7 Aquarii

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7 Aquarii, abbreviated 7 Aqr, is a binary star[1] system in the zodiac constellation of Aquarius. 7 Aquarii is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.5;[2] the brighter component is baseline magnitude 5.62 while the faint secondary is magnitude 11.4.[1] As of 2002, the pair had an angular separation of Template:Val along a position angle of 165°.[3] The distance to this system, based upon an annual parallax shift of Template:Val,[4] is around 660 light years. It is moving closer to the Earth with a heliocentric radial velocity of −32 km/s.[5]

The primary component is an aging giant star with a stellar classification of K4 III.[6] It is a suspected variable star of unknown type with a maximum magnitude of 5.48.[7] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is Template:Val,[8] which, at its estimated distance, equates to a physical radius of about 46 times the radius of the Sun.[9] The star is radiating 404[10] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,990 K.[2]

References

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  1. ↑ 1.0 1.1 Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  2. ↑ 2.0 2.1 Cite error: Invalid <ref> tag; no text was provided for refs named McWilliam1990
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WDSC2014
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR2
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov2006
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named houk1978
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Samus2017
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Richichi2005
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named lang2006
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
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