ADS 48

ADS 48 is a multiple star system in the constellation of Andromeda consisting of 7 stars. The components, in order from A to G, have apparent visual magnitudes of 8.83, 9.00, 13.30, 12.53, 11.68, 9.97, and 13.00.

ADS 48A and ADS 48B are in orbital motion around each other while ADS 48F is a common proper motion companion. The others are unassociated background stars.

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ADS

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Tau1 Aquarii

Tau¹ Aquarii (τ¹ Aqr, τ¹ Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 5.66, it is a faint naked eye that requires dark suburban skies for viewing. Parallax measurements made during the Hipparcos mission yield a distance estimate of roughly 320 light-years (98 parsecs) from Earth.

τ¹ Aquarii has a stellar classification of B9 V; right along the borderline between a B- and A-type main sequence star. It is around 100 million years old and has twice the Sun's radius. When examined in the infrared band, it displays an excess emission that is a characteristic of stars with an orbiting debris disk. Indeed, the model that best fits the data suggests there are two concentric circumstellar disks.

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HD 220105

HD 220105 is a star in the northern constellation of Andromeda.

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