A report on Double star, Apparent magnitude and Observational astronomy

Astronomers have mistakenly reported observations of a double star in place of J 900 and a faint star in the constellation of Gemini.
Asteroid 65 Cybele and two stars, with their magnitudes labeled
Mayall telescope at Kitt Peak National Observatory
Artist's impression of the discs around the young stars HK Tauri A and B.
Image of 30 Doradus taken by ESO's VISTA. This nebula has a visual magnitude of 8.
An assembly in Estonia to observe meteors
Graph of relative brightness versus magnitude
The Crab Nebula as seen in various wavelengths
Ultra HD photography taken at La Silla Observatory.
ALMA is the world's most powerful telescope for studying the Universe at submillimeter and millimeter wavelengths.
Fully-steerable radio telescope in Green Bank, West Virginia.
Skalnaté pleso observatory, Slovakia.
One of the Oldest Observatories in South America is the Quito Astronomical Observatory, founded in 1873 and located 12 minutes south of the Equator in Quito, Ecuador. The Quito Astronomical Observatory is the National Observatory of Ecuador and is located in the Historic Center of Quito and is managed by the National Polytechnic School.
An amateur astrophotography setup with an automated guide system connected to a laptop.
50 cm refracting telescope at Nice Observatory.
The main platform at La Silla hosts a huge range of telescopes with which astronomers can explore the Universe.

In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes.

- Double star

Since that time, the search has been carried out thoroughly and the entire sky has been examined for double stars down to a limiting apparent magnitude of about 9.0.

- Double star

But in observational astronomy and popular stargazing, unqualified references to "magnitude" are understood to mean apparent magnitude.

- Apparent magnitude

For example, photometry on closely separated double stars may only be able to produce a measurement of their combined light output.

- Apparent magnitude

The position or cross-wire micrometer is an implement that has been used to measure double stars.

- Observational astronomy

By 1951 an internationally standardized system of UBV-magnitudes (Ultraviolet-Blue-Visual) was adopted.

- Observational astronomy
Astronomers have mistakenly reported observations of a double star in place of J 900 and a faint star in the constellation of Gemini.

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