47 Andromedae

{{Short description|Binary star system in the constellation Andromeda}}

{{Starbox begin}}

{{Starbox image

| image=

{{Location mark

|image=Andromeda constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=47 Andromedae

|x=368|y=504

}}

|caption=Location of 47 Andromedae (circled)

}}

{{Starbox observe

| epoch= J2000.0

| constell = Andromeda

| ra = {{RA|01|23|40.6168}}

| dec = {{DEC|+37|42|53.8084}}

| appmag_v = {{nowrap|5.60 (6.33 + 6.38)}}

}}

{{Starbox character

| class = A1m (kA1hF1mF2){{cite journal |bibcode=1995ApJS...99..135A |title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars |last1=Abt |first1=Helmut A. |last2=Morrell |first2=Nidia I. |journal=The Astrophysical Journal Supplement Series |year=1995 |volume=99 |page=135 |doi=10.1086/192182 |doi-access=free }}

| b-v = 0.276

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+13.3|0.9}}

| prop_mo_ra = {{val|81.773|0.225}}

| prop_mo_dec = {{val|−19.592|0.226}}

| parallax = 15.9805

| p_error = 0.1578

| parallax_footnote =

| absmag_v = {{Val|2.30|0.06}}/{{val|2.35|0.06}}

}}

{{Starbox orbit

| reference =

| period_unitless = {{Val|35.36815|0.00015|fmt=commas|u=days}}

| eccentricity = {{Val|0.64781|0.00090}}

| inclination = 38

| periastron ={{nowrap|2,454,293.2187 ± 0.0056 HJD}}

| k1 = {{Val|39.216|0.079}}

| k2 = {{Val|40.47|0.073}}

}}

{{Starbox detail

| source =

| component1 = 47 And A

| mass = 1.65

| radius = {{Val|1.9|0.1}}

| luminosity = {{Val|9.0|0.5}}

| temperature =

| gravity =

| metal_fe =

| rotational_velocity = {{val|15|2}}

| age_myr = 710

| component2 = 47 And B

| radius2 = {{Val|1.8|0.1}}

| luminosity2 = {{Val|8.6|0.5}}

| rotational_velocity2 = {{val|15|2}}

}}

{{Starbox catalog

| names = {{odlist | F=47 And | BD=+36°237 | FK5=2093 | HD=8374 | HIP=6514 | HR=395 | SAO=54655 | PPM=66233 }}{{cite simbad | title=47 And | access-date=2018-02-22 }}

}}

{{Starbox reference

| Simbad=47+And

}}

{{Starbox end}}

47 Andromedae is a binary star system in the northern constellation of Andromeda. The designation is from the star catalogue of John Flamsteed, first published in 1712. The system has a combined apparent visual magnitude of 5.60, which is just bright enough to be faintly visible to the naked eye under good seeing conditions. The distance to this system, as determined from an annual parallax shift of 15.9805 mas, is about 204 light years. It is moving away from the Sun with a heliocentric radial velocity of +13.3 km/s.

The binary nature of this system was discovered by John Stanley Plaskett and Reynold Kenneth Young in 1919 using radial velocity measurements taken from Photographic plates obtained at Dominion Astrophysical Observatory in Saanich, British Columbia, Canada. It is a double-lined spectroscopic binary with an orbital period of 35.4 days and an eccentricity of 0.65. The components appear to be nearly identical Am stars, with a magnitude difference of 0.05. The combined stellar classification is A1m.