28 Andromedae
Template:Location mark Location of 28 Andromedae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.214[2] |
| Characteristics | |
| Spectral type | A7 III[3] |
| U−B Template:Engvar | +0.08[4] |
| B−V Template:Engvar | +0.26[4] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[6] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[7] mas/yr Dec.: Script error: No such module "val".[7] mas/yr |
| Parallax (π) | 16.3540±0.1743 mas[7] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 1.29[8] |
| Details | |
| Mass | 1.77[9] Template:Solar mass |
| Radius | 3.19[7] Template:Solar radius |
| Luminosity | 25.007[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[10] cgs |
| Temperature | Script error: No such module "val".[10] K |
| Metallicity [Fe/H] | Script error: No such module "val".[10] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[11] km/s |
| Age | 1.159[9] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| BD+28°75, HD 2628, HIP 2355, HR 114, SAO 74041, PPM 89834 | |
| Database references | |
| SIMBAD | data |
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28 Andromedae (abbreviated 28 And) is a Delta Scuti variable star in the constellation Andromeda. 28 Andromedae is the Flamsteed designation. It also bears the variable star name GN Andromedae. Its apparent magnitude is 5.214, varying by less than 0.1 magnitudes.
Description
28 Andromedae is an A-type giant star,[3] meaning it is colored bluish-white. Parallax estimates made by the Hipparcos spacecraft put the star at a distance of about 199 light years (61 parsecs).[1] It is moving towards the solar system at a velocity of Script error: No such module "val"..[6]
Multiplicity of the system
Two stars near 28 Andromedae share a common proper motion with the primary star, which is then a candidate triple system. The orbital parameters are currently unknown. The second and third component have masses of Template:Solar mass and Template:Solar mass respectively.[13]
Variability cycle
28 Andromedae A is a Delta Scuti variable, so it displays small luminosity variations at timescales less than a day due to star pulsation. There is evidence for two periodic cycles of 5,014 and 5,900 seconds, respectively. The amplitude variations, though, are not constant in time, and the pulsation modes are not radial.[14]
References
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External links
- Image 28 Andromedae
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