HD 68402

{{Short description|Star in the constellation Volans with a planet}}

{{Starbox begin

| name = HD 68402

}}

{{Starbox observe

| constell = Volans

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| ra = {{RA|08|05|23.69129}}

| dec = {{DEC|-74|24|37.4873}}

| appmag_v = 9.09 ± 0.02

}}

{{Starbox character

| class = G5 IV/V

| b-v = +0.68

}}

{{Starbox astrometry

| radial_v = 11.60 ± 0.49

| prop_mo_ra = −78.195

| prop_mo_dec = +78.973

| pm_footnote =

| parallax = 12.7204

| p_error = 0.0101

| parallax_footnote =

| absmag_v = +4.66

}}

{{Starbox detail

| source =

| mass = 1.12 ± 0.05

| radius = 1.02 ± 0.05

| luminosity = {{val|1.17|0.06|0.07}}

| gravity = 4.43 ± 0.04

| temperature = 5,907 ± 68

| metal_fe = +0.29 ± 0.10

| rotational_velocity = 2.9 ± 0.2

| age_gyr = 1 ± 0.9

}}

{{Starbox catalog

| names = {{odlist|HD = 68402|CD = −74°392|CPD = −74°486|HIP = 39589}}

}}

{{Starbox reference

| Simbad = HD+68402

| EPE = HD+68402

| NSTED = HD 68402

}}

HD 68402 is a solitary star located in the circumpolar constellation Volans. With an apparent magnitude of 9.09, it is invisible to the naked eye but can be seen with an amateur telescope. This star is located at a distance of 256 light years based on its parallax shift but is drifting away at a rate of 11.60 km/s.

HD 68402 has a classification of G5 IV/V, which indicates that it is a G5 star with the characteristics of a subgiant and main-sequence star. Contrary to its classification, it is actually a G1 dwarf. At present it is slightly more massive than the Sun and has a similar radius to the latter. It radiates at 1.17 times the luminosity of the Sun from its photosphere at an effective temperature of 5,907 K, which gives it a yellow hue. At an age of 1 billion years HD 68402 has a projected rotational velocity of almost 3 km/s and is metal rich like most planetary hosts (1.94 times to be exact).

Planetary system

In 2017, a superjovian planet was discovered using doppler spectroscopy data from HARPS and CORALIE. In 2023, the inclination and true mass of HD 68402 b were determined via astrometry.

{{Orbitbox planet begin

| name = HD 68402

| table_ref =

| period_unit = year

}}

{{Orbitbox planet

| exoplanet = b

| mass = {{val|7.9|1.7|1.5}}

| semimajor = {{val|2.239|0.11|0.075}}

| eccentricity = {{val|0.225|0.15|0.082}}

| period = {{val|3.15|0.22|0.14}}

| inclination = {{val|20.3|6.2|4.1}} or {{val|159.7|4.1|6.2}}

}}

References

{{reflist||refs=

{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=1 March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}

{{cite book |last1=Houk |first1=N. |last2=Cowley |first2=A. P. |title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. |date=1 January 1975 |bibcode=1975mcts.book.....H |url=https://ui.adsabs.harvard.edu/abs/1975mcts.book.....H/abstract}}

{{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 |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971|s2cid=255204555 }}

{{cite journal |last1=Jenkins |first1=J. S. |last2=Jones |first2=H. R. A. |last3=Tuomi |first3=M. |last4=Díaz |first4=M. |last5=Cordero |first5=J. P. |last6=Aguayo |first6=A. |last7=Pantoja |first7=B. |last8=Arriagada |first8=P. |last9=Mahu |first9=R. |last10=Brahm |first10=R. |last11=Rojo |first11=P. |last12=Soto |first12=M. G. |last13=Ivanyuk |first13=O. |last14=Becerra Yoma |first14=N. |last15=Day-Jones |first15=A. C. |last16=Ruiz |first16=M. T. |last17=Pavlenko |first17=Y. V. |last18=Barnes |first18=J. R. |last19=Murgas |first19=F. |last20=Pinfield |first20=D. J. |last21=Jones |first21=M. I. |last22=López-Morales |first22=M. |last23=Shectman |first23=S. |last24=Butler |first24=R. P. |last25=Minniti |first25=D. |title=New planetary systems from the Calan–Hertfordshire Extrasolar Planet Search |journal=Monthly Notices of the Royal Astronomical Society |date=April 2017 |volume=466 |issue=1 |pages=443–473 |doi=10.1093/mnras/stw2811 |issn=0035-8711 |bibcode=2017MNRAS.466..443J |arxiv=1603.09391 |doi-access=free}}

{{cite journal |last1=Adibekyan |first1=V. |last2=Santos |first2=N. C. |last3=Demangeon |first3=O. D. S. |last4=Faria |first4=J. P. |last5=Barros |first5=S. C. C. |last6=Oshagh |first6=M. |last7=Figueira |first7=P. |last8=Delgado Mena |first8=E. |last9=Sousa |first9=S. G. |last10=Israelian |first10=G. |last11=Campante |first11=T. |last12=Hakobyan |first12=A. A. |title=Stellar clustering and orbital architecture of planetary systems |journal=Astronomy & Astrophysics |date=May 2021 |volume=649 |pages=A111 |doi=10.1051/0004-6361/202040201 |issn=0004-6361 |bibcode=2021A&A...649A.111A |arxiv=2102.12346|s2cid=233707059 }}

{{cite journal |last1=Xiao |first1=Guang-Yao |last2=Liu |first2=Yu-Juan |display-authors=etal |date=May 2023 |title=The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements |journal=Research in Astronomy and Astrophysics |volume=23 |issue=5 |pages=055022 |doi=10.1088/1674-4527/accb7e |arxiv=2303.12409 |bibcode=2023RAA....23e5022X|s2cid=257663647 }}

}}

Category:G-type main-sequence stars

Category:G-type subgiants

Category:Planetary systems with one confirmed planet