Nu2 Coronae Borealis

{{Short description|Red giant star in the constellation Corona Borealis}}

{{other stars by Bayer designation|Nu Coronae Borealis{{!}}ν Coronae Borealis}}

{{Starbox begin

| name = ν² Coronae Borealis

}}

{{Starbox image

| image = 250px

| caption = ν² Coronae Borealis (lower red star) in optical light

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Corona Borealis

| ra = {{RA|16|22|29.21832}}

| dec = {{DEC|+33|42|12.5247}}

| appmag_v = +5.396

}}

{{Starbox character

| type = RGB

| class = K5 III

| b-v = +1.525

| u-b = +1.787

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|-41.1|0.2}}

| prop_mo_ra = −5.537

| prop_mo_dec = +49.931

| parallax = 5.7163

| p_error = 0.0624

| parallax_footnote =

| absmag_v = −0.78

}}

{{Starbox detail

| source =

| mass = 1.1

| radius = 64

| luminosity = 880

| temperature = 3,940

| gravity = 1.76

| metal_fe = −0.16

| rotational_velocity = 3.1

| age_myr =

}}

{{Starbox catalog

| names = {{odlist | B=ν² Coronae Borealis | F=21 CrB | BD=+34 2774 | FK5= | HD=147767 | HIP=80214 | HR=6108 | SAO=65259 }}

}}

{{Starbox reference

| Simbad = nu02+CrB

}}

Nu² Coronae Borealis is a solitary, orange-hued star located in the northern constellation of Corona Borealis. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.4. Based upon an annual parallax shift of {{val|5.72|ul=mas}}, it is located roughly 571 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.1 due to interstellar dust.

This is an evolved red giant star with a stellar classification of K5 III. The measured angular diameter of Nu² Coronae Borealis is {{Val|2.53|0.16|u=mas}}. At its estimated distance, this yields a physical size of about 64 times the radius of the Sun. Nu² Coronae Borealis is radiating 880 times the Sun's luminosity from its photosphere at an effective temperature of 3,940 K.

The star ν¹ Coronae Borealis lies {{val|6|ul='}} borth of ν². ν¹ is also a red giant with almost the same apparent magnitude, but is a more luminous asymptotic giant branch star.

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{{cite simbad | mode=cs2

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}}

Category:K-type giants

Category:Corona Borealis

Corona Borealis, Mu

Category:Durchmusterung objects