17 Delphini

{{Starbox begin

| name = 17 Delphini

}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Delphinus

| ra = {{RA|20|55|36.689}}

| dec = {{DEC|+13|43|17.531}}

| appmag_v = 5.18(5.16-5.27)

}}

{{Starbox character

| class = K0 III

| b-v = +1.13

| u-b = +0.95

| variable = suspected

}}

{{Starbox astrometry

| radial_v = −10.2{{±|0.9}}

| parallax = 6.3132

| p_error = 0.0699

| prop_mo_ra = +16.457

| prop_mo_dec = −11.468

| parallax_footnote =

| pm_footnote =

| absmag_v = −0.64

}}

{{Starbox detail

| source =

| mass = 2.33

| radius = 23.36

| luminosity = 219

| gravity = 2.07

| metal_fe = −0.19

| temperature = 4,616

| rotational_velocity = 3{{±|1}}

| age_myr = 832

}}

{{Starbox catalog

| names = {{odlist|F = 17 Del|HD = 199253|HIP = 103294|HR = 8011|AG = +13°2209|BD = +13°4572|FK5 = 3669|GC = 29201|SAO = 106665}}

}}

{{Starbox reference

| Simbad = 17+Del

}}

17 Delphini is a solitary star in the equatorial constellation Delphinus. It has an absolute magnitude of −0.64 and apparent magnitude of 5.18, allowing it to be faintly seen with the naked eye. Located 517 light years away, it is approaching the Solar System with a heliocentric radial velocity of {{val|-10.2|ul=km/s}}.

17 Delphini is an orange giant that is most likely on the horizontal branch (84% probability). At present it has 2.33 times the mass of the Sun, but at an age of 832 million years — has expanded to 23.36 times the radius of the Sun. It shines at {{val|219|ul=solar luminosities}} from its enlarged photosphere at an effective temperature of 4,616 K, giving it an orange glow. 17 Del has an iron abundance 64% that of the Sun and spins modestly with a projected rotational velocity of {{val|3|ul=km/s}}.

17 Del is suspected to be a variable star of unknown type ranging from 5.16 to 5.27.

References

{{reflist||refs=

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{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971|s2cid=119257644 }}

{{cite journal |last1=Stock |first1=Stephan |last2=Reffert |first2=Sabine |last3=Quirrenbach |first3=Andreas |title=Precise radial velocities of giant stars: X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search |journal=Astronomy & Astrophysics |date=August 2018 |volume=616 |pages=A33 |doi=10.1051/0004-6361/201833111 |issn=0004-6361 |bibcode=2018A&A...616A..33S |doi-access=free |arxiv=1805.04094}}

{{cite journal |last1=de Medeiros |first1=J. R. |last2=Mayor |first2=M. |title=A catalog of rotational and radial velocities for evolved stars |journal=Astronomy and Astrophysics Supplement Series |date=November 1999 |volume=139 |issue=3 |pages=433–460 |doi=10.1051/aas:1999401 |issn=0365-0138 |bibcode=1999A&AS..139..433D |doi-access=free}}

{{cite journal |last1=Hekker |first1=S. |last2=Meléndez |first2=J. |title=Precise radial velocities of giant stars: III. Spectroscopic stellar parameters |journal=Astronomy & Astrophysics |date=December 2007 |volume=475 |issue=3 |pages=1003–1009 |doi=10.1051/0004-6361:20078233 |issn=0004-6361 |bibcode=2007A&A...475.1003H |arxiv=0709.1145 |doi-access=free }}

{{cite journal | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 |doi-access=free}}

}}

Category:Delphinus

Category:K-type giants

Category:Suspected variables

BD+13 4572