27 Arietis

{{Short description|Star in the constellation Aries}}

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Aries

| ra = {{RA|02|30|54.39715}}

| dec = {{DEC|+17|42|13.8908}}

| appmag_v = 6.21

}}

{{Starbox character

| class = {{nowrap|G8 III-IV Fe-2}}

| b-v = {{Val|0.908|0.002}}

| u-b =

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−122.71|0.28}}

| prop_mo_ra = +33.774

| prop_mo_dec = −82.912

| parallax = 11.6403

| p_error = 0.1172

| parallax_footnote =

| absmag_v = 1.48

}}{{Starbox orbit

| reference =

| period_unitless = {{Val|130.706|0.008|u=days}}

| eccentricity = {{Val|0.366|0.007}}

| periastron = {{Val|53480.1|0.4|fmt=commas|ul=MJD}}

| periarg = {{Val|275.5|0.7}}

| k1 = {{Val|5.98|0.05}}

}}

{{Starbox detail

| mass = 1.29

| radius = {{Val|7.04|0.29|0.28}}

| luminosity = 28.43

| temperature = {{Val|4788|49|fmt=commas}}

| metal_fe = {{Val|−0.65|0.02}}

| gravity = {{Val|2.77|0.21}}

| rotational_velocity = 1.6

| age_gyr = 5.44

}}

{{Starbox catalog

| names = {{odlist | F=27 Ari | BD=+17°380 | FK5=1069 | HD=15596 | HIP=11698 | HR=731 | SAO=92983 }}

}}

{{Starbox reference

| Simbad = 27+Ari

}}

{{Starbox end}}

27 Arietis is a binary star system in the northern constellation of Aries. 27 Arietis is the Flamsteed designation. It is a dim, yellow-hued star that is close to the lower limit of what can be viewed with the naked eye, having an apparent visual magnitude is 6.21. The annual parallax shift of {{Val|11.64|0.12|ul=mas}} corresponds to a physical distance of approximately {{Convert|280|ly|pc|abbr=off|lk=on}} from Earth. It is advancing closer to the Earth with a heliocentric radial velocity of −122.7 km/s, and may come as close as {{Convert|25.85|pc|ly|0|disp=out|abbr=off}} in around 643,000 years.

This appears to be a single-lined spectroscopic binary system with an orbital period of 130.7 days and an eccentricity of 0.366. It has an "a sin i" value of {{Convert|10.00|±|0.08|Gm|AU|lk=on|abbr=on}}, where a is the semimajor axis and i is the inclination to the line of sight from the Earth. This value provides a lower bound on the actual semimajor axis. The visible component has a stellar classification of {{nowrap|G8 III-IV Fe-2}}, displaying mixed spectral traits of an evolved subgiant and a giant star, with a strong underabundance of iron. The CN bands of this star are very weak.