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9 Sagittarii

9 Sagittarii (9 Sgr) is an emission-line star in Sagittarius. [1]

5 relations: Epoch (astronomy), Flamsteed designation, Sagittarius (constellation), Spectral line, Star.

Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.

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Flamsteed designation

Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.

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Sagittarius (constellation)

Sagittarius is one of the constellations of the zodiac.

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Spectral line

A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.

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Star

A star is a luminous sphere of plasma held together by its own gravity.

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References

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

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