Dr Tyler Eugene Nordgren | |
---|---|
Born | November 18, 1969 |
Nationality | American |
Alma mater | Reed College Cornell University |
Scientific career | |
Fields | Astronomy |
Institutions | United States Naval Observatory Flagstaff Station Lowell Observatory University of Redlands |
Thesis | A Neutral Hydrogen Study of Close and Wide Galaxy Pairs (1997) |
Tyler Eugene Nordgren (November 18, 1969) is an astronomer and professor of physics at the University of Redlands. [1]
Nordgren earned a B.A. in physics from Reed College and an M.S. and Ph.D. in astronomy from Cornell University.
Before joining the University of Redlands in 2001, Nordgren was an astronomer at the United States Naval Observatory Flagstaff Station and Lowell Observatory. [2]
In 2004, with six other astronomers and artists, Nordgren helped develop MarsDials, functioning sundials that NASA's Spirit, Opportunity, and Curiosity rovers carried with them to Mars. [3] [4]
Nordgren also designed the giant sundial that resides on the wall of Appleton Hall at the University of Redlands and is accurate within 10 minutes. [5] [6]
For the past five years, Nordgren has been traveling around the U.S. to educate the public about what eclipses are and how the opportunity to see the total solar eclipse on August 21, 2017 should not be missed. [7] [8] More of Nordgren's research on eclipses can be found in his most recent book Sun Moon Earth: The History of Solar Eclipses from Omens of Doom to Einstein and Exoplanets (Basic Books, 2016). [9]
Nordgren has been a member of the National Park Service Night Sky Team since 2007, working with the U.S. National Park Service to protect the night skies and promote astronomy education in U.S. national parks. [10] [11]
Nordgren has helped document the parks' night skies with photography that has been on display in galleries from New York City to Flagstaff, Arizona, and is on display in a number of national parks. [12] The Acadia Night Sky Festival has featured many of his photographs. [13] [14] Nordgren has also developed a poster campaign in conjunction with the National Park Service to “See the Milky Way” in America’s parks where “Half the Park is After Dark.” [15]
His 2010 book Stars Above, Earth Below: A Guide to Astronomy in the National Parks (Praxis, 2010) was published as a way to spread the message of the importance of protecting the night sky. [16]
Nordgren was elected to the board of directors of the International Dark-Sky Association (IDA) in 2011. [17] He is also a member of the American Astronomical Society. [18]
Altair is the brightest star in the constellation of Aquila and the twelfth-brightest star in the night sky. It has the Bayer designation Alpha Aquilae, which is Latinised from α Aquilae and abbreviated Alpha Aql or α Aql. Altair is an A-type main-sequence star with an apparent visual magnitude of 0.77 and is one of the vertices of the Summer Triangle asterism; the other two vertices are marked by Deneb and Vega. It is located at a distance of 16.7 light-years from the Sun. Altair is currently in the G-cloud—a nearby interstellar cloud, an accumulation of gas and dust.
Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies. The first detection of radio waves from an astronomical object was in 1933, when Karl Jansky at Bell Telephone Laboratories reported radiation coming from the Milky Way. Subsequent observations have identified a number of different sources of radio emission. These include stars and galaxies, as well as entirely new classes of objects, such as radio galaxies, quasars, pulsars, and masers. The discovery of the cosmic microwave background radiation, regarded as evidence for the Big Bang theory, was made through radio astronomy.
The table lists various objects and units by the order of magnitude of their volume.
The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,710-foot (1,740-meter) peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles.
An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks from view (occults) an object in the background. In this general sense, occultation applies to the visual scene observed from low-flying aircraft when foreground objects obscure distant objects dynamically, as the scene changes over time.
In astronomy, an extraterrestrial sky is a view of outer space from the surface of an astronomical body other than Earth.
