Epsilon Equulei: Difference between revisions

Epsilon Equulei
Observation data; Epoch J2000 Equinox J2000
Constellation	Equuleus
Right ascension	20h 59m 04.47539s
Declination	04° 17′ 36.5211″
Apparent magnitude (V)	5.23 (5.96 / 6.31)
Characteristics
Spectral type	F5III.../F5IV/G0V/?
U−B color index	+0.00
B−V color index	+0.47
Astrometry
Radial velocity (Rv)	8.20 ± 0.2 km/s
Proper motion (μ)	RA: -115.75 mas/yr ; Dec.: -151.70 mas/yr
Parallax (π)	18.49 ± 1.35 mas
Distance	180 ± 10 ly ; (54 ± 4 pc)
Orbit
Period (P)	101.485 yr
Semi-major axis (a)	0.6474″
Eccentricity (e)	0.705
Inclination (i)	92.17°
Longitude of the node (Ω)	105.15°
Periastron epoch (T)	1920.37
Argument of periastron (ω); (secondary)	340.19°
Other designations
	1 Equulei, HD 199766, HIP 103569, HR 8034, SAO 126428, BD+03° 4473
Database references
SIMBAD	data

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Epsilon Equulei (ε Equulei, ε Equ) is a star system of apparent magnitude +5.23^[2] in the constellation of Equuleus . It is located 176 light years away from the Solar System.

Components A and B

These two stars make up the brighter part of the Equulei Epsilon star system. They are called Epsilon Equulei A and B and are subgiants of spectral type of F7IV and F5IV respectively. Epsilon Equulei A has a surface temperature of about 6500 K and its luminosity is 11.1 times that of the Sun. The star measures 2.6 solar radii in radius and has a mass 60% greater than the Sun. Meanwhile, Epsilon Equulei B has a temperature of 6300 K and is 7.8 times more luminous than the Sun Its radius is 2.3 times larger than the Sun, and may have a mass of about 1.55 solar masses.

The orbital period of this binary is 101.5 years. Although the average separation between the two stars is 35 AU, the orbit is remarkably eccentric so that the separation between the two varies between 10 and 60 AU. The last periastron was in 1920 and the next will be in 2121.

Finally, it is thought that Epsilon Equulei A may be, in turn, a spectroscopic binary. The orbital period of the latter would be 2.03 days.

Components C and D

Approximately 10 seconds of arc A,B torque can see a star, though this star makes the second star system called Epsilon Equulei C (HIP 103571 / BD +03 4473C), of magnitude 7.3. Type is a star G0V whose binary separation is equal to or greater than 665 AU, implying an orbital period of over 7500 years.

A fourth star, Epsilon Equulei D (BD +03 4473D), completes the star system. 12.4 magnitude, its separation from the bright AB pair is over 4300 AU.

The system Equulei Epsilon has an approximate age of 2200 million years.

References

^ ^a ^b ^c ^d ^e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
^ ^a ^b "* eps Equ". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 July 2017.
^ ^a ^b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 8 July 2017.
^ ^a ^b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. {{cite journal}}: Cite journal requires |journal= (help)
^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.

[HIP-1] van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.

[SIMBAD-2] "* eps Equ". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 July 2017.

[ORB6-3] "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 8 July 2017.

[EgUBV-4] Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. {{cite journal}}: Cite journal requires |journal= (help)

[Gontcharov-5] Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.

