Eta Arietis

{{Starbox begin

| name = η 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=η Arietis

|x=756|y=424

}}

|caption=Location of η Arietis (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|02|12|48.086}}

| dec = {{DEC|+21|12|39.58}}

| appmag_v = 5.227{{±|0.023}}

| constell = Aries

}}

{{Starbox character

| class = F5 V

| b-v = +0.435

| u-b = –0.04{{cn|date=April 2025}}

| variable =

}}

{{Starbox astrometry

| radial_v = +5.38{{±|0.19}}

| prop_mo_ra = +163.917

| prop_mo_dec = +5.000

| pm_footnote =

| parallax = 33.3383

| p_error = 0.1196

| parallax_footnote =

| absmag_v = +2.93

}}

{{Starbox detail

| mass = 1.30{{±|0.19}}

| radius = 1.95{{±|0.08}}

| luminosity = 5.91{{±|0.23}}

| temperature = 6,443{{±|107}}

| gravity = 3.97{{±|0.08}}

| metal_fe = –0.35

| rotational_velocity = 9

| age_gyr = 2.6 Gyr
3.98

}}

{{Starbox catalog

| names = {{odlist | B=η Ari | F=17 Arietis | BD=+20 348 | GJ=1043 | HD=13555 | HIP=10306 | HR=646 | SAO=75204 | GC=2643 | PPM=91445 | TIC=306484795 }}

}}

{{Starbox reference

| Simbad=eta+Ari

}}

Eta Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from η Arietis, and abbreviated Eta Ari or η Ari. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.231. Based on an annual parallax shift of {{val|33.34|ul=mas}}, the distance to this star is {{Convert|98|ly|pc|abbr=out|lk=on}}. It is drifting further away from the Sun with a radial velocity of +5 km/s.

This is an ordinary F-type main-sequence star with a stellar classification of F5 V. It is younger than the Sun with an age of about 2.6 billion years, and is spinning with a projected rotational velocity of 9 km/s. This star has 1.3 times the mass of the Sun and double the Sun's radius. It is radiating 5.9 times the luminosity of the Sun from its photosphere at an effective temperature of the outer atmosphere is 6,443 K, giving it the yellow-white-hued glow of an F-type star. The abundance of elements more massive than helium in the stellar atmosphere is lower than in the Sun.

Eta Arietis was examined using the HARPS instrument for radial velocity variations that may be caused by an orbiting companion, but no signal was detected. Nor has an infrared excess been detected using the Spitzer Space Telescope, which might otherwise indicate the presence of circumstellar gas or dust.

References

{{reflist|refs=

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{{citation | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Peletier | first2=R. F. | last3=Sánchez-Blázquez | first3=P. | last4=Selam | first4=S. O. | last5=Toloba | first5=E. | last6=Cardiel | first6=N. | last7=Falcón-Barroso | first7=J. | first8=Gorgas | last8=J. | last9=Jiménez-Vicente | first9=J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=Monthly Notices of the Royal Astronomical Society | volume=374 | issue=2 | pages=664–690 |date=January 2007 | doi=10.1111/j.1365-2966.2006.11196.x | doi-access=free | bibcode=2007MNRAS.374..664C | arxiv=astro-ph/0611618 | s2cid=119428437 | postscript=.}}

{{citation | title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics | display-authors=1 | last1=Holmberg | first1=J. | last2=Nordström | first2=B. | last3=Andersen | first3=J. | journal=Astronomy and Astrophysics | volume=501 | issue=3 | pages=941–947 |date=July 2009 | doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H | arxiv=0811.3982 | s2cid=118577511 | postscript=.}}

{{citation | display-authors=1 | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Kambe | first3=Eiji | last4=Masuda | first4=Seiji | last5=Izumiura | first5=Hideyuki | last6=Watanabe | first6=Etsuji | last7=Ohkubo | first7=Michiko | last8=Yanagisawa | first8=Kenshi | last9=Yasaka | first9=Yoshiro | title=High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards | journal=Publications of the Astronomical Society of Japan | volume=57 | issue=1 | pages=13–25 |date=February 2005 | bibcode=2005PASJ...57...13T | postscript=. | doi=10.1093/pasj/57.1.13| doi-access=free}}

{{citation | display-authors=1 | last1=Lagrange | first1=A.-M. | last2=Desort | first2=M. | last3=Galland | first3=F. | last4=Udry | first4=S. | last5=Mayor | first5=M. | title=Extrasolar planets and brown dwarfs around A-F type stars. VI. High precision RV survey of early type dwarfs with HARPS | journal=Astronomy and Astrophysics | volume=495 | issue=1 | pages=335–352 |date=February 2009 | doi=10.1051/0004-6361:200810105 | bibcode=2009A&A...495..335L | arxiv=0809.4636 | s2cid=62894956 | postscript=.}}

{{citation | display-authors=1 | last1=Trilling | first1=D. E. | last2=Bryden | first2=G. | last3=Beichman | first3=C. A. | last4=Rieke | first4=G. H. | last5=Su | first5=K. Y. L. | last6=Stansberry | first6=J. A. | last7=Blaylock | first7=M. | last8=Stapelfeldt | first8=K. R. | last9=Beeman | first9=J. W. | last10=Haller | first10=E. E. | title=Debris Disks around Sun-like Stars | journal=The Astrophysical Journal | volume=674 | issue=2 | pages=1086–1105 |date=February 2008 | doi=10.1086/525514 | bibcode=2008ApJ...674.1086T | arxiv=0710.5498 | s2cid=54940779 | postscript=.}}

{{citation | postscript=.

| title=The Revised TESS Input Catalog and Candidate Target List

| display-authors=1 | last1=Stassun | first1=Keivan G.

| last2=Oelkers | first2=Ryan J. | last3=Paegert | first3=Martin

| last4=Torres | first4=Guillermo | last5=Pepper | first5=Joshua

| last6=Lee | first6=Nathan De | last7=Collins | first7=Kevin

| last8=Latham | first8=David W. | last9=Muirhead | first9=Philip S.

| last10=Chittidi | first10=Jay | last11=Rojas-Ayala | first11=Bárbara

| last12=Fleming | first12=Scott W. | last13=Rose | first13=Mark E.

| last14=Tenenbaum | first14=Peter | last15=Ting | first15=Eric B.

| journal=The Astronomical Journal | language=en

| volume=158 | issue=4 | pages=138 | date=September 2019

| doi=10.3847/1538-3881/ab3467 | doi-access=free

| arxiv=1905.10694 | bibcode=2019AJ....158..138S

| issn=1538-3881}} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ6818e0e52c4349&-out.add=.&-source=IV/38/tic&-c=033.20035699556%20%2b21.21099376748,eq=J2000,rs=2&-out.orig=o eta Arietis' database entry] at VizieR.

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=02+12+48.0855%2B21+12+39.575&ident=*+eta+Ari&submit=Aladin+previewer Aladin previewer]
[http://aladin.u-strasbg.fr/java/nph-aladin.pl?script=get+Aladin+*+eta+Ari+11arcmin%3Bget+simbad+*+eta+Ari+11arcmin&from=Simbad4&submit=Aladin+applet Aladin sky atlas]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%20646 HR 646]

Category:F-type main-sequence stars

Category:Aries (constellation)