HD 196775
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HD 196775 (HR 7899) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.98, allowing it to be faintly seen with the naked eye. The object is relatively far at a distance of 1,050 light years but is approaching the Solar System with a heliocentric radial velocity of Template:Val. HD 196775 has a high peculiar velocity of Template:Val[1] compared to neighboring stars, indicating that it may be a runaway star.
HD 196775 has a general stellar classification of B3 V,[2] indicating that it is an ordinary B-type main-sequence star. However, once source gives it a class of B4 Vn,[3] making it slightly cooler and having broad absorption lines due to rapid rotation. It has an angular diameter of Template:Val,[4] yielding a radius 4.13 times that of the Sun.[5] At present it has 7 times the mass of the Sun[1] and shines at Template:Val[6] from its photosphere at an effective temperature of Template:Val,[7] giving it a whitish blue hue. HD 196775 is 36 million years old[1] and is spinning rapidly with a projected rotational velocity of Template:Val.[8]
HD 196775 has four faint optical companions whose parameters are listed below.
| Companion | mv | PA (°) | Year | Sep. (″) |
|---|---|---|---|---|
| B | 12.40 | 154 | 2006 | 5.2 |
| C | 11.31 | 122 | 2012 | 39.9 |
| D | 14.40 | 146 | 2012 | 28.8 |
| E | 14.40 | 33 | 2012 | 23.3 |
References
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