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4 Andromedae

Star in the constellation Andromeda

Star in the constellation Andromeda

| b-v = 1.436 | u-b =

4 Andromedae, abbreviated 4 And, is a single star in the northern constellation of Andromeda. 4 Andromedae is the Flamsteed designation. It is dimly visible to the naked eye with an apparent visual magnitude of 5.308. Based upon an annual parallax shift of as seen from Earth's orbit, it is located 356 light years away. At this distance, interstellar extinction diminishes the apparent magnitude of 4 And by 0.5326 magnitudes. The star is moving closer with a heliocentric radial velocity of −11 km/s. It has a magnitude 11.7 visual companion at an angular separation of along a position angle of 348°, as of 2002.

At the age of 2.2 billion years, this is an aging giant star with a stellar classification of K5 III, having consumed the hydrogen at its core and evolved away from the main sequence. It has 1.6 times the mass of the Sun and has expanded to 23 times the Sun's radius. The star is radiating 170 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,275 K.

References

| display-authors=1 | title=The PASTEL catalogue: 2016 version

| display-authors=1 | last1=Feuillet | first1=Diane K.

| display-authors=1 | last1=Mason | first1=B. D. | access-date=2015-07-22 | doi=10.1086/323920 | doi-access=free }}

References

  1. {{cite DR3. 1936166725851110656
  2. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal.
  3. "4 And".
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k-type-giants andromeda-(constellation) durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
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