BD+60°2522

{{short description|Star in the constellation Cassiopeia}}

{{Starbox begin

| name=BD+60°2522}}

{{Starbox image

| image = 280px

| caption = NGC 7635 surrounding BD+60 2522

| credit = NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|23|20|44.5135}}

| dec={{DEC|+61|11|40.531}}

| appmag_v=8.67{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}

| constell=Cassiopeia

}}

{{Starbox character

| class=O6.5(f)(n)p{{cite journal|bibcode=2010AJ....139.1283W|arxiv=1001.4032|title=The Onfp Class in the Magellanic Clouds|journal=The Astronomical Journal|volume=139|issue=3|pages=1283|last1=Walborn|first1=Nolan R. | author1-link=Nolan R. Walborn |last2=Howarth|first2=Ian D.|last3=Evans|first3=Christopher J.|last4=Crowther|first4=Paul A.|last5=Moffat|first5=Anthony F. J.|last6=St-Louis|first6=Nicole|last7=Fariña|first7=Cecilia|last8=Bosch|first8=Guillermo L.|last9=Morrell|first9=Nidia I.|last10=Barbá|first10=Rodolfo H.|last11=Van Loon|first11=Jacco Th.|year=2010|doi=10.1088/0004-6256/139/3/1283|s2cid=119297513}}

| b-v=+0.41

| u-b=−0.62

| variable=

}}

{{Starbox astrometry

| radial_v=−26{{cite journal|bibcode=1953GCRV..C......0W|title=General Catalogue of Stellar Radial Velocities|publisher=Carnegie Institution of Washington|last1=Wilson|first1=Ralph Elmer|journal=Carnegie Institute Washington D.C. Publication|year=1953|isbn=9780598216885|lccn=54001336 }}

| prop_mo_ra=−2.662

| prop_mo_dec=0.388

| parallax=0.3341

| p_error=0.0152

| parallax_footnote={{cite Gaia DR3|2014149897293278848}}

| dist_pc=

| absmag_v=−5.5{{Cite journal | last1 = Moore | first1 = B. D. | last2 = Walter | first2 = D. K. | last3 = Hester | first3 = J. J. | last4 = Scowen | first4 = P. A. | last5 = Dufour | first5 = R. J. | last6 = Buckalew | first6 = B. A. | doi = 10.1086/344596 | title = Hubble Space Telescope Observations of the Windblown Nebula NGC 7635 | journal = The Astronomical Journal | volume = 124 | issue = 6 | pages = 3313 | year = 2002 | bibcode = 2002AJ....124.3313M | s2cid = 117009444 }}

}}

{{Starbox detail

| source={{Cite journal | last1 = Rauw | first1 = G. | last2 = De Becker | first2 = M. | last3 = Vreux | first3 = J. -M. | title = Line profile variability in the spectra of Oef stars | doi = 10.1051/0004-6361:20021776 | journal = Astronomy and Astrophysics | volume = 399 | pages = 287–296 | year = 2004 | bibcode = 2003A&A...399..287R | arxiv = astro-ph/0408253 }}

| mass=44

| radius=15

| luminosity=398,000

| temperature=37,500

| metal=

| rotational_velocity=178 - 240

| age_myr=2

}}

{{Starbox catalog

| names=SAO 20575 IRAS 23185+6055 2MASS J23204452+6111404 }}

{{Starbox reference |

Simbad=SAO+20575}}

{{Starbox end}}

BD+60°2522 is a bright O-type star that has produced the Bubble Nebula (NGC 7635) with its stellar wind. The exact classification of the star is uncertain, with a number of spectral peculiarities and inconsistencies between the appearance of the star itself and the effects on the nearby nebulosity, but it is undoubtedly a highly luminous hot massive star. Direct spectroscopy yields a spectral class of O6.5 and an effective temperature around {{val|37,500|fmt=commas|ul=K}}. It is a member of the Cassiopeia OB2 stellar association in the Perseus Arm{{cite journal|bibcode=2009BASI...37....1A|arxiv=0903.2828|title=Study of Bubble nebula using IUE high resolution spectra|journal=Bulletin of the Astronomical Society of India|volume=37|pages=1|last1=Anand|first1=M. Y.|last2=Kagali|first2=B. A.|last3=Murthy|first3=Jayant|year=2009|issue=1}} of the galaxy at about 8,500 light-years' distance.{{cite journal|bibcode=2009AJ....137.3358M|title=The High Angular Resolution Multiplicity of Massive Stars|journal=The Astronomical Journal|volume=137|issue=2|pages=3358|last1=Mason|first1=Brian D.|last2=Hartkopf|first2=William I.|last3=Gies|first3=Douglas R.|last4=Henry|first4=Todd J.|last5=Helsel|first5=John W.|year=2009|doi=10.1088/0004-6256/137/2/3358|arxiv = 0811.0492 |s2cid=119268845}}

Although BD+60°2522 is around two million years old, the surrounding nebula is apparently only about 40,000 years old. The bubble is expected to be formed as a shock front where the stellar wind meets interstellar material at supersonic speeds. The wind from BD+60°2522 is travelling outwards at 1,800–2,500 km/s, causing the star to lose over a millionth of the mass of the Sun every year.