Part of | Melbourne Observatory Mount Stromlo Observatory |
---|---|
Location(s) | Victoria, AUS |
Coordinates | 37°49′47″S144°58′34″E / 37.8297°S 144.976°E |
Telescope style | optical telescope |
Related media on Commons | |
The Great Melbourne Telescope was built by the Grubb Telescope Company in Dublin, Ireland in 1868, and installed at the Melbourne Observatory in Melbourne, Australia in 1869. In 1945 that Observatory closed and the telescope was sold and moved to the Mount Stromlo Observatory near Canberra. It was rebuilt in the late 1950s. In 2003 the telescope, still in use as an observatory, was severely damaged in a bushfire. About 70% of the components were salvageable; a project to restore the telescope to working condition started in 2013.
With a 48 inch (1.2 metre) diameter primary mirror, it was one of the largest telescopes of the late 19th century. This is a significant size even into the 21st century, although the lower reflecting ability of speculum metal mirrors (about 2/3 reflected) makes them inferior to later metal-on-glass designs or large refractors. This was significantly larger than the largest refractors of the period such as the Lick telescope and Yerkes, although those were both in the northern hemisphere (they would view the northern skies as opposed to the southern)
The telescope had a 48-inch-diameter (1,200 mm) speculum primary mirror, and was mounted on an equatorial mounting, enabling it to track the stars accurately as they appeared to move across the sky. The design had been approved by a committee of leading British astronomers and scientists. [1] At the time of commissioning it was the second largest telescope operating in the world, after Lord Rosse's 6 foot reflector at Birr, Ireland, and it was the largest fully steerable telescope in the world. [note 1]
The telescope was designed to explore the nebulae visible from the southern hemisphere, and in particular to document whether any changes had occurred in the nebulae since they were charted by John Herschel in the 1830s at the Cape of Good Hope. [2]
The Great Melbourne Telescope was built by Thomas Grubb in Dublin, Ireland in 1868, and installed at the Melbourne Observatory in Melbourne, Australia in 1869. [3] [4] [5]
After some initial teething problems, the telescope was used for about 20 years at Melbourne Observatory, and one volume of observations produced, along with spectroscopic observations and some pioneering attempts at photographing nebulae. The telescope was upgraded with the addition of photographic equipment in 1872, [6] but the difficulties of repolishing the mirror and the telescope's relative unsuitability for astrophotography deterred further use. [7]
When Melbourne Observatory closed in 1945, the Great Melbourne Telescope was sold to the Australian Government's Mount Stromlo Observatory near Canberra. It was rebuilt in the late 1950s with modern drive and a new 50-inch (1,300 mm) pyrex mirror. In the early 1990s the telescope, still utilising Grubb's original equatorial mounting, was rebuilt with two charge-coupled device (CCD) arrays to detect MACHOs (massive astrophysical compact halo objects). This made it Australia's first professional robotic and computerized digital imaging telescope. [8] [9]
In January 2003 an extreme bushfire destroyed the telescopes and buildings at Mount Stromlo - the temperatures were so high that the aluminium dome itself caught fire and melted onto the telescope, shattering the mirror. [10] The fire-ravaged remnants of the telescope were transferred to Museum Victoria, which had previously acquired discarded parts of the original telescope in 1984. [11]
After the fire about 70% of the Great Melbourne Telescope's components remained in reusable condition. [12] A project was set up to restore it to working order and bring its optical, mechanical and electrical systems into line with current best practice, so that it may be used for educational and public viewing in its original home at the Melbourne Observatory. This is a joint undertaking of Museum Victoria, the Astronomical Society of Victoria and the Melbourne Royal Botanic Gardens. After more than five years weighing up different proposals, engineering work commenced in late 2013 thanks to a grant of A$70,000 from the Copland Foundation. [13] [14] [15] As of 2021 restoration work was continuing. [12] [16] The Victorian government committed $600,000 for the first stage of the restoration, and private benefactors also provided financial support. In November 2019, the main structure of the telescope was reassembled for the first time in 74 years. [9]
