Epsilon Arietis

{{Short description|Binary star system in the constellation Aries}}

{{Starbox begin

| name = ε Arietis

}}

{{Starbox image

| image=

{{Location mark

|image=Aries constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=ε Arietis

|x=416|y=424

}}

|caption=Location of ε Arietis (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|02|59|12.726}}

| dec = {{DEC|+21|20|25.54}}

| appmag_v = 4.63 (5.2/5.5)

| constell = Aries

}}

{{Starbox character

| class = {{nowrap|A2 Vs + A2 Vs}}

| r-i = 0.02{{cn|date=May 2025}}

| v-r =

| b-v = +0.04

| u-b = +0.08

| variable =

}}

{{Starbox astrometry

| radial_v = +0.9{{±|0.9}}

| prop_mo_ra = −15.884

| prop_mo_dec = −7.151

| pm_footnote =

| parallax = 9.0296

| p_error = 0.1851

| parallax_footnote =

| absmag_v =

}}

{{Starbox orbit

| reference =

| period = {{val|704.111|1.778}}

| axis = {{val|2.174|0.035}}

| eccentricity = {{val|0.317|0.006}}

| inclination = {{val|84.2|0.8}}

| node = {{val|25.6|0.7}}

| periastron = {{val|704.111|1.778}}

| periarg = {{val|162.1|1.0}}

}}

{{Starbox detail

| component1 = ε Ari A

| mass = 2.4

| radius =

| luminosity =

| temperature =

| metal_fe =

| rotational_velocity = 60

| age_myr =

| component2 = ε Ari B

| mass2 = 2.4

| rotational_velocity2= 60

}}

{{Starbox catalog

| names = {{odlist | F=48 Arietis | ADS=2257 | BD=+20 484 | HIP=13914 | WDS=J02592+2120AB }}

| component1 = ε Ari A

| names1 = {{odlist | HD=18520 | HR=888 | SAO=75673 | GC=3582 | PPM=92122 }}

| component2 = ε Ari B

| names2 = HD 18519, HR 887

}}

{{Starbox reference

| Simbad = eps+Ari | sn = ε Ari

| Simbad2 = eps+Ari+A | sn2 = ε Ari A

| Simbad3 = eps+Ari+B | sn3 = ε Ari B

}}

Epsilon Arietis is a visual binary star system in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ε Arietis, and abbreviated Epsilon Ari or ε Ari. This system has a combined apparent visual magnitude of 4.63 and can be seen with the naked eye, although the two components are too close together to be resolved without a telescope. With an annual parallax shift of {{val|9.03|ul=mas}}, the distance to this system can be estimated as {{Convert|361|ly|pc|abbr=off|lk=on}}, give or take a 7 light-year margin of error. It is located behind the dark cloud MBM12.

The brighter member of this pair has an apparent magnitude of 5.2. At an angular separation of {{val|1.426|0.010|u=arcsecond}} from the brighter component, along a position angle of {{val|209.2|0.3|u=°}}, is the magnitude 5.5 companion. Both are A-type main sequence stars with a stellar classification of A2 Vs. (The 's' suffix indicates that the absorption lines in the spectrum are distinctly narrow.) In the 2009 Catalogue of Ap, HgMn and Am stars, the two stars have a classification of A3 Ti, indicating they are Ap stars with an anomalous abundance of titanium. Within the measurement margin of error, their projected rotational velocities are deemed identical at 60 km/s.

Name

This star system, along with δ Ari, ζ Ari, π Ari, and ρ³ Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of Al Baṭn, the Belly. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were the title for five stars :δ Ari as Botein, π Ari as Al Buṭain I, ρ³ Ari as Al Buṭain II, ε Ari as Al Buṭain III and ζ Ari as Al Buṭain IV

In Chinese astronomy, Epsilon Arietis may be or may be part of Tso Kang (from Cantonese {{lang|zh|左更}} zogang, Mandarin pronunciation zuǒgēng).Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIII^e siecle", Annales de l'Observatoire Astronomique de Zô-Sé.{{lang|zh|伊世同}} (Yi Shi Tong) (1981): {{lang|zh|『中西対照恒星図表』科学出版社}}.{{in lang|zh}}

References

{{reflist|refs=

{{citation

| title=Orbital Elements for BU 741 AB, STF 333 AB, BU 920 and R 207

| last=Rica | first=Francisco | postscript=.

| journal=Journal of Double Star Observations

| volume=8 | issue=2 | pages=127–139 | date=April 2012

| bibcode=2012JDSO....8..127R }}

{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | arxiv=0708.1752 | s2cid=18759600 | postscript=. }}

{{citation | postscript=.

| title=Speckle observations with PISCO in Merate - III. Astrometric measurements of visual binaries in 2005 and scale calibration with a grating mask

| display-authors=1 | last1=Scardia | first1= M.

| last2=Prieur | first2=J.-L. | last3=Pansecchi | first3=L.

| last4=Argyle | first4=R. W. | last5=Basso | first5=S.

| last6=Sala | first6=M. | last7=Ghigo | first7=M.

| last8=Koechlin | first8=L. | last9=Aristidi | first9=E.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=374 | issue=3 | pages=965–978 | date=January 2007

| doi=10.1111/j.1365-2966.2006.11206.x | doi-access=free

| bibcode=2007MNRAS.374..965S | access-date=2025-05-04

| url=https://hal.archives-ouvertes.fr/hal-00288211/file/scard06_MerIII.pdf }}

{{citation | last=Gontcharov | first=G. A. | 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 |date=November 2006 | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G | postscript=. |arxiv = 1606.08053 | s2cid=119231169 }}

{{citation | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 |date=October 2002 | doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255 | s2cid=14070763 | postscript=. }}

{{citation | last=Eggen | first=Olin J. | title=Luminosities, colors, and motions of the brightest A-type stars | journal=Astronomical Journal | volume=68 | page=697 |date=November 1963 | doi=10.1086/109198 | bibcode=1963AJ.....68..697E | postscript=. }}

{{citation | last1=Renson | first1=P. | last2=Manfroid | first2=J. | title=Catalogue of Ap, HgMn and Am stars | journal=Astronomy and Astrophysics | volume=498 | issue=3 | pages=961–966 |date=May 2009 | doi=10.1051/0004-6361/200810788 | bibcode=2009A&A...498..961R | postscript=. | doi-access=free }}

{{citation | postscript=.

| title=Star Names: Their Lore and Meaning

| last=Allen | first=R. H. | author-link=Richard Hinckley Allen

| year=1963 | page=83 | edition=Reprint

| publisher=Dover Publications Inc

| location=New York, NY | isbn=((0-486-21079-0))

| url=https://archive.org/details/starnamestheirlo00alle/page/83

| access-date=2010-12-12

| url-access=registration }}

{{citation | postscript=.

| title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars

| first=Jack W. | last=Rhoads | date=November 15, 1971

| publisher=Jet Propulsion Laboratory, California Institute of Technology

| url=https://ntrs.nasa.gov/citations/19720005197

| access-date=2025-05-04 }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%20887 HR 887]
[http://aladin.u-strasbg.fr/AladinPreview?-c=SV*+ZI+++167&ident=SV*+ZI+++167&submit=Aladin+previewer Image Epsilon Arietis]

Category:A-type main-sequence stars

Category:Double stars

Category:Aries (constellation)

Arietis, Epsilon

0887

Category:Durchmusterung objects

Arietis, 48

018519

013914