The Navy Precision Optical Interferometer (NPOI) is an American astronomical interferometer, with the world's largest baselines, operated by the Naval Observatory Flagstaff Station (NOFS) in collaboration with the Naval Research Laboratory (NRL) and Lowell Observatory. The NPOI primarily produces space imagery and astrometry, the latter a major component required for the safe position and navigation of all manner of vehicles for the DoD. The facility is located at Lowell's Anderson Mesa Station on Anderson Mesa about 25 kilometers (16 mi) southeast of Flagstaff, Arizona (US). Until November 2011, the facility was known as the Navy Prototype Optical Interferometer (NPOI). Subsequently, the instrument was temporarily renamed the Navy Optical Interferometer, and now permanently, the Kenneth J. Johnston Navy Precision Optical Interferometer (NPOI) – reflecting both the operational maturity of the facility, and paying tribute to its principal driver and retired founder, Kenneth J. Johnston.
Chi Ursae Majoris or χ Ursae Majoris, formally named Taiyangshou, is a single star in the northern circumpolar constellation of Ursa Major. The star has an orange hue and is visible to the naked eye at night with an apparent visual magnitude of 3.72. It is located at a distance of approximately 184 light-years from the Sun based on parallax, but is drifting closer with a radial velocity of −9 km/s.
The CHARA array is an optical interferometer, located on Mount Wilson, California. The array consists of six 1-metre (40 in) telescopes operating as an astronomical interferometer. Construction was completed in 2003. CHARA is owned by Georgia State University (GSU).
Mu Pegasi or μ Pegasi, formally named Sadalbari, is a star in the northern constellation of Pegasus. The apparent visual magnitude of this star is 3.5, which is bright enough to be seen with the naked eye even on a moonlit night. Based upon parallax measurements taken during the Hipparcos mission, it is approximately 106 light-years from the Sun.
39 Arietis, officially named Lilii Borea, is a star in the northern constellation of Aries. It is visible to the naked eye with an apparent visual magnitude of +4.5. The distance to this star, as determined from an annual parallax shift of 19.01 mas, is approximately 172 light-years . This star was formerly located in the obsolete constellation Musca Borealis.
An astronomical interferometer or telescope array is a set of separate telescopes, mirror segments, or radio telescope antennas that work together as a single telescope to provide higher resolution images of astronomical objects such as stars, nebulas and galaxies by means of interferometry. The advantage of this technique is that it can theoretically produce images with the angular resolution of a huge telescope with an aperture equal to the separation, called baseline, between the component telescopes. The main drawback is that it does not collect as much light as the complete instrument's mirror. Thus it is mainly useful for fine resolution of more luminous astronomical objects, such as close binary stars. Another drawback is that the maximum angular size of a detectable emission source is limited by the minimum gap between detectors in the collector array.
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of the Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season in its new moon phase, when the Moon's orbital plane is closest to the plane of the Earth's orbit. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured. Unlike a lunar eclipse, which may be viewed from anywhere on the night side of Earth, a solar eclipse can only be viewed from a relatively small area of the world. As such, although total solar eclipses occur somewhere on Earth every 18 months on average, they recur at any given place only once every 360 to 410 years.
The United States Naval Observatory Flagstaff Station (NOFS), is an astronomical observatory near Flagstaff, Arizona, US. It is the national dark-sky observing facility under the United States Naval Observatory (USNO). NOFS and USNO combine as the Celestial Reference Frame manager for the U.S. Secretary of Defense.
Australian Aboriginal astronomy is a name given to Aboriginal Australian culture relating to astronomical subjects – such as the Sun and Moon, the stars, planets, and the Milky Way, and their motions on the sky.
The Oliver Observing Station is an independent professional astronomical observatory named after Barnard M. Oliver. It is owned and operated by The Monterey Institute for Research in Astronomy (MIRA).
Eta Herculis is a fourth-magnitude star in the constellation Hercules.
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a significant amount of jargon.
Astronomy Photographer of the Year is an annual astronomy photography competition and exhibition that is organised by the Royal Observatory, Greenwich.