1849 | The British Association for the Advancement of Science calls for a large reflecting telescope to be erected in the Southern Hemisphere. |
1853 | First astronomical observatory at Williamstown. |
1863 | Melbourne Observatory opens. |
1865 | The Victorian Government orders the telescope from Thomas Grubb, Dublin. |
1868 | Great Melbourne Telescope (GMT) arrives in Melbourne. |
1869 | Observations of nebulae, comet and Neptune are made. |
1872 | The telescope was upgraded with the addition of photographic equipment |
1883 | First photos taken of Orion Nebula from Southern Hemisphere. |
1894 | GMT used for sketches of Mars at its close approach to Earth. |
1944 | Melbourne Observatory closes. |
1945 | GMT moves to Mount Stromlo Observatory near Canberra. |
1961 | Telescope rebuilt with a 1.25m pyrex mirror and new controls. Used for photoelectric photometry and infrared observations. |
1973 | Decommissioned when a bearing fails. |
1992 | GMT rebuilt for the MACHO project to detect evidence of dark matter. |
2003 | Bushfires destroy major telescopes and buildings at Mount Stromlo. |
2008 | Remaining parts of GMT returned to Melbourne. |
2009 | SkyMapper a telescope built to replace GMT opened at Siding Spring Observatory. |
2012 | Museum Victoria, the Astronomical Society of Victoria and the Royal Botanic Gardens start a collaboration to restore the telescope at Melbourne Observatory. |
2019 | Main structure re-assembled for the first time in 74 years. |
Yerkes Observatory is an astronomical observatory located in Williams Bay, Wisconsin, United States. The observatory was operated by the University of Chicago Department of Astronomy and Astrophysics from its founding in 1897 to 2018. Ownership was transferred to the non-profit Yerkes Future Foundation (YFF) in May 2020, which began restoration and renovation of the historic building and grounds. Re-opening for public tours and programming began May 27, 2022.
Speculum metal is a mixture of around two-thirds copper and one-third tin, making a white brittle alloy that can be polished to make a highly reflective surface. It was used historically to make different kinds of mirrors from personal grooming aids to optical devices until it was replaced by more modern materials such as metal-coated glass mirrors.
The Dominion Astrophysical Observatory, located on Observatory Hill, in Saanich, British Columbia, was completed in 1918 by the Canadian government. The Dominion architect responsible for the building was Edgar Lewis Horwood. The main instrument is the 72-inch-aperture (1.83 m) Plaskett telescope, proposed and designed by John S. Plaskett in 1910 with the support of the International Union for Cooperation in Solar Research.
The Isaac Newton Telescope or INT is a 2.54 m (100 in) optical telescope run by the Isaac Newton Group of Telescopes at Roque de los Muchachos Observatory on La Palma in the Canary Islands since 1984.
Siding Spring Observatory near Coonabarabran, New South Wales, Australia, part of the Research School of Astronomy & Astrophysics (RSAA) at the Australian National University (ANU), incorporates the Anglo-Australian Telescope along with a collection of other telescopes owned by the Australian National University, the University of New South Wales, and other institutions. The observatory is situated 1,165 metres (3,822 ft) above sea level in the Warrumbungle National Park on Mount Woorat, also known as Siding Spring Mountain. Siding Spring Observatory is owned by the Australian National University (ANU) and is part of the Mount Stromlo and Siding Spring Observatories research school.
Mount Stromlo Observatory located just outside Canberra, Australia, is part of the Research School of Astronomy and Astrophysics at the Australian National University (ANU).
The Stockholm Observatory is an astronomical observatory and institution in Stockholm, Sweden, founded in the 18th century and today part of Stockholm University. In 1931, the new Stockholm Observatory, nicknamed "Saltis", was inaugurated on the Karlsbaderberget at Saltsjöbaden, near Stockholm, and operated until 2001.
