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tau1 Capricorni

{{short description|Star in the constellation Capricornus}}

{{DISPLAYTITLE:Tau1 Capricorni}}

{{other stars by Bayer designation|Tau Capricorni{{!}}τ Capricorni}}

{{Starbox begin

| name = τ1 Capricorni

}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Capricornus

| ra={{RA|20|37|21.20}}

| dec={{DEC|-15|08|50.4}}

| appmag_v = +6.76

}}

{{Starbox character

| class=K1 III

| b-v = +1.26

| u-b = +1.23

}}

{{Starbox astrometry

| radial_v = 18.5 ± 3

| prop_mo_ra=61.508

| prop_mo_dec=−47.081

| parallax=4.3504

| p_error=0.0229

| parallax_footnote=

| dist_ly=

| dist_pc=

| absmag_v= −0.27

}}

{{Starbox detail

| mass=1.18

| temperature=4,272

| luminosity=191

| radius=25

| gravity=1.81

| metal_fe=−0.02

}}

{{Starbox catalog

| names = {{odlist |F=13 Capricorni|HD = 196348|BD = −15°5732|HIP = 101751|SAO = 163740|GC = 28694|B = τ1 Cap|Gould = 34 G. Capricorni}}

}}

{{Starbox reference

| Simbad = 13+Cap

}}

{{Starbox end}}

Tau1 Capricorni (τ1 Cap, τ1 Capricorni) is a star in the constellation Capricornus. It has an apparent magnitude of 6.76, making it readily visible in binoculars, but not to the naked eye. Located approximately 750 light years from Earth, the star is receding with a heliocentric radial velocity of {{val|18.5|ul=km/s}}. Due to its location near the ecliptic, τ1 Cap can be occulted by the Moon and rarely planets.

τ1 Capricorni has a stellar classification of K1 III, indicating that it is an ageing K-type giant. At present it has 118% the mass of the Sun and an enlarged radius of {{val|25|ul=solar radii}}. It shines at 191 times the luminosity of the Sun from its photosphere at an effective temperature of {{val|4,272|ul=K}}. τ1 Cap's metallicity – elements heavier than helium – is at solar level.

References

{{reflist|refs=

{{cite Gaia EDR3|6863379630459560832}}

{{cite journal

| 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 }}

{{cite journal |bibcode=2019A&A...628A..94A |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. |last5=Santiago |first5=B. X. |last6=Jordi |first6=C. |last7=Girardi |first7=L. |last8=Brown |first8=A. G. A. |last9=Matijevič |first9=G. |last10=Monari |first10=G. |last11=Cantat-Gaudin |first11=T. |last12=Weiler |first12=M. |last13=Khan |first13=S. |last14=Miglio |first14=A. |last15=Carrillo |first15=I. |last16=Romero-Gómez |first16=M. |last17=Minchev |first17=I. |last18=De Jong |first18=R. S. |last19=Antoja |first19=T. |last20=Ramos |first20=P. |last21=Steinmetz |first21=M. |last22=Enke |first22=H. |journal=Astronomy and Astrophysics |volume=628 |pages=A94 |year=2019 |arxiv=1904.11302 |doi=10.1051/0004-6361/201935765 |s2cid = 131780028}}

{{cite journal|display-authors=1 |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Pepper |first3=Joshua |last4=Paegert |first4=Martin |last5=De Lee |first5=Nathan |last6=Torres |first6=Guillermo |last7=Latham |first7=David W. |last8=Charpinet |first8=Stéphane |last9=Dressing |first9=Courtney D. |last10=Huber |first10=Daniel |last11=Kane |first11=Stephen R. |last12=Lépine |first12=Sébastien |last13=Mann |first13=Andrew |last14=Muirhead |first14=Philip S. |last15=Rojas-Ayala |first15=Bárbara |last16=Silvotti |first16=Roberto |last17=Fleming |first17=Scott W. |last18=Levine |first18=Al |last19=Plavchan |first19=Peter |title=The TESS Input Catalog and Candidate Target List |journal=The Astronomical Journal |date=September 2018 |volume=156 |issue=3 |pages=102 |doi=10.3847/1538-3881/aad050 |arxiv=1706.00495 |bibcode=2018AJ....156..102S |s2cid=73582386 |issn=0004-6256 |doi-access=free }}

{{cite book |last1=Houk |first1=N. |last2=Smith-Moore |first2=M. |title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. |date=1988 |volume=4 |bibcode=1988mcts.book.....H}}

{{cite journal |last1=Radick |first1=R. |last2=Lien |first2=D. |title=Illinois occultation summary. I - 1977-1978 |journal=The Astronomical Journal |date=August 1980 |volume=85 |pages=1053 |doi=10.1086/112767 |issn=0004-6256 |bibcode=1980AJ.....85.1053R |doi-access=free}}

{{cite journal |last1=Mermilliod |first1=J. -C. |title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) |journal=Catalogue of Eggen's UBV Data |date=1986 |pages=0 |bibcode=1986EgUBV........0M}}

{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}

}}

{{Stars of Capricornus}}

{{DEFAULTSORT:Tau1 Capricorni}}

Capricorni, Tau1

Category:Capricornus

Category:K-type giants

Capricorni, 13

101751

196348

Category:Durchmusterung objects