42 Orionis

{{Short description|Star in the constellation of Orion}}

{{Starbox begin

| name = 42 Orionis

}}

{{Starbox image

|image=

{{Location mark

|image=Orion constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Map_pointer.svg|mark_width=17|mark_link=42 Orionis

|x=583|y=650

}}

|caption=Location of 42 Orionis (marked red)

}}

{{Starbox observe

| epoch = J2000

| constell = Orion

| ra = {{RA|05|35|23.16427}}{{cite journal | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | last1=Van Leeuwen | first1=F. | s2cid=18759600 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2026237 Vizier catalog entry]

| dec = {{DEC|-4|50|18.0881}}

| appmag_v = 4.59{{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 }}

}}

{{Starbox character

| class = B1V{{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H | volume=5050 | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }}

| b-v = −0.19

| u-b = −0.94

}}

{{Starbox astrometry

| radial_v = +28.40{{Cite journal | doi=10.1134/S1063773706110065 | 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| year=2006| last1=Gontcharov| first1=G. A.|arxiv = 1606.08053 | s2cid=119231169}}

| prop_mo_ra = +4.52

| prop_mo_dec = −7.11

| parallax = 3.69

| p_error = 1.20

| parallax_footnote =

}}

{{Starbox detail

| mass = 12.0{{cite journal | bibcode=2011MNRAS.410..190T | doi=10.1111/j.1365-2966.2010.17434.x | arxiv=1007.4883 | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | pages=190–200 | year=2011 | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | issue=1 | doi-access=free | s2cid=118629873 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/MNRAS/410/190/table1&HIP=26237 Vizier catalog entry]

| radius = 15.6

| luminosity = 10.737

| temperature = 25,400{{cite journal | bibcode=2010AN....331..349H | doi=10.1002/asna.200911355 | arxiv=1003.2335 | title=Masses and luminosities of O- and B-type stars and red supergiants | journal=Astronomische Nachrichten | volume=331 | issue=4 | pages=349 | year=2010 | last1=Hohle | first1=M.M. | last2=Neuhäuser | first2=R. | last3=Schutz | first3=B.F. | s2cid=111387483 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/AN/331/349/single&HIP=26237 Vizier catalog entry]

| rotational_velocity = 20{{cite journal | bibcode=2002ApJ...573..359A | doi=10.1086/340590 | title=Rotational Velocities of B Stars | journal=The Astrophysical Journal | volume=573 | pages=359–365 | year=2002 | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | issue=1 | doi-access=free }}

}}

{{Starbox catalog

| names = c Orionis, BD−04°1185, CCDM J05354-0450AB, GC 6934, HIP 26237, HR 1892, HD 37018, NSV 2318, SAO 132320, WDS J05354-0450AB

}}

{{Starbox reference

| Simbad = 42+Orionis

}}

{{Starbox end}}

File:NGC1977 Running Man Nebula from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block.jpg.]]

42 Orionis, also known as c Orionis or c Ori, is a class B1V (blue main-sequence) star in the constellation Orion. Its apparent magnitude is 4.59 and it is approximately 900 light years away based on parallax.

The primary star, Aa, has one spectroscopic companion Ab of magnitude 6.3 and separation 0.16", and a more distant companion B of 7.5 magnitude at 1.6" separation.{{cite journal | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal=The Astronomical Journal | volume=122 | issue=6 | pages=3466 | year=2001 | last1=Mason | first1=Brian D. | last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I. | last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E. | doi-access=free }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=B/wds/wds&WDS=05354-0450 Vizier catalog entry]{{cite journal | bibcode=2015AJ....150...50T | doi=10.1088/0004-6256/150/2/50 | title=Speckle Interferometry at Soar in 2014 | journal=The Astronomical Journal | volume=150 | issue=2 | pages=50 | year=2015 | last1=Tokovinin | first1=Andrei | last2=Mason | first2=Brian D. | last3=Hartkopf | first3=William I. | last4=Mendez | first4=Rene A. | last5=Horch | first5=Elliott P. |arxiv = 1506.05718 | s2cid=30737411 }}

42 Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. 42 Ori is the star which excites and illuminates NGC 1977.

{{clear left}}