9 Andromedae

9 Andromedae, abbreviated 9 And by convention, is a variable binary star system in the northern constellation Andromeda. ^[1]

21 relations: Andromeda (constellation), Apparent magnitude, Astronomical naming conventions, Astronomical transit, Beta Lyrae variable, Binary star, Constellation, Flamsteed designation, Julian day, Light curve, Light-year, Line of sight, Orbital eccentricity, Orbital elements, Orbital period, Orbital plane, Stellar parallax, Transiting Exoplanet Survey Satellite, Variable star, Variable-star designation, Walter Sydney Adams.
Beta Lyrae variables

Andromeda (constellation)

Andromeda is one of the 48 constellations listed by the 2nd-century Greco-Roman astronomer Ptolemy, and one of the 88 modern constellations.

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Apparent magnitude

Apparent magnitude is a measure of the brightness of a star or other astronomical object.

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Astronomical naming conventions

In ancient times, only the Sun and Moon, a few stars, and the most easily visible planets had names.

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Astronomical transit

In astronomy, a transit (or astronomical transit) is the passage of a celestial body directly between a larger body and the observer.

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Beta Lyrae variable

Beta Lyrae variables are a class of close binary stars. 9 Andromedae and Beta Lyrae variable are beta Lyrae variables.

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Binary star

A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.

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Constellation

A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.

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Flamsteed designation

A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.

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The Julian day is the continuous count of days since the beginning of the Julian period, and is used primarily by astronomers, and in software for easily calculating elapsed days between two events (e.g. food production date and sell by date).

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Light curve

In astronomy, a light curve is a graph of the light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y-axis and with time on the x-axis.

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Light-year

A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.

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Line of sight

The line of sight, also known as visual axis or sightline (also sight line), is an imaginary line between a viewer/observer/spectator's eye(s) and a subject of interest, or their relative direction.

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Orbital eccentricity

In astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another body deviates from a perfect circle.

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Orbital elements

Orbital elements are the parameters required to uniquely identify a specific orbit.

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Orbital period

The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object.

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Orbital plane

The orbital plane of a revolving body is the geometric plane in which its orbit lies.

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Stellar parallax

Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars.

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Transiting Exoplanet Survey Satellite

Transiting Exoplanet Survey Satellite (TESS) is a space telescope for NASA's Explorer program, designed to search for exoplanets using the transit method in an area 400 times larger than that covered by the Kepler mission.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time.

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Variable-star designation

In astronomy, a variable-star designation is a unique identifier given to variable stars. 9 Andromedae and variable-star designation are objects with variable star designations.

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Walter Sydney Adams

Walter Sydney Adams (December 20, 1876 – May 11, 1956) was an American astronomer.

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References

[1] https://en.wikipedia.org/wiki/9_Andromedae

Also known as 9 And, AN And, AN Andromedae, HD 219815, HIC 115065, HIP 115065, HR 8864, SAO 52881.

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