Hamburg Observatory is an astronomical observatory located in the Bergedorf borough of the city of Hamburg in northern Germany. It is owned and operated by the University of Hamburg, Germany since 1968, although it was founded in 1825 by the City of Hamburg and moved to its present location in 1912. It has operated telescopes at Bergedorf, at two previous locations in Hamburg, at other observatories around the world, and it has also supported space missions.
Melbourne Observatory is an observatory located on a hill adjacent to the Royal Botanic Gardens Victoria. The observatory commenced operations in 1862 and was decommissioned from official Government work in 1945. The observatory has since continued as an astronomical observatory and remains open to the public. Melbourne Observatory is also permanently on the Australian National Heritage List under 'Melbourne's Domain Parkland and Memorial Precinct' since early 2018.
Grubb Parsons was a historic manufacturer of telescopes, active in the 19th and 20th centuries. They built numerous large research telescopes, including several that were the largest in the world of their type.
Thomas Grubb was an Irish optician and founder of the Grubb Telescope Company.
The Crossley telescope is a 36-inch (910 mm) reflecting telescope located at Lick Observatory in the U.S. state of California. It was used between 1895 and 2010, and was donated to the observatory by Edward Crossley, its namesake.
Great refractor refers to a large telescope with a lens, usually the largest refractor at an observatory with an equatorial mount. The preeminence and success of this style in observational astronomy defines an era in modern telescopy in the 19th and early 20th century. Great refractors were large refracting telescopes using achromatic lenses. They were often the largest in the world, or largest in a region. Despite typical designs having smaller apertures than reflectors, great refractors offered a number of advantages and were popular for astronomy. It was also popular to exhibit large refractors at international exhibits, and examples of this include the Trophy Telescope at the 1851 Great Exhibition, and the Yerkes Great Refractor at the 1893 World's Fair in Chicago.
Sidney Charles Bartholemew "Ben" Gascoigne was a New Zealand-born optical astronomer and expert in photometry who played a leading role in the design and commissioning of Australia's largest optical telescope, the Anglo-Australian Telescope, which for a time was one of the world's most important astronomical facilities. Born in Napier, New Zealand, Gascoigne trained in Auckland and at the University of Bristol, before moving to Australia during World War II to work at the Commonwealth Solar Observatory at Mount Stromlo in Canberra. He became skillful in the design and manufacture of optical devices such as telescope elements.
The Astronomical Society of Victoria (ASV) is an amateur astronomy club in the state of Victoria, Australia. It was founded in 1922, making it one of the oldest such clubs in the country, and with some 1500 members it claims to be one of the largest amateur astronomy organisations in the southern hemisphere. Membership is open to all with an interest in astronomy, and the society caters for people with a wide range of ages, backgrounds, abilities and interests.
The Linden Observatory Complex is a heritage-listed former observatory and manufacture of optical precision implements and now residence, museum, observatory, education facility and meeting venue located at 91 – 111 Glossop Road, Linden, City of Blue Mountains, New South Wales, Australia. It was designed and built by Ken Beames from 1938 to 1948. It is also known as K Beames Engineering Co. The property is owned by the Linden Observatory Trust. It was added to the New South Wales State Heritage Register on 5 March 2010.
The Greenwich 28-inch refractor is a telescope at the Royal Observatory, Greenwich, where it was first installed in 1893. It is a 28-inch ( 71 cm) aperture objective lens telescope, otherwise known as a refractor, and was made by the telescope maker Sir Howard Grubb. The achromatic lens was made Grubb from Chance Brothers glass. The mounting is older however and dates to the 1850s, having been designed by Royal Observatory director George Airy and the firm Ransomes and Simms. The telescope is noted for its spherical dome which extends beyond the tower, nicknamed the "onion" dome. Another name for this telescope is "The Great Equatorial" which it shares with the building, which housed an older but smaller telescope previously.