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 3: Observatory open Wednesday 26th (weather permitting). Meet at the Porters Lodge 9.30pm prompt (sign-up sheets in Summer School office from Monday lunchtime). See Gavin James for more details

NASA Astronomy Picture of the Day
Int-Ball Drone Activated on the Space Station

What's Up - Week of 24th July

  • Astronomical twilight ends at 00.21 BST at the start of the week and 23.51 BST at the end

  • The Moon will wax to First Quarter at the start of next week

  • The Sun is now blank again

  • The ISS makes good passes this week: Monday 23.05.49 SW to E to 52 degrees. Tuesday 22.13.45 SW to E to 36 degrees and 23.49.49 W to E to 89 degrees. Wednesday 22.57.30 WSW to E to 76 degrees. Thursday 22.05.14 WSW to E to 58 degrees and 23.41.37 W to E to 84 degrees. Friday 22.49.15 W to E to 88 degrees . Saturday 21.56.53 WSW to E to 81 degrees and 23.33.22 W to E to 89 degrees and Sunday 22.40.59 W to E to 84 degrees

  • There are three bright evening Iridium flares this week on Monday at 23.16.39 at 11 degrees altitude in WNW and at 23.55.53 ar 39 degrees in WSW and on Tuesday at 21.50.47 at 19 degrees in NNW


Random Blackett Image
The innermost of the Galilean moons of Jupiter, coloured due to its sulphurous, volcanic surface, crosses in front of the parent planet, preceded by its sharp black shadow. (NASA, Hubble)

News - 19th July

Summer School week 2: 14 visitors from Summer School joined CEB, DGR, GJ at the Dome. Sadly the sky was cloudy

12th July

Summer School week 1: Some 35 adults and children from Summer School joined CEB, DGR, JAG and GJ at the Dome. The sky was laregly cloudy but occasional bright stars (Arcturus and Vega) were glimpsed

4th to 6th July

National Astronomy Meeting: The 2017 NAM took place in Hull. CEB presented a poster on the new British Astronomy and Astrophyics Olympiad initiative

21st June

Solstice observing: Despite some high cloud and very warm air, the eclectic group, including Norwood Hall and admin staff, Common Room and associated families, local Friends of the Telescope, that gathered with CEB and JAG had plenty to see. The northernmost sunset point was noticed and, as the twilight darkened, Jupiter was identified and then viewed in Binos and the ETX with 2 moons visible. Arcturus and Vega were next out and then Spica. Though low to the horizon, as Saturn appeared in the light sky, the 10 inch was used to view the rings and then moons, first Titan then Rhea. As the sky darkened a little towards midnight the telescope was turned to the great globular cluster in Hercules, M13 and lastly the Ring planetary nebula, M57

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