HD 70642
{{Short description|Star in the constellation Puppis}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000.0
| constell = Puppis
| dec = {{DEC|−39|42|19.4843}}
}}
{{Starbox character
| type =
| r-i =
| v-r =
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{val|+49.31|0.12}}
| prop_mo_ra = {{val|−201.729}}
| prop_mo_dec = {{val|225.102}}
| parallax = 34.1478
| p_error = 0.0154
}}
{{Starbox detail
| luminosity = {{val|0.917|0.004}}
| temperature = {{val|5732|23}}
| metal_fe = {{val|+0.17|0.04}}
| rotation =
| age_gyr = {{val|1.9|1.1|u=Gyr}}
{{val|3.8|2.6}}
}}
{{Starbox catalog
| names = {{odlist | CD=−39°4247 | LTT=3116 | HD=70642 | HIP=40952 | GJ=304 | SAO=199126 }}
}}
{{Starbox reference
| Simbad = HD+70642
| NSTED = HD+70642
| ARICNS = 00626
| EPE = HD+70642
}}
{{Starbox end}}
HD 70642 is a star with an exoplanetary companion in the southern constellation of Puppis. It has an apparent visual magnitude of +7.17, which is too dim to be readily visible to the naked eye. The system is located at a distance of {{convert|95.5|ly|pc|lk=on|abbr=off}} from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +49.3 km/s. It came to within {{convert|16.96|pc|ly|disp=out|abbr=on}} of the Solar System some 329,000 years ago.
This may be considered to be a solar analog star, being similar in physical properties to the Sun. It is a G-type main-sequence star with a stellar classification of G6V CN+0.5. It is comparable to the age of the Sun, estimated to be in the range of 2–6 billion years old. Although chromospherically inactive a magnetic field has been detected. This star has about the same mass and radius as the Sun, is slightly cooler and less luminous, and is richer in abundance of iron relative to hydrogen. It is spinning at a leisurely rate, showing a projected rotational velocity of 1.6 km/s.
Planetary system
A long period planetary companion to HD 70642 was announced in 2003. This planet orbits in a circular orbit (e=0.034) at 3.232 AU. HD 70642 itself is similar enough to the sun that its habitable zone is at around the same distance(0.9-1.3 AU). HD 70642 b is thought to be compatible with potential Earth-mass planets at 1 AU. Because of this the HD 70642 system may be similar in structure to our own. In 2023, the inclination and true mass of HD 70642 b were determined via astrometry.
{{OrbitboxPlanet begin
| period_unit = year
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = {{val|3.9|0.29|0.27}}
| semimajor = {{val|3.295|0.021}}
| period = {{val|5.751|0.038|0.035}}
| eccentricity = {{val|0.04|0.034|0.027}}
| inclination = {{val|29.9|2.6|2.4}} or {{val|150.1|2.4|2.6}}
}}
{{Orbitbox end}}
See also
References
{{Reflist|refs=
{{Cite Gaia DR3|5540006949934104448}}
{{cite simbad | title=HD 70642 | access-date=2020-09-04 }}
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| title=XHIP: An extended hipparcos compilation
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| title=Revising the ages of planet-hosting stars
| last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.
| last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.
| display-authors=1 | journal=Astronomy and Astrophysics
| year=2015 | volume=575 | at=A18
| arxiv=1411.4302 | bibcode=2015A&A...575A..18B | bibcode-access=free
| doi=10.1051/0004-6361/201424951 | doi-access=free }}
| title=A Planet in a Circular Orbit with a 6 Year Period
| last1=Carter | first1=Brad D. | last2=Butler | first2=R. Paul
| last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A.
| last5=Marcy | first5=Geoffrey W. | last6=McCarthy | first6=Chris
| last7=Fischer | first7=Debra A. | last8=Penny | first8=Alan J.
| display-authors=1 | journal=The Astrophysical Journal Letters
| date=2003 | volume=593 | issue=1 | pages=L43–L46
| arxiv=astro-ph/0307066 | bibcode=2003ApJ...593L..43C
| bibcode-access=free | doi=10.1086/378185 | doi-access=free }}
| last1=Hinse | first1=T. C. | last2=Michelson | first2=R.
| last3=Jørgensen | first3=U. G. | last4=Goździewski | first4=K.
| last5=Mikkola | first5=S. | display-authors=1
| title=Dynamics and stability of telluric planets within the habitable zone of extrasolar planetary systems - Numerical simulations of test particles within the HD 4208 and HD 70642 systems
| journal=Astronomy & Astrophysics
| volume=488 | issue=3 | pages=1133–1147 | date=2008
| doi=10.1051/0004-6361:200809822 | doi-access=free
| bibcode=2008A&A...488.1133H }}
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
| display-authors=1 | journal=The Astronomical Journal
| volume=132 | issue=1 | pages=161–170 | date=July 2006
| doi=10.1086/504637 | bibcode=2006AJ....132..161G
| arxiv=astro-ph/0603770 | s2cid=119476992 }}
| title=Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur
| display-authors=1 | last1=Costa Silva | first1=A. R.
| last2=Delgado Mena | first2=E. | last3=Tsantaki | first3=M.
| journal=Astronomy & Astrophysics
| volume=634 | id=A136 | pages=10 | date=February 2020
| doi=10.1051/0004-6361/201936523 | arxiv=1912.08659
| bibcode=2020A&A...634A.136C | s2cid=209405391 }}
| title=Detection of a magnetic field in three old and inactive solar-like planet-hosting stars
| display-authors=1 | last1=Fossati | first1=L.
| last2=Kochukhov | first2=O. | last3=Jenkins | first3=J. S.
| last4=Stancliffe | first4=R. J. | last5=Haswell | first5=C. A.
| last6=Elmasli | first6=A. | last7=Nickson | first7=E.
| journal=Astronomy & Astrophysics
| volume=551 | id=A85 | pages=4 | date=March 2013
| doi=10.1051/0004-6361/201220997 | arxiv=1302.0879
| bibcode=2013A&A...551A..85F | s2cid=53377473 }}
{{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}}
}}
External links
- [http://www.solstation.com/stars2/hd70642.htm Solstation: HD 70642 / CD-39 4247]
{{Sky|08|21|28.1361|-|39|42|19.474|93.8}}
{{Stars of Puppis}}
{{DEFAULTSORT:HD 70642}}
Category:G-type main-sequence stars