Epsilon Equulei

{{Short description|Star in the constellation Equuleus}}

{{Starbox begin

|name = ε EquuleiAB

}}

{{Starbox observe

|epoch = J2000

|ra = {{RA|20|59|04.47539}}{{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid=18759600}}

|dec = {{DEC|+04|17|36.5211}}

|appmag_v = 5.23{{cite simbad|title=* eps Equ|accessdate=8 July 2017}} (5.96 / 6.31){{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|work=United States Naval Observatory|access-date=8 July 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}

|constell = Equuleus

}}

{{Starbox character

|class = F5(V) + F6(V){{cite journal|bibcode=1980ApJS...44..489B|doi=10.1086/190702|title=Scanner studies of composite spectra. I - Dwarfs|journal=The Astrophysical Journal Supplement Series|volume=44|pages=489|year=1980|last1=Beavers|first1=W. I.|last2=Cook|first2=D. B.|doi-access=free}}

|b-v = +0.47{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|pages=0|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}}

|u-b = +0.00

|variable =

}}

{{Starbox astrometry

|radial_v = 8.20 ± 0.2{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053|s2cid=119231169}}

|prop_mo_ra = -115.75

|prop_mo_dec = -151.70

|parallax = 18.49

|p_error = 1.35

|parallax_footnote=

|absmag_v = +1.65{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

}}

{{Starbox orbit

|reference =

|period = 101.485

|axis = 0.6474

|inclination = 92.17

|node = 105.15

|periastron = 1920.37

|eccentricity= 0.705

|periarg = 340.19

}}

{{Starbox detail

| component1 = A

| mass = 1.74{{cite web|url=http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HR&number=8034|title=Multiple Star Catalog|access-date=2018-11-28|archive-date=2018-11-29|archive-url=https://web.archive.org/web/20181129013226/http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HR&number=8034|url-status=dead}}

| radius =

| luminosity =

| temperature = 6,223{{cite journal|bibcode=2015AJ....150...88L|title=Abundances in the Local Region. I. G and K Giants|journal=The Astronomical Journal|volume=150|issue=3|pages=88|last1=Luck|first1=R. Earle|year=2015|arxiv=1507.01466|doi=10.1088/0004-6256/150/3/88|s2cid=118505114}}

| metal_fe =

| gravity = 3.87

| rotational_velocity=

| component2 = B

| mass2 = 1.53

| temperature2 = 6,399

| gravity2 = 4.29

| age_gyr2 = 1.5{{cite journal|bibcode=2011A&A...530A.138C|title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey|journal=Astronomy and Astrophysics|volume=530|pages=A138|last1=Casagrande|first1=L.|last2=Schönrich|first2=R.|last3=Asplund|first3=M.|last4=Cassisi|first4=S.|last5=Ramírez|first5=I.|last6=Meléndez|first6=J.|last7=Bensby|first7=T.|last8=Feltzing|first8=S.|author8-link= Sofia Feltzing |year=2011|arxiv=1103.4651|doi=10.1051/0004-6361/201016276|s2cid=56118016}}

}}

{{Starbox catalog

|names = ε Equ, 1 Equulei, HD 199766, HIP 103569, HR 8034, SAO 126428, BD+03°4473

}}

{{Starbox reference

|Simbad = eps+Equ

}}

{{Starbox end}}

Epsilon Equulei, Latinized from ε Equulei, is a star system of apparent magnitude +5.23 in the constellation of Equuleus. It is located 180 light years away from the Solar System, based on its parallax.