Editing Meissa (section)

{{Short description|Star in the constellation Orion}} 
{{Starbox begin
 | name = Meissa
}}
{{Starbox image
|image=
{{Location mark
|image=Orion constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=λ
|x=586|y=242
}}
|caption=λ (circled) in the constellation Orion.
}}
{{Starbox observe 2s
 | epoch    = J2000
 | constell = [[Orion (constellation)|Orion]]
 | component1 = A
 | ra1        = {{RA|05|35|08.27608}}<ref name=dr3a/>
 | dec1       = {{DEC|+09|56|02.9913}}<ref name=dr3a/>
 | appmag_v1  = 3.7<ref name=melnik2020/>
 | component2 = B
 | ra2        = {{RA|05|35|08.48130}}<ref name=dr3b/>
 | dec2       = {{DEC|+09|56|06.0995}}<ref name=dr3b/>
 | appmag_v2  = 5.6<ref name=melnik2020/>
}}
{{Starbox character
 | component = A
 | class    = O8 III((f))<ref>{{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=2|pages=24|last1=Sota|first1=A.|last2=Maíz Apellániz|first2=J.|last3=Walborn|first3=N. R.|last4=Alfaro|first4=E. J.|last5=Barbá|first5=R. H.|last6=Morrell|first6=N. I.|last7=Gamen|first7=R. C.|last8=Arias|first8=J. I.|year=2011|doi=10.1088/0067-0049/193/2/24|arxiv = 1101.4002 |s2cid=119248206}}</ref>
 | b-v      = −0.21<ref name=mnras181_657/>
 | u-b      = −1.01<ref name=mnras181_657/>
 | variable = 
}}
{{Starbox character|no_heading=y
 | component = B
 | class    = B0 V<ref name=mnras181_657/>
 | b-v      = +0.04<ref name=mnras181_657/>
 | u-b      = −0.77<ref name=mnras181_657/>
 | variable = 
}}
{{Starbox astrometry
 | radial_v = +30.10<ref>{{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}}</ref>
}}
{{Starbox astrometry|no_heading=y
 | component1 = A
 | prop_mo_ra  = +2.896<ref name=dr3a/>
 | prop_mo_dec = −3.183<ref name=dr3a/>
 | parallax = 2.5936
 | p_error  = 0.4032
 | parallax_footnote = <ref name=dr3a/>
 | absmag_v = −4.25
 | component2 = B
 | prop_mo_ra2  = +2.216<ref name=dr3b/>
 | prop_mo_dec2 = −1.986<ref name=dr3b/>
 | parallax2 = 2.4682
 | p_error2  = 0.1543
 | parallax_footnote2 = <ref name=dr3b/>
 | absmag_v2 = −1.94
}}
{{Starbox detail
 | component1          = A
 | mass                = 34<ref name=voss/>
 | radius              = {{val|10.0|0.6}}<ref name=Gordon2018/>
 | luminosity          = {{val|200,000|117000|74000|fmt=commas}}<ref name=aaa628_A36/>
 | luminosity_bolometric = 
 | luminosity_visual   =   
 | temperature         = {{val|36000|900|fmt=commas}}<ref name=Gordon2018/>
 | metal_fe            = 0.03<ref name=wu/>
 | rotation            =   
 | rotational_velocity =   
 | gravity             = 3.90<ref name=wu/>
 | age_myr             = 4.2<ref name=voss/>
 | component2          = B
 | mass2               = {{val|10.3|0.7}}<ref name=lyubimkov/>
 | radius2             = {{val|4.2|0.8}}<ref name=lyubimkov/>
 | luminosity2         = 6,300<ref name=lyubimkov/>
 | temperature2        = {{val|25,400|500|fmt=commas}}<ref name=lyubimkov>{{cite journal|bibcode=2002MNRAS.333....9L|title=Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars|journal=Monthly Notices of the Royal Astronomical Society|volume=333|pages=9–26|last1=Lyubimkov|first1=Leonid S.|last2=Rachkovskaya|first2=Tamara M.|last3=Rostopchin|first3=Sergey I.|last4=Lambert|first4=David L.|year=2002|issue=1|doi=10.1046/j.1365-8711.2002.05341.x|doi-access=free}}</ref>
 | gravity2            = {{val|4.21|0.10}}<ref name=lyubimkov/>
 | age_myr2            = 1.8<ref name=lyubimkov/>
}}
{{Starbox catalog
 | names=[[Bayer designation|λ Orionis]], [[Flamsteed designation|39 Orionis]], 101&nbsp;G.&nbsp;Orionis, [[Bonner Durchmusterung|BD]]+09°879, [[Hipparcos Catalogue|HIP]]&nbsp;26207, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;112921
 | component1 = A
 | names1 = [[Henry Draper catalogue|HD]]&nbsp;36861, [[Harvard Revised catalogue|HR]]&nbsp;1879
 | component2 = B
 | names2 = HD&nbsp;36862, HR&nbsp;1880
}}
{{Starbox reference
 | Simbad=HIP+26207|sn=λ Ori
 | Simbad2=HD+36861|sn2=A
 | Simbad3=HD+36862|sn3=B
}}
{{Starbox end}}

'''Meissa''' {{IPAc-en|'|m|ai|s|@}}, designated '''Lambda Orionis''' ('''λ Orionis''', abbreviated '''Lambda Ori''', '''λ Ori''') is a [[star]] in the [[constellation]] of [[Orion (constellation)|Orion]].  It is a [[multiple star]] approximately {{val|1,300|ul=ly|fmt=commas}} away with a combined [[apparent magnitude]] of 3.33.<ref name=Ducati2002>{{cite journal |bibcode=2002yCat.2237....0D |title=VizieR Online Data Catalog: Catalogue ofStellar Photometry in Johnson's 11-color system |journal=CDS/ADC Collection of Electronic Catalogues |volume=2237 |last1=Ducati |first1=J. R. |year=2002 }}</ref>  The main components are an O8 [[giant star]] and a B-class [[main sequence]] star, separated by about 4″.  Despite Meissa being more [[bolometric luminosity|luminous]] and only slightly further away than [[Rigel]], it appears 3 [[apparent magnitude|magnitudes]] dimmer at visual wavelengths, with much of its radiation emitted in the [[ultraviolet]] due to its high temperature.