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@@ Line 1: / Line 1: @@
 {{refimprove|date=April 2016}}
 {{Starbox begin
- |name = Epsilon Equulei A/B
+ |name = Epsilon Equulei
 }}
 {{Starbox observe
  |epoch       = J2000
+ |ra          = {{RA|20|59|04.47539}}<ref name=HIP>{{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}}</ref>
- |ra          = {{RA|20|59|04.54}}
- |dec         = {{DEC|04|17|37.8}}
+ |dec         = {{DEC|04|17|36.5211}}<ref name=HIP/>
+ |appmag_v    = 5.23<ref name=SIMBAD>{{cite simbad|title=* eps Equ|accessdate=8 July 2017}}</ref> (5.96 / 6.31)<ref name=ORB6>{{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|accessdate=8 July 2017}}</ref>
- |appmag_v    =
  |constell    = [[Equuleus]]
 }}
 {{Starbox character
  |class       = F5III.../F5IV/G0V/?
+ |b-v         = +0.47<ref name=EgUBV>{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}}</ref>
- |b-v         = 0.46
- |u-b         =
+ |u-b         = +0.00<ref name=EgUBV/>
- |r-i         = 0.20
+ |variable    =
- |variable    = None
 }}
 {{Starbox astrometry
+ |radial_v    = 8.20 ± 0.2<ref name=Gontcharov>{{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}}</ref>
- |radial_v    = 8.2 ± 0.2
- |prop_mo_ra  = -113.43<ref name=wolframalpha />
+ |prop_mo_ra  = -115.75<ref name=HIP/>
- |prop_mo_dec = -150.28<ref name=wolframalpha />
+ |prop_mo_dec = -151.70<ref name=HIP/>
- |parallax    = 18.49 ± 1.35
+ |parallax    = 18.49
+ |p_error     = 1.35
- |parallax_footnote=
+ |parallax_footnote= <ref name=HIP/>
- |dist_ly     = 196.4
- |dist_pc     = 60.21
  |absmag_v    =
 }}
-{{Starbox detail
+{{Starbox orbit
- |mass        = 0.96
+ |reference   = <ref name=ORB6/>
- |radius      = 3.5
+ |period      = 101.485
- |luminosity  = 21
+ |axis        = 0.6474
+ |inclination = 92.17
- |temperature = approx 6000
- |metal_fe    = -0.02 ± 0.08
+ |node        = 105.15
+ |periastron  = 1920.37
+ |eccentricity= 0.705
+ |periarg     = 340.19
+}}
+<!-- {{Starbox detail
+ |mass        =
+ |radius      =
+ |luminosity  =
+ |temperature =
+ |metal_fe    =
  |gravity     =
  |rotational_velocity=
- |age_byr     = 2.5
+ |age_gyr     =
-}}
+}} -->
 {{Starbox catalog
- |names = 1 Equulei, [[Henry Draper catalog|HD]] 199766, [[Hipparcos catalog|HIP]] 103569, [[Bright Star Catalog|HR]] 8034, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 126428, BD+03°4473AB
+ |names = 1 Equulei, [[Henry Draper catalog|HD]] 199766, [[Hipparcos catalog|HIP]] 103569, [[Bright Star Catalog|HR]] 8034, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 126428, [[Bonner Durchmusterung|BD]]+03° 4473
 }}
 {{Starbox reference
-|Simbad=eps+Equ
+ |Simbad = eps+Equ
 }}
 {{Starbox end}}
-'''Epsilon Equulei''' (ε Equulei, ε Equ) is a star system of apparent magnitude +5.23 in the constellation of Equuleus . It is located 176 light years away from the Solar System .
+'''Epsilon Equulei''' (ε Equulei, ε Equ) is a star system of apparent magnitude +5.23<ref name=SIMBAD/> in the constellation of Equuleus . It is located 176 light years away from the Solar System.
 == Components A and B ==
@@ Line 62: / Line 70: @@
 ==References==
-{{Reflist|refs=
+{{Reflist}}
-<ref name=wolframalpha>{{citation | title=Epsilon Equulei | work=Wolfram Alpha | url=http://www.wolframalpha.com/input/?i=Epsilon+Equulei | accessdate=2012-08-18 }}</ref>
-}}
-==External links==
-*[http://www.astrostudio.org/xhip.php?hip=103569/ Astrostudio.org]{{dead link|date=March 2017}}
-This article is based on the Spanish version.
 {{Stars of Equuleus}}
@@ Line 77: / Line 78: @@
 [[Category:Flamsteed objects|Equulei, 01]]
 [[Category:Bayer objects|Equulei, Epsilon]]
-[[Category:Hipparcos objects|103569]]
 [[Category:F-type giants]]
 [[Category:F-type subgiants]]
 [[Category:G-type main-sequence stars]]
+[[Category:Durchmusterung objects]]
+[[Category:Hipparcos objects|103569]]
 [[Category:Henry Draper Catalogue objects|199766]]
 [[Category:HR objects|8034]]
-[[Category:Durchmusterung objects]]

Observation data Epoch J2000 Equinox J2000
Constellation	Equuleus
Right ascension	20^h 59^m 04.47539^s^[1]
Declination	04° 17′ 36.5211″^[1]
Apparent magnitude (V)	5.23^[2] (5.96 / 6.31)^[3]
Characteristics
Spectral type	F5III.../F5IV/G0V/?
U−B color index	+0.00^[4]
B−V color index	+0.47^[4]
Astrometry

Radial velocity (R_v)	8.20 ± 0.2^[5] km/s
Proper motion (μ)	RA: -115.75^[1] mas/yr Dec.: -151.70^[1] mas/yr
Parallax (π)	18.49 ± 1.35 mas^[1]
Distance	180 ± 10 ly (54 ± 4 pc)

Orbit^[3]
Period (P)	101.485 yr
Semi-major axis (a)	0.6474″
Eccentricity (e)	0.705
Inclination (i)	92.17°
Longitude of the node (Ω)	105.15°
Periastron epoch (T)	1920.37
Argument of periastron (ω) (secondary)	340.19°
Other designations
1 Equulei, HD 199766, HIP 103569, HR 8034, SAO 126428, BD+03° 4473
Database references
SIMBAD	data