit: 2 yr 12 pupils from Pate's Grammar School in Cheltenham visited the Dome at the start of a work experience week, where they are to assist in the putting together an exhibiton of astronomical images which will hopefully run early in 2016. The sky had rather clouded over but in bright breaks the Sun was viewed in solar goggles, the ETX (which clearly showed the large sunspot group 2367 with umbra and penumbra and then the 10 inch and H-alpha filter which showed some clear prominences and granulation

External lecture: CEB gave the lectue 'The oldest GOTO telescope in the World' to a large gathering of Chipping Norton Amateur Astronomy Group

13th May

Solar open day: 15 Friends and College staff gathered on a clear sunny afternoon. The Sun was veiwed in the Solarviewer which clearly showed the enormous sunspot group 2339 and 2345. The ETX showed excellent detail of the umbra and penumbra of the larger spots and clear striation in the penumbra. The main pair of spots were seen also to split into further pairs. Some 7 other spot groups were visible. The 10" viewed the Sun in H alpha and was focused on the lower limb where an enormous quiescent Hedge Prominence was seeen in the process of lifting of the surface. A great deal of detail was evident and the shape change perceptively over the 2 hours of observing

24th April

NASA lesson: The top Remove Physics sets had a lesson with Dr Abell and were able to ask plenty of questions

23rd April

NASA visit: Dr Paul Abell, lead scientist for small planetary bodies at Johnson Space Centre, Houston, came to the College for an outreach visit. He talked to Physicits and Astronomers about detecting, monitoring and intercepting asteroids and then gave an open talk on Asteroid Impact Threat and the Chelyabinsk Event in 2013

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