10 Lacertae

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

{{Starbox begin

|name= 10 Lacertae

}}

{{Starbox image

| image=

{{Location mark

|image=Lacerta constellation map.svg

|float=center

|alt=

|label=

|position=right

|width=260

|mark=Red circle.svg

|mark_width=10

|mark_link=10 Lacertae

|x=422|y=993

}}

|caption=Location of 10 Lac (circled)

}}

{{Starbox observe

| epoch = J2000

|constell= Lacerta

|ra= {{RA|22|39|15.67804}}

|dec= {{DEC|+39|03|00.9724}}

|appmag_v=4.880{{cite journal | last1=Oja | first1=T. | title=UBV photometry of stars whose positions are accurately known. VII | journal=Astronomy and Astrophysics Supplement Series | issn=0365-0138 | volume=100 | number=3 | pages=591–592 | date=September 1993 | bibcode=1993A&AS..100..591O }}

}}

{{Starbox character

| class = O9V{{cite journal|bibcode=2011ApJS..193...24S

|title=The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500|journal=The Astrophysical Journal Supplement|volume=193|issue=3|pages=24|author1=Sota, A.|author2=Maíz Apellániz, J.|author3=Walborn, N. R.|author4=Alfaro, E. J.|author5=Barbá, R. H.|author6=Morrell, N. I.|author-link6=Nidia Morrell|author7=Gamen, R. C.|author8=Arias, J. I.|arxiv = 1101.4002 |doi = 10.1088/0067-0049/193/2/24 |year=2011|s2cid=119248206}}

| b-v = −0.210

| u-b = −1.010

| variable = β Cep?{{cite journal|bibcode=2009yCat....102025S|date=January 2009|title=VizieR On-line Data Catalog: General Catalogue of Variable Stars|journal=VizieR On-line Data Catalog|author1=Samus, N. N.|author2=Durlevich, O. V.}}

}}

{{Starbox astrometry

| radial_v = −10.10{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}

| prop_mo_ra = {{val|-1.274}}

| prop_mo_dec = {{val|-5.605}}

| pm_footnote =

| parallax = 2.192

| p_error = 0.131

| parallax_footnote = {{cite DR3|1908095850396090880}}

| dist_pc = {{val|552|32}}

| dist_ly = {{val|{{convert|552|pc|ly|disp=number}}|{{convert|32|pc|ly|disp=number}}|fmt=commas}}

| dist_footnote =

| absmag_v = {{val|-4.17|0.12}}

}}

{{Starbox detail

| source = {{Cite journal |last1=Aschenbrenner |first1=P. |last2=Przybilla |first2=N. |last3=Butler |first3=K. |date=2023-03-01 |title=Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method |bibcode=2023A&A...671A..36A |arxiv=2301.09462 |journal=Astronomy and Astrophysics |volume=671 |pages=A36 |doi=10.1051/0004-6361/202244906 |issn=0004-6361}}

| mass = {{val|21.6|0.5}}

| radius = {{val|7.4|0.5}}

| luminosity = {{val|69200|8440|7520|fmt=commas}}

| temperature = {{val|34550|300|fmt=commas}}

| gravity = {{val|4.04|0.05}}

| metal_fe =

| rotational_velocity = {{val|14|1}}

| age_myr = {{val|3.55|0.72|0.60}}

}}

{{Starbox catalog

| names = 10 Lac, HR 8622, BD+38°4826, HD 214680, SAO 72575, HIP 111841, NSV 25932, WDS J22393+3903

}}

{{Starbox reference

| Simbad=10+Lacertae

}}

{{Starbox end}}

10 Lacertae (10 Lac) is a star in the constellation Lacerta. With an apparent magnitude of 4.9, it is located around {{convert|550|pc|ly}} distant in the small Lacerta OB1 association. It is a hot blue main-sequence star of spectral type O9V, a massive star that is currently fusing its core hydrogen. It is a suspected Beta Cephei variable star.

It was one of the first O-type stars (along with S Monocerotis) to be defined as an anchor point for the MKK spectral classification; since the early twentieth century it has served as such a point. Specifically, the star is representative of O9V stars, meaning relatively cool O-type stars on the main-sequence.{{cite journal |last1=Garrison |first1=R. F. |title=A Hierarchy of Standards for the MK Process |journal=Astronomical Society of the Pacific |volume=60 |pages=3 |year=1994 |bibcode=1994ASPC...60....3G}}

It is the star with the smallest angular diameter measured by the CHARA array, at {{Val|0.11|0.02|u=milliarcseconds}}.{{Cite journal |last1=Gordon |first1=Kathryn D. |last2=Gies |first2=Douglas R. |last3=Schaefer |first3=Gail H. |last4=Huber |first4=Daniel |last5=Ireland |first5=Michael |last6=Hillier |first6=D. John |date=December 2018 |title=Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array |journal=The Astrophysical Journal |language=en |volume=869 |issue=1 |pages=37 |doi=10.3847/1538-4357/aaec04 |doi-access=free |arxiv=1812.05511 |bibcode=2018ApJ...869...37G |issn=0004-637X}}

10 Lacertae has an 8th magnitude companion about one arc-minute away.{{cite journal|bibcode=1994CoORB.115.....D|author1=Dommanget, J.|author2=Nys, O.|title=Catalogue of the Components of Double and Multiple stars (CCDM). First edition.|journal=Communications de l'Observatoire Royal de Belgique|volume=115|date=1994}}