astronomy

Owens Valley Radio Observatory

Owens Valley Radio Observatory is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Owens Valley Radio Observatory rather than just read about it. In short: Owens Valley Radio Observatory (OVRO) is a radio astronomy observatory located near Big Pine, California (US) in Owens Valley. It lies east of the Sierra Nevada, approximately 350 kilometers (220 miles) north of Los Angeles and 20 kilometers (12 miles) southeast of Bishop.

Key takeaways

Owens Valley Radio Observatory belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Owens Valley Radio Observatory to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Owens Valley Radio Observatory from memory before moving on to harder problems.

Reference excerpt

Owens Valley Radio Observatory (OVRO) is a radio astronomy observatory located near Big Pine, California (US) in Owens Valley. It lies east of the Sierra Nevada, approximately 350 kilometers (220 miles) north of Los Angeles and 20 kilometers (12 miles) southeast of Bishop. It was established in 1956, and is owned and operated by the California Institute of Technology (Caltech). The Owens Valley Solar Array portion of the observatory has been operated by New Jersey Institute of Technology (NJIT) since 1997. One of the ten dish-antenna radiotelescope systems of the Very Long Baseline Array is located on a sublease within the Owens Valley observatory.

About The Owens Valley Radio Observatory (OVRO), one of the largest university-operated radio observatories in the world, has its origins in the late 1940s with three individuals: Lee DuBridge, president of California Institute of Technology (Caltech); Robert Bacher, chairman of the Division of Physics, Mathematics and Astronomy; and Jesse Greenstein, professor of astrophysics. In 1954, Caltech occupied a central position in the American radio astronomy program. John Bolton and Gordon Stanley, two respected Australian astronomers, joined the Caltech faculty in order to undertake the construction of large dishes. In 1956 the first radio telescope, a 32-foot (9.8 m) antenna, was erected on Palomar Mountain. It was dismantled in 1958 and transferred to the Owens Valley site. At the same time, two 90-foot (27.4 m) telescopes were completed. Ten years later, an even bigger antenna, a 130-foot (39.6 m) dish was finished. Over the period of 1985 to 1996, a millimeter-wave array was commissioned at OVRO. It consisted of six 34-foot (10.4 m) dishes (also called Leighton's dishes). The millimeter array dishes become part of CARMA when that array was commissioned. OVRO has used its telescopes and other instruments (listed below) to improve on the locations of radio sources in the sky, to study hydrogen clouds within the Milky Way, galaxy formation, active galactic nuclei ("blazars"), fast radio bursts, and other radioastronomical phenomena. This research is performed by the staff at the observatory with help from professors and post-doctoral students from many institutions. The observatory is different from other radio observatories because of its extensive work with graduate students, who can come to the observatory for long-term observation, benefiting not only the students, but also the observatory as it allows for more comprehensive projects to take place.

CARMA

OVRO staff took a large share of the responsibility for operating CARMA, which was located 20 miles (32 km) east of OVRO in the Inyo Mountains, but was decommissioned in 2015. CARMA was a collaboration between Caltech, University of California Berkeley, University of Illinois, University of Maryland, and University of Chicago to observe space at centimeter and millimeter wavelengths with a 23-element interferometer. CARMA used this interferometer to study the origins of planets, stars and galaxies, as well as to measure the distortions in the cosmic microwave background caused by clusters of galaxies formed soon after the Big Bang.

Instruments A Pathfinder instrument for the Carbon Monoxide Mapping Array Project (COMAP) was commissioned in November 2018 to create carbon monoxide intensity maps of the universe between redshifts of 2.4 and 3.4. The COMAP Pathfinder receiver is installed on one of the 10-meter telescopes of the former millimeter array. KuPol, or Ku-band Polarimeter, is an instrument that was installed on the OVRO 40 meter Telescope in 2007 and is used to monitor blazars. The Expanded Owens Valley Solar Array (EOVSA) is a solar radio telescope array currently in operation at OVRO. It incorporates seven refurbished dishes from OVSA, along with eight new 2 m (6.6 ft) antennas, and one of OVRO's 27-meter telescopes. The small dishes are arranged in a three-arm spiral pattern. The Owens Valley Long Wavelength Array, commissioned in 2013, is a duplicate of the Long Wavelength Array in New Mexico. It consists of 288 dipole antennas spread out over a desert area equivalent to about 450 football fields. The OVRO-LWA produces whole-sky radio images in the 30 to 88 megahertz band. The Deep Synoptic Array (DSA-10) is an array of 10 4.5 m (15 ft) parabolic radio telescopes currently used to detect and locate Fast Radio Bursts (FRB)s. An expanded, 110-element DSA-110 is currently used to study fast radio bursts. It was commissioned in 2023 with 100 operational dishes.

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Illustrations

Worked examples

Example 1 — a first encounter with Owens Valley Radio Observatory

Start with the simplest possible case. Write down what Owens Valley Radio Observatory claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Owens Valley Radio Observatory before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Owens Valley Radio Observatory ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Owens Valley Radio Observatory

In research: Owens Valley Radio Observatory appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Owens Valley Radio Observatory in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Owens Valley Radio Observatory is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical observatories in California, Buildings and structures in Inyo County, California, California Institute of Technology buildings and structures, so understanding it makes those chapters shorter.
In everyday life: Look for Owens Valley Radio Observatory outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Owens Valley Radio Observatory in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Owens Valley Radio Observatory means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Owens Valley Radio Observatory out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Owens Valley Radio Observatory in simple terms?

Why does Owens Valley Radio Observatory matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Owens Valley Radio Observatory?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Owens Valley Radio Observatory.