15 Sagittarii

{{Starbox begin

| name = 15 Sagittarii

}}

{{Starbox observe

| epoch = J2000

| constell = Sagittarius

| ra = {{RA|18|15|12.90641}}

| dec = {{DEC|-20|43|41.7738}}

| appmag_v = 5.37

}}

{{Starbox character

| class = O9.7 Iab or B0 Iab

| b-v = {{Val|0.007|0.004}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−6.3|2.8}}

| prop_mo_ra = +1.60

| prop_mo_dec = −1.51

| parallax = 0.10

| p_error = 0.45

| parallax_footnote =

| dist_ly = {{Val|4200|650|fmt=commas}}

| dist_pc = {{Val|1,300|200|fmt=commas}}

| absmag_v =

}}

{{Starbox detail

| source =

| component1 = 15 Sgr Aa

| mass = ~30

| radius = {{Val|28.6|12.5}}

| luminosity = {{Val|4.47|3.85|2.07|e=5|fmt=commas}}

| gravity = 3.10

| temperature = {{Val|28000|1000|fmt=commas}}

| metal_fe =

| rotational_velocity = {{Val|83|7}}

| age_myr =

}}

{{Starbox catalog

| names = {{odlist | F=15 Sgr | BD=-20° 5054 | HD=167264 | HIP=89439 | HR=6822 | SAO=186543 | WDS=J18152-2044 }}

}}

{{Starbox reference

| Simbad = 15+Sgr

}}

15 Sagittarii is a blue-hued binary star system in the southern zodiac constellation of Sagittarius. The estimated distance based upon photometry is around {{Convert|1,300|pc|ly|order=flip|abbr=on}}. It is faintly visible to the naked eye with an apparent visual magnitude of 5.37. The system is moving closer to the Sun with a heliocentric radial velocity of around −6 km/s.

Chini et al. (2012) identify this as a double-lined spectroscopic binary star system. It shows a stellar classification of O9.7 Iab, matching a massive O-type supergiant star. Along with the O-type star 16 Sgr (HD 167263), it is ionizing an H II region along the western edge of the molecular cloud L291.

The Washington Double Star Catalog lists four companions within a 2 arcsecond angular radius.

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Category:O-type supergiants

Category:Spectroscopic binaries

Category:Sagittarius (constellation)

Category:Durchmusterung objects