}}{{Starbox reference
| Simbad = HD+3346
}}{{Starbox end}}HD 3346, also known as V428 Andromedae, is a binary star[21] system in the northern constellation of Andromeda. It is a dim star but visible to the naked eye under suitable viewing conditions, having an apparent visual magnitude of 5.14.[6] The distance to HD 3346 can be determined from its annual parallax shift of {{Val|4.95|ul=mas}}.[1] This yields a range of about 660 light year. At that distance the brightness of the system is diminished by an extinction of 0.16 magnitude due to interstellar dust.[8] It is moving closer to the Earth with a heliocentric radial velocity of −33 km/s.[8]Binary system
This is a single-lined spectroscopic binary system with an orbital period of 576 days and an eccentricity of 0.3. The a sin i value for the primary is {{Convert|5.1|+/-|0.6|Gm|AU|lk=on|abbr=on}}, where a is the semimajor axis and i is the (unknown) orbital inclination. The provides a minimum value for the actual semimajor axis.[13]
The visible component is a red giant star and has been defined as a standard star for the stellar classification of K6 IIIa.[4] Prior to that there had been no spectral standard for K6 giants and HD 3346 had been classified between K5 III and M0 III.[28]
Variability
V428 Andromedae is the variable star designation for HD 3346. It is a short-period semi-regular variable (type SRS),[3] also called an ultra-small-amplitude pulsating red giant.[30] It has an amplitude of only 0.065 magnitudes.[30] The main pulsation period is 11.5 days, but other periods of 11, 15, and 22 days have been detected.[32][30]
Possible planetary system
In 1996 it was announced that the variations in radial velocity of this star were larger than expected. A planetary system was proposed to explain this variation.[34][35]
{{OrbitboxPlanet begin}}{{OrbitboxPlanet hypothetical
| exoplanet = b
| mass = 10
| semimajor = 0.3
| period = 30.0
| eccentricity = 0
}}{{OrbitboxPlanet hypothetical
| exoplanet = c
| mass = 60
| semimajor = 2.5
| period = 650
| eccentricity = 0.00
}}{{Orbitbox end}}References
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