102 Herculis

{{Starbox observe

| epoch = J2000

| constell = Hercules

| ra = {{RA|18|08|45.49142}}

| dec = {{DEC|+20|48|52.4079}}

| appmag_v = 4.37

}}

{{Starbox character

| type =

| class = B2 IV or B2 V

| b-v = {{Val|−0.164|0.013}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−14.9|0.6}}

| prop_mo_ra = −1.92

| prop_mo_dec = −5.89

| parallax = 3.56

| p_error = 0.19

| parallax_footnote =

| absmag_v = −2.87

}}

{{Starbox detail

| source =

| mass = {{Val|9.7|0.2}}

| radius =

| temperature = {{Val|22420|1440|fmt=commas}}

| luminosity = 3,631.92

| gravity = 3.54

| metal_fe =

| rotational_velocity = 41

| age_myr = {{Val|20.0|1.4}}

}}

{{Starbox catalog

| names={{odlist | F=102 Her | BD=+20°3674 | FK5=3443 | HD=166182 | HIP=88886 | HR=6787 | SAO=85769 | WDS=J18088+2049 }}

}}

{{Starbox reference

| Simbad=102+Her

}}

102 Herculis is a single star in the northern constellation of Hercules. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.37. Based upon parallax measurements, it is located around 920 light years away from the Sun. The star is moving closer to the Earth with a heliocentric radial velocity of −15 km/s.

The stellar classification of this object matches a massive, early B-type star with a luminosity class of IV or V, corresponding to a subgiant or main sequence star, respectively. It is 20 million years old with nearly ten times the mass of the Sun and is spinning with a projected rotational velocity of 41 km/s. The strength of the stellar magnetic field has been measured at {{Val|209.5|135.4|e=-4|ul=T}}. The star is radiating 3,632 times the Sun's luminosity from its photosphere at an effective temperature of 22,420 K.

Etymology

In Chinese, {{lang|zh|帛度}} ({{lang|zh-Latn|Bó Dù}}), meaning Textile Ruler, refers to an asterism consisting of 102 Herculis and 95 Her[http://www.ianridpath.com/startales/hercules2.htm Ian Ridpath's Startales - Hercules].Consequently, 102 Herculis itself is known as {{lang|zh|帛度二}} ({{lang|zh-Latn|Bó Dù èr}}, {{langx|en|the Second Star of Textile Ruler}}.)

This star, together with 93 Her, 95 Her, and 109 Her, formed the now obsolete constellation of Cerberus.[http://www.ianridpath.com/startales/cerberus.htm Ian Ridpath's Star Tales - Cerberus]

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Category:B-type subgiants

Category:B-type main-sequence stars

Category:Hercules (constellation)

Category:Durchmusterung objects