The new East Dome is the fourth third dome to be built in the grounds of Sydney Observatory. The second was built by Henry Russell in 1880. His star camera was installed here in 1890. Sydney Observatory's second 'third dome' was constructed from corrugated iron and had a conical roof.
Overnight on Australia Day 2015 the asteroid 2004 BL86 passed Earth about three times further away than the Moon. NASA imaged it from their Goldstone station (and Arecibo) using radar. The Goldstone data revealed it has its own moon.
The new East Dome is the fourth third dome to be built in the grounds of Sydney Observatory. The first was built by Henry Russell in the 1870s. It had a shallow conical roof. Sydney Observatory's first 'third dome' was located beside the white shade pyramid in the front garden. ©MAAS.
This is the eighth post in a series which documents the development and construction of a new domed building for Sydney Observatory which is especially designed for use by people with disabilities and their carers.
6:30pm, 2 FEBRUARY, 2015 Craig Anderson, Doctoral Candidate, The University of Sydney. A Sydney City Skywatchers event. All welcome. Non-members $5 supper contribution. Members $2. 'By unfair means: Wresting secrets from active galaxies using preposterously powerful radio telescopes and a little bit of voodoo'.
Sydney Observatory's new East Dome officially opens today, 27 January, 2015. It is one of three domes on the site. The south dome was built in 1858 (enlarged in 1874) and the north dome was added in 1877.
Tonight asteroid 2004 BL86 will pass Earth, but three times further away than the Moon. The Arecibo radio telescope will measure its size and shape using radar. Asteroids pass Earth every day but this will be the closest by one this big, i.e.
As the First Fleet sailed into Sydney Harbour on Saturday 26 January 1788, there was no light pollution. The weather was clear and they would have had a clear view of the night sky that today, we can only imagine!
Henry Russell designed his own photographic telescope, or "astrograph", to photograph large parts of the southern sky for the Astographic Catalogue project. He called it a "star camera". It was used from 1890 until the 1940s.
The aim of the Astrographic Catalogue project was to photograph the entire sky and measure the positions of all the recorded stars. It began in 1887. Sydney Observatory's section was published in 52 volumes and contained 740,000 star positions.
In 1866 George Smalley, NSW Government Astronomer from 1863 to 1870, began recording tide heights. He installed an automated device at Fort Denison in Sydney Harbour. Tides are still measured from the same location today.
Evolution of a great sunspot AR12192. Sketch and copyright Harry Roberts ©, all rights reserved. Regular solar observer & correspondent Harry Roberts previously reported on the emergence of the great sunspot, AR12192.
Venus, also visible in the west after sunset at present, will move further from the Sun over the coming months. By late June and into July it will be visible during daylight hours - if you know exactly where to look.
When describing the planets we used to say Mercury looked "just like the Moon". But the Messenger spacecraft has shown us a whole new world. Look west after sunset this week to see Mercury. Mercury by the Messenger spacecraft.
Jupiter, King of the Planets, is returning to the evening sky. It rises just before 9:30pm AEDT now, and will rise earlier night to night. Look for the bright yellow 'star' in the constellation Leo, the Lion, King of the Jungle!