29 Orionis

{{about-distinguish2|e Orionis|ε (epsilon) Orionis}}

{{short description|Aging giant star in the constellation of Orion}}

{{Starbox begin

| name = 29 Orionis

}}

{{Starbox image

|image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=29 Orionis

|x=663|y=733

}}

|caption=Location of 29 Orionis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Orion

| ra = {{RA|05|23|56.82768}}{{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%2025247 Vizier catalog entry]

| dec = {{DEC|-7|48|29.0332}}

| appmag_v = 4.13{{cite journal|author=Takeda, Yoichi|author2=Sato, Bun'ei|author3=Murata, Daisuke|date=2008|title=Stellar Parameters and Elemental Abundances of Late-G Giants|journal=Publications of the Astronomical Society of Japan|volume=60|issue=4|pages=781–802 |arxiv = 0805.2434 |bibcode = 2008PASJ...60..781T |doi = 10.1093/pasj/60.4.781 |s2cid=16258166}}

}}

{{Starbox character

| class = G8IIIFe-0.5{{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 = +0.96{{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 }}

| u-b = +0.70

}}

{{Starbox astrometry

| radial_v = −17.68{{cite journal | arxiv=1410.6422 | bibcode=2015A&A...574A..50J | doi=10.1051/0004-6361/201424474 | title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets | journal=Astronomy & Astrophysics | volume=574 | pages=A50 | year=2015 | last1=Jofré | first1=E. | last2=Petrucci | first2=R. | last3=Saffe | first3=C. | last4=Saker | first4=L. | last5=Artur de la Villarmois | first5=E. | last6=Chavero | first6=C. | last7=Gómez | first7=M. | last8=Mauas | first8=P. J. D. | s2cid=53666931 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/574/A50/stars&Name=HD%2035369 Vizier catalog entry]

| prop_mo_ra = −14.82

| prop_mo_dec = −45.02

| parallax = 20.73

| p_error = 0.17

| parallax_footnote =

| absmag_v = 0.73{{cite journal | bibcode=2015A&A...580A..24D | doi=10.1051/0004-6361/201525770 | title=Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets | journal=Astronomy & Astrophysics | volume=580 | pages=A24 | year=2015 | last1=Da Silva | first1=Ronaldo | last2=Milone | first2=André de C. | last3=Rocha-Pinto | first3=Helio J. | arxiv=1505.01726 | s2cid=119216425 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/580/A24/stars&Name=HD35369 Vizier catalog entry]

}}

{{Starbox detail

| source = {{Citation |last1=Gallenne |first1=A. |last2=Pietrzyński |first2=G. |last3=Graczyk |first3=D. |last4=Nardetto |first4=N. |last5=Mérand |first5=A. |last6=Kervella |first6=P. |last7=Gieren |first7=W. |last8=Villanova |first8=S. |last9=Mennickent |first9=R. E. |last10=Pilecki |first10=B. |date=2018-08-01 |title=Fundamental properties of red-clump stars from long-baseline H-band interferometry |journal=Astronomy & Astrophysics |arxiv=1806.09572 |language=en |volume=616 |pages=A68 |doi=10.1051/0004-6361/201833341 |bibcode=2018A&A...616A..68G |issn=0004-6361}}

| mass = {{val|1.82|0.08}}

| radius = {{val|11.53|0.09}}

| temperature = {{val|4920|20|fmt=commas}}

| luminosity = {{val|70|1}}

| rotational_velocity = 1.1{{cite journal | bibcode=2014A&A...561A.126D | doi=10.1051/0004-6361/201220762 | arxiv=1312.3474 | title=A catalog of rotational and radial velocities for evolved stars | journal=Astronomy & Astrophysics | volume=561 | pages=A126 | year=2014 | last1=De Medeiros | first1=J. R. | last2=Alves | first2=S. | last3=Udry | first3=S. | last4=Andersen | first4=J. | last5=Nordström | first5=B. | last6=Mayor | first6=M. | s2cid=54046583 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/561/A126/table1&HD=35369 Vizier catalog entry]

| gravity = {{val|2.76|0.21}}

| metal_fe = {{val|-0.18|0.02}}

| age_gyr = {{val|1.42|0.12}}

}}

{{Starbox catalog

| names = {{odlist | B=e Ori | F=29 Ori | BD=−07°1064 | GC=6646 | HD=35369 | HIP=25247 | HR=1784 | SAO=132067 }}{{cite simbad | title=e Ori | access-date=2019-06-19 }}

}}

{{Starbox reference

| Simbad = e+Ori

}}

{{Starbox end}}

29 Orionis is a single{{cite journal | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }} star located around 157 light years away from the Sun in the equatorial constellation of Orion. In Bayer's Uranometria, this star is one of two stars (the other being Upsilon Orionis) marking the top of Orion's right boot.{{cite book | last = Wagman | first = Morton | date = 2003 | title = Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others | publisher = The McDonald & Woodward Publishing Company | location = Blacksburg, VA | isbn = 978-0-939923-78-6 |page=513}} It has the Bayer designation e Orionis, while 29 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.13. It is moving closer to the Earth with a heliocentric radial velocity of -18 km/s.

This is an aging giant star with a stellar classification of G8IIIFe-0.5, having exhausted the supply of hydrogen at its core and evolved away from the main sequence. The suffix notation indicates a mild underabundance of iron in the spectrum. It is a red clump giant,{{cite journal | last1=Alves | first1=David R. | title=K-Band Calibration of the Red Clump Luminosity | journal=The Astrophysical Journal | volume=539 | issue=2 | pages=732–741 | date=August 2000 | doi=10.1086/309278 | bibcode=2000ApJ...539..732A | arxiv=astro-ph/0003329 | s2cid=16673121 }} which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star is 1.42 billion years old, has 1.82 times the mass of the Sun and has expanded to 11.53 times the Sun's radius. It is radiating 70 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,920 K.